Serp belt drive noise?

[ittlfly]

John, did you spin up the alt with a socket on the end of a drill yet? It sure worked for me in diagnosing my last alt problem. As bad as that nosie is it should be easy to hear.

[Rex Ruby]

Well I couldn't get a socket with a drill on it, too much in the way.
So I came up with the idea of getting a heavy rubber band and using that as a mini fan belt on the drill. Barely heard maybe a noise when I did this to the alt. Tried to use a belt I had from my snow blower, wrapped it around the WP and it almost but not quite worked. So I decided to proceed with R&R the alt. About half way out I notice this:


Checked the underside of the air horn and saw this (excuse the poor pic, old shakey hands)


So a bent fan is the culprit. Now what to do. Could it have flexed that bad being exposed to some high RPMs? When I installed this alt last Aug I thought the "fan" looked cheaper than the orig. I'm almost afraid to warranty it, the "fan" will be the same flimsy crap. The original one fits on the replacement alt. Now there's always something, the orig pulley is slightly larger, which pulley would you put on?

Broke the *##%** tab on the big connector to the alt, epoxied it back on looks like it worked, always some BS! I must be getting old I don't remember having to take all this off the do the alt back in August! Here how she's sitting until tomorrow evening:

[tomtom72]

isn't it a shame when you pay for parts & you can't even rely on the stuff being accurate!

Something don't add up here John. Check the diameters of both fans as it don't make sense that the replacement should hit the A/Horn. Or at least it don't make sense to me if the part is "by application" in the parts book. Is there a way to put the alternator in too high? That's another way the fan could hit the A/Horn.

You want to borrow a ZR-1 alternator? I bought Dom's alternator from his part out. I know it's an LT5 alternator. If you know a good rebuilder that can be trusted you can use my spare, have your OE one rebuilt and then have my spare rebuilt & I'll pay you. I can deliver it too!


Tom

[-=Jeff=-]

Originally Posted by -=Jeff=-

Well you could install your other alt to see if the noise cures itself, also with the belt off, try to check for play on the WP pulley..

it sounds like an impeller or fan is scraping on something..

See, I knew that sound at least.. LOL

[GOLDCYLON]

Originally Posted by GOLDCYLON

It sure sounds like and alt fin binding or scraping? If its the WP thats the worst I have ever heard. My money would be on the alt.GC

Looks like we both called it Jeff

[GOLDCYLON]

Originally Posted by tomtom72

isn't it a shame when you pay for parts & you can't even rely on the stuff being accurate!

Something don't add up here John. Check the diameters of both fans as it don't make sense that the replacement should hit the A/Horn. Or at least it don't make sense to me if the part is "by application" in the parts book. Is there a way to put the alternator in too high? That's another way the fan could hit the A/Horn.

You want to borrow a ZR-1 alternator? I bought Dom's alternator from his part out. I know it's an LT5 alternator. If you know a good rebuilder that can be trusted you can use my spare, have your OE one rebuilt and then have my spare rebuilt & I'll pay you. I can deliver it too!


Tom

Tom I dont think he needs one

Originally Posted by Rex Ruby

Got a new pulley installed, put the serp belt on and still have the same noise.
Sounds like the alternator, definitely coming from that side but hard to pin point.
Going to put my old alternator in and see if it's the alternator and go from there.

In Post 16 I suggested


Get your old alternator rebuilt first would be my suggestion. You where going to go there anyway. This way its done in One. GC


The good news story is you figured it out!!!

[GOLDCYLON]

Originally Posted by Rex Ruby

Broke the *##%** tab on the big connector to the alt, epoxied it back on looks like it worked, always some BS!

Dont feel bad. Your dealing with 21 year old harnessing. When I R&Red my alterator I broke the battery lead. Why? Because the back stud and nut broke and was spinning inside the alternator. You want to talk about some *##%##" I still need to get that alternator rebuilt.

[z proud]

John,

I also have a used alt if you need one to use, have the gaskets if u need them for the air horn, or TB

I will PM, you my cell# if you need anything,,,,,,,I only have 4 bins of spare parts

[Rex Ruby]

Originally Posted by z proud

John,

I also have a used alt if you need one to use, have the gaskets if u need them for the air horn, or TB

I will PM, you my cell# if you need anything,,,,,,,I only have 4 bins of spare parts

Thanks Bill, I think I have everything I need to put it back together.
Tomorrow or Saturday I'll get it done and report the results

[Rex Ruby]

Got everything back together BUT
broke what I assume is the oil sending unit.

It's about 2.5" long, 3/4" dia, has a wire connection and is between the alt and oil filter.
Screws into the base thats part of the oil filter mount.

Any idea who stocks these sending units?