Engine Lubrication; Service Precautions - Yamaha MM700A Manual

ENGINE
REAR

ENGINE LUBRICATION

The engine is lubricated by the oil injection system. Re-
fer to Chapter Seven for information concerning the oil in-
jection pump. Lubrication of a new or rebuilt engine or an
engine that has not been run for an extended time may be
initially supplemented by adding oil to the fuel used to
power the engine. Refer to Chapter Three for the engine
break-in procedure.

SERVICE PRECAUTIONS

Whenever working on the snowmobile, follow several
precautions to help with disassembly, inspection and reas-
sembly.
1. In the text there is frequent mention of the left or right
side of the engine. This refers to the engine as it is
mounted in the frame, not how it may sit on the work-
bench. See Figure 2.
2. Always replace a worn or damaged fastener with one
of the same size, type and torque requirements. Make sure
to identify each screw before replacing it with another.
Screw threads should be lubricated with engine oil, unless
otherwise specified, before torque is applied. If a tighten-
ing torque is not listed in Table 4 at the end of this chapter,
refer to the torque and fastener information in Chapter
One.
Use special tools where noted. In some cases, it may be
possible to perform the procedure with makeshift tools,
but this is not recommended. Using makeshift tools can
damage the components and may cause serious injury.
Where special snowmobile tools are required, they may
be purchased through any Yamaha dealership. Other tools
can be purchased through the dealership, from a motorcy-
cle store or from an auto parts store. When purchasing
tools from an auto parts store, remember that all threaded
parts that screw into the engine must have metric threads.
4. Before removing the first screw or nut, get a number of
boxes, plastic bags and containers (Figure 3). Use these
containers to separate and organize the parts while remov-
ing them. Also have a roll of masking tape and a perma-
nent, waterproof marking pen to label each part or
assembly. If the snowmobile was purchased second hand
and it appears that some of the wiring may have been
changed or replaced, label each electrical connection be-
fore separating it.
5. Use a vise with protective jaws to hold parts. If protec-
tive jaws are not available, insert wooden blocks on either
side of the part(s) before clamping it in the vise.
6. Remove and install pressed-on parts with an appropri-
ate mandrel, support and hydraulic press. Do not try to
pry, hammer or otherwise force them on or off.
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