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Tamd40B overheating, any experts out there :-)

R

Rasmusen

New member
Hi

We have two Volvo Penta TAMD40B engines. Last season our port engine got a little hot when running max rpm, lovwering to 3000 and temperature lowered again. This season it gets hot running 1000 rpm and in gear. We have cleaned and maintained Oilcooler, HeatExchanger and checked impeller in the sewater pump.

* Pulled of the hose on the exhaust elbow and plenty of seawater coming out in idle. The exhaust elbow did not look blocked, though have not removed it completely.
* No bubbles in the termostat housing and the coolant water is clear

I therefore did a detailed analysis with a temperature gun and monitoring both engines over time.
My assumption is that it has to be the freshwater pump since the temperatures rising is at, or close to the freshwater areas.

Analysis is attached

Thanks :)
 

Attachments

  • Volvo_Penta_TAMD40B_Temperature_Test_EN.pdf
    72.5 KB · Views: 18
Found the problem with the engine.

It turned out to be the freshwater cooling circuit. I loosened the coolant hose to the turbo and started the engine, but no water came out of the hose.

I then checked the pulley on the freshwater pump and discovered that the shaft wasn’t turning at all :). So I guess the pulley must have come loose from the pump shaft.

My focus until now had not been on the freshwater cooling circuit, because the mechanics I spoke to told me that it was basically impossible for the freshwater pump/circuit to be the problem. Even though I presented them with my detailed measurements, they still insisted that there was a 99% chance the problem was in the seawater cooling circuit.

So, to everyone else out there: trust your gut feeling :)
 
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