TP-5986 4/0316 Section 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 waterline. Check the siphon break
at the interval listed in the service schedule. Use the
following procedure and Figure 5-4 to ensure correct
functioning of the siphon break.
Siphon Break Inspection Procedure
1. Stop the generator set.
2. Remove the retaining cap and the reed valve for
inspection. See Figure 5-4.
3. Use a light detergent to clean the reed valve.
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 downward into the mounting
base.
7. Install the retaining cap and finger-tighten only. Do
not overtighten.
8. Restart the generator set and inspect the reed
assembly for leaks. Replace the reed valve if
leakage occurs.
Note: Consult the installation manual for a
complete explanation of the dimensions and
other installation considerations.
Waterline
1
2
3
7
8
9
18
10
11
12
13
14
15
16
17
20
19
6
5
4
TP-5586-3
21
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.), a siphon break is required.
6. Siphon break distance above waterline 30.5 cm (1 ft.) min.
7. Siphon break
8. Exhaust mixer elbow
9. Heat exchanger (locations vary by model)
10. Coolant recovery tank
11. Seawater strainer
12. Seacock
13. Intake strainer
14. Engine-driven seawater pump
15. Exhaust hose pitch 1.3 cm per 30.5 cm (0.5 in. per ft.) min.
16. Water lock (optional)
17. Silencer distance from exhaust mixer elbow 3 m (10 ft.) max.
18. Silencer (customer-supplied)
19. Exhaust hose pitch 1.3 cm per 30.5 cm (0.5 in. per ft.) min.
20. Exhaust outlet distance above waterline 10 cm (4 in.) min.
21. Seawater outlet
Figure 5-4 Siphon Break, Plastic “U” Type
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