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Birm

Question about shaft spinning

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Birm

Today I changed my prop-put on the new OJ475 Clap.gif. Anyways, when I spun the shaft by hand it seemed really tight and made kind of a screaching noise. There is a shaft support which is mounted to the hull. There appears to be a brass sleave with some sort of black teflon or plastic that the shaft goes through. The sleave is prevented from rotating in the support by two set screws. Anyways, it looked like the sleave might have been spinning, and the front set screw was loose, so I tightened it. This prevented the sleave from spinning, but the screaching noise was still present when I spun the prop. Where I keep my boat there is a Mastercraft right next to mine. I spun his prop by hand, and it was really smooth and quiet....although his prop was pretty meager in size and quality compared to the new OJ or my old Acme! Thumbup.gif His prop was much smaller and appeared to be cast brass compared to CMC machined. His prop bolt was also missing the cotter pin-should I do a good did and tell him-put one in for him? Anyways, I digress- There is also a Malibu V-ride at my storage. I went over and spun his prop as well. It screached like mine, and was also definitely less smooth than the Mastercraft. Dontknow.gif So, what gives? Is this normal...should I be concerned? Is this just the way Malibu's are? I'm heading out tomorrow, so I really hope that I don't have a problem here. I'm looking for a little input from the crew. If any of you have your Bu's close by can you go out and check this out for me.

I appreciate it. Thanks!

Edited by Birm

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colobuskier
Today I changed my prop-put on the new OJ475 Clap.gif. Anyways, when I spun the shaft by hand it seemed really tight and made kind of a screaching noise. There is a shaft support which is mounted to the hull. There appears to be a brass sleave with some sort of black teflon or plastic that the shaft goes through. The sleave is prevented from rotating in the support by two set screws. Anyways, it looked like the sleave might have been spinning, and the front set screw was loose, so I tightened it. This prevented the sleave from spinning, but the screaching noise was still present when I spun the prop. Where I keep my boat there is a Mastercraft right next to mine. I spun his prop by hand, and it was really smooth and quiet....although his prop was pretty meager in size and quality compared to the new OJ or my old Acme! Thumbup.gif His prop was much smaller and appeared to be cast brass compared to CMC machined. His prop bolt was also missing the cotter pin-should I do a good did and tell him-put one in for him? Anyways, I digress- There is also a Malibu V-ride at my storage. I went over and spun his prop as well. It screached like mine, and was also definitely less smooth than the Mastercraft. Dontknow.gif So, what gives? Is this normal...should I be concerned? Is this just the way Malibu's are? I'm heading out tomorrow, so I really hope that I don't have a problem here. I'm looking for a little input from the crew. If any of you have your Bu's close by can you go out and check this out for me.

I appreciate it. Thanks!

On the 3 inboards I have had they all screeched when dry and the shaft was spun. It really squeals when you put it in gear by mistake!!!!! Whistling.gif Stops when you spray water on it :unsure: Do't think there is anything to worry about here as I believe the water lubes the prop support.

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M3Fan

The screeching noise is completely normal as colobu skier mentioned.

The brass sleeve with the rubber interior is a cutlass bearing. It is an interference/press fit within the strut housing. The set screw is practically overkill as the bearing should be very tightly housed within the strut. Typically you have to put the cutlass bearings in the freezer to shrink them down a thousandth or so, if that, and press them into the strut using a mallet or press tool. I'd be concerned that your cutlass bearing (AKA Strut Bushing) is spinning freely in the strut without the set screw being tight. There is zero/negative tolerance between those two parts. Typically they have to be hammered out with a slide hammer or cut in half to remove them, as I've learned first hand.

Edited by M3Fan

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Birm

Thanks guys! The breadth of knowedge on this site never ceases to amaze me. I love this place. Thumbup.gif

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vette-ski

Squirt some water in there and spin it again. You'll notice a big difference.

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