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Start of attached email. Subject: Engine damper
This noise started after i had the v-drive rebuilt. Something to do with the uneven firing of a 6 cyl diesel and not having enough “holdback” or preloading aka tires on ground vs a propellor in the water. Springs in the damper plate not adequate.
As I said before I ordered a stock damper plate and installed it while the was engine out. Which is a whole other story. Had the v-drive rebuilt at the same time and when I started the engine up there was a loud metallic clanging that disappeared at higher rpm’s. I finally determined it was the damper plate, the new one that I had put in. so I purchased the special one from PYI.
Alanhttp://www.pyiinc.com/images/pdf/rd/R&D%20Damper%20Plate%20Catalog.pdf
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Hello again Phil,
You mentioned that your issue might have something to do with the six cylinder engine. If that indeed was the cause, perhaps a standard Perkins/Westerbeke damper might work. I think the price on the PYI/R&D is around eight bills. The damper ordered by my rebuilder is $150. I still plan on talking to him about this, but it might be worthwhile for me to try the cheaper option.
Pulling the engine up not too big a hassle for me. But it would certainly have been a major job it I hadn’t replaced the engine mounts about six months ago. Now that was a job! The aft (engine aft, not boat aft) mounts were a real bear. Took a sawz all and several broken drill bits to get them out. Anyway, since they are new, it was easy to spin off the nuts.
David
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