TP-6591 10/1328 Section 3 Scheduled Maintenance
3.5 Backfire Flame Arrestor
At the interval specified in the service schedule, inspect,
clean, or replace the backfire flame arrestor. Clean the
arrestor more frequently if the generator set operates in
dirty, dusty conditions. Check the element for
accumulated oil or dirt that could clog the element and
cause poor performance. See Section 1 for location.
Replace a damaged flame arrestor. Use only USCG-
approved Kohler replacement parts. Follow the
procedure described below.
Backfire Flame Arrestor Cleaning Procedure
1. Loosen the hose clamp at the breather hose at the
air silencer fitting and remove the hose.
2. Loosen the hose clamp attaching the air silencer
assembly to the carburetor.
3. Lift off the air silencer assembly.
4. Clean the assembly in evaporative solvent and
wipe clean. Allow to dry.
5. Reassemble using the reverse sequence.
3.6 Exhaust System
Carbon monoxide.
Can cause severe nausea,
fainting, or death.
The exhaust system must be
leakproof and routinely inspected.
WARNING
Inspecting the exhaust system. Carbon monoxide can
cause severe nausea, fainting, or death. For the safety of
the craft’s occupants, install a carbon monoxide detector.
Never operate the generator set without a functioning carbon
monoxide detector. Inspect the detector before each
generator set use.
At the interval specified in the service schedule, inspect
the exhaust system components (exhaust manifold,
catalyst assembly, gasket(s), exhaust hose, hose
clamps, silencer, and outlet flapper) for cracks, leaks,
and corrosion.
Ensure that the carbon monoxide detector(s) is (1) in the
craft, (2) functional, and (3) energized whenever the
generator set operates.
For your safety: Never operate the generator set
without a functioning carbon
monoxide detector(s) for your
safety and the safety of others on
your vessel.
Exhaust System Inspection Points
Check for exhaust leaks and blockages. Check the
silencer and piping condition and check for tight exhaust
system connections.
D Check the hoses for softness, cracks, leaks, or dents.
Replace the hoses as needed.
D Check for corroded or broken metal parts and replace
them as needed.
D Check for loose, corroded, or missing clamps.
Tighten or replace the hose clamps and/or hangers as
needed.
D Check that the exhaust outlet is unobstructed.
D Visually inspect the exhaust system for exhaust leaks
(blowby). Check for carbon or soot residue on
exhaust components. Carbon and soot residue
indicates an exhaust leak. Seal leaks as needed.
3.7 Cooling System
3.7.1 Closed Heat Exchanger
In a closed cooling system, the seawater circulates
through separate chambers within the heat exchanger
to cool the engine water. The seawater then mixes with
engine exhaust and ejects out the exhaust outlet. See
Figure 3-6 for coolant capacity (include coolant
recovery tank capacity of 0.47 L (0.5 qt.). See
Figure 3-7 for thermostat and pressure cap ratings.
Model L (Qt.)
All models 3 (3.2)
Figure 3-6 Coolant Capacity
Model 5/7.5/10EKD
Pressure cap rating 96.5kPa(14psi)
Thermostat rating
79_C (175_F)
Figure 3-7 Pressure Cap and Thermostat Rating
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