Drive shafts. Issues?

[T3rra]

I just replaced the rear wheels on my 88 turbo today. Took the car 2 garge and worked along side them. I removed both drive shalt and re packed the cv joints with fresh grease after remove as much off the old grease as possable.

Car was fine 4 about 20miles, the bearing noise was gone and everything was quite. Then I started getting a knocking noise. Which is more aparnt when turning left, but can be heard when going straight.

I spoke with the mercanic who did the work with me. He thinks the driveshaft is worn, and has seated in a slightly differnt postion then before or maybe instoled the other way round.

So seems like I need new driveshaft or at least cv joints at each end.

Any sirguestion or thoughts?

 

[robwright]

Sounds like a CV joint issue to me. Did you ensure the driveshafts were put back in the original orientation? Did you remove the CV joints or just clean and regrease?

 

[T3rra]

There on the same side, but may have been turned around. I didn't strip the cv joint down as we was pushed 4 time. I turned up at 1 got straight on a ramp and didn't leave till 8. Which was really friendly off a garge Im Not known by. I just pulled the rubber back removed as much off the old black grease, working the cv joint 2 free up more old grease, and then Repacked and worked the grease in.

The noise is silghtly like a flat tire.

Should I remove and turn around? Or just by new drive shafts or cv?

The paint has flaked on mine, so they look a bit sorry 4 them selfs but the rubbers and bearings seemed fine.

Design 911 sell 2 types a Q drive £100 +vat and GNK £135 with a £40 surcharge on exange. Not sure if that makes them £95 or £175+ vat

 

[robwright]

Two things I think you definitely have worn CV joints and you have turned the driveshaft around on one or more side hence now the knocking. I would advise new CV joints. for future reference always keep the driveshafts on these cars on the correct side and orientation as the metal in them can wind itself up over time. Plus it's always good engineering practise.

 

[T3rra]

Thanks,

Any sirugesstion on best place 2 get these from? Should I get cv joint as apoise 2 conplete driveshaft? Are the replacement parts as good as stock.

 

[robwright]

God no don't buy driveshafts unless you remove the CVs and see that they are physically damaged. As for where just do the rounds of the usual places porsche shop, design 911, promax, and never forgetting frazerpart. All will give you differing prices for CV joint kits. Eurocarparts, GSF and ebay are always wortha punt also.

 

[zcacogp]

A couple of observations;

1. When you re-packed the driveshafts, did you get as much air out from the boots as possible? If not, the grease spins its way to the outside and the air moves to the middle, and the joint is left dry (think of the air as a bubble inside the boot, which works as a sealed system.) If not, you may be able to resurrect the situation by doing the job again but taking a lot of time and effort to 'burp' the air out from 'round the boots, where they seal around the driveshafts.

2. The only way to make a CV joint work "the other way around" is to fit the whole driveshaft on the other side of the car. Turning one driveshaft so what was the inside becomes the outside doesn't make it drive on the other side of the CV joints. (If you doubt me, work it out with a pencil and paper.) As long as you fitted the driver's side driveshaft to the driver's side of the car then you will be OK.

3. When I bought CV joints for my S2 the cheapest place was Max at Frazerpart, and his service was excellent. It's worth shelling out the extra for new bolts; not because the old ones snap, more that you are likely to chew the heads of one or two up getting them off and it's always helpful to have a few spares.


Oli.

 

[os951]

Have you put joints back together as they shoud be? You can easily put center piece wrong way. That usually prevents joint to move freely and cause noise. Eventually CV joint will be broken.

 

[sulzeruk]

GSF are the cheapest for turbo CV joints. They are also by the OEM company that supply Porsche as well (GKN) Try and grasp the driveshaft with your hand clenched round it and twist back and forth like a motorcycle throttle. If there is play, the joints have wear in them. There are also stone guards that some cars have as well with 3 per side. They are like the strengthener tabs that go 2 per bolt but are wider. They go at the wheel bearing side to rpevent any stone, etc getting into the bearing area.
Alasdair

 

[zcacogp]

Interesting Alasdair, is that what they do? I always thought they were some kind of load spreading device, to prevent the force of the bolt being too focussed. (But they look so flimsy compared to the CV itself it didn't make sense to me!)


Oli.

 

[T3rra]

There's deff some twist play on the left side, yet the noise seems like it comes from the right? I get noise turning left and no noise turning right. Noise going straight which stop if I light press on the brakes?

Jmg have offered me rebuilt drive shaft, new cv joint £100 per side.

 

[sulzeruk]

If it is noise whilst turnng, could be your wheel bearing. You would really need to get it up in th air for a look and check.
Alasdair

 

[andy watson]

Has your car had a LSD fitted

I don't know much about these things the only reason I ask is that I have just replaced my diff oil in the M3 due to noise on only turning left, this is caused by the oil ending up on one side as you turn leaving the other side dry - hence the noise

New oil = No noise []

 

[T3rra]

Got a diff. Replaced the oil with 75/90

Jon at jmg thinks it could be the bearing due 2 the fact I can stop the noise with my brakes. But that's only just started happening, maybe 100 miles after fittment. Maybe the new bearings are shot as well? Beeping able 2 stop the noise with the brakes only happened after a 60 miles drive down the motorway.

The bearings dropped in, frozen and heated arm. The half stubs where drawn in.

I had the mercanic take the car on a test drive yesterday. But most off that was at 60mph due 2 the local road speed. I couldn't really hear the noise. But he did say he couldn't hear wheel bearing noise. When down a few back roads slowly and theres wasn't much noise.