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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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clutch problem?

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Old Sep 14th, 2019, 13:32   #1
MAMDaveM
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Default clutch problem?

Yesterday I went to move the P1800S and when I depressed the clutch there was a ping sound and I found I was not able to select gear. it wasn't like it was stuck in one gear, it was just as if it wouldn't "notch" into any gear. I was busy with other things so it wasn't until this morning that I was able to investigate.

Having looked at the manual I saw that there were two springs in the system, and given the "ping " sound I decided to investigate their state first. Both the pedal return spring and the clutch release fork spring were in place and seem to be in OK condition. Next I observed the clutch slave thrust rod as the clutch was depressed and release. All looked OK although there was a lot of rust on the thrust rod.

Then I did what I should have started with... check to see if there was still a problem.... and it all seemed to be functioning OK again.

So my question is, does anyone have an idea on what happened.

Could it be the rusty thrust rod stopping the slave cylinder returning?

Could it a that the selector mechanism has got deranged. As a side note I always find it difficult to select reverse gear without any gear grinding if the revs have not returned to idle.

Any thoughts and ideas welcome.... thanks!
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Old Sep 14th, 2019, 14:35   #2
dingov70
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Hello there , from experience of way too many years in the trade , I would suggest pulling off the dust cover on the slave cylinder and looking for bright marks around the edge of the piston where the push rod MAY have been resting , rather than in the piston recess .

Also pull back the gaiter around the release arm , look to see if the pivot point has worn through the arm and thirdly check the release bearing is seated on the release arm correctly . The arm has " lumps " on the inner face that secure the release bearing to the arm . If worn the arm can come loose and the mechanism works , but incorrectly . Later on the mechanism will realign & you have a strange noise & no clutch action .

Finally the crunching / grinding when selecting reverse is simply due to the gearbox having synchomesh hub fitted , always going to happen , to some more than others . A synthetic gear oil may help , but do not hold your breath
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Old Sep 14th, 2019, 15:41   #3
Derek UK
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Don't know what the ping was, sometimes springs catch up and release, making a sound. Was the noise inside or out? No synchro on reverse so the clutch needs to be completely released to get a smooth engagement. Foot to the floor. You could try putting it into 1st or 2nd before trying reverse but it sounds more likely that the clearance at the slave needs adjustment. The book says 3-4mm, release the spring when checking. 2mm is usually fine, there must be a little bit of clearance to stop the release bearing from touching the diaphragm spring all of the time. If the pedal itself has a lot of free/loose play, that can be adjusted too. Play often caused by the hole for the clevis pin wearing oval. If this is so, replace it. This adjustment also takes care of the pedal pad position, which should be level with the brake pad.

Being an 1800, the lever needs to be lifted to clear the reverse lockout plate on the top of the lever ball socket. Lift the boot and check. The plate might be loose or need a small adjustment.
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