F355GTS Posted July 30, 2004 Share Posted July 30, 2004 Always the way, did a trackday today and have another tomorrow if I can fix, initially the gearbox seemed reluctant ot go into gear then the lever went like stirring porridge with no decernable gate, it then seemed to work but out of sync ie 3rd 4th and 5th positions were not available, reverse location selected 1st etc Any ideas? Mark Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted July 30, 2004 Share Posted July 30, 2004 Is it a dog box or a synchro box? The selector rod and the plate it moves (don't know what it's called and synchro's are known weaknesses. Edited by - Alex Wong on 30 Jul 2004 17:55:22 Link to comment Share on other sites More sharing options...
F355GTS Posted July 30, 2004 Author Share Posted July 30, 2004 Alex sorry I don't know, it has a semi helicoil 5th, does that help identify it? Mark Link to comment Share on other sites More sharing options...
F355GTS Posted July 30, 2004 Author Share Posted July 30, 2004 Further update The small plastic bit that the gear lever slots into has broken and now fallen off, would this be enough to stop gear selection? anybody got one in the Reading area that I can get from you this evening? Mark Link to comment Share on other sites More sharing options...
F355GTS Posted July 30, 2004 Author Share Posted July 30, 2004 Ok it seems the issue is more serious so engine and box are out, box will be going to Road & Race early next week ☹️ Mark Link to comment Share on other sites More sharing options...
gee_fin Posted July 30, 2004 Share Posted July 30, 2004 If it's just the plastic bit on the end of the gear lever it's about 50p from a Ford specialist. I've had one chewed up before and it makes selecting gear a right pain... ________________________________________________________ graeme finlayson / tyre warmer / fluke motorsport graeme@fluke-motorsport.co.uk / www.fluke-motorsport.co.uk Link to comment Share on other sites More sharing options...
Irrelevant Posted July 31, 2004 Share Posted July 31, 2004 I think the plastic bit will indeed cause these problems . . . .still, if the box is out now, you may as well get it rebuilt - c.£160 @ R&R IIRC After a hi-vis (pocketted side) driver's door if anyone's got one? Link to comment Share on other sites More sharing options...
F355GTS Posted July 31, 2004 Author Share Posted July 31, 2004 Adam/ Graeme thanks for the response, I've taken the top cover off the box and there is a problem, the selector forks look fine but on the selector shaft there is a horseshoe bit of metal, this was hanging down in the box, the corresponding part of metal it sits on is able to slide up and down the shaft which I believe it shouldn't be able to, there appears to be a split pin through it and the shaft which has sheared meaning when the gear lever is thrown it's actually not doing anything to the selector forks Mark Link to comment Share on other sites More sharing options...
ECR Posted July 31, 2004 Share Posted July 31, 2004 The tweak when replacing the roll pin is to insert another smaller roll pin inside it to strengthen it. It's a known weak point Link to comment Share on other sites More sharing options...
F355GTS Posted July 31, 2004 Author Share Posted July 31, 2004 ECR thanks for identifying it as the roll pin, my knowledge of Gearboxes is non existant, I'll take to Phil at Road and Race and ask him to fix it Mark Link to comment Share on other sites More sharing options...
F355GTS Posted August 2, 2004 Author Share Posted August 2, 2004 Update following dropping it off at R&R It's having an uprated Selector Shaft (to remove the need for the plastic bit that the lever locates into) and a dual pinned, machined from solid, bit to replace the bit that broke At least 2 syncro rings are broken ☹️ The gearbox has not been built correctly Apparently only the gasket was stopping the layshaft from moving forward into the bellhousing Mark Link to comment Share on other sites More sharing options...
Chelspeed Posted August 2, 2004 Share Posted August 2, 2004 There are early and late gearboxes. The late ones have a cover over the end of the layshaft fitted externally, small round cover with two allen screws holding it on just below the input shaft. There should be two kinds of bellhousings, one with a recess in it to miss the layshaft cover on later boxes and one without. But as the later bellhousings will fit either gearboxes often people skimp and just make the one kind. So we have a potential problem. With an early gearbox and a properly designed bellhousing, the layshaft can't move out of the gearbox cos the bellhousing holds it in. But with a later type bellhousing (with the layshaft cover cutout) and an early gearbox with no cover then as you say the layshaft can move into the space left for the cover and come out of mesh at the other end causing all sorts of havoc inside. Guess how I know that? Link to comment Share on other sites More sharing options...
F355GTS Posted August 2, 2004 Author Share Posted August 2, 2004 Chelspeed I'm sorry to hear you found out the hard way, people say I'm unlucky with cars but perhaps this shows I get my fair share of good luck too Yes I have a newer type bellhousing with the cutout but the box has no cover as described, however it will have by Wednesday Mark Link to comment Share on other sites More sharing options...
julians Posted August 2, 2004 Share Posted August 2, 2004 I just had my quaife box rebuilt, and the rebuilder said the same to me (re the bellhousing not stopping the layshaft from coming out), so they added a plate to the bellhousing to stop it. As it happens, the layshaft had stayed put for 30 trackdays and thousands of road miles, maybe I got lucky. I wonder hoe many other quaife boxes are out there with this potential problem. Link to comment Share on other sites More sharing options...
F355GTS Posted August 2, 2004 Author Share Posted August 2, 2004 julians Phil was certain that Quaife had not built my box as it is, Maybe it came out of another car with a different bell housing? Mark Link to comment Share on other sites More sharing options...
julians Posted August 2, 2004 Share Posted August 2, 2004 you could be right, I dont know who originally built my box the first time round. Link to comment Share on other sites More sharing options...
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