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post #4 of Old 04-29-2013
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Re: Perkins 4108 Overheating

We had asimilar issue recently with our 4108 coming up the central American coast. We got through the Panama canal and cruised for a few months up the central American coast to Costa Rica, where issues started becoming more obvious. Our fresh water pump started leaking through the weeping holes, so we need a new one. Then the motor died off El

Salvador and it took us 14 days to sail 250 mile up to Mexico.

We have pulled our motor out of the boat now. There was very little oil getting onto the valves. The oil pump worked fine, and there was no clogs. We are going to rebuild the motor (as it is already out of the boat and we just bought the boat a year and half ago with poor maintenance records for the motor).

Trouble shoot:

-impeller on raw water pump
-heat exchanger clean
-thermostat working (remove and test in a cup of boiling water)
-belt tight on fresh water pump

-remove valve cover and look for good lubrication (turn the motor over and see if oil comes out the rocker)
-correct atomization in injectors (pull injector, hook up to fuel line, hold paper in front of it, bleed and turn motor over. Do not put your hand in front of it. Look to see a nice spray pattern) or you could just get the injectors refurbished at a diesel tech shop.

After that you may have a blown head gasket, but the smoke would be white if that was the case (or you may just have a small break in the head gasket seal) You might notice water in the cylinders or a bit of hydraulic locking at start up.

Not much else after that other than timing or worn seals, bearings, or liners. Or in my case a little from all the

good luck

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