Volvo RWD 140-160 Forum

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Clutch Adjustment 140-160 72

I replaced my clutch cable about 6 weeks ago and tried to get the friction point higher then it was before replacement (about an inch above the floor) but even when the cable was set at the tightest setting on the fork (by adjusting the bolts) it's just the same as before.

I need to tighten the cable somehow because if the pedal is anything but on the absolute floor, the gears are harder to shift and have now begun to crunch sometimes.

Is there any other way to tighten the cable?

Thanks!








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    Re: Clutch Adjustment 140-160 72

    I had a good look at the pedal and fork today and I couldn't find anything that was bent. For now I'll put the second ajustment bolt on the otherside to get more tension until I get time to take it to be looked at.

    Thanks for everyones help!!!!!!!!









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      Re: Clutch Adjustment 140-160 72

      I have the same problem on both 72-140's, one of which I had installed a

      complete new clutch and cable and the other was as I received the car whether the clutch was from new or replaced, I don't know.

      My solution which seems different from all the others and it works, is to

      look at the pedal stop inside the car...i.e. the metal bracket (tab) that

      stops the pedal from coming towards the driver. You will need to lie on

      your back on the floor boards looking up behind the dash to see this stop

      bracket. I simply bend this tab/bracket so the pedal returns to a higher unengaged (not depressed position). This allows you to remove more slack on the cable adjuster and gives more movement at the clutch fork as there is more travel of the pedal from not depressed to fully depressed position. The pedal ends up sitting higher than the brake pedal but it does allow the clutch to fully disengage.

      One of the replies mentions the rubber block as used on the 240 series which is fitted at the tail end of the cable between the fork and the

      ball on the cable. This works well if the problem is that you have run

      out of adjustment and need to take more slack out of the cable, but if I

      interpret your problem correctly my other solution is the ticket....syd








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    Re: Clutch Adjustment 140-160 72

    The clutch cable should be adjusted so that there is free play at the clutch fork. Unlike a lot of modern release bearings the Volvo 140 bearing does not run in contact with the clutch cover plate. This adjustment is made at the clutch fork end of the cable. When correctly adjusted you should have free play (eighth to a quarter of an inch) when you move the fork towards the front of the car before you feel it contact the release bearing.

    If at that point you have a strange pedal you have another problem.

    The pedal has a return spring on it, it wraps around the fulcrum bolt, and then loops around the back of the pedal forcing the pedal away from the firewall, these break allowing the weight of the pedal to pull against the cable constantly, it will kill release bearings in short order.

    Check the pedal bushes are not worn out

    As someone else wrote, the release arms are weak, there was a redesign of it once, maybe twice.

    Are you sure you don't have a dodgy cable, I know it is new but what you are trying to do is merely masking a fault elsewhere.

    Or you have a faulty clutch

    Regards








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    Re: Clutch Adjustment 140-160 72

    Chevy!

    Just back from Esther's wedding and have forgotten whether yours

    is a 140 or a 164. If yours has a ball on the end of the cable and

    you can get to it, one thing you can do is press a piece of split

    tubing around the cable between the fork and the ball. You can also

    rearrange the nuts so both are on the same side and pull the clutch

    a little further. You may also be able to do this at the upper end

    of the cable too.

    It sounds like you may have the wrong kind of throwout bearing.

    On my 164 a number of years back I had the same symptoms (pardon me

    if I am being redundant). It has a throwout shaft operated by a lever

    and the fork mounts to the shaft inside the bellhousing. The lever

    was welded to the shaft and eventually fractured, yielding through

    about a 30 degree arc first. Really buffaloed me because I had adjusted

    on almost a daily basis and about every time I stepped on the clutch

    it gave some more. Fortunately I had another arm/shaft assy which I

    put in when I pulled the tranny. Part of this problem was due to using

    a Chevrolet V8 clutch that just happened to bolt up to my B30 flywheel.

    It was a LOT stiffer than the F/S diaphragm clutch, not to mention about

    an inch thicker too, requiring LOTS of mods to install without interference

    with things inside the bellhousing. I'm back to standard now.

    Best wishes on getting the thing straightened out!








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    Re: Clutch Adjustment 140-160 72

    /// Some where in the thread you said the transmission had been removed and replaced. Did you do it or have it done? Check all the motor and transmission mounts. The position of the motor and transmission in the frame will also set the pedal friction point.

    I had this happen in an manual to auto transmission swap. The auto transmission mount would not match the holes in the frame so the mechanic took a torch and burned the holes out to oval. Both motor mounts were bad and the engine had slipped back about a quarter inch.

    The condition inside the clutch will greatly change the position. If there has been wear on the fork ends that small wear is multiplied by the length of the lever outside the clutch. Check the correct dimension of that lever then the shape and dimensions of the fork ends. The throw out bearing in rare cases can fail in a manner that will change the dimensions of the clutch lever and it's action.








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      Re: Clutch Adjustment 140-160 72

      I didn't pull the tranny, my godfather did it for me (he's a registered AND practicing mechanic).

      Friction point before the tranny was removed was only about 1/2" above where it is now so not much has changed.

      I'm going to try to put an extra washer between the firewalland the cable to try to get the cable a little tighter but the thickness of a washer or two won't be making much of a difference.








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        Re: Clutch Adjustment 140-160 72

        /// I thought of something else. I pulled a standard trans from a 1980 and put in a auto. When I compared the clutch cable later to a 1983 there had been design changes. Maybe there were changes in your clutch cable that limit the adujustment range.

        In 1980 the whole metal line had a ridge that spiraled and functioned as the thread for the adjuster. (An almost unlimited adjustment range.) By 1983 the adjustment range was limited to the length of the nylon collar at the ring on the frame.

        I don't have the experience to call up the details of the 72 from memory. My 72 is an auto 1800 and my 68 (wreck) is sitting low to the ground. In the current weather here I can't get to the clutch to examine it.

        If it warms up and clears off I can shoot pictures of the 68 for you keep the email address.








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    Re: Clutch Adjustment 140-160 72

    I'm not sure how well this would work, but couldn't you find some washers that fit around the housing and slide them between the little flange and the pedal box? Below is a picture of how it would work. I hope this turns out. I have never tried this, but it seems like it should work....

    x = pedal box

    | = existing flange on clutch cable

    : = washer

    - = actual cable, with loop (o) to fit over top of pedal

    Chevy x::|

    over o---x--|----- engine over here

    here x::|








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      That was terrible. Try again 140-160 72

      Chevy x::|

      over o---x--|----- engine over here

      here x::|








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    Re: Clutch Adjustment 140-160 72

    I had a similar clutch problem on my '71 142. The cause of my trouble

    was a cracked clutch fork. The fork was bending enough to prevent

    the clutch from fully releasing.








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      Re: Clutch Adjustment 140-160 72

      I doubt it's that because my cable only snapped 5 weeks after the gearbox was pulled out to help locate a strange oil leak and the entire clutch plate and components were in good condition. But that was one of my first thoughts to because the fork didn't have a return spring when I bought the car (It only had 500mi since rebuilding) and maybe it was wearing because it never came of the clutch but the fork was shown to be ok.









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    Re: Clutch Adjustment 140-160 72

    On the newer clutch-release mechanisms, a small hard rubber isolator bumper gizmo is installed between the fork and the cable. This 3/8"-thick thingy reduces vibration transmitted up the cable, but also "shortens" the cable due to its thickness.

    Is that rubber spacer in place on your car?



    Don Foster (near Cape Cod, MA)








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      Re: Clutch Adjustment 140-160 72

      There isn't one that I know of.

      When I put the cable through the firewall there were a few washers that looked as though they were'nt original but I left them there because i knew it would help tighten the cable, does this has anything to do with it?








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    Re: Clutch Adjustment 140-160 72


    I would suggest cutting a little off.

    (the inner cable)








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