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M47 - Grazing in reverse and adjustment to cluth cable 200

Hi
I have a 1990 volvo 240 DL -M47 manual . When I change into reverse gear I get this grazing of cluth . I read all the material and found that one should first adjust the cluth cable.
What is the procedure to do it (could not find it) . The 1st and 2nd are stubborn some times and there are some vibrations when shifting from 4th to 3rd, but these do not have grazing issue.
How should I check whether the cluth is worn or not. I used to think that first sign of worn cluth is that it slips under load.
I checked it by first applying the handbrake on and then putting the car in 2nd gear . I released the cluth and the car died and there was no increase in engine rpm. I think this is the expected behaviour so is it cluth cable.
What are your suggestions on this procedure and conclusion.

Another observation is that when I am driving in 2nd gear at 30-40 over very bumpy roads then RPM suddenly increase (cluth slips ?) for a second or two,but ofcourse I done only 3-4 times.


I plan to change the fluid to redline. So far I have put cheap type F for flushing purpose.

Regards
Gopesh








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    M47 - Grazing in reverse and adjustment to cluth cable 200

    The advice you got from the other two posters are good ones. Also what you say about switching to Redline may be good, I haven't done it, I just did the overflow (adding a bit more fluid by tilting car when you fill the transmission, did you do that too? I did notice somewhat of an improvement after overfilling).

    For good general discussion on our transmission you may want to read Paul Grisham's page if you haven't on M47 "crunching"

    http://www3.bc.sympatico.ca/Volvo_Books/trans2.html
    --
    '89 244DL M47 172K miles








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      M47 - Grazing in reverse and adjustment to cluth cable 200

      I drained the old one and have put cheap ATF Type F (1.75$/l) for flushing . I will change to redline in coming weekend . I will say even 1.5$ ATF makes the life easier - Noise is reduced. Gear shift is much easier and precise even reverse is easier. Thanks for the link.
      Regards
      Gopesh








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    M47 - Grazing in reverse and adjustment to cluth cable 200



    What do you mean by a "grazing sound"? The car needs to be completely stopped when changing into reverse as there is no synchro on it. If you have a hard time getting into reverse, breifly pop her into 2nd gear and then into reverse. Should be smooth as silk.

    As for the first and second gear shifting problem, you probably need to adjust the reverse detent (lock-out) plate. From inside the car, under the shifter boot, you'll see it. Two 8mm(?) hex-head screws to loosen, move it towards the driver's seat a little, tighten it up, and you should be back in business.

    I guess an easier diagnostic for the above problem is to see if it's easier to shift into 1st and 2nd when you lift the reverse lock out ring. If easier, adjust the detent plate.

    Hope it helps!
    -Ryan (also 1990 240 with M47)
    --
    Athens, Ohio -- 1990 245, 125k, M47, E-codes -- 1991 745, 278k (girlfriend-mobile)








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      M47 - Grazing in reverse and adjustment to cluth cable 200

      Thanks for the suggestions .Car is mostly stationary when I shift into reverse.Grazing feels like as if clutch has not been released properly even when I fully press the clutch. There is also a clunk(Tunk) sound from below the car when I put it in reverse or when I take it out of reverse It sound like something has popped out.

      Regards
      Gopesh








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        M47 - Grazing in reverse and adjustment to cluth cable 200

        I've got an M45 gearbox with a hydraulic clutch and it's pretty much always done the same as your M47 - it catches a bit, like you were crashing the gears, when selecting reverse (it's also difficult to get into first when warm) like I said in an earlier thread - don't assume it has to be clutch adjustment, as hydraulic clutches self adjust (so that can't be the cause for me).

        The increasing engine speed on rough terrain was possibly due to one rear wheel momentarily losing contact with the ground. When this happens it will spin freely (unless you have the limited slip diff) and allow the engine speed to rise - so probably unrelated to your gear selection issue.








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        M47 - Grazing in reverse and adjustment to cluth cable 200


        The car should be *completely* stationary. Engaging reverse is very different than the forward gears. When you engage reverse you are cramming one gear in between two others: making the "tunk" sound you mention, which is normal. The forward gears have a "synchro", which helps "synchronize" gears moving at different speeds so they can engage without grinding.

        Clutch or no clutch even in neutral, with the rear wheels spinning (even slightly), one of the two gears you are cramming the reverse gear in between is moving. When a stationary gear tries to engage a moving one, it'll make a "grinding" (the grazing?) sound.

        Try shifting with the car totally stopped. A slight "tunk" sound is also normal when shifting in/out of reverse.

        Hope it helps,
        -Ryan
        --
        Athens, OH -- 1990 245 125k








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        M47 - Grazing in reverse and adjustment to cluth cable 200

        maybe bad flex disc or dirty splines on clutch shaft? usually one needs to adjust clutch cable otherways - worn disc causes clutch disengage too high or even slip...
        --
        i prefer non-german cars







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