Serpentine belt -- pulley?

Post by **cn90** » 20 May 2016, 07:31

See Step #3 in the link I posted above.

Post by **erikv11** » 20 May 2016, 08:08

I have never heard of pulleys / bearings failing in the serp path on these cars. On all of my Volvos I just check them and recently, I finally found one that was getting old and spinning too freely, on my V70 (250 k). I replaced it. Even if it did fail, the serp path and timing path are well separated, you are not going to see damage to the timing belt.

140k is a very young P80 engine, you could easily wait another few years if the bearing is not showing signs of problems.

It is very easy to replace, doesn't really matter that you are already in there for timing belt work.

mar601 · Post by **mar601** » 20 May 2016, 09:51

nevermind -- heck my buddy down at CarX will do it for 100 bucks. Love that guy.

Post by **scot850** » 20 May 2016, 10:18

It is your car and you have enough info to do what you are comfortable with.

As to the serpentine belt not causing issue, ask my friend whose belt came off after a pulley failed and as it flailed it smashed the timing belt cover and dislodged the TB smashing the engine valves. I am all for caution, but my personal view is of only wanting to do the job once. In fairness the idler pulley is easy enough to do and a good mechanic should be able to determine if any part is in imminent need of replacement.

Good luck!

Neil.

Post by **erikv11** » 20 May 2016, 10:49

Neil, serp belt taking out the timing belt can happen sure, but it is a rare, rare thing. Was your friend's car a P80? Search this forum I don't know if you
will find even one or two (other?) examples of it, by and large those pulleys just don't fail. Just because it happened on one car, doesn't mean it will happen on them all.

This falls near the fine line between maintenance and restoration. Granted, as these cars age those two begin to blur together. At any rate, if your goal is restoration or you've done everything else and just want to work on the car then you've probably got the money and motivation to just replace things. On the other hand if you're just trying to keep a fleet (or one car) on the road then it's good to know there are different options.

bugs11 · Post by **bugs11** » 20 May 2016, 11:12

https://www.volvoclub.org.uk/tech/servi ... -Turbo.pdf

LUBRICATING AUXILIARY DRIVE BELT TENSIONER
Fig. 6: Auxiliary Drive Belt Tensioner Lubrication Points
Courtesy of Volvo Cars of North America.
NOTE: The automatic tensioner for the auxiliary drive belt must be
greased every 30,000 miles (45,000 km) or if an abnormal
noise is heard from the tensioner.
NOTE: The auxiliary drive belt and automatic tensioner must be
removed from engine in order to properly lubricate.

Post by **scot850** » 20 May 2016, 13:59

The car was a P80. But like I said, each to their own, and a good mechanic should be able to assess the condition of the bearings and decide if they need to be replaced or good to stay. I don't replace every part for the sake of it but as an engineer my view is if in doubt swap it out!

Never seen the tensioner lube info before, so need to have a read up on that. Mind you the mileage my car does that may take about 30 years to get to that mileage!

Neil.

mar601 · Post by **mar601** » 21 May 2016, 08:45

Wow -- great link to that tensioner lubrication -- actually I was told that tensioner noise was my issue. I see reference to the 850 but is this something that should be done on a 98 S70 T5 as well? Is it that 93b98534 in the drawing? Looks like mine if I remember (or close).

If so -- wonder what kind of head that screw is and if anyone has done this before? Maybe getting some grease in there is all I need.

Thanks ! it's worth at try if you can do this with the S70

Post by **cn90** » 21 May 2016, 09:50

- Re lubing: don't confuse lubing the pivoting area (the part that oscillates back and forth), which is not needed in the spring-type tensioner such as in the P80 car.

- In my BMW, I have re-greased the bearing before, if you are careful enough, you can gently lift the seal a bit at the "lip" side (where it meets the rotating surface), inject some grease (I use a syringe and small blunt needle). Another option is remove the seal (but be careful not to destroy it), pack some grease, then re-install the seal using appropriate socket.

- You keep asking what screw, I already answered you above. See my posts earlier and the link I posted before!!!
It is a Torx if you read my replies.

Serpentine belt -- pulley?

Re: Serpentine belt -- pulley?