Chirping sound

[Racer X]

What I want to see is a picture of the backside of the sprocket. When mine went, the back was worn by all the movement against the shoulder on the crankshaft, as well as the keyway damage.

 

[Bizzy]

I'll clean the crank up as well as the dampener and gear and take some fresh pics.

Fred, just to be on the safe side I'll say "go" on the parts. Worst case is I end up with some spares and that's never a bad idea.

 

[sho'd]

what exactly causes this to happen?

 

[Racer X]

what exactly causes this to happen?

By most accounts, not tightening the crank bolt sufficiently.

 

[Bizzy]

Pics:

Some pics you can click the picture for high resolution views. Warning, the high resolution images are VERY big, not that the small ones are exactly small.









This is my area of concern. I'm not sure if it's just the view but it sure looks worn in this area to me. When I place the key in place, there appears to be a gap on the left hand side of the key. But again, it may just be the way I placed the key combined with the lighting direction that makes it appear that way. The key does not seem to wobble at all when I put it in place. I may not have placed it properly, keep in mind that this is the very first time I've ever touched this stuff before. I've watched others do it before but never done it by myself.

Also, the splines on the crank seem to be worn closer to the block compared to those closer to the snout of the crank.

P.S. Fred, I've got no way to measure the keyway. I have a cheap caliper but I fear that it's not very accurate. I'll give it a go and find out though.

 

[Bizzy]

I measured the new key that I have with my cheap dial type caliper and it reads 5.185mm.

The front (snout side) of the keyway measures about 5.192mm

The middle of the keyway measures about 5.19

And the rear (block end) measures about 5.20. It was hard to get the caliper in there to measure so it may be slightly off because of the angle of the caliper. There's no real good way for me to get that in there to get a really accurate measurement. Plus my caliper is really cheap. I would not depend on those measurements being 100% accurate.

 

[Yamaha V6]

Picture shows everything you need to know. Crank's toast, so will gear & likely the dampener as well.

I'll see if I can get to the UPS store this afternoon for you, but you'll chew through the new pieces ASAP too (like within a week or two, depending on mileage; I got about 300 miles out of a set on my 89).

http://shoforum.com/blueberry/crankkey6.jpg shows the gap. As for the "splines", it's markings from the inside diameter of the crank gear is all, if I understand what you're referring to.

Sorry for the news Bizz, but unless you get her to Mexico City for some radical under-the-table voodoo treatment, the crank's a goner. If you want to try what was rigged up on the old 89, I'll be happy to go through it with you. It wasn't pretty, but it held long enough to take posession of my blue ATX to replace her. With 1 set of hardware, you may want to consider it, unless you have a donor engine within reach.

 

[Bizzy]

That's what I figured Fred. If you could get those parts out that would be great, we may as well get the dampener too. But don't break your neck in doing so. I've got a little time to play with before I go north of the border for a radical voodoo treatment that I hope will help. But that will be after the convention. Even if it doesn't work permanently, hopefully it will buy us (read = my son John) enough time to either find a donor motor for the car or find him another car.

Edit: PM or email me how much I owe you and your paypal ID.

 

[SHOtimer]

I don't remember if it was on here, shotimes, or baysho mailing list, but I remember a guy (a few years ago) had slight damage to his crank like you do. He bought a set of feeler gauges and picked out the right sizes and cut them down to the proper size and filled in the gap so that the key way was nice and tight. Last he had reported he had +75k on the setup and it was still good. A thought.

Here it is, it was on shotimes.

http://www.shotimes.com/php-bin/modules.php?op=modload&name=News&file=article&sid=247

Doug

 

[Yamaha V6]

Yeah George F did that, and that's definitely something that is worth trying, though I think it depends on the draft angle of the worn area of the crank as well. Mine was worn far enough that it was not effective, nor was JB, real weld fill, sleeve-retainer loctiting the crank gear to the crank, etc etc

On the house Beth. We gotta watch the back of the Dragon Leader.

 

[Shoaz]

On the house Beth. We gotta watch the back of the Dragon Leader.

Kudos to ya for that, Fred.

 

[Bizzy]

God love ya Fred.

 

[Bizzy's Boy]

I just wanted to make sure that I said Thank You to everyone that is helping me. I appreciate everything you guys are doing. Advice + helping me find parts. Thanks

John