TP-5936 7/04 15Section 5 Cooling System
5.6 Siphon Break
A siphon break prevents seawater entry into the engine
when the engine exhaust manifold outlet is less than
23 cm (9 in.) above the waterline of a fully-loaded craft.
Check the siphon break at the interval listed in the
service schedule. Use the following procedure and
Figure 5-4 to inspect the siphon break.
Siphon Break Inspection Procedure
1. Place the generator set controller start/stop switch
in the STOP position.
2. Remove the retaining cap to inspect the reed valve
assembly.
3. Use a light detergent to clean the reed valve to
remove the residue and oxidation.
4. Check that the reed valve opening is clear.
5. Replace the siphon break if it 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.
7. Install the retaining cap and finger-tighten only. Do
not overtighten.
Waterline
1
2
3
7
8
9
19
10
11
12
13
14
15
16
17
18
21
20
6
5
4
TP-5586-3
1. Mounting holes
2. Retaining cap
3. Reed valve assembly
4. Silencer vertical lift 1.2 m (4 ft.) max.
5. Exhaust mixer elbow distance above waterline. If less than
23 cm (9 in.), siphon break is required.
6. Siphon break distance above waterline 30.5 c m (1 ft.) min.
7. Siphon break
8. Exhaust mixer elbow
9. Heat exchanger (locations vary by model)
10. Coolant recovery tank
11. Coolant recovery tank
12. Seawater strainer
13. Seacock
14. Intake strainer
15. Engine-driven seawater pump
16. Exhaust hose pitch 1.3 cm per 30.5 cm (0.5 in. per ft.) min.
17. Water lock (optional)
18. Silencer distance from exhaust mixer elbow 3 m (10 ft.) max.
19. Silencer (customer-supplied)
20. Exhaust hose pitch 1.3 cm per 30.5 cm (0.5 in. per ft.) min.
21. Exhaust outlet distance above waterline 10 cm (4 in.) min.
NOTE: Consult the installation manual for complete explanation of dimensions and other installation considerations.
Figure 5-4 Siphon Break, Plastic U Type
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