2006 340 8.1 water pressure

sejensen737

Active Member
Apr 3, 2010
133
Sarnia
Boat Info
2006 340
Engines
8.1 Mercs
Port raw water pump bearings failed. Rebuilt with mercruiser bearing and shaft and seal kit. New impeller.
Port water pressure at idle 1.0 psi
Stbd 2.6 psi

Port at 1000 rpm 1.8 psi
Stbd 4.8 psi

Port at 1500 rpm 5.2 psi
Stbd 8.6 psi

Coolant temp once stabilised 160 degrees both engines through rev ranges.

Do I have a pressure sensor problem or a worn out raw water pump casing? Pumps have 300 hrs on them.

Additionally , where the heck are the water pressure sensors? They are not on the pumps.
 
Last edited:
My last boat use to run 1 lb. at idle on both engines since new and about 17 at 5k.
If your temps are stable at 160 I wouldn't be concerned at all.
 

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