Volvo RWD 120-130 Forum

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Cable vs hydrolic clutch mechanism 120-130

posted by  tdskip on  Sun Dec 20 00:09 CST 2009
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last visit: Sun Nov 13 21:12 CST 2011
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Is there a difference in feel or reliability with a cable clutch mechanism? Given a choice why wouldn't you go this route to avoid having to deal with leaky clutch slave cylinders (over time) etc...?








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    Cable vs hydrolic clutch mechanism 120-130

    posted by  someone claiming to be patrick of montreal on  Fri Dec 25 08:04 CST 2009 [RELATED]

    I used to be very wary of hyd clutches untill a few cable clutches had snapped. Now I prefer the longevity of hyd clutch plus the feedback as it starts to fail. A hyd starts to be a little fussy and need some pumping (usually) or sometimes needs more fluid for a temporary fix. A cable can and will fail all of a sudden, though they also just got stiffer and stiffer sometimes and then it's time to pull it.








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    Cable vs hydrolic clutch mechanism 120-130

    posted by  122 and 940 and too many on  Sun Dec 20 01:19 CST 2009
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    last visit: Mon Apr 25 13:12 CST 2011
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    It's not worth the bother, and a broken clutch cable is an absolute fail, a leaky cylinder will drive indefinitely if kept topped up.

    To convert to cable clutch you need to change the release arm, the cable pulls, the cylinder pushes. And to do that means dropping the gearbox. The Volvo cable design is a pain to change the cable on. The only reason Volvo changed to the cable clutch on a 120 on the '69 and '70 cars was for clearance on the dual circuit brakes.

    If you change the fluid on the hydraulic clutch as part of regular maintenance they last pretty much indefinitely. I've yet to rebuild one twice.








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      Please elaborate on your statement! 120-130

      posted by  Ron Kwas on  Mon Dec 21 10:56 CST 2009
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      last visit: Fri Oct 24 04:03 CST 2014
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      "The only reason Volvo changed to the cable clutch on a 120 on the '69 and '70 cars was for clearance on the dual circuit brakes." Thanks








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        Please elaborate on your statement! 120-130

        posted by  cardog on  Mon Dec 21 14:34 CST 2009
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        I always thought it was fo rcost savings, Just my guess. I have always thought the hydraulic felt better, and yeah, the cables are a pita to replace and the newer ones seem a little bit long, (for the 142 anyway) again this is just a guess but I think they're a 240 unit that is also apliccable fo rthe 140 but are just a bit long.
        CU








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          Please elaborate on your statement! 120-130

          posted by  derek uk on  Mon Dec 21 23:04 CST 2009
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          I think it's probably down to the decision to mount the servo as flush to the bulkhead as possible on the B20 144. The earlier "trumpet" type allowed a hydraulic MC to be fitted and was probably designed to allow this and for no other reason. Fitting a cable clutch and shortening the servo also allowed the battery to fit in front of it as well. Back engineering the B20 into the Amazon for a couple of years meant more compromise. You've only got to look at the RHD set up with the cross over bar to the servo and the cable looping across the top of the engine to see that. As said, cables are MUCH cheaper and are direct acting, so no strange effects when the seals start to go. The hydraulic system pushes and the cable pulls. I think that the longer cable clutch arm will give a lighter feel than the hydraulic one although the diaphragm clutch helps. A light clutch is always a plus point on a test drive on a new car so way back then it would have been a selling point, especially to women. Now days they are VERY light.







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