Hi,

I have a straight cut transmission (Type E, converted with straight cut gears).

When I let the clutch slip (like on a normal car) slowly, to get the car moving from a stop the whole car shakes very badly and it is barely (if at all) moving.

What is helping a lot is to blip the throttle a bit, just before letting the clutch slip very quickly.

Once the rpm are a bit higher the clutch grabs and the car starts moving like it should.

To get the car going this procedure is very annoying, especially during stop&go and city traffic.

Now I am asking myself if this is normal with straight cut transmissions or if my clutch is just dead?

How do I get rid of this problem? Should I install a "normal" transmission or will a new clutch solve the problem?

Or should I just raise the idle rpm?

I appreciate your help!

[Edited on 13/6/16 by reb]

Sounds like the clutch to me. Had exactly the same symptoms on my doblo and found the clutch was worn out and the dmf was fubared.. Although I doubt you have a dmf it still sounds like a weak or worn out clutch.

Also have you checked the cable/pedal for binding??

Did you check the presence/condition of the spigot bearing when fitting the updated gearbox?

Yep, definitely sounds like a clutch-related issue.

Straight cut transmissions work just like normal (helical cut) ones, only much noisier. In terms of power transmission, they either do or they don't - they can't really 'slip'.

Dog engagement transmissions (which S/C boxes often also are) engage the gears in a different way; they're more reluctant to select a gear from standstill (you sometimes need to slip the clutch a little to let the dogs fall into place), and they're prone to jumping out of gear if the dogs are worn, but neither of those symptoms reflect what you're describing.

Sounds very much like the clutch to me .

Thanks for all your effort helping me!

The car already had the straightcut transmission installed when I bought it.

Is a spigot bearing and a pilot bearing the same thing?

I will also check the clutch cable and pedal for binding.

Sounds like a contaminated or distorted clucth driven plate.

Distorted clutch plate or broken spring/s in the clutch plate



A spigot bearing fits in the end of the crankshaft