Pull Type Clutch Won't Disengage

[Trex]

Bump.

Mates having the exact same problem with his pull clutch. Looking for internet help before I have to pull the box out myself  

It will grind all gears, but will eventually go into gear.
Engagement is all the way to the floor.
Brand new single plate clutch with flywheel.
Master and slave were never separated.
Made a 4mm spacer for the slave to get full travel and it still won't fully disengage.

This seems to be a pretty common problem, with no resolve.

[Trex]

How did you fix it? @iruvyouskyrine I can't PM you.

[iruvyouskyrine]

So I went from an RB25DET Neo bottom end to a RB30E bottom end. Gearbox/clutch/slave/master were all the same components.

Turns out that the crank in RB30's must be lost than RB25 as what was happening was the sleeve over the input shaft (the thing the throw out bearing sits on) was pushing on the centre of the clutch disk and pushing it into the Flywheel, providing drive even when the clutch was disengage.

So the clutch fork was moving fine, the pressure plate was being released no problems, but because the clutch disk was bent pressed against the Flywheel it was like it wasn't working.

So I got a small Dremel and cut about 5mm off the end of that shaft, put the box in and never had any more issues.

[iruvyouskyrine]

RB30 crank must be longer**

[Trex]

Thanks for the reply. Interesting and funny it was just enough not to work, but bolt on fine.

I think there may be a problem with the throwout bearing on this one. As there is a clip collar (circlip) that the fork bearing slips into and it is meant to hold them together? I haven't seen a gtr one before.

 

My theory is, if the circlip is damaged the fork bearing will grab a little and then pull through.

[iruvyouskyrine]

I don't think there is a circlip on a pull type clutch mate

[Trex]

Sorry, circlip is the wrong terminology. Clip ring?

 

I should stop theorizing, and just pull the box.

[wildeagle44]

On 27/08/2017 at 9:13 AM, iruvyouskyrine said:

So I went from an RB25DET Neo bottom end to a RB30E bottom end. Gearbox/clutch/slave/master were all the same components.

Turns out that the crank in RB30's must be lost than RB25 as what was happening was the sleeve over the input shaft (the thing the throw out bearing sits on) was pushing on the centre of the clutch disk and pushing it into the Flywheel, providing drive even when the clutch was disengage.

So the clutch fork was moving fine, the pressure plate was being released no problems, but because the clutch disk was bent pressed against the Flywheel it was like it wasn't working.

So I got a small Dremel and cut about 5mm off the end of that shaft, put the box in and never had any more issues.
 

Sorry to re bump

 V

but i think im having the exact same problem. Did a crankshaft swap in my motor. Bolted it all in and together but cant select gears when its running. 

Had the box back out, rechecked clutch, fork, bearing etc and all were good. Put back in and no good.

When you say 'cut 5mm off the end of that shaft' what shaft are you referring to? The crankshaft? Input shaft?

If you could describe it a bit more that would be great. 

[iruvyouskyrine]

The shaft that the throw out bearing sits on. It covers the input shaft of the gearbox. And it probably wasn't even 5mm,more like 3ish

[wildeagle44]

Legend thanks mate. Will pull it all out again and recheck

[Ben C34]

You need to measure from the block to the throw out bearing face , and on the gearbox side from the belhousimg block mating surface to the throw out bearing and figure out what is going on.

[iruvyouskyrine]

meausring is for dummies. Just keep pulling the box in and out and change one thing at a time until its fixed