Cleaning; Measure - Winnebago 1987-1989 LeSharo Service Manual

ENGINE OVERHAUL AND REBUILD
CYLINDER HEAD
CLEANING
• Clean all components and keep matched items
together.
• It is very important not to scrape the gasket
faces on aluminum parts.
• Use a gasket solvent solution to disolve any
part of the gasket still remaining stuck to the
cylinder head.
- Brush the liquid onto the area to be cleaned;
- Wait about 10 minutes, then lift the
remnants off with a wooden scraping tool.
- Gloves should be worn during this operation.
• The valve chambers can be cleaned with a very
fine wire brush in an electric drill.
• A soft abrasive scouring pad such as
Scotchbrite~ or equivalent may be used with
solvent to clean surfaces.
• All grease, oil,
&
carbon should be removed
with a good quality cleaning solvent and
thoroughly dried with compressed air.
• Thoroughly clean and flush camshaft and its oil
passages. Dry with the compressed air.
WARNING
I
I
r-
I
r
[
Always keep sparks and open flame away from
commercial solvents and cleaners to prevent fire
from occuring. Always follow manufacturer's
instructions when using these types of products.
Safety eyewear should always be worn when
working with compressed air.
MEASURE
• Use a straightedge (A) and a set of feeler gauges
to measure the cylinder head for flatness.
The maximum allowable distortion is 0.05 mm
(0.002 in)
IMPORTANT
• The cylinder head must not be resurfaced. If it is
not within the distortion specification, it must
be replaced.
WARNING
A warped head could be caused by an overheat
condition. Check cooling system (See Section E -
Cooling System)
83-10