My 560SL has developed some worrying clunking Let me explain :
When i engage Drive, the transmission engages with a clunk after about 2 seconds with a bit of a pull on the vehicle. If i then shift to reverse, there is a worrying creaking noise and another clunk. It does not sound healthy at all. A few days ago, it would not go into reverese at all and eventually after 10 tries from D to R, it eventually did. At the times it was not engaging reverse, it was making a whining noise.
Also, quite regularly, it will not engage when i put it in D. I have to select 3rd gear then put it in D for the transmission to engage.
Any ideas as to what the problems could be?
Oh, and its a 1989 model with 72k on the clock.
Cheers - Max
1. check fluid level, with engine running, warm, in 'P' on a level surface.
2. note colour of fluid. (should be nice clean light reddish brown if genuine fluid, or just red if dex 2/3.
3. modulator pressure needs to be checked with a vacuum gauge.
4. modulator adjustment needs to be done with engine cool, or you will get burned.
5. there are't too many things to go wrong: clutch packs, bands and servo piston are the usual culprits. correct adjustment and regular fluid changes ensure longeivity (service (oil and filter plus new pan gasket every 30,000km)
6. if you do this, and you still have problems, then chances are the bands are cactus. the seal on the servo piston is usually not far behind. some transmission conditioner can relieve a bit of stress, and soften up seals a bit to make them pliable, but it is not a guarantee and only delays the inevitable.
overhaul is not cheap, but is worth it, and should give you another 200,000+ km of trouble-free motoring.