96 855R lifter noise?

Post by **hausmeister** » 24 Apr 2016, 03:14

I don't know what the issue might be, but both my s70 and 850 only have lifter noise after starting if they sat a few days. Otherwise no noise like that whatsoever.

Also, be cautios, Mobile1 0w40 is not full syn - at least the "New life" stuff.

Post by **rspi** » 24 Apr 2016, 06:25

I had a CV axle grinding with load and when my car was overloaded, no boot wear or damage. Started at about 280,000 and ended when I replaced it at 302,000.

How old are your timing belt tensioners? I usually don't replace the ones that don't leak but I recently noticed a weak one the other day. If the belt is getting some slack under load/torque, it can cause those cams to rattle.

Post by **rguzz** » 24 Apr 2016, 12:07

A rattle. That's what I have. Interesting thought about the timing belt tensioners. I also feel underpowered, which makes me think pre-detonation in my case.

Post by **Clemens** » 24 Apr 2016, 13:05

Interesting to hear M1 new life is not fully synth. Cuz back in the day when I worked at ExxonMobil M1 0W-40 was fully synth.

Belt and tensioner are about half a year old. Gonna check on those CV joints. I guess the CV Joints cannot be replaced, this probably calls for new axles.

Post by **rspi** » 26 Apr 2016, 14:51

Clemens wrote:
Belt and tensioner are about half a year old. Gonna check on those CV joints. I guess the CV Joints cannot be replaced, this probably calls for new axles.

Even the hydraulic tensioner?

Post by **Clemens** » 26 Apr 2016, 23:44

Hmmm... After buying the car i gave it to my indie mechanic end told him to do the TB with everything attached including the pump cuz I didn't have time to do it myself. I might habe to ask him or look for the invoice.

Sommerfeldt · Post by **Sommerfeldt** » 27 Apr 2016, 03:56

I'm a little sceptical about this whole tensioner thing. It's hard to hear stuff going on on that side of the engine from the driver's seat, even when the windows are down. I couldn't hear my noisy tensioner for the serpentine belt while I was driving, and that thing was loud.

I'd say this is either normal engine noise, or possibly an exhaust leak which makes you hear the normal lifter noise extra well?

- S

Post by **rspi** » 27 Apr 2016, 05:46

My thought is if you have a weak tensioner it may allow some slack in the timing belt when under torque (not good but possible). This slack may allow the cams to rattle in the head a little.

I recently looked at a car that had a bad rattle in the head and the owner was told that the engine was bad. I pulled the timing belt cover and found the water pump pulley loose causing the belt to shake, made a.lot of noise in the head. After I replaced the water pump it was very quiet.

So, I'm thinking that may be possible if the tensioner is weak and so to keep the belt tight under load.

Sommerfeldt · Post by **Sommerfeldt** » 27 Apr 2016, 06:40

rspi wrote:My thought is if you have a weak tensioner it may allow some slack in the timing belt when under torque (not good but possible). This slack may allow the cams to rattle in the head a little. ...

Ah, I see. I didn't think it through.

Still, I think this might be normal engine sounds, possibly audible b/c of exhaust leak. I'd think that if it was the problem you describe, the noise would be there continuously? Or am I not thinking enough again?

- S

Post by **Clemens** » 27 Apr 2016, 07:56

Robert´s idea sounds understandable, it only occurs under partia load when the belt flexes more. Under full load I can´t hear it because everything is loud then. But then the exhaust sounds reasonable too.
I always compare the Sound of my R to the one of the 854 10V. Not because I want to but because I´ve had the 10 V forever and the R is my first Turbo. So maybe I am - once again - hearing things that are not a problem (yet). I always do that with cars because I just like to Keep them running as long as possible.

Is there a way to check the belt tensioner?

UPDATE: I just checked the invoice, the tensioner was done too in Sept. 15.

Next week I´ll do the PCV again and do an oil change, could help if it´s lifter related.