Oil In Cooling Circuit - Winnebago 1987-1989 LeSharo Service Manual

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OIL IN COOLING CIRCUIT
The following must be carried out if oil is found
contaminating the cooling system:
Find the source of the oil leakage
Check for:
- Defective
oil
cooler (above oil filter) if
equipped.
Cracked cylinder block (See Engine Section)
Cracked or warped cylinder head (See Engine
Section)
Automatic transmission cooler leak (if the
contaminant is transmission fluid)
Cleaning An Oil Contaminated Cooling System
(After source of leakage is repaired)
This may be accomplished using a solution of
water and a grease emulsifying liquid
dishwashing detergent such as Dawn@. The
procedure for cleaning is as follows:
1. Drain and refill the system with clean water
(no antifr$eze) allowing space to add 8-12 oz.
of Dawn liquid dishwashing soap or an
equivalent grease emulsifying liquid dish
soap.
2. Run the engine for approximately 5 minutes
at operating temperature to thoroughly
circulate the solution.
3. Drain the system and allow the engine to
cool.
4. Refill the system with clean water only and
rinse by running the engine at operating
- temperature for 5 minutes. Then drain the
system.
S. Repeat steps 1-4 until all traces of oil are
eliminated.
6. Perform an additional rinse to ensure
removal of soap residue.
7. Fill system with a 50/50 mixture of water and
antifreeze/coolant.
8. Bleed air from the system and recheck level
(Refer to "Bleeding" - pg. E-6).
E-7