Volvo Penta TAMD31 Question

[tony_lavelle]

My Pedro 950 has a Volvo Penta TAMD31 engine. There is hose connecting the turbo to the stern tube, apparently to supply cooling water. The steel union to the bronze stern tube corroded and snapped off causing a jet of sea water into the bilge. I have had the union replaced and re-tapped into the stern tube.

Can anyone explain to me why the turbo needs its own cooling water supply when the engine has a perfectly good cooling system already?

 

[volvopaul]

My Pedro 950 has a Volvo Penta TAMD31 engine. There is hose connecting the turbo to the stern tube, apparently to supply cooling water. The steel union to the bronze stern tube corroded and snapped off causing a jet of sea water into the bilge. I have had the union replaced and re-tapped into the stern tube.

Can anyone explain to me why the turbo needs its own cooling water supply when the engine has a perfectly good cooling system already?

I cannot see the stern tube hose connecting to the turbo housing , I think you will see it’s connecting to the exhaust elbow that’s bolted to the turbo .
sea water exits the exhaust elbow.

 

[tony_lavelle]

I cannot see the stern tube hose connecting to the turbo housing , I think you will see it’s connecting to the exhaust elbow that’s bolted to the turbo .
sea water exits the exhaust elbow.

Thanks. I'll have another look next time I'm on the boat.

 

[Plum]

My Pedro 950 has a Volvo Penta TAMD31 engine. There is hose connecting the turbo to the stern tube, apparently to supply cooling water. The steel union to the bronze stern tube corroded and snapped off causing a jet of sea water into the bilge. I have had the union replaced and re-tapped into the stern tube.

Can anyone explain to me why the turbo needs its own cooling water supply when the engine has a perfectly good cooling system already?

Hopefully your new union is not of steel. Assuming you have the usual Volvo Penta shaft seal on your stern tube, then that water supply is more likely going TO that shaft seal FROM the engine seawater cooling circuit. Can you post some photographs?

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