supna Posted May 11, 2004 Share Posted May 11, 2004 Recently I have started to have a knocking noise come from the back end of the car which I thought was the exhaust. After checking the exhaust and concluding it was'nt that, so I think I figured out that the it is the prop shaft knocking as the car pulls away. The strange thing is this only knocks or clonks when the car has been driven for a while. My questions are: 1) Should the prop shaft turn at all by hand if I am under the car checking it? 2) Are these the effects of the differential not having a) enough oil or b) no oil. BTW the car is an sz with the factory lsd fitted. Thanks Quote Link to comment Share on other sites More sharing options...
Alex Posted May 11, 2004 Share Posted May 11, 2004 Is it deffo the prop and not a loose sub-frame bolt or 2? A loose sub-frame will make a clonk noise. Quote Link to comment Share on other sites More sharing options...
supna Posted May 11, 2004 Author Share Posted May 11, 2004 Alex Im pretty sure its the prop becacuse when I pull away its as if the prop turns and clonks. I guess that if it was loose sub frame bolts it would do it all the time not just when it warms up? Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 11, 2004 Share Posted May 11, 2004 some prop movement by hand is normal afaik. My old uk car had about say 10 degrees movement / play..... Quote Link to comment Share on other sites More sharing options...
supna Posted May 11, 2004 Author Share Posted May 11, 2004 So would replacing the diff oil be a good move then??? I am guessing that I have very little or old oil in the diff and when it gets warm it is thinning out and not lubricating properly. Anyone know how much oil and what type to use on the differential. Also where the drain plug and the refill holes are, would be gratefully apprieciated. Ta Quote Link to comment Share on other sites More sharing options...
Wipeout Posted May 11, 2004 Share Posted May 11, 2004 Yip, mine seems a bit clonky too. I have had the diff oil chnged recently and didn't notice any difference. I think they are generally a bit clonky due to the Getrag box. I used Motul Diff oil, takes about 1.6L Quote Link to comment Share on other sites More sharing options...
supna Posted May 11, 2004 Author Share Posted May 11, 2004 Chris mine is the 5 speed box and the clonking is quite unbearable when it does it, it sounds like the exhaust or prop shaft is going to fall off!!!! Quote Link to comment Share on other sites More sharing options...
Wipeout Posted May 11, 2004 Share Posted May 11, 2004 Ooh, Mine is not that bad, there is a slight clonk if you back off the revs at low speeds, but nothing that would make me worry. Dunno then, you could check the diff oil, the plug is easy to get to, there is a fill plug on the side and the drain on the bottom. If you remove the side fill one you should see some oil drain out, it should only be filled to this point. Hope this is of some help. Quote Link to comment Share on other sites More sharing options...
supna Posted May 12, 2004 Author Share Posted May 12, 2004 Just a thought, if I change the oil do I use 75/90 gear oil or LSD Oil? Mine has the factory LSD fitted. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 12, 2004 Share Posted May 12, 2004 Motul Gear 300 Quote Link to comment Share on other sites More sharing options...
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