Myles Posted August 7, 2014 Share Posted August 7, 2014 Following on from my Type 9 thread, I noticed that there seems to be 'quite a lot' of play/lash between the prop and the diff in my car. Haven't measured it objectively yet. Any guidelines for how much is too much? Couldn't find anything in the archives (maybe my search terms were pants....)? Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted August 7, 2014 Share Posted August 7, 2014 Phil Stewart at Road & Race is your diff guru. Give him a ring 01959-525105 Link to comment Share on other sites More sharing options...
ECR Posted August 7, 2014 Share Posted August 7, 2014 How much of it is in the universal joint ? ..... Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 7, 2014 Member Share Posted August 7, 2014 Quoting Myles: Couldn't find anything in the archives (maybe my search terms were pants....)?Try "prop play". But, as above, you need to work out if it's in the joints first. Jonathan Link to comment Share on other sites More sharing options...
Tony Whitley Posted August 7, 2014 Share Posted August 7, 2014 I just happen to have been checking mine this morning and the answer in my case is "an awful lot". None in the UJ as far as I could see/feel. Link to comment Share on other sites More sharing options...
Rob Walker Posted August 8, 2014 Share Posted August 8, 2014 There should be only the smallest amount off play in the diff ( 0.5mm) when holding the driveshafts at the inner most point and turning the diff input flange. Some of our favourite gearbox/diff rebuilders build them with far too much backlash IMO, with the view that this backlash will be taken up by expansion when hot and in use. My view is that the casing is cast aluminium and the diff is steel and that the casing will expand far more than the diff so any back lash will increase, hence why most diffs in our cars are very noisy after hard use. I hate driving a seven with driveline backlash, feels horrible on light throttle . Rob Link to comment Share on other sites More sharing options...
Myles Posted August 8, 2014 Author Share Posted August 8, 2014 Rob, Are you talking about the amount of rotation in the prop between it just starting to engage power-on-to-power-off? I would hazard a guess that I've got maybe 5degrees of rotation (by the prop) between the two - this is the (nature of) play I'm concerned about. It's much easier for me to check the play in my Westie prop/diff as the prop (BEC engine) is accessible in the engine bay - although it's a completely different diff (Freelander LSD), it will give me some kind of comparison. Back shortly! Link to comment Share on other sites More sharing options...
Myles Posted August 8, 2014 Author Share Posted August 8, 2014 Westie is much tighter but still has play. I would guesstimate (without jacking the Caterham back up again) that it might be as little as half as much as the Caterham. Or, to put it another way, the Cat has a lot more than the Westie... Link to comment Share on other sites More sharing options...
Rob Walker Posted August 8, 2014 Share Posted August 8, 2014 Myles, I am talking about the amount of rotation of the diff input flange the bit the prop fastens to. Ford specify 1/32" backlash. That is the amount the diff flange which is bolted to the pinion moves within the crown wheel. Other words virtually nothing. Link to comment Share on other sites More sharing options...
Myles Posted August 8, 2014 Author Share Posted August 8, 2014 Mine definitely moves more than that then! It has done 45k - but that shouldn't trouble it. I think I might have under estimated the weep of oil from the seals over time - I've never seen as much as a drop on a driveway over the years but there's always some near the driveshaft seals. Assuming it is goosed (it's not, but I'm not planning on rebuilding the car until at least this winter), is it 'just' a new crown wheel and pinions? Open diff, not LSD. Link to comment Share on other sites More sharing options...
Mankee Posted August 8, 2014 Share Posted August 8, 2014 If the CWP is in good order, you *should* be able to shim the pinion to set the backlash to what it should be. Link to comment Share on other sites More sharing options...
Myles Posted August 10, 2014 Author Share Posted August 10, 2014 Thanks. One to leave to the next big rebuild, I think. Link to comment Share on other sites More sharing options...
Mankee Posted August 10, 2014 Share Posted August 10, 2014 Time to switch to an LSD while you've got it in bits? Oh, here's a diff overhaul manual if you fancy a crack yourself: http://www.fordscorpio.co.uk/manual/rearaxle/DiffOverhaul.pdf Edited by - Mankee on 10 Aug 2014 20:09:34 Link to comment Share on other sites More sharing options...
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