Hot Nanni! (4190)

[Gi-Lo]

Originally Posted by DeepFrz

They can be rebuilt. Its a possibility but do the heat exchanger, thermostat and mixing elbow first

Thanks..... Im working through the list..... Thermostat next!!

[Gi-Lo]

Originally Posted by Snowpetrel

. Also time how long it takes to fill a bucket of water out from the exhaust at idle rpm, and a few other engine revs.

I'm intrigued.... how long should I expect it to take to fill a bucket?

[jamhass]

Not sure about the Nanni, but on our Volvo, the raw water also runs through an oil cooler and a tranny cooler, either of which can be plugged.

Also, worth carefully checking the water pump">raw water pump again. Just because the impeller is all there, it may have gotten stiff, seriously reducing flow. Also, check the cam (the sorta flat piece screwed opposite the outlet. It can trap debris in the pump inlet, and it is not that uncommon for its holding screw to fail, allowing it to slip out of position and reduce flow. Finally, also check the cover AND the wear plate behind the impeller. If either badly worn can also reduce flow.

As both a diagnostic and a good backup, consider buying a new or rebuilt raw water pump and swapping it out for your existing pump if nothing else works.

Yup, been through all of the above at one time or another.

[Gi-Lo]

Originally Posted by jamhass

Not sure about the Nanni, but on our Volvo, the raw water also runs through an oil cooler and a tranny cooler, either of which can be plugged.

Also, worth carefully checking the raw water pump again. Just because the impeller is all there, it may have gotten stiff, seriously reducing flow. Also, check the cam (the sorta flat piece screwed opposite the outlet. It can trap debris in the pump inlet, and it is not that uncommon for its holding screw to fail, allowing it to slip out of position and reduce flow. Finally, also check the cover AND the wear plate behind the impeller. If either badly worn can also reduce flow.

As both a diagnostic and a good backup, consider buying a new or rebuilt raw water pump and swapping it out for your existing pump if nothing else works.

Yup, been through all of the above at one time or another.

Thanks for that, are you sure the Raw water pump is the same? your description sounds different to mine...... anyhoo I have a brand new impeller in my raw water pump..... that all seems to be working fine.... Thanks again for the suggestions tho!