5 replies to this topic

[Joepotato99]

Hi,

I'd please appreciate some advice on the pre verto clutch throw out adjustment. I have seen a lot on the forums and youtube but some mixed advice has made it a bit confusing..

I have recently had a new clutch installed along with a lighter flywheel, by a reputable place, on a pre verto 1275.

After not too many miles I noticed that when the clutch pedal was pressed the revs would really substantially drop, to near stalling.

I noticed the throw out stop nut was adjusted so there was a substantial gap between the casing and the first adjustment nut.

- is this likely a case of the clutch being over thrown?

- I have seen in the Haynes manual, it states to turn this nut into the casing with the pedal depressed. Release pedal, then slightly tighten in more. On various forums and YouTube videos others have said make sure you leave a gap, and if you don't then the casing can be damaged. Can any damage result from the nut being tightened up against the casing?

- if there are still symptoms of overthrow, can this nut be tightened in more than specified in Haynes to limit overthrow more?


Appreciate any help.
Joe

[nicklouse]

Press pedal or pull with a long bar/tube.  Wind nuts in till they touch the wok.. Release pedal wind in one flat. Lock off the nuts. Job done. Then set the return stop.

 

a workshop manual is good.

[Spider]

The procedure in the workshop manual is good, though, I do it a bit differently. I prefer to pull the arm out manually all the way until it hits a hard stop. Then wind on the Flanged Nut to the cover, release the Arm, then wind the nut on a further 1/4 turn and lock it off there. The important thing with this adjustment is that it prevents over-loading the Crank Thrust Washers by trying to shove the Crank in to them via the Clutch.

If you have a heavier than standard Diaphragm fitted, compressing that via the Clutch Pedal can be enough to cause the engine to slow when idling, you may have to up the speed a wee bit.

[Joepotato99]

Thank you both for your replies.

I have gone over the adjustment for the arm stop and the throw out stop (with pedal depressed, top hat nut up to the wok, then one flat further). This has improved the situation a bit.

I have the idle set to around 1100, and when pressing in the clutch it disengages fine, but the revs still drop substantially to just above stalling. Is this possibly just down to having a new clutch and light flywheel? It has an SW10 cam installed.

Thanks,
Joe

[Joepotato99]

Is there any harm in adjusting the throwout nut further in than the extra flat, to limit travel?

[timmy850]

If you have it too far in, the clutch hydraulics have enough strength to break the pivot off the end of the clutch arm, and you may not have enough travel to disengage the clutch

As someone who left them a bit loose and they rattled in while driving you definitely notice not being able to select gears, and the sudden hard point when it stops