Indmar 5.7L Vortec Operator's Manual page 71

In catalytic converter-equipped engines,
Indmar does not recommend applying fog-
ging oil while the engine is running. The fog-
ging oil could damage the catalytic convert-
er. The cylinders can be protected by remov-
ing the spark plugs and applying the fogging
oil directly into the cylinders.
4. Carefully loosen the flame arrestor and lift it far
enough to insert the tube of the fogging oil can.
Spray 4-6 ounces (118-177 cc) of fogging oil into the
throat of the carburetor or throttle body. Shut off the
engine. Reattach the flame arrestor and seal with
low tack tape.
5. Perform annual maintenance, refer to Chapter 6,
Scheduled Maintenance Chart .
6. Loosen all accessory drive belts and check condition.
Replace belt(s) if cracked or damaged.
7. Drain seawater section of the cooling system.
NOTICE
Placing all drain plugs, impeller, etc. in a plastic bag
and attaching the bag to the steering wheel of the
boat is a good reminder to reinsert the plugs when
you recommission the boat in the spring.
Indmar Marine Engines
All Engines:
1. Drain water from exhaust manifolds except on salt
water series engines. Uncouple the hose quick
disconnect and drain the manifolds. Indmar
recommends that you leave the drain plugs out,
or the hose uncoupled, until spring.
2. Remove both hoses from the seawater pump on the
front of the engine. Drain any remaining water from
the hoses.
Figure 7.1 – Quick Disconnect
INDM-A038
7-3