Perkins 4-108 overheating - SailNet Community
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post #1 of 11 Old 06-27-2006 Thread Starter
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Perkins 4-108 overheating

Hello,

I have Perkins 4-108 vintage (89). Starts fine and plenty of power to move 42' sail boat around. The over heating starts at 2300 rpms from 180 °. to 220°. and plus, I have changed the impeller, thermostat, clean the mixing elbow and the heat exchanger. Can anyone give me some other ideas?

Many thanks in advance.

S/V LADY LENA __/)
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post #2 of 11 Old 06-27-2006
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Have you actually checked to see that water is flowing through the engine? If there is a blockage in the block, you may get sufficient cooling for partial operation, but not for when you exceed a certain level.

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post #3 of 11 Old 06-27-2006
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Do you have a inlet strainer? You didn't mention it in your list of what you've done. It may be partially plugged, also perhaps your intake is grown over or somehow plugged. You should be able to hear the normal sound of exhaust if it's properly wet. Is your FW coolant level OK? If it's low you will have troubles even if your RWC system is normal.
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post #4 of 11 Old 06-27-2006 Thread Starter
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Hi Faster.

Sorry but yes I did it is nice and clean and changing of thermostat top off the cooling fluid.
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post #5 of 11 Old 06-27-2006 Thread Starter
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Hi sailingdog
thank you for the tip I don't know how to check that but I'll research or if you any tips or know hows.
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post #6 of 11 Old 06-27-2006
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Check your water inlet and piping BEFORE the inlet strainer. Some years ago we had a similar problem and went through lots of $$ before finding an elbow in the inlet pipe partially blocked with kelp. This allowed enough water in to cool engine at idle but not enough when under increasing power. Hope this helps!
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Thank you Camaraderie
I"l check it on friday.
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post #8 of 11 Old 06-27-2006
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4-108 overheating

I was experiencing a similiar problem with my 4-108.

It turned out to be a leaking head gasket. I had already cleaned the heat exchange, the raw water strainer, changed the impeller, and the fresh water circulating pump.

The head gasket was all that was left and once replaced, the problem went away.
David
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post #9 of 11 Old 06-27-2006
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The most common place to have restrictions, except for clogged up heat exchanger/filter/strainer etc, is in the exhaust elbow just where the water comes out to the exhaust.
Another thing that may cause problem is that pump capacity gets reduced over the years and exhaust backpressure may start making problems.
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post #10 of 11 Old 06-27-2006
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4-108

More information:
I had also replaced mixing elbow and thermostat, in addition to the above listed items, before replacing the head gasket
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