April 25, 1960
Bulletin No. SB-777
SUBJECT: MARINE CARE OUTBOARD ENGINE TUNE-UP
Under certain conditions it is possible for the pistons and
cylinder walls to accumulate a thin coating of petroleum gum,
a sticky varnish-like substance which, over a period of time
and for no apparent reason, results in excessive piston and
piston ring drag causing sluggish engine performance as evidenced
by a gradual R.P.M. decrease. In extreme instances it is apt
to cause complete seizure of the pistons in the bores, part-
icularly after periods of storage. It has been determined that
proper use of Marine Care Engine Tune-Up will remove much of this
varnish and gum without tearing down the engine. In most cases
normal engine performance can be restored.
Recently we have received adverse criticism concerning the
results of using Marine Care when engines are stored. Investigation
indicates these results must be attributed to incorrect
application rather than to the product itself. Marine Care
Outboard Engine Tune-up is a cleaner, not a preservative, and
should be used in strict accordance with the following procedure:
1. Run engine to normal operating temperature. Remove from
test tank.
2. Remove spark plugs and set pistons so intake and exhaust
ports are closed.
3. Tilt engine to horizontal position with spark plug holes up.
4. Cover top of pistons with Marine Care Outboard Engine Tune-up.
5. Let stand in horizontal position for 30 minutes or longer (overnight in extreme cases).
6. Turn engine over so spark plug openings face downward. Pull starter handle several
times so as to force excessive fluid out thru spark plug openings.
7. Put engine in test tank, replace plugs (cleaned & regapped) and run engine to normal
operating temperature.
NOTE: Starting engine may be more difficult than normal because pistons and
cylinder surfaces are wet with cleaner, particularly so if the spark
plug electrodes are fouled or excessively coated with cleaner, carbon
and/or oil. To ease starting effort, clean and regap spark plugs before
starting engine.
8. Slowly run 2/3 of a pint can Marine Care through carburetor throat at fast idle.
(Use oil spout can)
9. Increase speed and pour balance of cleaner in fast enough to stall engine.
10. Let stand for another 30 minutes or longer.
11. Start engine and run at advanced throttle for 5 minutes.
NOTE: For engines which are to be operated on a boat following the cleaning
operation, step 11 completes the cleaning process. However, if engines
are to be placed in storage for any length of time, complete step 12.
12. Fog engine thoroughly with a rust preventive oil.
CAUTION NOTE: Step 12 is extremely important to adequately protect engines in
storage and MUST NOT BE OMITTED after cleaning.
(over)