B3.9 and B5.9 Series Engines
Section 7 - Lubricating Oil System - Group 07
Incomplete combustion in the cylinders can result in un-
burned fuel draining into the oil pan.
This condition can be caused by a leaking injector or re-
duced compression caused by inadequate piston ring
An increase in white exhaust smoke during the first start
of the day is a symptom that an injector is leaking.
An injector leak will also cause the engine to run rough and
have low power.
Remove and repair or replace leaking injectors. Refer to
Perform a compression check to verify piston ring sealing.
Refer to Procedure 014-008.
There is a remote possibility for fuel to drain into the oil from
the diaphragm-type fuel transfer pump.
For this to happen, the diaphragm in the pump would have
to break and the drain hole would have to be plugged.