Serpentine belt tensioner

loveMy850 · Post by **loveMy850** » 21 Sep 2020, 12:04

Mines wobbling back and forth,could this be the pulley or tensioner or both. I know the 12 mm bolts to remove it. How do I put the new one on?. Is there any torque or anything I need to know about. It's all one piece. 94 Volvo 850.

duke1 · Post by **duke1** » 21 Sep 2020, 15:09

loveMy850 wrote: ↑21 Sep 2020, 12:04 Mines wobbling back and forth,could this be the pulley or tensioner or both. I know the 12 mm bolts to remove it. How do I put the new one on?. Is there any torque or anything I need to know about. It's all one piece. 94 Volvo 850.

hi i done mine recently its easier than it looks esp if you have smallish hands,in the middle of the tensioner you see a square hole you need a tool i diyed mine out of a bit of scrap square wheelchair frame and you then lock on a spanner and turn it till all the tension is off the belt and then you see a hole in which to insert a splitpin or similar in order to lock the sprung part,like a hand grenade type thing,then theres 2 12mm bolts and the whole thing comes out in one bit.
then you take it to the bench and remove the single bolt holding the tension roller and remove and replace,then simply bolt it back on making sure of belt route is correct and simply release the pin and tension will do itself after a few turns,the tension roller i got from ebay for less than a tenner,may have link i shall see,good luck

duke1 · Post by **duke1** » 21 Sep 2020, 15:11

here is link,btw i do not think the tensioner ever wears out its just a big spring on a pivot so last pretty much forever,link
https://www.ebay.co.uk/itm/FOR-VOLVO-85 ... 2749.l2649

Post by **scot850** » 21 Sep 2020, 15:30

The springs do break and the bearing do seize. If you see the tensioner bobbing up and down when engine is idling it has failed. Replace it ASAP unless you want to toast the motor (serp belt jumps or snaps and takes out the timing belt cover and timing belt).

Some of the older tensioners have a Torx head (T45?) in the center of the tensioner. You need a shortie T45 socket.

Neil.

loveMy850 · Post by **loveMy850** » 22 Sep 2020, 17:06

Thank you Scot850

loveMy850 · Post by **loveMy850** » 22 Sep 2020, 17:11

Scot this is the tensioner I pulled from a 98 s70 , somes places say this part will fit while others say it won't,part number 1275380 Volvo tensioner. I think mine has this one maybe it was changed before I got my car. Hers a pic,

loveMy850 · Post by **loveMy850** » 22 Sep 2020, 17:17

Thanks Duke I have to do this asap..... Tell me you think that part # 1275380 Volvo tensioner will fit?

loveMy850 · Post by **loveMy850** » 22 Sep 2020, 17:42

Thanks Duke I have to do this asap..... Tell me you think that part # 1275380 Volvo tensioner will fit? I have a 1994 Volvo 850 wagon non turbo wagon.

loveMy850 · Post by **loveMy850** » 22 Sep 2020, 18:51

Will somebody please tell me if the part nomber1275380 Volvo tensioner will fit my 1994 Volvo 850 wagon 2.4 5 cyl.
Duke gave me an excellent write on how to install the tensioner.

duke1 · Post by **duke1** » 23 Sep 2020, 03:06

loveMy850 wrote: ↑22 Sep 2020, 18:51 Will somebody please tell me if the part nomber1275380 Volvo tensioner will fit my 1994 Volvo 850 wagon 2.4 5 cyl.
Duke gave me an excellent write on how to install the tensioner.

yes im sure it will fit yours is same year as mine and na so yes should be exact same,as scot said bearings and springs wear but tbh its real easy in a vice to judge this and mine had a visible wobble yet nothing wrong with spring or bearing at 153000 miles just tension roller was worn,replaced 1000 miles ago,zero wobble now,good luck