Jump to content

Montesa Tapered Primary Gear Removal


thedktor
 Share

Recommended Posts

 

 
The only other thing I thought of after looking at the photos again was to make sure your puller contacts the back of the gear evenly so you don't damage the ends of the teeth.

Yes, agreed! And when using a finger type puller I always clamp the gripping ends so they cannot open up and damage the item being pulled, and/or you :D

Link to comment
Share on other sites

 
  • 2 weeks later...

Ah fun and games. First attempt with moderate heat and the gear refused to budge.

Second attempt today with a LOT more heat, plus freezer spray and the goddam thing still refuses to move!

Frustrating to say the least - I have everything else off ready to split the cases. I have paused for now, not really sure what to do, but got a couple of engineering friends to seek opinions from.

I have been using a 3-legged puller, with legs strapped together so they can't open up, and done the thing up as tight as possible. Heated the gear, cooled the crank, tapped with hammer on the puller, all the things that would normally move a flywheel....

Steve

Link to comment
Share on other sites

 

Sounds like you're covering the bases..........dunno.

I haven't tried mine yet, but I sure hope it comes off easier than yours!

I think I read that someone heated the gear hot enought that it was almost glowing? Hummm, wouldn't that take the temper out of the steel?

I'll be fabbing up a puller myself, Sounds like it ought to be a big-ass strong puller to do the job. Do you have the means to fab a puller that'll allow more torque and thus pulling power?

Link to comment
Share on other sites

 
Sounds like you're covering the bases..........dunno.

I haven't tried mine yet, but I sure hope it comes off easier than yours!

I think I read that someone heated the gear hot enought that it was almost glowing? Hummm, wouldn't that take the temper out of the steel?

I'll be fabbing up a puller myself, Sounds like it ought to be a big-ass strong puller to do the job. Do you have the means to fab a puller that'll allow more torque and thus pulling power?

Yes I wouldn't put too much heat into the gear. I'm using a hot air gun so doubt it would get it glowing!

I cannot make a puller myself, but the friend I bought the bike off can! so that is the final option....

Steve

Link to comment
Share on other sites

 
 
 

FINALLY !!!!!!!!!!!!!!!! :rolleyes::D:D

Yes the gear came off at last, 3rd attempt. Here's my setup:

kdk_0916.jpg

Note chain clamped round the puller to stop the legs opening, and I used some foil from a pie(!) to shield the crank from the hot-air gun to try and stop it heating up as much as the gear.

The puller was as tight-as, creaking alarmingly, and then just kept tapping the end with a hammer, loosening again so the legs could clamp up tight again, as even with the chain clamped tight they were moving out a little with the knocks, then tapping some more.

And off she pops, after some time!

kdk_0919.jpg

Blimey, that was hard work

  • Like 1
Link to comment
Share on other sites

 

I see you have a special left-handed Cota 349 there with the primary drive and gearshift on the left side. That must be a rare one!

Congratulations by the way. Good to see you are getting closer to getting it running right. I can feel for you as I went through similar on my 348.

Link to comment
Share on other sites

 
Congratulations by the way. Good to see you are getting closer to getting it running right. I can feel for you as I went through similar on my 348.

Thanks! Yeah it was very frustrating for a while.

Next difficult task needs a new thread...

Steve

Link to comment
Share on other sites

 
BANG! Omygodwherethef%$$didthatgo!

+1

hehe, yup i was there last month. used a three-legged puller with the legs chained up.

In the end went for the get it as tight as you can, then using the longest bar you can, carefully approach and give it 1/4 turn, sweating - usually with eyes shut. retire to safe distance, wait 5 mins and repeat.

On the 4th or 5th 'turn' the aforementioned BANG, jebus where the "

Link to comment
Share on other sites

 
  • 2 weeks later...

I have just picked up a s/h 349 bottom end, which hopefully has better gears than mine.

The only problem is............. the flywheel and tapered gear are still attached, which means having to go through this trauma again!!!!!!! ;)

I have been advised that the way to get the bleeders off is a hard hit on the end of the puller. Not a tap, but a bl@@dy hard wallop with a big hammer.

I did hit mine quite sharply last time to pop it off and I'll stick with the normal hammer and see what happens....

Steve

Link to comment
Share on other sites

 
 

No, use a big heavy hammer as its the jolt that gets the gear off . I have just removed the same gear off of my 247, i just used two long tyre leavers , one being pushed by my knee and the other by hand and i walloped the crank end with a thor copper and hide hammer once and it came off

Dave

Link to comment
Share on other sites

 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...