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Old 22-02-2015, 11:50   #16
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Re: perkins 4.108 over heat on high rpm

Did you clean the exhaust elbow? This is often a source of overheating problems.
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Old 22-02-2015, 11:50   #17
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Re: perkins 4.108 over heat on high rpm

I found the sweet spot on my engine to be 2100, or 70% of Max continous.
@1800 the boat would grow a mustache on the transom from soot.
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Old 22-02-2015, 16:39   #18
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Re: perkins 4.108 over heat on high rpm

Quote:
Originally Posted by Uncle G View Post
If it's always done this since you bought the boat - it may need an oil cooler fitting. I marinised an old BMC taxi engine a long time ago and that was fine at low revs, but push it hard and it overheated. Fitting an oil cooler solved the problem completely.

Of course, if it has been OK in the past and is now playing up (or if it already has an oil cooler!) then this won't be the answer.
it has a dual cooler for train and engine oil
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Old 22-02-2015, 16:41   #19
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Re: perkins 4.108 over heat on high rpm

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Originally Posted by DeepFrz View Post
Did you clean the exhaust elbow? This is often a source of overheating problems.
I idly cleaned the cooling tube
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Old 22-02-2015, 16:43   #20
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Re: perkins 4.108 over heat on high rpm

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Originally Posted by Ex-Calif View Post
Thermostat stuck closed?


Do you see any water circulating with the cap off? (Don't open it hot!)
I changed the thermostat
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Old 22-02-2015, 16:47   #21
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Re: perkins 4.108 over heat on high rpm

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Originally Posted by shakey doug View Post
If 2,000 RPM is the max--flat chat in gear revs obtainable it is over propped to blazes ie. OVERLOADED!
that is one thing I thought off
and the only thing that makes sense
but I had the engine out with no prop and when I ran it, it was over heating too
I replaced the fresh water pump and cleaned the tube for the heater .
exchanger and replaced the thermostat and ran it. and it did not over heat running on the ground with no prop
but back in the water on my trip to NY I could not push the throated because it over heats
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Old 22-02-2015, 17:11   #22
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Re: perkins 4.108 over heat on high rpm

Quote:
Originally Posted by mohamedshaheen View Post
Hi I have a 4.108 that works perfectly in fact I have sailed from Norfolk to NY and back and I run the engine most of the times
the only problem I have if I push the rpm over 1600
the engine over heats '230 degree' but then If I push the rpm back down temperature goes back down to 180 degree
I changed the impeller
I cleaned the strainer
the exhaust is pushing enough water so there is enough water for cooling
I cleaned the heat exchanger tube
and nothing seems to work
the engine still over heats on rpm over 1800


any advice would be appreciated

ONLY IT OVER HEATS WHEN IT IS IN GEAR
WHEN ITS NOT ON GEAR IT DOWS NOT OVER HEAT AND THE RPM FO HIGHER
I had the engine out with I ran it, it was over heating WHEN IT INGEAR
I replaced the fresh water pump and cleaned the tube for the heater .
exchanger and replaced the thermostat and ran it. and it did not over heat running on the ground with no prop
but back in the water on my trip to NY I could not push the throated because it over heats
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Old 22-02-2015, 17:32   #23
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Re: perkins 4.108 over heat on high rpm

Well it sounds like something is overloading the engine when in gear.


- Fouled bottom
- Over propped
- Shaft brake?
- Cutlass bearing?
- Transmission binding?

What happens if you tie off at the dock and run it at higher RPM in reverse? Do you get any smoke or other exhaust indications?
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Old 22-02-2015, 17:38   #24
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Re: perkins 4.108 over heat on high rpm

Quote:
Originally Posted by mohamedshaheen View Post
Hi I have a 4.108 that works perfectly in fact I have sailed from Norfolk to NY and back and I run the engine most of the times
the only problem I have if I push the rpm over 1600
the engine over heats '230 degree' but then If I push the rpm back down temperature goes back down to 180 degree
I changed the impeller
I cleaned the strainer
the exhaust is pushing enough water so there is enough water for cooling
I cleaned the heat exchanger tube
and nothing seems to work
the engine still over heats on rpm over 1800


any advice would be appreciated
HERE IS A LINK OF VIDEO OF ENGINE RUNING YOU CAN SEE IN THE VEDIO THAT TEMP WAS CLIMBING TO 200 ON 1500 RPM
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Old 22-02-2015, 18:04   #25
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Re: perkins 4.108 over heat on high rpm

Quote:
Originally Posted by mohamedshaheen View Post
.......I had the engine out with I ran it, it was over heating WHEN IT INGEAR. I replaced the fresh water pump and cleaned the tube for the heater exchanger and replaced the thermostat and ran it. and it did not over heat running on the ground with no prop
but back in the water on my trip to NY I could not push the throated because it over heats
One other thing to check. There is a steel plate between the fresh water pump and the engine, with a gasket on each side of the plate. These gaskets are not identical. In the Caribbean I once had a 'shade tree' mechanic who put two identical gaskets in place, with one gasket blocking a water port; this improper gasket caused overheating.

Note that when everything is correct, the engine should not overheat even when running flat out. After I flew a master mechanic friend to Tortola to fix my engine (he found 5 things right away, and fixed them within an hour), he told me to head from Nanny Cay to Cooper Island with the engine FLAT OUT (maximum RPM). We did so and there was no overheating.

The engine should run at 180-190 degrees.

Bill
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Old 22-02-2015, 18:20   #26
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Re: perkins 4.108 over heat on high rpm

Quote:
Originally Posted by mohamedshaheen View Post
Hi I have a 4.108 that works perfectly in fact I have sailed from Norfolk to NY and back and I run the engine most of the times
the only problem I have if I push the rpm over 1600
the engine over heats '230 degree' but then If I push the rpm back down temperature goes back down to 180 degree
I changed the impeller
I cleaned the strainer
the exhaust is pushing enough water so there is enough water for cooling
I cleaned the heat exchanger tube
and nothing seems to work
the engine still over heats on rpm over 1800


any advice would be appreciated
I have a 4.154 Perkins that had an overheating problem similar to yours - engine would overheat when pushed (to 2350 rpm ; cruising at 2080 rpm). In my case the water injection tee was cracked. Changing this one component had a positive impact on the overheating problem.
However to this day the engine will increase in temperature from 165F to 185F with the same 2080/2350 rpm combo.
Oil consumption and fuel efficiency are also impacted. At 2350 rpm consumption of oil is .75- 1 qt/ 24 hours / 7.2 naut mi / gal; at 2080 rpm consumption of oil is "0"/24 hours/ 10.3 naut mi. / gal.
After 64+ gear head years I can say that engines will often overheat when pushed hard.
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Old 22-02-2015, 18:25   #27
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Re: perkins 4.108 over heat on high rpm

During your troubleshooting try calibrating the tachometer with a RPM measuring device. Then you can better reference the learning here to your specific case.
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Old 22-02-2015, 18:33   #28
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Re: perkins 4.108 over heat on high rpm

I don't think its the prop because you would have noticed this problem before. I think you have water leaking into the jug. is the engine smoking more?
I just read your post saying no smoke. all diesels smoke. take a video of the exhaust running close up and remove and inspect the water jacket, or you will be rebuilding the engine soon. good luck.
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Old 22-02-2015, 22:23   #29
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Re: perkins 4.108 over heat on high rpm

Quote:
Originally Posted by btrayfors View Post
One other thing to check. There is a steel plate between the fresh water pump and the engine, with a gasket on each side of the plate. These gaskets are not identical. In the Caribbean I once had a 'shade tree' mechanic who put two identical gaskets in place, with one gasket blocking a water port; this improper gasket caused overheating.

Note that when everything is correct, the engine should not overheat even when running flat out. After I flew a master mechanic friend to Tortola to fix my engine (he found 5 things right away, and fixed them within an hour), he told me to head from Nanny Cay to Cooper Island with the engine FLAT OUT (maximum RPM). We did so and there was no overheating.

The engine should run at 180-190 degrees.

Bill
hum I think I don't have 2 gaskets
I put this together and I think I had put only one on the engine side..so this one thing to check
thank u
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Old 22-02-2015, 22:28   #30
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Re: perkins 4.108 over heat on high rpm

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Originally Posted by gah964 View Post
I don't think its the prop because you would have noticed this problem before. I think you have water leaking into the jug. is the engine smoking more?
I just read your post saying no smoke. all diesels smoke. take a video of the exhaust running close up and remove and inspect the water jacket, or you will be rebuilding the engine soon. good luck.
I have a video posted up there for the engine running
please have a look at it. as for me I dint see smoke.
why wouldni have to rebuild the engine if it does not smoke?
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