VP overheat alarm switch

[snowbird30ds]

Has anyone found an alternative to the volvo penta overheat alarm temperature switch on the thermostat block?
One of mine comes on even from cold so must a duff switch but £120+ is just taking the pee for something so simple, I was thinking radiator fan switch but need one with the same thread with minimal wiring modification.

 

[Snowgoose-1]

Hi
Just for info, is the engine the 2000 series ?.

 

[snowbird30ds]

No it's a tmd41a.

 

[Sandy]

What trouble shooting have you done? Do you know why this is happening? Have you tested the sensor?

I only have a VP2002 so can't be much assistance.

 

[Metalicmike]

Try Parts4engines,com, that price you have is ludicrous.

 

[snowbird30ds]

None yet, boat is 100 miles away and I was going to get a switch till I saw the price, meter comes out next visit and switch gets disconnected to check the light goes out.
Just thought I'd pose the question in case someone's found a cheap alternative.

 

[peteK]

Find the part number which may be stamped on the sender and look on ebay or just google it.You may find its used on a motor vehicle.

 

[AMOREST]

You might try this - self build (I made this from this article and it works great)

It provides an in line cooling flow monitor / alarm / buzzer and LED. Not bad for not much money.
It tells you there’s a problem - before the engine overheats. (Or if you’ve not opened the sea cocks)

There may be better systems out there now but not for this price.

DIY engine cooling water alarm - Practical Boat Owner

 

[snowbird30ds]

Does anyone know the thread on the 2000 series engine switch? I believe mine is M18x1.5 as that is what the sender is (I have an old one in the shed), I would imaging volvo would use similar across the range.

 

[Metalicmike]

Make sure you buy the correct type as it could be an over temperature eg bimetal switch, or a variable resister which would normally drive a temperature gauge but could be set to trigger a max temp alarm.

 

[Ammonite]

If you can identify the part number from the schematic below you should be able to find it much cheaper elsewhere. Just be aware that Volvo have a habit of changing the connections so double check which type you have first. If its 833927, for example, SVB24 are selling them for €44 but I suspect you'll be able to find them cheaper than that with a bit of searching.
TMD41A thermostat housing with installation components - marine diesel engines

 

[VicS]

None yet, boat is 100 miles away and I was going to get a switch till I saw the price, meter comes out next visit and switch gets disconnected to check the light goes out.
Just thought I'd pose the question in case someone's found a cheap alternative.

Keypart may have a less expensive alternative