Metallic particles on the front differential drain plug magnet?
01-30-2015, 12:40 AM
#1
Instructor
Thread Starter
Metallic particles on the front differential drain plug magnet?
I recently changed the front differential oil on my 2004 C4S and noticed some metallic particles stuck to the magnet in the drain plug. Is this usual/expected? I also changed the transmission oil and saw no metal whatsoever in the drained oil. I do notice some whine from the front end, but had ascribed it to the winter tires as I don't really remember hearing it with my summers on. Anyone know of a differential rebuild diy?
01-30-2015, 01:37 AM
#2
Race Director
Differentials are metal particle generators, at least when new. That is one reason why one often finds a factory installed magnetic drain plug in the diff.
Tire noise can really have you worried about the diff or in the case of my 996 Turbo the wheel bearings. What proved to be noisy front tires -- the alignment was a bit off -- had me take my car in for suspected wheel bearing problems. The tech correctly id'd the source of the noise was from the front tires.
You can feel your car's front tires for any signs of alignment problems. Feathering or roughness from the tires not tracking right.
I can also tell you that if the front tires are worn down quite a bit they really get noisy. On another car the front tires were so noisy the noise masked a bad wheel bearing.
If you want and I would recommend it take the car to an experienced Porsche tech and have him give a listen. When I asked about the front diff in my Turbo the techs told me they are seldom a problem and the only symptom is a noisy one. So an experienced Porsche tech has probably heard a few bad front diffs and can tell you if the noise is from the diff.
Sorry, but I am not aware of a DIY for a front diff rebuild. But if it is doable I'm sure someone has done it and has documented it.
Tire noise can really have you worried about the diff or in the case of my 996 Turbo the wheel bearings. What proved to be noisy front tires -- the alignment was a bit off -- had me take my car in for suspected wheel bearing problems. The tech correctly id'd the source of the noise was from the front tires.
You can feel your car's front tires for any signs of alignment problems. Feathering or roughness from the tires not tracking right.
I can also tell you that if the front tires are worn down quite a bit they really get noisy. On another car the front tires were so noisy the noise masked a bad wheel bearing.
If you want and I would recommend it take the car to an experienced Porsche tech and have him give a listen. When I asked about the front diff in my Turbo the techs told me they are seldom a problem and the only symptom is a noisy one. So an experienced Porsche tech has probably heard a few bad front diffs and can tell you if the noise is from the diff.
Sorry, but I am not aware of a DIY for a front diff rebuild. But if it is doable I'm sure someone has done it and has documented it.
01-30-2015, 10:39 AM
#5
Rocky Mountain High
Rennlist Member
Rennlist Member
I had mine professionally rebuilt by a local independent mechanic when it failed. It was roughly half the cost of having my Porsche dealer replace it. The first symptom of failure was gear whine from the front end.
Good luck!
Good luck!
01-31-2015, 01:17 AM
#7
Instructor
Thread Starter
