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Do you have a question about the PX 8 and is the answer not in the manual?

Questions and answers

Anthony Lake
January 17, 2025

Valve adjustment on px8

User image 678ad99d154f2
Gerald Frye
February 27, 2025

WHAT CAN CAUSE A PX8 T0 HAVE 80 T0 95PSI OIL PRESSURE. OIL & FILTER HAS BEEN CHANGED PRESSURE RELIEF VALVE HAS BEEN CHANGED AND PLUNGER & SPRING ON BOTTOM OF OIL COOLER HAS BEEN CHANGED

Summary of Contents for Paccar PX 8

  • Page 3 Operator’s Manual Y53-1030A 12/09...
  • Page 4 PACCAR reserves the right to discontinue, change specifications, or change the design of its vehicles at any time without notice and without incurring any obligation. The information contained in this manual is proprietary to PACCAR. Reproduction, in whole or in part, by any means is strictly prohibited without prior written authorization from PACCAR Inc.
  • Page 5: Paccar

    The information, specifications, and recommended maintenance guidelines in this manual are based on information in effect at the time of printing. PACCAR Inc reserves the right to make changes at any time without obligation. If you find differences between your engine and the information in this manual, contact your local PACCAR Authorized Repair Location or write to PACCAR Inc c/o Medium Duty Engines, PO Box 1518, Bellevue, WA 98009.
  • Page 6 Foreword...
  • Page 7: Table Of Contents

    Maintenance Record Form ..... PACCAR Engine Nomenclature ....12...
  • Page 8 On-Highway ......PACCAR PX-8 Engine United States and California Emissions Components Statement for the PX-8 Canada Coverage .
  • Page 9: Introduction

    CAUTION This symbol and word signals something that could damage your vehicle. Example: CAUTION: Continuing to operate your vehicle with insufficient oil pressure will cause serious engine damage. PACCAR Y53-1030A 12/09 – 3 –...
  • Page 10: Illustrations

    Useful information. dition. The illustrations are intended to show repair or replacement procedures. The procedure will be the same for all applica- tions, although the illustration can differ. Y53-1030A 12/09 PACCAR – 4 –...
  • Page 11: General Safety Instructions

    Do not check for pressure leaks with your jewelry when working. hand. High pressure oil or fuel can cause personal injury. • Disconnect the battery (negative [-] cable first) and dis- charge any capacitors before beginning any repair work. PACCAR Y53-1030A 12/09 – 5 –...
  • Page 12 [50 lb] or more. Make sure all lifting devices such as any service work. Use ONLY genuine replacement parts chains, hooks, or slings are in good condition and are of from PACCAR. the correct capacity. Make sure hooks are positioned • Always use the same fastener part number (or equiva- correctly.
  • Page 13 Fluid is ingested, contact a physician immediately. • The catalyst substrate contains Vanadium Pentoxide. Vanadium Pentoxide has been determined by the State of California to cause cancer. Always wear protective gloves and eye protection when handling the catalyst PACCAR Y53-1030A 12/09 – 7 –...
  • Page 14: Acronyms And Abbreviations

    Control Parts List km/l Kilometers per Liter Centistokes Kilopascal Diesel Exhaust Fluid Low Temperature Aftercooling Diesel Particulate Filter Megapascal Electronic Control Module Miles Per Hour Exhaust Gas Recirculation Miles Per Quart Extended Life Coolant Y53-1030A 12/09 PACCAR – 8 –...
  • Page 15 Pounds Per Square Inch Power Takeoff Rear Gear Train Revolutions Per Minute Society of Automotive Engineers Supplemental Coolant Additive Selective Catalytic Reduction Step Timing Control Subsystem Identification Descriptions Variable Geometry Turbocharger Variable Speed Vehicle Speed Sensor PACCAR Y53-1030A 12/09 – 9 –...
  • Page 16 Introduction Y53-1030A 12/09 PACCAR – 10 –...
  • Page 17: Engine Identification

    Engine Dataplate The dataplate is located on the top side of the gear housing. Have the following engine data available when communicat- ing with a PACCAR Authorized Repair Location: • Engine serial number (ESN). • Control parts list (CPL). The engine dataplate provides important facts about the •...
  • Page 18: Paccar Engine Nomenclature

    If the engine dataplate (1) is not readable, the ESN (2) can be found on the engine block on top of the lubricating oil cooler The PACCAR engine nomenclature provides the engine housing. Additional engine information is on the electronic model and horsepower rating.
  • Page 19: Operating Instructions

    Follow the daily maintenance checks listed in “Maintenance Schedule” on page 45. The new PACCAR engine associated with this manual does not require a ”break-in” procedure. This section of the manual provides all of the necessary information required for proper engine operation.
  • Page 20 AND OPERATOR TO OPERATE THE VEHICLE IN A SAFE ENVIRONMENT. NOTE: Numerous safety devices (ie engine shutoff devices) are available to minimize the risk of engine overspeeding caused by combustible vapors being ingested into the air intake system. Y53-1030A 12/09 PACCAR – 14 –...
  • Page 21: Normal Starting Procedure

    With the accelerator pedal in the idle position, turn the key switch to the ON position. PACCAR recommends the installation of an air intake shutoff device or a similar safety device to minimize the risk of overspeeding, as can occur when the vehicle, is being operated in a combustible environment, such as from a fuel spill or gas leak.
  • Page 22 3. Diesel Particulate Filter (DPF) status indicator; amber in color. 4. High Exhaust System Temperature (HEST); amber in color. Under cold conditions, the Wait-to-Start lamp will illuminate at key on, and will stay on for a period of up to 30 seconds. Y53-1030A 12/09 PACCAR – 16 –...
  • Page 23 This should be considered an emergency. Oper- ating the engine in this condition may cause severe engine damage. You should stop the vehicle as safely as possible. The vehicle must be serviced and the problem corrected before driving again. PACCAR Y53-1030A 12/09 – 17 –...
  • Page 24 To bring the engine back to low idle speed: • For vehicles equipped with a manual transmission and clutch switch: Depress the clutch pedal. • For vehicles equipped with a brake switch: Depress the service brake pedal. • Depress the accelerator pedal. Y53-1030A 12/09 PACCAR – 18 –...
  • Page 25: Cold Weather Starting

    Operating Instructions Cold Weather Starting For more information on the Fast Idle Warm Up feature, contact a PACCAR authorized repair location. General Information Follow the Normal Starting Procedure in this section. If equipped with an intake air heater, the Wait-To-Start lamp will stay on longer.
  • Page 26: Starting Procedure After Extended Shutdown Or Oil Change

    This engine is equipped with an intake grid heater to help Normal start the engine in cold weather conditions. Contact your authorized PACCAR repair location for other cold weather Monitor the oil pressure and coolant temperature gauges starting aid options.
  • Page 27 If the engine temperature does not return to normal, shut off the engine, and refer to Troubleshooting Symptoms, or contact a PACCAR Authorized Repair Location. PACCAR Y53-1030A 12/09 – 21 –...
  • Page 28 • Monitor the engine temperature. After the temper- ature returns to normal, allow the engine to idle 3 to 5 minutes before shutting it off. This allows the engine to cool gradually and uniformly. Y53-1030A 12/09 PACCAR – 22 –...
  • Page 29 Some changes to look for are: • Engine misfires. • Vibration. • Unusual engine noises. • Sudden changes in engine operating temperatures or pressures. • Excessive smoke. Y53-1030A 12/09 PACCAR – 23 –...
  • Page 30: Cold Weather

    An idle shutdown feature, available on The cooling system in your vehicle was factory filled with PACCAR Engines, can be programmed to shut the Extended Life Coolant (ELC) that meets or exceeds all engine down after a period of low idle speed operation ASTM D 6210 requirements.
  • Page 31: Lubricating Recommentations And Specifications

    (grid heater) needs to warm the intake air prior to starting the engine. The WAIT TO START lamp on time will vary depending on the ambient air temperature. See “Normal Starting Procedure” on page 15 PACCAR Y53-1030A 12/09 – 25 –...
  • Page 32 The STOP ENGINE lamp is red in color, and can look like: but the vehicle can still be safely driven. Vehicle should be • The words STOP or STOP ENGINE spelled out Y53-1030A 12/09 PACCAR – 26 –...
  • Page 33: Operator's Manual

    Do not operate the engine at full throttle operation below peak torque rpm (refer to engine dataplate for peak torque rpm) for more than 30 seconds. PACCAR Y53-1030A 12/09 – 27 –...
  • Page 34: Engine Braking System

    Operating Instructions Engine Braking System PACCAR engines are designed to operate successfully at full throttle under transient conditions down to peak torque engine speed. This is consistent with recommended Variable Geometry Turbo (VGT) Brake System Gen- operating practices. eral Information...
  • Page 35 (VGT) exhaust brake quick or emergency stops. functions, refer to vehicle operation manual or contact a PACCAR Authorized Repair Location. WARNING! Do not use the exhaust brake when operating on surface with poor traction (such as WARNING! To reduce the possibility of personal wet, icy or snow covered roads).
  • Page 36 Use the engine and vehicle brak- ing systems to control engine speed. The optimum braking power of the engine (VGT) exhaust brake is reached at rated engine speed. Correct gear selection, therefore, is critical. Y53-1030A 12/09 PACCAR – 30 –...
  • Page 37 • A throttle sensor. With the ON/OFF switch in the ON position, the brake automatically creates its braking effect when you remove your foot from the accelerator pedal. PACCAR Y53-1030A 12/09 – 31 –...
  • Page 38 The two-position selector switch (standard) or three-position (optional) is located next to the on/off switch in the cab, and allows you to select the retarding power of one or two brakes. Y53-1030A 12/09 PACCAR – 32 –...
  • Page 39 • When cruise control is active and the Engine brakes in Cruise Control feature is turned off. • When engine speed goes below 850 rpm. • When the Engine Computer recognizes a system problem. PACCAR Y53-1030A 12/09 – 33 –...
  • Page 40 30°C [86°F]. Operation below 30°C [86°F] could cause severe damage to the engine. Idle the engine 3 to 5 min- utes at approximately 1000 rpm to warm the engine before activating the engine brakes. Y53-1030A 12/09 PACCAR – 34 –...
  • Page 41 850 rpm or when an electronic fault code is active. cle to a stop. Remember, service brakes will be required to bring the vehicle to a stop. PACCAR Y53-1030A 12/09 – 35 –...
  • Page 42: Tips For Operation On Level And Dry Pavement

    Do not operate the engine if the engine brake will not deactivate. If the engine brakes will not shut off, shut off the engine immediately, and contact a PACCAR Authorized Repair Location. Y53-1030A 12/09 PACCAR...
  • Page 43: Tips For Operation On Grades With Dry Pavement

    HI position. For operation on dry and relatively flat surfaces, when greater retarding power is not required, put the two-position selector switch in the LOW position. PACCAR Y53-1030A 12/09 – 37 –...
  • Page 44 The optimum braking power of the engine holding it back. brakes is reached at rated engine speed. Correct gear selection, therefore, is critical. The two-position selector switch can be used to vary braking power as road conditions change. Y53-1030A 12/09 PACCAR – 38 –...
  • Page 45 NOTE: The longer or steeper the hill, the more important it is to use your engine brakes. Make max- imum use of your engine brakes by gearing down and letting the engine brakes do the work. PACCAR Y53-1030A 12/09 – 39 –...
  • Page 46: Tips For Operation On Slick Roads

    When driving on slick roads, start with the on/off switch in the slippery surface. “OFF” position and the two-position selector switch in the LOW position. Y53-1030A 12/09 PACCAR – 40 –...
  • Page 47 LOW position and activate the engine brakes by switching the on/off switch to the ON position. PACCAR Y53-1030A 12/09 – 41 –...
  • Page 48: Engine Shutdown

    PACCAR electronic controlled fuel system. PACCAR is not liable for any performance problems with either the fuel system or the accessory due to EMI. EMI is not considered by PACCAR to be an engine failure and therefore is not warrantable. Engine Shutdown System EMI Susceptibility PACCAR’S electrical system design will protect your engine...
  • Page 49 • Obtain optimum antenna type and mounting arrangement for your application • Make sure your accessory equipment model is built for maximum filtering to reject incoming electromag- netic noise. PACCAR Y53-1030A 12/09 – 43 –...
  • Page 50 Operating Instructions Y53-1030A 12/09 PACCAR – 44 –...
  • Page 51: Maintenance Guidelines

    • Engine Lubrication Oil Level - Check/Correct frequent stops are made. Contact your local PACCAR Autho- To check engine oil level, park vehicle on level ground rized Repair Location for recommended maintenance inter- vals.
  • Page 52 • Fuel Filter, Spin on type replace • Never add 100% antifreeze to the cooling system. Always dilute antifreeze to the correct concentration • Lubricating Oil – Change based on freeze protection prior to adding it to the Y53-1030A 12/09 PACCAR – 46 –...
  • Page 53 Check • Coolant level • Aftertreatment Diesel Particulate Filter – Clean • Coolant protection • Complete Cleaning of filter using a DPF cleaning • Replace coolant filter machine • Replace filter if necessary PACCAR Y53-1030A 12/09 – 47 –...
  • Page 54 [240,000 mi], whichever occurs first. 4. Follow the manufacturers' recommended air cleaner, refrigerant compressor, and fan clutch. maintenance procedures for the starter, alter- 3.Reset valve lash, if needed, to nominal specifica- nator, batteries, electrical components, tions. Y53-1030A 12/09 PACCAR – 48 –...
  • Page 55 27,215 kg [60,000 lbs]. vehicle weight is greater than 27,215 kg [60,000 lbs]. Vehicle uses the severe-duty oil drain interval (A). Vehicle uses the normal-duty oil drain interval (B). PACCAR Y53-1030A 12/09 – 49 –...
  • Page 56 Higher than 25 mph average 19,000 12,000 PACCAR bases its oil drain specifications on duty cycle and Maintaining the correct oil and filter change interval is a vital oil contamination. This contamination occurs in all engines at factor in preserving the integrity of an engine. Filters must be varying rates regardless of design.
  • Page 57: Maintenance Record Form

    Maintenance Guidelines Maintenance Record Form Engine Serial No. Engine Model: Owner’s Name: Equipment Name/No. km (Miles), Hours, Actual km (Miles) Maintenance Check Performed Date Comments or Time Interval or Hours Check Performed PACCAR Y53-1030A 12/09 – 51 –...
  • Page 58 Maintenance Guidelines Y53-1030A 12/09 PACCAR – 52 –...
  • Page 59: Service Literature

    SERVICE LITERATURE Additional Service Literature General Information The following publications can be purchased from your authorized PACCAR Engine dealer. Bulletin Number Title of Publication 4022257 Engine Service Manual 4022225 Electronic Control System Troubleshooting and Repair Manual 2883353 Operation and Maintenance Manual...
  • Page 60 Service Literature Y53-1030A 12/09 PACCAR – 54 –...
  • Page 61: Maintenance Specifications

    788 kg (1,737 lb) Intake Valve Adjustment 0.305 mm (0.012 in.) Overhead Adjustment Exhaust Valve Adjustment 0.559 mm (0.022 in.) Engine Brake Adjustment 2.286 mm (0.090 in.) Maximum Overspeed Capability 3,600 rpm (15 seconds maximum) PACCAR Y53-1030A 12/09 – 55 –...
  • Page 62: Lubricating Oil System

    16.1 to 19.9 liters (17 to 21 qt) Total System Capacity (Oil Pan and New Oil Filter) Standard Oil Pan 22.7 liters (24 qt) Standard Oil Pan with Cylinder Block Stiffener Plate 23.7 liters (25 qt) Y53-1030A 12/09 PACCAR – 56 –...
  • Page 63: Cooling System

    Standard Modulating Thermostat Range 82 to 93°C (180 to 200°F) Minimum Recommended Pressure Cap 103 kPa (15 psi) Maxiumum Top Tank Coolant Temperature 107°C (225°F) Winterfronts Minimum Allowed Air Passage Area 774 cm² (120 in.²) PACCAR Y53-1030A 12/09 – 57 –...
  • Page 64: Filter Specifications

    Fuel Filter (primary, pressure side) PACCAR recommends their use. FF5636 Fleetguard Part Number Fleetguard products meet all PACCAR test standards to pro- Fuel Filter (secondary, suction side, with vide the quality filtration necessary to achieve the engine's water-in-fuel sensor) FS1065 design life.
  • Page 65: Diesel Exhaust Fluid Recommendations And Specifications

    Be sure you fol- with water. Agricultural grade urea does not low the fuel recommendations as indicated in meet the necessary specifications required and this section of the operator's manual. the aftertreatment system may be damaged. PACCAR Y53-1030A 12/09 – 59 –...
  • Page 66 0.0015 (15 ppm) mass percent sulfur content (ultra-low diesel fuel is also defined by ASTM 5-15). There are no acceptable substitutes. PACCAR recommends the use of ASTM number 2D fuel. The use of number 2 diesel fuel will result in optimum engine performance.
  • Page 67 This decrease in energy content equates roughly to the same percentage of power loss. Use of fuels with higher API gravity will cause higher than normal fuel consumption. NOTE: PACCAR recommends that the cetane num- NOTE: Using diesel fuel with a lower than recom-...
  • Page 68: Lubricating Oil Recommendations And Specifications

    Engine oil filters PACCAR Inc approves the use of biodiesel fuel blends up to capture dirt and remove deposits from the oil to 5% by volume in diesel fuel that meets all of the following prolong the life of internal moving components.
  • Page 69 Maintenance Specifications CES: Cummins Engineering Standard PACCAR allows, for midrange applications, the use of lubri- cating oils that meet or exceed CES 20078 or CES 20081 with no change in oil drain interval. But, if a non-low ash lubri- cating oil meeting the Cummins Engineering Standard (CES) classification CES 20078 is used, the service interval(s) for the aftertreatment system will be reduced.
  • Page 70 Petroleum Institute (API) performance classification heavy-duty engine oil. CJ-4/SL may not meet the CES 20081 requirement. The primary PACCAR recommendation is for the use of Always make sure the lubricating oil used meets the 15W-40 multigrade lubricating oil for normal operation at CES 20081 requirement in addition to the API per- ambient temperatures above -15°C [5°F].
  • Page 71 Obtain a commit- ment from the oil supplier that the oil will give satisfactory performance in PACCAR engines or do not use the oil. New Engine Break-In Oils Special “break-in” engine lubricating oils are not recom- mended for new or rebuilt PACCAR engines.
  • Page 72: Coolant Recommendations And Specifications

    Aftermarket Oil Additive Usage America. For extremely cold operating conditions, a 60/40 mixture (coolant/water ratio) can be used to provide freeze PACCAR does not recommend the use of aftermarket oil protection down to -62°F (-52.2°C). additives. The present high-quality fully additive engine lubri-...
  • Page 73 Maintenance Specifications Good-quality water is important for cooling system perfor- PACCAR recommends the use of fully formulated extended mance. Excessive levels of calcium and magnesium contrib- life coolant that meets the requirements of Cummins Engi- ute to scaling problems, and excessive levels of chlorides neering Standard (C.E.
  • Page 74 • Rocker lever housing gasket. • Lubricating oil cooler housing gasket. • Cylinder head gasket. • Thermostat housing gasket. For further details of engine coolant for PACCAR PX-8 engines, refer to Cummins Coolant Requirements and Main- tenance Bulletin 3666132. Checking Coolant Condition A refractometer must be used to measure the freezing point ®...
  • Page 75 Maintenance Specifications Recommended Extended Life Coolant Suppliers Brand Name Supplier Authorized PACCAR engine dealer CAUTION: Do not use a floating ball hydrometer. The use of floating ball hydrometers can give an incorrect reading. Using a floating ball hydrome- ter for testing the freezing point of the coolant is an inaccurate test and will cause a false reading of the coolant freezing point.
  • Page 76 • Buildup in coolant low-flow areas • Plug the radiator and oil cooler • Possibly damage the water pump seal. Failure to comply may result in equipment or property damage. Y53-1030A 12/09 PACCAR – 70 –...
  • Page 77 Soluble oils in the cooling system will: • Corrode brass and copper • Damage heat transfer surfaces • Damage seals and hoses. Failure to comply may result in equipment or property damage. PACCAR Y53-1030A 12/09 – 71 –...
  • Page 78 Maintenance Specifications Y53-1030A 12/09 PACCAR – 72 –...
  • Page 79: Warranty

    Engine removal and rein- purchaser by PACCAR. stallation when necessary to repair a Warrantable Failure. PACCAR will pay for the first year from the date of delivery of Base Engine Warranty the Engine to the first purchaser reasonable costs for towing...
  • Page 80 The Warrantable tations of the engine warranty begin running on the Date of Failure must be brought to the attention of a PACCAR autho- Delivery to the First Purchaser. The accrued time, mileage, rized engine dealer within 30 days of discovery.
  • Page 81 EXCEPT FOR THE ABOVE LIMITED WARRANTY, dards. PACCAR AND THE SELLING DEALER MAKE NO OTHER Failures of belts and hoses supplied by PACCAR are cov- WARRANTIES, EXPRESS OR IMPLIED. PACCAR AND ered for the first year from the date of delivery of the Engine THE SELLING DEALER EXPRESSLY DISCLAIM ANY to the first purchaser.
  • Page 82: United States And Canada Fire Apparatus Truck Applications Coverage

    This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. PACCAR Responsibilities PACCAR will pay for all parts and labor needed to repair the United States and Canada Fire Apparatus damage to the Engine resulting from a Warrantable Failure.
  • Page 83 The Warrantable Engine is limited to the repair or replacement of "warrantable Failure must be brought to the attention of a PACCAR autho- failures" at authorized United States and Canadian PACCAR rized engine dealer within 30 days of discovery. Except for...
  • Page 84 EXCEPT FOR THE ABOVE LIMITED WARRANTY, PACCAR AND THE SELLING DEALER MAKE NO OTHER Failures of belts and hoses supplied by PACCAR are not WARRANTIES, EXPRESS OR IMPLIED. PACCAR AND covered beyond the first year from the date of delivery of the THE SELLING DEALER EXPRESSLY DISCLAIM ANY Engine to the first purchaser.
  • Page 85: Emission Warranty

    Engine is designed, built and engine or vehicle replacement parts that are not equivalent to equipped so as to conform at the time of sale by PACCAR the PACCAR engine or OEM vehicle manufacturer's original with all U.S. Federal emission regulations applicable at the...
  • Page 86 WARRANTY MADE BY PACCAR RELATING TO THE authorized PACCAR Engine facility where applicable, sub- EMISSION EQUIPMENT. EXCEPT FOR THE ABOVE LIM- ject to PACCAR's time, mileage, and hour limitations of the ITED WARRANTY, PACCAR MAKES NO OTHER WAR- engine emission warranty. The maximum time, mileage and R A N T I E S , E X P R E S S O R I M P L I E D .
  • Page 87: California Emission Control System Warranty, On-Highway

    Where a Warrantable Condition exists, PACCAR will repair your engine at no cost to you including Your Warranty Rights and Obligations diagnosis, parts and labor.
  • Page 88: California Emissions Components Statement For The Px-8 Engine (2010) Emission Engine Coverage

    WARRANTY California Emissions Components As the engine owner, you should also be aware that PACCAR may deny you warranty coverage if your engine or Statement for the PX-8 Engine (2010) a part has failed due to abuse, neglect, improper mainte- Emission Engine Coverage nance or unapproved modifications.
  • Page 89 • Fuel Pump and Associated Plumbing Parts • Ambient Air Temperature Sensor • Wire harness circuits connected at both ends to emis- sions warrantable components Exhaust Gas Recirculation System • Compressor in Temperature/Pressure Sensor PACCAR Y53-1030A 12/09 – 83 –...
  • Page 90 Cummins Distributor using new or genuine approved rebuilt PACCAR recommends that any service parts used for main- parts and assemblies. PACCAR will repair any of the emis- tenance, repair or replacement of emission control systems sion control parts found by PACCAR to be defective without...
  • Page 91 Warranty Limitations approved parts. Your sole and exclusive remedy against PACCAR and the PACCAR is not responsible for the material and labor costs Selling Dealer arising from your purchase and use of this of emission control parts and assemblies replaced during Engine is limited to the repair or replacement of "warrantable...
  • Page 92 CLAIM ANY WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PUR- POSE. PACCAR AND THE SELLING DEALER SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAM- AGES INCLUDING, BUT NOT LIMITED TO: LOSS OF INCOME OR LOST PROFITS; ENGINE OR VEHICLE DOWNTIME;...

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