86 TP-7044 6/23
3.9.6 Siphon Break
A siphon break prevents seawater entry into the generator set’s engine when the engine exhaust manifold outlet is less than
230 mm (9 in.) above the waterline of a fully loaded, docked or stationary craft. See Figure 43. The siphon break may malfunction
when the generator set operates while the craft is in contaminated waters or saltwater. Use the following procedure to inspect
the siphon break at the intervals listed in the service schedule.
Siphon Break Inspection
1. Stop the generator set.
2. Remove the retaining cap and remove the reed valve for inspection. See Figure 42.
3. Use a mild detergent to remove residue and oxidation from the reed valve.
4. Clear blockage from the reed valve opening.
5. Replace the siphon break if the reed valve is cracked or if the reed valve material has hardened or deteriorated.
6. Install the reed valve into the mounting base with the valve downward. See Figure 42.
7. Install and only finger tighten the retaining cap. Do not overtighten it.
Note:
Ensure that the siphon break’s cap is tight before operating the generator set.
Figure 42 Siphon Break
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