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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 06-08-2014
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Squeel while in gear

1983 Cal 3-27. Yanmar 1GM.

I've had this problem intermittently for a while, but it has suddenly gotten quite bad. Early on, on rare occations, a terrible squeel could be heard shortly after putting the transmission in gear. On those occations it could be stopped by throttling up.

Now, it happens every time the transmission is in gear and it can't be stopped.

Thinking it was the stuffing box I loosened it up to the point that it drips even if the prop isn't spinning but that hasn't helped.

My next step is going to be to replace the packing gland.

Do you have any other ideas as to cause and solution?

Thanks,

Matt
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Old 06-08-2014
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Re: Squeel while in gear

Have you checked the oil level and condition in your transmission? Does the oil smell burnt?
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Old 06-08-2014
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Re: Squeel while in gear

Slipping clutch?

Cable adjustment?

Are you sure it is in the transmission? Have you eliminated the alternator/alternator belt as a potential cause?
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Re: Squeel while in gear

I've just checked my maintenance records and it's been an embarassingly long time since I've changed the transmission oil or packing gland. I'll do both today and report back.

I'm pretty sure that it has to do with the prop shaft spinning - transminssion, packing gland, something else. It doesn't happen at all out of gear, no matter the rpm.
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Re: Squeel while in gear

check your shaft alignment
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Old 06-08-2014
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Re: Squeel while in gear

I'd say that you need to narrow it down to either transmission or shaft or something else. I'd start by uncoupling the transmission from the shaft.

As James mentioned it could also be an accessory belt, common cause of squeals.

The fact that it used to stop when you throttle up suggests the tranny but you really need to confirm before you can go farther into the diagnosis.

FWIW I had the same symptom, squealing that would stop when throttled up. In my case it turned out to be slipping clutch.
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Re: Squeel while in gear

Good ideas. Thank you.

I went under the boat and found the prop difficult to turn by hand.

I opened the stuffing box and found less water than I expected coming in, but my expectations lack experience, so I don't know if I'm right or not. Witness the water ingres for yourselves:


I unbolted the prop shaft from the transmission, but the shaft and transmission still turned together. So, I went back under the boat and twisted the shaft while pulling out and created some separation. I still found the prop difficult to turn. With the shaft and transmission completely separate and engine on and in gear it sounds lovely. I surmise a shaft problem.

What wisdom does the collective have to offer?
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Re: Squeel while in gear

Ok good. so I think you can rule out the transmission and accessories.

Sounds are hard to explain on a forum (one mans squeal is another mans squeak) but at this point the source of the noise is either
- stuffing box (although I've never heard a stuffing box squeal)
- cutlass bearing
- anything else?

Have you considered removing the old packing and re-packing the stuffing box? Its an easy and inexpensive experiment. Keep in mind it's a dicey proposition to do it with the boat in the water, but it can be done. If you do, I'd wrap the shaft (with a rag or something) from the outside and make sure the bilge pumps are working before starting.

I'd say that The amount of water you have coming in with the stuffing box nut loose is normal. Expect a lot more to come in if you remove the packing.

And in regards to the friction that you feel when spinning the prop (again that's hard to describe on a forum), that might suggest the cutlass bearing as the culprit.

Btw can you post a video that includes the sound of the squeal?
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Re: Squeel while in gear

It's a squeal. Long, never ending, blood curdling squeal. A holy-crap something-is-bad-wrong-make-it-stop-now squeal.

I can't provide a video with the audio of the squeal for a while. It's going to take me a little while to bolt the shaft back to the transmission, and my weekend is over.

However, I did put the transmission in gear with engine running and no packing at all in the stuffing box and it still made the noise. Ergo, it's not the stuffing box.

Looking at the video I posted, if you move aft (which I have no video of) there's what looks to me like radiator hose. It's got double hose clamps at each end. What's in there?
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Re: Squeel while in gear

That's the stuffing box hose, there is nothing in there except sea water. it's the hose that seals the stuffing box to the shaft log.

You've done all the right things here and it sure sounds like you've narrowed it down to the cutlass bearing.
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