Help Needed Lister OverHeating!!! at sea now

[Eastanglian87]

I have a Lister Stw3 engine and its over heated, waters getting to the engine but not out, Checked impeller seems ok, checked jabsco fine, and checked seacock .....Havent got a clue what it could be ??? any advice appriciated on boat now

 

[Talulah]

Have you checked sea water strainer.
Also, is the strainer empty. Some require priming.

 

[Eastanglian87]

is that the strainer at the seacock that seems fine

 

[Talulah]

Have you lost blades from the impellor recently and not found the missing blades when replacing the impellor? The missing blades could be a reason for the blockage.

 

[penfold]

Water entry point on the exhaust elbow may be blocked, usually by corrosion debris.

 

[Eastanglian87]

Nope no missing blades :-(

 

[Talulah]

Do you have an anti-syphon valve? Is it blocked?
Quick solution is to connect cooling water outlet directly to exhaust injection point negating anti-syphon valve.

 

[Eastanglian87]

Going to check this now

 

[Talulah]

When you put the cover on the sea water pump back on did you position it in the same orientation?
If not look at wear on inside of cover and put back in original orientation.

 

[Eastanglian87]

Not had boat long and havent a manule for it so could have trouble testing the anti-syphon valve.

 

[Eastanglian87]

Yes is in same orientation

 

[Mel]

Try removing thermostat - can do no harm, but might increase flow
Can you run at lower speed and not have high temp. alarm ?

 

[Eastanglian87]

the only thing i have done is have the exhaust manifold thing off yesterday to put gaskets on, put back on today

 

[Talulah]

Not had boat long and havent a manule for it so could have trouble testing the anti-syphon valve.

We have a clear pipe going to ours so I can see if water is moving.
I would disconnect the sea water cooling pipe from the exhaust injection point and see if water flows out when you turn the engine. Don't run it for long.
If it does then as previously mentioned a blocked mixer elbow would be the next probable cause..

 

[Eastanglian87]

stopped engine for a bit had it running again slow enough to get back to mooring and get a better look

 

[Eastanglian87]

im trying to have a look at this exhaust elbow think it could be the cause, hard being single handed will let you know any advise welcomed thanks to the response so far

 

[penfold]

If you can remove the hose supplying water to the exhaust elbow, try and poke through it with a bit of wire or a screwdriver.

 

[timmygobang]

Had a similar issue the other weekend, pipe came off the back of the heat exchanger. Any water in the bilges?

 

[Eastanglian87]

Thanks all problem solved was blockage in exhaust thanks for all your help

 

[sailorman]

Thanks all problem solved was blockage in exhaust thanks for all your help

How did that happen, is the hose de-laminating