Engine over heats

[Paradise pontoon]

Hello Volvo 5.0 GL overheating! Checked vents and all hoses for some kind of blockage nothing found! Replaced sea pump. Replaced thermostat. Still overheating. Replaced circulation pump still overheating. Pulled lower unit check suction tube all good. What I’m I missing?! Not the gauge it’s getting very hot

 

[Scott Danforth]

overheat is no flow

what drive? is the fitting on the front edge of teh drive that connects to the supply hose intact?

is water getting to the impeller?

is there debris in the PS cooler?

 

[alldodge]

Get a short piece of clear hose from the hardware store, along with a double barbed fitting and hose clamps.

Place the clear hose at the thermostat housing and hose coming from pump. See if you see bubbles

 

[Paradise pontoon]

overheat is no flow

what drive? is the fitting on the front edge of teh drive that connects to the supply hose intact?

is water getting to the impeller?

is there debris in the PS cooler?

Penta xs. I was thinking might be oil cooler

 

[Paradise pontoon]

Penta xs. I was thinking might be oil cooler

Yes water gets to sea pump but only high rpm

 

[Paradise pontoon]

Ye

Get a short piece of clear hose from the hardware store, along with a double barbed fitting and hose clamps.

Place the clear hose at the thermostat housing and hose coming from pump. See if you see bubbles

s we done that it pump’s fine. Takes high RPM to sea pump to start pumping

 

[alldodge]

Ye

s we done that it pump’s fine. Takes high RPM to sea pump to start pumping

Then your sea pump is the problem. The pump should be pumping at idle

 

[Lou C]

Also don’t forget to also replace a scored wear plate in the impeller housing….

 

[Paradise pontoon]

Also don’t forget to also replace a scored wear plate in the impeller housing….

Replaced the whole sea pump

 

[Paradise pontoon]

Then your sea pump is the problem. The pump should be pumping at idle

New complete sea pump

 

[alldodge]

New complete sea pump

Then there is a air leak between drive and pump.
Meaning the new impeller in the pump may have burned because it took to long to get water to it

 

[Paradise pontoon]

Then there is a air leak between drive and pump.
Meaning the new impeller in the pump may have burned because it took to long to get water to it

Ever see a power steering cooler be plugged up? I’m thinking that’s got to be it

 

[alldodge]

Ever see a power steering cooler be plugged up? I’m thinking that’s got to be it

Maybe, but a PS cooler has larger openings then a oil cooler, but something may have gotten in there which caused the restriction. If it did restrict water for even a few seconds the raw water pump impeller could be burnt and no longer pump

 

[Paradise pontoon]

Maybe, but a PS cooler has larger openings then an oil cooler, but something may have gotten in there which caused the restriction. If it did restrict water for even a few seconds the raw water pump impeller could be burnt and no longer pump

Yes it’s burnt up a couple times already replaced 3 times

 

[dypcdiver]

How old is the motor? I had a similar problem that turned out to be a hole burnt in the dogleg tube between upper and lower units of the drive. It was sucking exhaust gasses as it runs inside the exhaust tube.

 

[Scott Danforth]

Yes water gets to sea pump but only high rpm

You have an inlet issue. Most likely a broken inlet fitting. Just follow the hose from the transom shield to the drive. That little white metal or plastic fitting is a common inlet issue

The PS cooler and the oil cooler use 1/4" OD tubing with 0.020" wall for the tube bundle. Doesn't take much to plug them with only a 0.21" ID in the tubes

 

[Paradise pontoon]

Yes it’s burnt up a couple times already replaced 3 times

Have removed all hoses and looked through them all clear no holes I think tomorrow I’ll remove steering cooler to to make sure

How old is the motor? I had a similar problem that turned out to be a hole burnt in the dogleg tube between upper and lower units of the drive. It was sucking exhaust gasses as it runs inside the exhaust tube.

pulled mine out looks like new

 

[Paradise pontoon]

Well here’s where I’m at! Pulled steering cooler, this type doesn’t have small holes. It has 1” hole through it. I haven’t found anything that would cause this problem. So I’m replacing everything that has to do with suction. I’ll let you know

 

[Scott Danforth]

look at item #9. they are prone to failure

after that, look at seal #8

 

[Lou C]

Those can crack esp if water was not drained out in winter.
The other thing that can cause trouble is the water tube grommets in the lower unit