nic996 Posted September 19, 2020 Report Share Posted September 19, 2020 Hi all, i have a strange issue with a freshly rebuilt gearbox. When I pull away in first or reverse I get a crunch unless I’m extremely cautious with the clutch. Otherwise it works well once underway with nice clean gearshifts. I thought syncros but there is no reverse syncro and the effect is identical. Can anyone make any suggestions? cheers nic. Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
jonwat Posted September 19, 2020 Report Share Posted September 19, 2020 Sounds like the clutch isn't fully disengaging, make sure it's correctly adjusted & bled properly. If the weather is hot, no crunches in the cool morning & worse in the hot afternoon, it could be "red hose syndrom" so consider changing to a SS braided hose. 😃 Quote Cheers, John W http://jonwatkins.co.uk Link to comment Share on other sites More sharing options...
nic996 Posted September 19, 2020 Author Report Share Posted September 19, 2020 The clutch did cross my mind. The clutch hose is already ss. I will have another go at bleeding the clutch and adjusting the arm. Thanks for the input. 1 Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
nic996 Posted September 19, 2020 Author Report Share Posted September 19, 2020 I checked and adjusted the clutch. It’s no better. The thing is, it only happens when the car is at a standstill and I give anything more than 1500rpm. And it only happens when the clutch bite is found. Otherwise it goes into gear no problem. It’s as if the gears are not meshing properly when the car is not rolling but fine when underway. Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
nic996 Posted September 19, 2020 Author Report Share Posted September 19, 2020 I should add that I ruled out linkage mal-adjustment by disconnecting the linkage and putting into first gear by hand at the gearbox end. Made no difference. Still grinds before it gets off the line. Also I just tried to pull away in second gear and it’s the same problem. Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
Chillidoggy Posted September 19, 2020 Report Share Posted September 19, 2020 To clarify - engaging 1st and reverse gears is no problem, but you get a crunch when pulling away in either gear? Quote Margate Exotics. Link to comment Share on other sites More sharing options...
nic996 Posted September 19, 2020 Author Report Share Posted September 19, 2020 Exactly right. Pulling away in second produces the same problem as well I just found out. Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
Chillidoggy Posted September 19, 2020 Report Share Posted September 19, 2020 So, the clutch is actually engaged when the noise happens? If so, I would say it’s more gearbox-related. Quote Margate Exotics. Link to comment Share on other sites More sharing options...
nic996 Posted September 19, 2020 Author Report Share Posted September 19, 2020 Yes. I’m inclined to agree that there’s a problem with the gearbox. Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
nic996 Posted September 21, 2020 Author Report Share Posted September 21, 2020 Publicly shaming myself here but I found the issue. A lesson to other diy mechanics. Having only ever fitted clutches to fwd cars, I didn’t know about the spigot bearing and neglected to fit one. The clutch has been bouncing around a bit. Luckily the gearbox is fine and only my pride is damaged. Problem solved. Thanks for the suggestions. nic. Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
jonwat Posted September 22, 2020 Report Share Posted September 22, 2020 14 hours ago, nic996 said: Having only ever fitted clutches to fwd cars, I didn’t know about the spigot bearing and neglected to fit one. Good to know it's fixed but why don't FWD cars have spigot bearings? Quote Cheers, John W http://jonwatkins.co.uk Link to comment Share on other sites More sharing options...
AndyPG Posted September 22, 2020 Report Share Posted September 22, 2020 16 hours ago, nic996 said: I didn’t know about the spigot bearing and neglected to fit one. Sound like you got off lightly with that. So....did you remove the old spigot bearing?🤔 Andy. Quote Link to comment Share on other sites More sharing options...
910Esprit Posted September 22, 2020 Report Share Posted September 22, 2020 And dont forget to ensure the spigot bearing is fitted flush with the flywheel. And also the nylon washer is present on the input shaft! Quote Link to comment Share on other sites More sharing options...
nic996 Posted September 23, 2020 Author Report Share Posted September 23, 2020 @jonwat fwd gearboxes have a solid input shaft through the entire gearbox so they don’t need to be supported at the crank end. @AndyPG the engine was supplied reconditioned without the bearing. The old one was still in the old engine when it was exchanged. @910Esprit advice duly noted. Thanks. 1 Quote The reason people use a crucifix against vampires is that vampires are allergic to bullshit - Richard Pryor -1971 Link to comment Share on other sites More sharing options...
dsvitesse1 Posted September 23, 2020 Report Share Posted September 23, 2020 This gearbox in fwd cars like Citroen DS, SM and C35, all have the same input shaft with support in flywheel by deep grove ball bearing. cheers, Harry Martens Quote with kind regarDS, Harry Martens www.ds-vitesse.com Link to comment Share on other sites More sharing options...
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