Coolant cap blew - what are chances of damage?

[harojs]

VP 5.0FL

My seawater pump seized, and I overtemped within 60secs of sieze, and cap blew on heat exchanger releasing pressure. I shutdown engine within 30 seconds of cap blow.

What are chances of a head warp?

Waiting on new seawater pump, and circulation pump while I'm at it before I start a run test.

Oil not foamy, and engine was not misfiring just before the cap blow.

Should I start checkout with a compression test before run test?

John

 

[Scott Danforth]

You most likely burned the rubber exhaust hoses.

As for the motor, do a compression test and cooling system pressure test. You should be fine, however should check

How long has your raw water pump seal been leaking to cause the bearing to sieze?

 

[harojs]

Yeah, newbie salt water boater here. Have had boat a year and only a couple hour long trips so far. Boat is kept on racks and was winterized - Puget Sound. The seawater pump is probably the original from 1993. I did not notice any weeping of pump, it seeming to sieze all at once. I did hear some intermittent squeals. I probably missed the signs. Engine dropped revs just before cap blow. I haven't checked yet, but it may be just the impeller destructed. No entry of pump or impeller change in maint records. Engine has 525 hrs. I should have replaced both pumps right away when I bought it. Gonna get a flow alarm sensor.

 

[Scott Danforth]

being a salt water boat, impeller change every 2 years, drive removal for gimble bearing and u-joint inspection every year, bellows replacement every 2 years, and manifold/elbow replacment every 5 years. about every 2 years, the raw water intake fitting will need to be changed as well.

if you have a heat exchanger, then no, the engine circulating pump most likely will never need replacing.

 

[harojs]

Thanks, copy all. That will be my plan. I'm thinking maybe the circ pump is ok. Will know later next week when I take a look at it all.

 

[Lou C]

Don't forget to check the manifolds & risers unless you know when they were changed last.
VP engines with the closed system usually have only a half system unless it was specially fitted with a full system.Meaning that the manifolds are raw water cooled.
Clogged manifolds and risrrs can also cause overheating