August 11, 201412 yr Hello Folks,Is it possible to replace the crank seals on a late 340 Sherpa without splitting the crankcases? As I am a tight Scotsman,this would be a right saver,however I'm willing to bite the bullet if someone tells me it would be a good idea to change the mains etc regardless as the bike is still on the originals? Feel free to tell me I'm a miserable penny pinching Jock and just get it done right.
August 11, 201412 yr there's 2 x seals on each side think there £12 x 4 plus you need 3 x o rings speak to inmotion they will put you right. the magneto has to come off as well as the timing plate and on the other side the clutch weight and basket as to come off to gain the seals easy job.
August 11, 201412 yr take care when your taking the old seals out the carriers there only alloy and can easy be damaged. i use a block off wood and tap them out with a drift or socket. there's also a o ring on each carrier it would be a good idea to change this to. on the clutch side behind the weight is your other carrier there's a bush on this side that butts up to the crank bearing that has a o ring behind it also change that to. some times there hard to get off some times there come off easy may need a puller to take it off. if like you say the seals have been on along time the o ring will need changing. is the bike running? Edited August 11, 201412 yr by bondy
August 11, 201412 yr Great description from Bondy! Can't stress enough how fragile the seal carriers are. Good luck!
August 12, 201412 yr that's spot on treat um with great care. and when replacing with new ones they go back to back so the open end off the seals face out. they should just push in be abit hard may need to tap 1 against the other to seat them in i use a rubber hammer or hide hammer pay atention not to damage the seals. hope this helps. bondy
August 12, 201412 yr Author Thanks again,the bike was at a trial last Wednesday when decided to smoke out the venue. TBH it's been off song for a while and I've been warned by a fellow Bultaco owner to get them sorted. The bike had been lying in a barn for 10 years and I just took it out and rode it doing the bare minimum. Surprised it's went so long really. The motors out now,but I'll get someone a bit more patient than me to sort it..
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