Mitsubishi 6M70 Workshop Manual page 25

• Remove all the injectors. (See Gr13.)
• Cover the injector mounting holes with shop towels or other sim-
ilar cloth. Crank the engine using the starter. Ensure that no for-
eign matter is attached on the shop towels.
CAUTION
• If cracks or any other damage are evident in the cylinders,
this means that the coolant, engine oil or fuel, or other sub-
stances, has entered the cylinders. If this is the case, it is
extremely dangerous to crank the engine as these sub-
stances will gush out at high temperature from the injector
mounting holes. Stay away from the engine when cranking
it.
• Attach the nozzle gasket and
Then, connect a compression gauge to
• Crank the engine and measure the compression pressure.
• Measure the compression pressure for all the cylinders one after
another. Determine the compression pressure difference be-
tween the cylinders.
• If the compression pressure is below the limit or the pressure dif-
ference between each cylinder is not within the limit, pour a
small amount of engine oil into the corresponding mounting hole
and measure the compression pressure again.
• If the compression pressure increases, the piston rings and
inner surfaces of cylinder may be badly worn or otherwise
damaged.
• If the compression pressure remains unchanged, there may
be seizure in the valves, the valves may be incorrectly seated
or the cylinder head gasket may be defective.
• Install the injector. (See Gr13.)
• Install the rocker cover and the gasket. (See "ROCKER COV-
ER, ROCKER AND SHAFT".)
11
to one of the mounting holes.
.
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