I overhauled my BW35 (did work but was noisy and in a poor state) over a year ago and it ran fine apart from after the first week it wouldn't go in reverse after a long drive in the summer so i left it to cool down then it worked ok and i later readjusted the brake band and it never occurred again. A few oil leaks had appeared and as i pulled the engine to do the core plugs a couple of months ago i had another go at leak prevention on the BW35. During this i found some flecks of metal in the sump so pulled out the front clutch and found the metal was coming from damage to the hub ( i think i probably overlooked this on the original overhaul) so i sourced a good second hand one , i measured it to be within 0.25mm same as the original and the piston that came with it had a ball instead of a reed valve so i kept the piston matching the hub. All else looked fine in the trans.
Now i fitted it, set it up and it goes forward in neutral , reverse will go if you give it some revs but doesn't like it as it seems to be fighting the forward momentum , i have readjusted and double checked everything, after a few hours only conclusion i came to was the front clutch must be stuck so i pulled out the trans and found the front clutch was not stuck, i can turn the front shaft with grips whilst holding the output shaft so it may be tight but definitely not stuck in fact the whole trans looks fine nothing seems amiss. I did try the air test , the servos worked fine but couldn't really hear the clutches engage but it did throw the front clutch hub forward when i had the pump off and the front clutch piston moves freely if air is applied directly. Not sure what to try next.
Now i fitted it, set it up and it goes forward in neutral , reverse will go if you give it some revs but doesn't like it as it seems to be fighting the forward momentum , i have readjusted and double checked everything, after a few hours only conclusion i came to was the front clutch must be stuck so i pulled out the trans and found the front clutch was not stuck, i can turn the front shaft with grips whilst holding the output shaft so it may be tight but definitely not stuck in fact the whole trans looks fine nothing seems amiss. I did try the air test , the servos worked fine but couldn't really hear the clutches engage but it did throw the front clutch hub forward when i had the pump off and the front clutch piston moves freely if air is applied directly. Not sure what to try next.
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