Screech in lower unit

Boatbroketoo

Cadet
Joined
Nov 6, 2005
Messages
6
I had the bad luck to strike an abandoned crab pot with my '02, 115 Yamaha 4-stroke. After about 30 minutes of wire sniping, of got the prop cleared and limped home. I replaced the dinged up prop with a Michigan Wheel. At about 1200 rpm, the lower unit makes a loud squeal much like a bearing that is burning out. I touched up the old prop and put it back on and the noise is about 90% better. I put on an oem stainless steel prop and again there is only a trace of noise. Do you think I am doing damage to the lower unit? I would hate to pay the dealer to break it down to be told that they found nothing.
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Screech in lower unit

Taking a Boat in for Service 101...<br /><br />Don't tell them what to do, tell them what is wrong. Every now and then I get customers tell me to do this or that and it doesn't always address the problem. I recall one guy that wanted his carbs rebuilt. I did the usual compression and spark check and found one cylinder had no spark. So I called him and asked "Do you want me to rebuild the carbs, or fix the problem?" Tell them the symptoms and the circumstances and let THEM find the problem.<br /><br />Believe me, there are a lot of shops that would've rebuilt the carbs, collected their money, and sent you on your way only to be pissed off that the motor ran just the same as when it was taken in. Once you sign the work order, they're stuck with those instructions. But they end up with a dissatisfied customer and the customer is out money that was wasted on something that didn't need to be done.<br /><br />Now this customer wasn't happy that the repair that NEEDED to be done was more expensive than what he WANTED done. But he'd have been a whole lot more upset if I had rebuilt those carbs AND ended up doing the switchbox the next week. You never know, they just might find that it's nothing more than a missing thrust washer that went kerplunk unnoticed allowing the prop to rub on the gearhousing. Easy repair, not expensive part ... and a whole lot cheaper than a teardown. Heck, most shops wouldn't even charge for their time in that circumstance, just the part. :)
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: Screech in lower unit

what willy says, especailly about the thrust washer.
 

Boatbroketoo

Cadet
Joined
Nov 6, 2005
Messages
6
Re: Screech in lower unit

Thanks Willey and Rodbolt for your quick response. You are right Willey, I would never tell a shop what to do. When I questioned a Yammie mechanic his response was, "I can't really tell you anything until I break it down." I want to avoid that. The thrust washer is a good lead. I noticed where was some carbon built-up on it. I figured that might be from the long no wake zones I pass going out and coming in.
 
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