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serpentine belt tensioner/idler replacement

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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misha
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Year and Model: '97 850 2.5 20v
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Re: serpentine belt tensioner/idler replacement

Post by misha » Thu Mar 03, 2016 4:24 pm

I'm pretty convinced that it have needle bearing instead of ball bearing,but not sure because there are different bearings in serpentine idler rollers.
Could be also a regular little ball bearing.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

PeteB
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Re: serpentine belt tensioner/idler replacement

Post by PeteB » Thu Mar 03, 2016 7:46 pm

Thanks, I'll probably just buy a new idler roller.

PeteB
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Re: serpentine belt tensioner/idler replacement

Post by PeteB » Wed Mar 09, 2016 10:37 am

A few tips on removing the serpentine belt on an 850, it sure is tight in there.
One thing to note is that the belt diagram in our owner's manual showed the
belt routing for the "older short" belt but the one on the car was the later,
longer type and was routed differently as shown here:
VOLVO-SERP.jpg
I didn't have a tensioner wrench and didn't feel like going underneath the car
to do it so I wrapped a 1/2" wide strip of aluminum flashing around a half inch
breaker bar end, tried it on a socket wrench and there was just too much
material to clear and get it in place. Worked with the breaker bar and I held
the aluminum shim in place with electrical tape - I'm going to get a wrench
since it is just not worth the trouble with the shim material - shim stayed in
the tensioner when I removed the wrench.
Next I removed the tensioner, again tight in there, had to use a deep socket
and if you loosen the bolt all the way then it is right up against sheet metal
and you can't get it off. Loosen it, remove the socket driver and go by hand
with the socket the rest of the way.

Started it with the belt off and the screech noise is gone - good that it is not
the timing belt.

Tensioner pulley spins very smooth and without play, but the idler has a lot of
play, so that is probably the problem. Just so happens I have one on the way
since it was my guess as the problem.

I might just go ahead and do the timing belt now since it is this far apart.
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PeteB
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Year and Model: 1996 Volvo 850 Wagon
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PeteB

Re: serpentine belt tensioner/idler replacement

Post by PeteB » Wed Mar 09, 2016 1:11 pm

Wondering how to get the idler pulley off. I'll try to find it in this online repair manual:
http://www.matthewsvolvosite.com/forums ... php?t=8018

PeteB
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Joined: Tue May 27, 2014 5:50 pm
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PeteB

Re: serpentine belt tensioner/idler replacement

Post by PeteB » Thu Mar 10, 2016 4:30 pm

There is a large black plastic cap over the 12mm bolt for the fixed idler, pry
it off and then remove the bolt with a 12 mm wrench - very tight in there.

The old idler was made by FAG embossed into the plastic pully, ball bearing
is an RSR 6003 on the new and old part. New part has INA F-551829 lettering
on the plastic part. New part looks to be of very high quality good to see that
the exact same bearing is used as OEM.

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