Coolant In Combustion Chamber; Coolant In Engine Oil - Suzuki XL7 2007 Service Manual

Seized or broken valve train components

Coolant in Combustion Chamber

DEFINITION: Excessive white smoke and/or coolant type odor coming from the exhaust pipe may indicate coolant in
the combustion chamber. Low coolant levels, an inoperative cooling fan, or a faulty thermostat may lead to an
"overtemperature" condition which may cause engine component damage.
1. A slower than normal cranking speed may indicate coolant entering the combustion chamber. Refer to "Engine
Will Not Crank - Crankshaft Will Not Rotate".
2. Remove the spark plugs and inspect for spark plugs saturated by coolant or coolant in the cylinder bore.
3. Inspect by performing a "Cylinder Leakage Test". During this test, excessive air bubbles within the coolant may
indicate a faulty gasket or damaged component.
4. Inspect by performing a cylinder compression test. Two cylinders "side-by-side" on the engine block, with low
compression, may indicate a failed cylinder head gasket. Refer to "Engine Compression Test".
Cracked intake manifold or failed gasket
Faulty cylinder head gasket
Warped cylinder head
Cracked cylinder head
Cracked cylinder liner or engine block
Cylinder head or engine block porosity

Coolant in Engine Oil

DEFINITION: Foamy or discolored oil or an engine oil "overfill" condition may indicate coolant entering the engine
crankcase. Low coolant levels, an inoperative cooling fan, or a faulty thermostat may lead to an "overtemperature"
condition which may cause engine component damage. Contaminated engine oil and oil filter should be changed.
1. Inspect the oil for excessive foaming or an overfill condition. Oil diluted by coolant may not properly lubricate the
crankshaft bearings and may lead to component damage. Refer to "Lower Engine Noise, Regardless of Engine
Speed".
2. Inspect by performing a "Cylinder Leakage Test". During this test, excessive air bubbles within the cooling system
may indicate a faulty gasket or damaged component.
3. Inspect by performing a cylinder compression test. Two cylinders "side-by-side" on the engine block with low
compression may indicate a failed cylinder head gasket. Refer to "Engine Compression Test".
Faulty external engine oil cooler
Faulty cylinder head gasket
Warped cylinder head
Cracked cylinder head
Cracked cylinder liner or engine block
Cylinder head, block, or manifold porosity
Cause
Cause
Cause
Correction
1. Inspect the followers, rocker arms.
2. Inspect the lifters.
3. Inspect the valves.
4. Inspect the valve springs.
5. Repair as required.
Correction
Replace the components as required.
Replace the head gasket and components as required.
Refer to "Cylinder Head Cleaning and Inspection" and
"Cylinder Head Replacement - Left Side" or "Cylinder
Head Replacement - Right Side".
Machine the cylinder head to the proper flatness, if
applicable and replace the cylinder head gasket. Refer to
"Cylinder Head Cleaning and Inspection".
Replace the cylinder head and gasket.
Replace the components as required.
Replace the components as required.
Correction
Replace the components as required.
Replace the head gasket and components as required.
Refer to "Cylinder Head Cleaning and Inspection" and
"Cylinder Head Replacement - Left Side" or "Cylinder
Head Replacement - Right Side".
Machine the cylinder head to proper flatness, if
applicable, and replace the cylinder head gasket. Refer to
"Cylinder Head Cleaning and Inspection".
Replace the cylinder head and gasket.
Replace the components as required.
Replace the components as required.
Engine Mechanical: 1D-33