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1999saturnsl 06-19-2018 10:38 AM

Scraping noise in 99 sl engine
 
Hey y'all,
I tightened up the tensioner and replaced the water pump last week, and now I've got this metal scraping noise in my engine. Real bad when I start up, and sometimes shows up again at stoplights. S Belt?

toggenburg 06-19-2018 11:52 AM

Re: Scraping noise in 99 sl engine
 
Er, how did you 'tighten up' the belt tensioner?

Usually, they are cheap enough that they are just out right replaced, not repaired or 'tightened up'.

There are several fans here who have rebuilt theirs with new bearings, is that what you meant?

Perhaps, the tightening process you did, has not lasted and that tensioner is now causing the noise?

alordofchaos 06-19-2018 12:09 PM

Re: Scraping noise in 99 sl engine
 
On a cold engine, remove the belt and start the car. If the noise is gone, it's either the belt or tensioner. You can run the car for a minute or so with the belt off, but probably won't need more than a few seconds.

Some of the aftermarket tensioners have slightly different diameter pulleys and require a slightly shorter belt. You can measure yours - I think the stock size has been posted somewhere here

1999saturnsl 06-19-2018 12:17 PM

Re: Scraping noise in 99 sl engine
 
I just gave it a couple twists of a ratchet, as I thought that was the thing to do..is that not suggested?

alordofchaos 06-19-2018 12:42 PM

Re: Scraping noise in 99 sl engine
 
1 Attachment(s)
Now I'm even more confused :D

What did you tighten, exactly? There are three bolts total.

Two of them (10mm?) are for mounting the tensioner and you should not have been able to tighten them much (red lines).

There's one bolt for the pulley (blue line) and all that does is release the tension so you can remove the belt. I think it's 13mm~14mm. Did you hold the pulley down and tighten that?

1999saturnsl 06-21-2018 02:34 PM

Re: Scraping noise in 99 sl engine
 
Yes, I turned the blue one

alordofchaos 06-21-2018 02:52 PM

Re: Scraping noise in 99 sl engine
 
Normally, when you put just a wrench on that and turn, the whole pulley moves (it's how you release tension on the belt to remove it)

If you held the pulley still and then turned the bolt . . . we're in uncharted territory here. I've never heard of anybody doing that before
(congratulations, I guess? :))

Because I'd be worried about damage from tightening that bolt, I'd replace the whole tensioner. The pulley is supposed to spin freely

If I didn't have the money to replace it, I might try and do the same thing in reverse . . . hold the pulley still and back the bolt out [I]exactly [/I]as much you tightened it.

Good luck, tell us how it goes

1999saturnsl 07-27-2018 04:08 PM

Re: Scraping noise in 99 sl engine
 
Brought a more mechanically-aligned friend over, who said the tensioner was out of place, lower than it should be. Suggested replacement. Thoughts?

toggenburg 07-28-2018 07:02 AM

Re: Scraping noise in 99 sl engine
 
On 6/19 I mentioned "Perhaps, the tightening process you did, has not lasted and that tensioner is now causing the noise?" ='s replacement needed.


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