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Old 12-09-2010, 23:07   #1
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Engine Temperature

I have a recently over-hauled 50HP Perkins 4108 in my yacht and would like to know if anyone out there knows at what temperature it should run at.
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Old 12-09-2010, 23:17   #2
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If I remember right my Perkins 4-107 was at its best between 140 and 160 F. I hope others with a more current memory or a 4-108 will respond.
kind regards,
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Old 13-09-2010, 04:59   #3
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Generally speaking, an “open” raw or sea water cooled (salt) diesel engine should operate at about 140 → 160 degrees F; whereas a “closed” freshwater cooled diesel engine (/w heat exchanger) should operate at between about 180 → 190 degrees F.
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Old 13-09-2010, 05:56   #4
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Yes, that's right. The cooler temps with raw water cooling are specified in order to prevent salt precipitation in the engine's cooling passages, but diesel engines run more efficiently at higher temps (180-190F) as with closed cooling systems.

The 4-108, by the way, in the real world is way overrated in terms of HP. Although you see 50HP or 47HP or 42HP in writing, in reality it's a small engine which should be rated in the low 30's, IMHO.

I've lived with mine for 20+ years and love it. Just don't expect a lot of HP from it.

Bill
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Old 14-09-2010, 12:34   #5
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Thanks John, Gord and Bill. Seems all is well with the 4.108. Running as she should. Always good having confirmation.
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Old 14-09-2010, 12:36   #6
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Thanks all. It therefore seems that all is well with the 4-108.
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Old 14-09-2010, 21:03   #7
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where to measure

Thought I would revive this thread as I have the same question on the same motor. Am working my way through issues with my engine and operating temp is next.

I have a digital pistol type thermometer. Where is the best place to measure the engine temperature - or does it not matter?

I suspect my engine has way too much cooling capacity, and is not reaching a good operating temp.
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Old 14-09-2010, 21:21   #8
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I have never used one before, but I suppose the best spot to try would be the cooling water discharge between the engine and the heat exchanger.
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Old 15-09-2010, 01:09   #9
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Astrid's theoretical placement of the laser is correct, in my opinion. While far from a mechanic, I have a 4108 and had temperature problems a while back and I took my readings in several spots but primarily the fresh water pump housing. The highest reading were obtainable there, where water is coming directly out of the engine block.
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