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| Kermath Model 20, how to ballance. |
| Author |
Message |
    
Jim Hassfeld
| | Posted on Tuesday, January 28, 2003 - 10:04 am: | 
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Need help on a model 20, 25hp Kermath 4cyl, sn#
39454. The engine was rebuilt about 4 yrs ago and has about 10 hrs on it. It is in a 26' Lawley launch and runs fine but with much vibration. We have covered all the standard things, shaft alignment, cutlass bearing and all the usuall suspects, and only reduced the vibration. The engine is hard bolted to the engine beds and it is obvious that a certain amount of vibration will always be there, unless we resort to a modern mounting system. This will alter the boat way beyond what I want to do, so what is next. I suspect that much of the vibration comes from the flywheel. There are no signs that any attempt to ballance was ever done. Does anyone have any thoughts on how to ballance what amounts to a 200lb pizza? We have considered a tire ballancer, but the jury is still out. The car racer types say they can't help. One other posibility is that durring the rebuild, the flywheel was not bolted up to the crank indexed the same way. There is a six bolt flange, with no keyway or other way to
solve this. We did find some marks on the outside
perimiter of the flywheel, but there is nothing. to line them up to. Any help or ideas would be greatly apreceated. Jim Hassfeld. |
Ernie
| | Posted on Tuesday, January 28, 2003 - 12:20 pm: |
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Jim,
If the flywheel will even fit in any other position, I would suggest giving it a try. For sure mark where it is now. Then try it in any other position that it will fit. Make sure to refrence each one so you don't try it twice and make sure you can put it back the way it is now (incase you make it worse) Assuming that it is flywheel forward it should not be to difficlut to try this. Except for the weight. I don't know of any manuals available for this engine.
Hope this helps
Ernie |
solarrog
| | Posted on Tuesday, January 28, 2003 - 12:53 pm: |
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Jim this is a long shot, I have never worked on this model engine, I have worked one thousands of others though. Is it possible that the number one cylinder should be at TDC with the marks on the flywheel at the top. Some other engines deal with it this way. Best of luck. You project is a interesting one. Vibration has raised its ugly head on many projects in the past.
Roger DiRuscio
Fremont,Ca USA |
George Powell
| | Posted on Friday, May 30, 2003 - 05:46 pm: |
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I have a 1946 Matthews originally powered with (110 HP) Kermath Sea Chief specials with 2:1 reduction gears. They were replaced with Perkins 6.354 diesels and moved as far forward as possible to attempt to account for the change in weight.
Can anyone give me a weight for the Sea Chief so I can calculate the effect on balance trim?
Thanks, George Powell |
jim
| | Posted on Wednesday, March 03, 2004 - 01:54 pm: |
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According to Kermath engine catalog, the Sea-Chief special eight wtih 110 hp high speed weighed in at 860 with iron base, 930 with iron standard reduction gear and other reduction gears were "slightly heavier" |
Richard Day
| | Posted on Wednesday, March 03, 2004 - 05:36 pm: |
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One thing I would look into is the vibration present when the engine is not driveing the prop? I had a terrible vibration problem with a repitched prop and it turned out the prop had been the real source of the vibration after it was repitched a second time. |
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