Volvo Penta 4.3Gl (1998 carbuerated) running hot (or is it?!?!)

[Bobbymac746]

Hello. At the beginning of the season I had a crack in my block. Finally found someone with a replacement 4.3Gl… Upon getting it back they said they replaced the impeller and changed the oil in both the engine and the outdrive.

When I took the boat out, the oil pressure is locked on 80 for most of the ride. Finally went down in the 50s-60s after maybe 45 minutes. Started it again and it is 80. The more concerning thing is the engine temperature was sky rocketing to 225+ I limped around for a while it would drop to 200 and as soon as I went over just over 1200rpms it’s up showing 225-250.

This morning on the muffs I started it up and it is immediately showing 150 degrees. Can’t be possible right? I ran it for awhile until the thermostat read 200. I put an infrared on the engine and it showed 100. The exhaust manifold showed 130 on infrared.

The boat seems to be running okay. I’m not sure if my gauges went bad (they worked fine on my previous engine). Maybe my thermostat is bad? Maybe they put the wrong oil in? Any help on where to start would be appreciated. (I do see water coming out on the muffs. Not sure how much is supposed to come out but I assume the impeller is fine.

Thanks in advance.

 

[Scott Danforth]

gauges work on varying resistance to ground.

clean your connections on the gauge, the ground buss, the sensor, etc.

80 PSI may be a high volume oil pump. ATK generally installs them. not needed on a 4.3. what brand of remanufactured engine?

 

[Bobbymac746]

gauges work on varying resistance to ground.

clean your connections on the gauge, the ground buss, the sensor, etc.

80 PSI may be a high volume oil pump. ATK generally installs them. not needed on a 4.3. what brand of remanufactured engine?

It is another Volvo 4.3 GL.

 

[jimmbo]

You are sure the Replacement is an actual Volvo 4.3? Perhaps the Motor that was finally found and installed, was an Auto/Truck engine, even still retaining an Auto/Truck Thermostat.

 

[Bobbymac746]

You are sure the Replacement is an actual Volvo 4.3? Perhaps the Motor that was finally found and installed, was an Auto/Truck engine, even still retaining an Auto/Truck Thermostat.

 

[Bobbymac746]

gauges work on varying resistance to ground.

clean your connections on the gauge, the ground buss, the sensor, etc.

80 PSI may be a high volume oil pump. ATK generally installs them. not needed on a 4.3. what brand of remanufactured engine?

This is the sensor, correct?

 

[Lou C]

That looks like the joint venture engine used then so that’s probably not the issue you either have low raw water flow when in the water or a sticky thermostat or clogged exhaust elbows. There is a plastic fitting for the raw water intake hose in the transom mount that can crack & suck in air. Given that you’re having abnormal readings on 2 gauges I’d be checking the engine temp with an IR temp gun; take your reading on the intake manifold right under the thermostat housing; this will be the closest to the dash gauge when all is working right. On my Cobra (same exact stat housing same stat) when the dash gauge reads 160 I get about 145-150 there). Normal temps with the 160 stat should be approx 155-175. I would also try temporarily installing a mechanical oil pressure gauge to check the high op issue.

 

[Scott Danforth]

This is the sensor, correct?

follow the tan wire

gauge wires are standardized regarding color