Volvo D2-55(D) exhaust leg SS replacement - ?temperature gauge in old leg?

[Nickbb]

Hi team, hoping someone can help me with this. I've bought the stainless steel replacement exhaust leg for my Volvo D2-55. (I'm a long way from my boat currently).

I note that the original exhaust leg seems to have a sensor in the top (circled in green). Which I'm assuming is a temperature sensor. Which would be recording the raw water temperature in the leg / the temperature of the leg itself (gas+raw water...).

I'm not sure if this is an aftermarket add on by the previous owner. I won't have time to get the holes/threads done on the stainless steel leg.

Any ideas where this temperature/sensor input would be going? Why it has been put in?

Can I get away without using it...?
Thank you.
Nick

 

[Tranona]

Almost certainly an add on overheat alarm connected to a warning buzzer.

 

[emmalina]

Its not temperature sender its a bi-metalic switch to set of some kind of alarm if the elbow gets to hot (no water flow) . Fasten it to the same place with a jubilee clip.

 

[penfold]

Its not temperature sender its a bi-metalic switch to set of some kind of alarm if the elbow gets to hot (no water flow) . Fasten it to the same place with a jubilee clip.

That's exactly what it is; just a home-brew water injection/pump failure detector to prevent overheating the exhaust hose.

 

[Nickbb]

thanks all!

 

[SimonD]

Don't know if you're thinking of refitting it, but I can recommend fitting a temperature alarm. The subject has come up before, but I've just fitted a Silicon Marine alarm (Home: Silicon Marine). Much easier than drilling a hole in your new exhaust! Considering that a loss of cooling water can quickly melt the hose and possibly the muffler (as me how I know!) I think it's essential.

 

[rogerthebodger]

This is the kind of thermo switch you need

KSD301 Temperature Switch Normally Open NO 60°C Bimetal Thermal Protector Thermostat

They are available for various temperature switching so check with you existing one to match

I have one on my exhause fitted in the same way but the screws ceased due to heat so make sure you can remove the existing one if not you may need a nw one