Join Date: Feb 2000
Location: Annapolis, Md
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Re: Kanzaki transmission questions
Rich's points, and particularly about alignment, are worth heeding. To add to the discussion, I think that I have the a similar engine (3GM 30) but the same transmission. I just pulled my engine out last month and removed the transmission to replace the main crankshaft seal on the engine.
A couple thoughts here, first of all, my boat has always had a certain amount of gear whine when in gear, but not very loudly. But fi yours is pretty loud, then my next suspicion would be with the damper plate. There is a tendency to put the damper plate in backwards. If you don't know better, and if you hold the damper plate in your hands and look at where it is installed, or look at the engine manual, it is easy to think it goes in facing the wrong way. I am told by a reputable mechanic that if it is installed facing backwards, it will make noise and it will damage the transmission over time. As an amateur mechanic, I had forgotten to mark which side of the plate faced out, and so I almost installed it facing the wrong way.
If your boat has always made that noise, it would make sense to try to find out if the transmission has ever been removed from the engine. If the transmission has been removed, as much as I hate to say this, you may need to have a mechanic remove the transmission and check the damper plate orientation.
Second, it is very critical to use the right oil (single weight SAE 30) and fill the transmission oil to the correct height; no higher and no lower than the marks. Absent that, the transmission will not engage properly and may make noise.
Check the shift linkage and make certain that it fully engages the transmission into gear in both directions. That should be checked periodically since the adjuster on the cable system is a pretty crude clamp and can slip over time. Failure to properly fully engage the transmission will cause wear and noise.
Mine also has a distinctive clunk when it goes into gear which I am told is normal and a sign of a healthy transmission.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay