What sets off overheat alarm on volvo penta alarm panel

[Ian MacAulay]

for some time now I been battling to find the cause of my over heat alarms going off.

temp gauges all seam fine but alarms keep going off. it started at 3000rpm + but now is going off at 2000rpm so getting worse... I took a look at where it gets its tempter feed from and it appears that the temp sender coming from the water temperature on the top of the engine only feeds the gauge. Is there a second temp sender is so where and what's it measuring oil or water?

Need to get to the bottom of this as now defiantly thinking I may really have a overheat issue. They are twin ad41 lumps


thanks

Ian

 

[XPS]

What temp is the guage reading ?

 

[Ian MacAulay]

both reading 80-85

thanks

Ian

 

[volvopaul]

The alarm sender sets off the alarm not the temp gauge sender so it's a faulty sender.

 

[volvopaul]

The alarm sender is next to the temp sender on the stat housing .

 

[Ian MacAulay]

Thanks Paul.

I only have one sensor on the thermostat housing and that has a single brown wire that goes direct in to the loom and on the other end goes straight to the gauge. also both engines are doing it but starboard one not quite as quickly.

thanks

Ian

 

[XPS]

Should be two senders, one for guage and the second for the alarm

 

[Ian MacAulay]

 

[Ian MacAulay]

I seam to have just a blank plug.. reading up I understand it's the brown and white wire but that seams to dive low and go somewhere else.

 

[volvopaul]

Senders in the exhaust manifold, underside.

 

[Ian MacAulay]

Thanks Paul

Is it common for these to go then as both engines are doing it of some degree? You happen to know the part no. Or where I can find it as volspec site I can only see the two oil ones and one water one

All the best

Ian

 

[rosssavage]

Part number 873066 according to the DB marine website. 97deg temp monitor, 12v. Doesn't show the location in the drawing, but vovlvopaul is never wrong!!

http://www.volvopentashop.com/DBMar...eDieselEngines/7746620/7746620_30/7746620_094

 

[Montemar]

We have TAMD41B engines with two senders in the header tank.
The first sender went shortly after we bought the boat which caused great upset despite the temp gauges looking OK.
Shortly after the other engine did the same. Now have new senders and no further problems.

 

[Ian MacAulay]

Part number 873066 according to the DB marine website. 97deg temp monitor, 12v. Doesn't show the location in the drawing, but vovlvopaul is never wrong!!

http://www.volvopentashop.com/DBMar...eDieselEngines/7746620/7746620_30/7746620_094

Yes I agree his never wrong but just can't seem to find the part on a drawing anywhere.. half the company's dont seam to have them either

Thanks for the number

Ian

 

[Ian MacAulay]

Thanks everyone for the help... I order one up and see how it goes.

Would not know what to do if this forum never existed... Fantastic help and knowledge on here

 

[Racingfrank7]

Let us know how u get on. ��