TP-5592 7/96 Scheduled Maintenance 3-15
NOTICE
Seawater damage! High-mineral content seawater
(saltwater) causes rapid deterioration of all metals.
Wipe up all saltwater spillage on and around generator
set and keep metal surfaces free from accumulatedsalt
deposits.
Cleaning
For optimum protection, drain the cooling system at the
interval listed in the service schedule.
1. Open petcocks located at heat exchanger, engine
block, and cooling system and letthe system drain
completely. Some models may have petcocks
located behind the belt guard. Remove the
pressure cap to make draining easier.
2. Drain, clean, andflush coolant recoverytank. Use
chemical cleaners for badly rusted or corroded
coolingsystem;follow manufacturer’sinstructions.
3. Flush system with clean water before filling with
recommended coolant.
Pressure Cap
Closed/heat exchanger systems incorporate a
pressurized cap to raise the boiling point of the coolant
enabling higher operating temperatures. If the cap
leaks, replace the cap with one of the same type and
rating. Find the pressure cap rating in Section
1—Specifications.
Seawater Pump
These models use a belt-drivenseawater pumplocated
on the service side. Check and change the seawater
pump as listed in the service schedule.
Siphon Break
A siphon break provision prevents seawater entry into
the engine when the engine exhaust manifold outlet is
less than 9 in. (23 cm) above waterline of a fully-loaded,
shut-downcraft. Whenthecraftisusedincontaminated
waters or saltwater, the formation of corrosion may not
allow the siphon break to function correctly. Check the
siphon break as listed in the service schedule. Use the
following procedure to ensure correct functioning of the
siphon break.
1. Stop the generator set.
2. Remove retaining cap to inspect reed valve
assembly. See Figure 3-12.
3. Clean reed valve toremove residue and oxidation.
4. Check that reed valve (opening) is clear.
5. Replacesiphonbreakifitiscrackedorifreedvalve
material has hardened or deteriorated.
6. Install reed valve into mounting base with valve
downward.
7. Install retaining cap and finger-tighten only. Donot
overtighten.
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