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JKV11

Scura single plate clutch

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7 hours ago, Lucky Phil said:

Your rod has been installed the correct way around but at the clutch end the rod doesnt appear to have engaged the pressure plate button correctly which would mean the rod is in effect too long and possibly holding the pressure plate partially disengaged. This would cause slipping issues.This is one of the issues using a 5 speed RAM clutch with the six speed gearbox. You need to machine down the dia of the clutch end of the pushrod.

To check the correct length of the pushrod once machined,install the gearbox and clutch with the pushrod and the pushrod bearing assembly and the piston and push it as far forward as possible then measure from the piston end to the gearbox face that the slave cylinder bolts to. With the single plate clutch with the original plate( same as I have fitted ) the measuremnt should be approx 18.5 mm. It about 19.5 with a partially worn twin plater. If you assemble yours as before and the measurement is say 14 or 15mm then thats almost certainly what been causing the slip due to the pushrod not seating in the pressure plate button and holding the pressure plate partially disengaged. Look for damage to the gearbox pushrod bearing and piston as well.

If you use the later thicker friction plate you may need to modify the length of the pushrod and also the pressure plate button on pre 2015 RAM clutch assemblies.

 ram clutch plate mod.jpg

Ciao   

EDIT.....here's your answer.......3rd last post by footgoose

 

Thank you very much! So the best way is to instal the clutch, take out the rear wheel, take of the slave clutch cilinder and machine the rod until there’s a little slack.

Kind reagards, Jorrit

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58 minutes ago, JKV11 said:

Thank you very much! So the best way is to instal the clutch, take out the rear wheel, take of the slave clutch cilinder and machine the rod until there’s a little slack.

Kind reagards, Jorrit

Your rod should be the correct overall length give or take. It looks like what you need to do is machine the clutch end dia down and along the length enough until its a slug fit in the pressure plate button and bottomed out. Then check the protrusion as i outlined. It should be close to these figures give or take a little. And then you can do what I did with the Daytona engine and 6 speed with the RAM clutch which is to fit the slave and slide half the drive shaft onto the gearbox output shaft,put it in gear and see if when you pull the clutch it disengages and at what point from the bar and that you have a little freeplay before it loads the pressure plate spring. If it disengages a long way from the bar then the rod is too long and the converse would be too short. 

Ciao   

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