1990 GTZ - "chattering" chain noise, water pump/idler?

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GTU89
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Re: 1990 GTZ -

Postby GTU89 » Wed Nov 12, 2014 2:37 pm

Figured I'd just put this here instead of the above post. The water pump sprocket looks considerably worn after close inspection. Not to the point of worrying but the teeth are definantly worn down. Could that be any of the noise or no since it mainly slaps on the front and top?


1990 Chevrolet Beretta GTZ - 2.3 Quad 4 HO/5 Speed - 141xxx
2003 Ford Mustang - 3.8 V6/5 Speed - 182xxx
1994 Ford F150 - 4.9 300 I6/Auto - 169xxx
1971 Pontiac Lemans Sport Coupe - 7.5 455 V8/Auto - ~45xxx

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1988GTU
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Re: 1990 GTZ -

Postby 1988GTU » Wed Nov 12, 2014 4:41 pm

GTU89 wrote:maybe but there is a handful of NOS chains on ebay last time I checked. No tensioners I found though.

I have a new never used single row tensioner somewhere. I had the idea of going to a single row until I found all the NOS oem GM stuff to keep it simply dbl row as intended.


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1988GTU
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Re: 1990 GTZ -

Postby 1988GTU » Wed Nov 12, 2014 4:43 pm

GTU89 wrote:Figured I'd just put this here instead of the above post. The water pump sprocket looks considerably worn after close inspection. Not to the point of worrying but the teeth are definantly worn down. Could that be any of the noise or no since it mainly slaps on the front and top?


It could contribute to excessive chain tolerances with the potential to mess with timing.


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Re: 1990 GTZ -

Postby SuzukiGhostRider » Thu Nov 13, 2014 1:45 am

Sounds like your chain may be stretched. If it's leaving marks in the housing.


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GTU89
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Re: 1990 GTZ -

Postby GTU89 » Thu Nov 13, 2014 2:20 pm

So chain. tensioner and waterpump + sprocket (if I can find one with a sprocket. or are the aftermarkets bad too? my gtu's new one went out pretty quickly) and it should be good?

Tensioner looked fine but probably not worth stretching a new chain?

Anyone know the specifics of checking the pitch of the chain to test for stretching?


1990 Chevrolet Beretta GTZ - 2.3 Quad 4 HO/5 Speed - 141xxx
2003 Ford Mustang - 3.8 V6/5 Speed - 182xxx
1994 Ford F150 - 4.9 300 I6/Auto - 169xxx
1971 Pontiac Lemans Sport Coupe - 7.5 455 V8/Auto - ~45xxx

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Re: 1990 GTZ -

Postby 3X00-Modified » Thu Nov 13, 2014 3:35 pm

I've been "told" that chains don't actually stretch... They wear and produce slack from increase tolerances. For me identification that my chain was crap was rather easy... side by side comparison.

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I was "told" this chain simply wore out and just appears to be stretched because of the lack of oil grooves in the sprocket to lubricate it. This was my TCE DR timing set... I thought the chain stretched because of how it fit into the sprocket aka improper pitch cut on the sprockets but I'm being told it isn't stretched because of that fit it's just worn because it didn't get any oil. I'm still afraid to use the replacements I received that now have those grooves for oil.



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GTU89
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Re: 1990 GTZ - "chattering" chain noise, water pump/idler?

Postby GTU89 » Fri Nov 14, 2014 8:17 am

interesting, ill have to compare my stock stuff to the aftermarket stuff and see what (if any) differences there are.

god aftermarket quality seems to be pathetic!

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1990 Chevrolet Beretta GTZ - 2.3 Quad 4 HO/5 Speed - 141xxx
2003 Ford Mustang - 3.8 V6/5 Speed - 182xxx
1994 Ford F150 - 4.9 300 I6/Auto - 169xxx
1971 Pontiac Lemans Sport Coupe - 7.5 455 V8/Auto - ~45xxx

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SuzukiGhostRider
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Re: 1990 GTZ -

Postby SuzukiGhostRider » Sat Nov 15, 2014 3:50 am

It IS pathetic.....


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