12 replies to this topic

[d4v1dtyler]

Just been driving my mini about, after completing its rebuild. Both the engine and gearbox were built at the same time.

The gearbox was built with all new bearings and baulk rings. We inspected the syncros and they looked fine so we didnt replace them. The gearbox had also only done about 20,000 miles so they werent high mileage bits anyway. Went driving in it yesterday, and it really crunches going into 2nd Sad I think it mainly when gearing down, but does it occasionally when going up. If the engine is just ticking over and i put it into 2nd then everything is fine and it makes no crunching at all. What do people think?

[day101]

yeah i get the same with mine, i think its just a mini thing

[minimender]

Just been driving my mini about, after completing its rebuild. Both the engine and gearbox were built at the same time.

The gearbox was built with all new bearings and baulk rings. We inspected the syncros and they looked fine so we didnt replace them. The gearbox had also only done about 20,000 miles so they werent high mileage bits anyway. Went driving in it yesterday, and it really crunches going into 2nd Sad I think it mainly when gearing down, but does it occasionally when going up. If the engine is just ticking over and i put it into 2nd then everything is fine and it makes no crunching at all. What do people think?

I think the clutch may be dragging a bit, have you bled it propperly ?

[d4v1dtyler]

Yup pretty sure i have bled it properly. If i havent, wouldnt it crunch on all gears? Is there adjustment in the clutch? Its a verto clutch.

[minimender]

Clutch drag is sometimes caused by the plate centre splines sticking in the crank and not sliding propper.
Happens if worn and play between clutch (even new) and crank gear splines.

[d4v1dtyler]

Clutch drag is sometimes caused by the plate centre splines sticking in the crank and not sliding propper.
Happens if worn and play between clutch (even new) and crank gear splines.

ok, there was definately not any play, but could well be the splines sticking. Will this loosen over time?

[minimender]

Clutch drag is sometimes caused by the plate centre splines sticking in the crank and not sliding propper.
Happens if worn and play between clutch (even new) and crank gear splines.

ok, there was definately not any play, but could well be the splines sticking. Will this loosen over time?

Maybe not....might be lucky.
Best if you can to strip and copperslip the splines rubbing any excess off fitting just the clutch plate and working the plate back and to before taking off and reassembling. If not you will have to live with it I'm afraid.

[Ethel]

With the engine running, but without using the clutch pull the gearstick towards 2nd, if you can feel it trying to engage (compare it to the other gears) suspect the synchromesh.

Sticky clutches are normally most noticeable in reverse as there's no synchro.

Another test... find a gentle slope the car will just roll down, reverse a little then hold the clutch down: if it's more reluctant to roll forwards suspect the clutch.

Edited by Ethel, 06 January 2008 - 07:41 PM.

[Guess-Works.com]

Agree with Ethel... if the clutch was dragging you'd get a nice grind going into reverse...

Unfortunately it really does sound like either the baulk ring or gear friction surfaces have worn to the extent that friction is not taking over before the dogteeth try and engage...

You're only real option is to pull the box.

[minimender]

Your not using thin synthetic oil are you ?

[pedros]

would double de clutching work, my old 74 used to do it on second so i just perfected double de clutching as i didnt have the cash to fix it.

[minimender]

I would say yes.
If you are trying to squeeze into second at thirty for instance, there is a lot of strain on the syncros, you can hear the box squeeling sometimes so its best to double declutch....It's an old design remember