Sealine S36 - Volvo overheating

[mainshiptom]

This boat is running fine but at high revs about 25 knots one engine is over heating !

Any ideas what to check, We tried all the obvius things, because we live in the east coast we clered all the mud out of pipes.

Any other ideas?

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[Nauti Fox]

You've probably done it but heat exchanger?By the way going to St.Kats over the bank holibobs if you fancy it.
Regards, Al.

<hr width=100% size=1>No dear,the water goes in the other one.

 

[mainshiptom]

yeah tried everything !

I would love to join but I an about to finish a bathroom at home and then I am relased for the summer to go out and play, I might go up to St Kats in end of May
and stay for a while !

It is handy with work !


Tom

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[Nauti Fox]

Is it pulling the same revs?

<hr width=100% size=1>No dear,the water goes in the other one.

 

[mainshiptom]

I think so, we might go out saturday so I will look again,

we keep clearing the engine with fresh water ?

Only at top speed one engine buzzer comes on !


Tom

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[Nauti Fox]

Whats the temperature Tom?

<hr width=100% size=1>No dear,the water goes in the other one.

 

[mainshiptom]

both normal until top speed, one stay at normal the other climbs to the red bit.


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[Nauti Fox]

Bugger,won't be the sender then.Presume normal is around 80/ 90c?I did have a bit of a blockage on one of my raw water inlets where it had got plugged when sitting on the mud,stuck a hose down as far as possible and washed it out.Don't know what to suggest really,but if you need any help give me a call.
Al.

<hr width=100% size=1>No dear,the water goes in the other one.

 

[KevB]

maybe something simple like the impela wearing and not chucking enough water around to cool the temperatures of high speed? An easy thing to check.

 

[Col]

I guess Volvo KADS??
Check if one of the thermostats is stuck.

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[oldgit]

Re: Impellor .....dead easy job.NM

NM.

<hr width=100% size=1>If it aint broke fix it till it is.

 

[TRH]

As with lots of Volvo's, if the raw water is getting in, Check it's getting out fast enough. Rust and muck in the Exhaust bend will slow the flow out and overheat the engine. This when revs increase. Regards Trevor

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