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Car Forum / Volvo Cars / September 2005740 clutch control arm problem
Hi, Anyone come across this and how did you fix it. Driving along and you push the clutch in. Clutch pedal goes all the way to the floor and doesn't come up again. You pull over and stop. On looking at the clutch slave cylinder and clutch release arm you find that the clutch slave cylinder piston has pushed it's way through the release arm and the whole slave assembly has fallen to pieces. This is an inherent fault with 88 740s! Any solutions to fixing i9t without replacing the whole release arm assembly? Thanks - Roy Make sure that the clutch control arm has not come adrift from it's pivot point. All the best, Peter. 700/900/90 Register Keeper, Volvo Owners Club (UK). > Hi, > Anyone come across this and how did you fix it. Driving along and you push [quoted text clipped - 5 lines] > fixing i9t without replacing the whole release arm assembly? > Thanks - Roy > Hi, > Anyone come across this and how did you fix it. Driving along and you push [quoted text clipped - 5 lines] > fixing i9t without replacing the whole release arm assembly? > Thanks - Roy The only problem I've had with that is a worn assembly that allowed the piston to push completely out of the bore. When you say it's pushed through, do you mean the metal of the release arm has actually broken? If that's the case you'll have to replace it. No, what I mean is that the end of the piston has pushed through the hole in the arm where there should be a plastic bush that holds the end of the slave cylinder piston against the release arm. The arm is not broken in any way. All that is needed is some way of holding the end of the piston in place. Think of it as a ball joint type assembly where there should be a socket on the end of the release arm but the socket has worn, fallen off and the end of the piston has pushed through the hole where the socket connects to. - Roy > Hi, > Anyone come across this and how did you fix it. Driving along and you push [quoted text clipped - 5 lines] > fixing i9t without replacing the whole release arm assembly? > Thanks - Roy > No, what I mean is that the end of the piston has pushed through the hole in > the arm where there should be a plastic bush that holds the end of the slave [quoted text clipped - 4 lines] > of the piston has pushed through the hole where the socket connects to. - > Roy Perhaps I'm missing something, but it seems the obvious solution here is to get a new bushing, the dealer should be able to order it. > > No, what I mean is that the end of the piston has pushed through the hole > in [quoted text clipped - 10 lines] > Perhaps I'm missing something, but it seems the obvious solution here is to > get a new bushing, the dealer should be able to order it. There isn't a bushing. The rod coming out of the slave cylinder seems to have worn a hole big enough so it goes right through the release arm. Sounds like it's time for a new arm (which would require transmission removal) or someone to patch up the existing arm (custom work which may end up costing the same as arm replacement).  SignatureMike F. Thornhill (near Toronto), Ont. Replace tt with t (twice!) and remove parentheses to email me directly. (But I check the newsgroup more often than this email address.) > Hi, > Anyone come across this and how did you fix it. Driving along and you push [quoted text clipped - 5 lines] > fixing i9t without replacing the whole release arm assembly? > Thanks - Roy Would a suitably thick and large enough diameter washer properly fixed onto the end of the actuator plunger not resolve this? Reading the posts below, it sounds like you need to investigate how the piston popped out, it should be securely held in place by a substantial internal circlip, you also should carefully clean the actuator piston, and it's bore, there is a long spring in there also which causes the actuator to maintain a very light pressure against the clutch release arm, after reassembly, fit the proper internal circlip, then refill and bleed the hydraulic circuit, I've had one of these badly and suddenly leak, giving a whole meaning to gear changing. This fix above won't look very neat, but, it should get you mobile again, and it's not like you drive around looking under the car all day:-) Best wishes from blighty, Ken Phillips The piston isn't held with anything except the pressure of the release arm against the end of the piston. the end of the piston sits in a cup normally which sits in the hole at the end of the release arm, this is what has worn through and this is what needs replacing. it's an extremely bad fault and one that needs watching out for. If your sat at the lights with the engine in gear and this fault happens, then the car is suddenly going to lurch forward and it's bye bye to some pedestrian. Surprised it hasn't been the subject of a service recall... be warned! The part is not, as far as I know available from volvo, there is a fix and it does not involve replacing the release arm. - Roy > > Hi, > > Anyone come across this and how did you fix it. Driving along and you push [quoted text clipped - 22 lines] > > Ken Phillips |
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