Chi Man
Well-Known Member
Boat is a Sealine S23 2004, Kad 32, fully serviced in last 18 months,
So, a bit of an issue. In January this year, took the boat out for a brief winter shake down.
This was aborted early as the engine was found to overheat and sound an alarm when the engine temperature reached 95°C.
Oil pressure figures were recorded as 70psi 3000 rpm when the temperature alarm sounded.
A short full power run on the way back to the marina achieved 26kts at 3600 rpm over a few minutes. Alarm sounded again
I had an engineer look at the cooling system and the saltwater cooling system has been descaled using RYDLYME Marine Descaler, closed cooling system has been pressure tested - All good - Sniff test carried out - new Impeller Kit fitted.
Since Feb did not use the boat much, few short slow speed trips in Chichester Harbour.
Last week was going to take a spin over to the I.O.W. cruising up Chichester harbour at slow speed 6/8 knots, no problems temp was standard and fixed at 80 degrees.
Once past the harbour speed restrictions, opened her up, bit sluggish (probably needs a scrub although had one in January) after a few minutes and at WOT temp alarm sounded, temp was around 90 degrees. Immediately throttled back, temp dropped back to 80 and alarm stopped, tried a couple of times on way back and same result, i.e at wot temp alarm went off around 90 degrees then back to 8/9 knots temp gauge dropped back to 80 and no issues.
Throughout cruise up and down Chichester harbour no issues at 6/8 knots, temp stable an at 80 seems like when under load is the issue. So, any ideas? Is it a sensor? Thermostat? Or some other issue, I am no mechanic so am getting my engineer to come and have a look but would be good to give him a bit of a steer from any experiences in the forum.
Once again thanks in advance as you guys are always very helpful.
So, a bit of an issue. In January this year, took the boat out for a brief winter shake down.
This was aborted early as the engine was found to overheat and sound an alarm when the engine temperature reached 95°C.
Oil pressure figures were recorded as 70psi 3000 rpm when the temperature alarm sounded.
A short full power run on the way back to the marina achieved 26kts at 3600 rpm over a few minutes. Alarm sounded again
I had an engineer look at the cooling system and the saltwater cooling system has been descaled using RYDLYME Marine Descaler, closed cooling system has been pressure tested - All good - Sniff test carried out - new Impeller Kit fitted.
Since Feb did not use the boat much, few short slow speed trips in Chichester Harbour.
Last week was going to take a spin over to the I.O.W. cruising up Chichester harbour at slow speed 6/8 knots, no problems temp was standard and fixed at 80 degrees.
Once past the harbour speed restrictions, opened her up, bit sluggish (probably needs a scrub although had one in January) after a few minutes and at WOT temp alarm sounded, temp was around 90 degrees. Immediately throttled back, temp dropped back to 80 and alarm stopped, tried a couple of times on way back and same result, i.e at wot temp alarm went off around 90 degrees then back to 8/9 knots temp gauge dropped back to 80 and no issues.
Throughout cruise up and down Chichester harbour no issues at 6/8 knots, temp stable an at 80 seems like when under load is the issue. So, any ideas? Is it a sensor? Thermostat? Or some other issue, I am no mechanic so am getting my engineer to come and have a look but would be good to give him a bit of a steer from any experiences in the forum.
Once again thanks in advance as you guys are always very helpful.
