Perkins 4108 temperature valve

[pcatterall]

Just removed the header tank from my donor engine. The temperature valve is totally gummed up with all sorts of crud and has clearly not been functioning! I will remove, clean and test though I suspect it is beyond help! Can anyone inform me as to what the temperature of a new valve should open at?
I note that the engine on board runs at 70 degrees at our 2000rpm cruising speed, does this indicate that the valve there needs replacing as I would think that it should go to at least 80 before opening.
At least I know what has to be taken off to get at the valve.
My work on the engine rebuild has been worthwhile even just as a practical way to learn more about working on these engines and the tools and tricks required!
I really value all the advice garnered along the way.

 

[Old Bumbulum]

You appear to be refering to the thermostat - that is what controls the engine's remperature.
If so it would be most unusual to rebuild an engine without replacing such a cheap yet critical component.

 

[pcatterall]

You appear to be refering to the thermostat - that is what controls the engine's remperature.
If so it would be most unusual to rebuild an engine without replacing such a cheap yet critical component.

Thanks for that, apologies for my terminology ( a senior moment but I though temperature valve would be understood)
It will be useful to know what temp rating is used for these engines in a marine environment as I recall reading that some people fit cooler opening thermostats
on marine conversions. (and I take the point about a 10 quid part!)

 

[pvb]

Can anyone inform me as to what the temperature of a new valve should open at?

With similar Volvo Penta engines, the thermostat will start to open at around 80 degrees and be fully open at around 90 degrees.

 

[VicS]

Thanks for that, apologies for my terminology ( a senior moment but I though temperature valve would be understood)
It will be useful to know what temp rating is used for these engines in a marine environment as I recall reading that some people fit cooler opening thermostats
on marine conversions. (and I take the point about a 10 quid part!)

Thermostats are usually marked with the temperature at which they just begin to open. Sometimes also with the temperature at which they are fully open.

Worth, therefore, cleaning the old one and looking to see if its is marked


According to Parts 4 Engines 75C for marine use ( 82C for automotive and industrial use)

https://www.parts4engines.com/perkins-4-108-thermostat-kit/

 

[scottie]

Assuming it’s not direct cooled engine in which case it should be 70^