December 30, 1960
Bulletin No. SB-821
Trouble shooting
SUBJECT: Water in cylinders; 1960 V-75 engines.
Back on July 22, 1960, service bulletin No. SB-789 was issued to correct the problem
of water getting into cylinders of 1960 V-75 engines. The recommended cure was to
drill a 1/8-inch hole in the walls of both the exhaust cover and outer exhaust housing
#307180.
Recently we have received a few reports that some dealers are still experiencing the
problem of water in cylinders even though the recommended 1/8-inch hole was drilled.
Because these reports failed to specifically state whether or not this hole was drilled
through the walls of both the exhaust cover and outer exhaust housing #307180, the
possibility exists that only the exhaust cover may have been drilled through. If this
condition does exist, the driveshaft tube contained in outer exhaust housing #307180
will not be vented as required, and will consequently continue to permit water to pass
into the crankcase and then into the cylinders.
Rare as the foregoing possibility may be, we nevertheless wish to stress the absolute
necessity for drilling through two walls...one in the exhaust cover, the other in the
outer exhaust housing. Unless this is fully performed, water in cylinders may continue
to be a problem which can repeat itself with each powerhead replacement.
We suggest that service bulletin #SB-789 be reviewed; and also recommend that each engine
below the serial numbers specified therein be checked for the required two-wall drilling
when such engines persist with the water-in-cylinders problem.
Should the foregoing check indicate that both walls have been properly drilled and the
powerhead still takes water into the cylinders, check further for the following possible
causes:
1. Misconnection of the intake manifold vacuum hose to the water outlet on the
automatic choke.
2. Warped cylinder heads (replace with new heads & gaskets).
3. Warped cylinder head surfaces on cylinder assembly (occurs only rarely, but
when it does, replace with new cylinder and crankcase assembly).
4. Incorrect cylinder head gaskets.
5. Faulty sealing of cylinder head gaskets due to:
a. gasket surfaces (on heads & cylinders) incompletely cleaned.
b. reinstallation of used gaskets (Don't do it!)
c. improper torquing of cylinder head screws.
6. Warped exhaust covers (replace).
7. Faulty sealing of inner & outer exhaust cover gaskets due to:
a. gasket surfaces (on exhaust covers) incompletely cleaned.
b. reinstallation of used gaskets (don't do it!).
c. improper torquing of exhaust cover screws.
(over)