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Old 27-06-2010, 15:48   #31
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I will check (as DeepFrz recommended) the heat exchanger. an engine at that age is likely to have a leak between the raw water and the coolant system and this in turn will cause the whole cooling passages to clog up.
If the heat exchanger is the culprit I recommend canging it to a larger exchanger as it looks like ther is a desigh flaw in this engine and "johnar" indicated
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Old 27-06-2010, 17:38   #32
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Sure sounds like a back pressure (exhaust elbow) to me...thus far.
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Old 29-06-2010, 04:50   #33
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I like the idea of the larger heat exchanger. Anyone have part numbers for a larger heat exchanger that will fit without many modifications to the existing setup?
I will be checking the idle as well as that sounds like it would impact the way the engine throttles under idle and load.
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Old 29-06-2010, 06:22   #34
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Sure sounds like a back pressure (exhaust elbow) to me...thus far.
I second the above due to no load no rev. Heat is building due to blockage not the cause of problem as heat cannot rise instantly. If the exhaust is blocked the higher the RPM the more flow capacity is required so this would fit the symptoms supplied. As you indicated it idles okay. Good luck
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Old 29-06-2010, 07:49   #35
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Either the exhaust is blocked, or the tach is way off--are you saying that it gets to the same maximum rpm whether loaded or not??
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Old 29-06-2010, 09:27   #36
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I will also jump in with the exhaust elbow being blocked or at least restricted.

I have had this problem before and as a TEMPORARY fix, with the engine running at about half speed in neutral, tapped on the elbow with a small ball pean hammer starting nearest the exhaust exit and working back toward the engine. This helped for a while by knocking loose a lot of the crap/rust/carbon. By starting downstream and working up most of what came loose was washed out the exhaust port.

When I got around to fixing it properly( you did see TEMPORARY?) I had to flush out my muffler as a lot of the rust and crap was heavy enough to stay in the bottom of the muffler.

Now, of course, y'all have made me paranoid that my water pump impellor needs to be changed just as we are going on our vacation. I may have to work on it before we go. Just to make ME feel better............m
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Old 29-06-2010, 19:13   #37
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When Cast iron rusts...it expands(scale)....This is enough to close off water passages and decrease inside diameters of elbows.
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Old 29-06-2010, 19:40   #38
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If it runs at 2,000rpm at WOT in neutral and under load the govorner is the controling factor, perhaps the govorner adjusting screw was turned instead of the idle adjustment?
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Old 29-06-2010, 22:07   #39
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If it runs at 2,000rpm at WOT in neutral and under load the govorner is the controling factor, perhaps the govorner adjusting screw was turned instead of the idle adjustment?
I do not think that would account for the overheating back to the exhaust blockage
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Old 30-06-2010, 20:56   #40
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4108 low rpm

Have you checked the stop lever is returning fully to the fuel ON run position?? ie hard fwd.
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Old 05-07-2010, 09:47   #41
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A quick update, I managed to removed the exhaust pipe and elbow...WOW!!!
I was shocked to see that the "Home Made" mixer elbow was totally blocked (99%). I also removed the Heat Exchanger to find it full of Seaweed. This was a total shock for me. I am, though, very very excited with the find. I have a original replacement for the mixer elbow and will need a new exchanger.
Should I buy a biggger heat exchanger? If so, any ideas of which one or how much bigger?
Thanks a lot for all your help to date.
Ivan
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Old 05-07-2010, 10:03   #42
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Can't you just

"Rod" out the heat exhanger?

Sea weed?

You probably don't need a new exchanger.....a decent, easily accesible strainer should work

Quote:
Originally Posted by Chief Engineer View Post
Sure sounds like a back pressure (exhaust elbow) to me...thus far.
Quote:
Originally Posted by Chief Engineer View Post
When Cast iron rusts...it expands(scale)....This is enough to close off water passages and decrease inside diameters of elbows.
Quote:
Originally Posted by ivndrago View Post
A quick update, I managed to removed the exhaust pipe and elbow...WOW!!!
I was shocked to see that the "Home Made" mixer elbow was totally blocked (99%). I also removed the Heat Exchanger to find it full of Seaweed. This was a total shock for me. I am, though, very very excited with the find. I have a original replacement for the mixer elbow and will need a new exchanger.
Should I buy a biggger heat exchanger? If so, any ideas of which one or how much bigger?
Thanks a lot for all your help to date.
Ivan
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Old 05-07-2010, 11:15   #43
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Check your raw water strainer as well

I'm glad to know that you found all that crud - that sounds like the core of the problem (to this newbie, anyway). Now you have to figure out how all that seaweed got in there - I expect that your raw water 'strainer' isn't.
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Old 05-07-2010, 12:37   #44
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Aloha,
I'm glad you found the problem. I don't think you need a larger heat exchanger but that's just my opinion. Would it cost you more to install a larger version? Can you just clean up the one you have?
Good luck in your repair.
regards,
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Old 06-07-2010, 07:17   #45
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Ivan, Bill Trayfors had to install a larger heat exchanger on his 4108. I think he used one from the next larger Perkins angine, probably a 4154 but I'm not sure. Maybe PM Bill.

Glad you finally checked that exhaust elbow.

You probably don't need a new heat exchanger, unless yours is corroded badly.

Good luck.
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