Installing main bearings in a Vespa engine

I haven't seen anybody use this method yet. I am too impatient to put things in the freezer overnight and don't like feeling like I'm in a race against time to keep the bearing cold. This method obviously works quickly and easily if you're careful. Playing with a torch and liquid CO2 is obviously dangerous. Both can cause you quite a bit of pain if you're clumsy.

[@btpnlsl]

Thanks for this video. I've rebuilt three engines and I've always struggled with getting the bearings in true, even with the right tools and the freezer/oven method. I just installed the clutch side bearing on a P125 using this method and it was so much easier. There is nothing more satisfying then hearing that 'click' when you are able to just drop the bearing into place!

[@FEETLE]

AWESOME METHOD .... i actually use this to remove and install my ball joints and replace my front bearings on my 1994 Honda accord... simple high school science.... thanks for the VID

[@srgore67]

Great tip on freezing those damn bearings. I had mine in my freezer for hours and could never get it cold enough to get in my cr125 case. I just happended to have two cans of air in my garage and this froze them in seconds. NICE JOB!

[@mtnegm]

This is a great way i have read a couple of people giving you negative feedback however i have rebuilt a few engines but there always a little poo so this method is great, i appreciated the time you have taken to show us inexperienced engine rebuilders :) i will be trying in today!! thanks pal.

[@lyvid]

Nice job! "No need for an hammer". I don't freeze the bearing because it goes to it's place pretty easily (try it ;) ) no oven either. The original tool to place the bearing was an electrical resistance wheel-shaped, that heated up the case and then you'd put the bearing in there ;) Btw, to the crankshaft, if you don't have the apropriate tool, you may try to pull it with the clutch (tightening the nut on the other side). That way you know it's centered just fine. Keep going!

[@anthonylynn1969]

i remember when you had to drop gudgeon pins in liquid nitrogen to shrink fit into pistons. good video, don't know why people knock you or others that put videos up helping others 10/10

[@kiwi90ss]

Great work mate. Would be keen to see more from your engine rebuild.

[@lyvid]

After that, to close the engine, just fit the two cases togheter and keep closening them closer, moving the crank (because of the oilseal from the ventilator side) and kickstarting it (by hand :P) so it gears up, and fits nice and weel. Good luck ;)

[@dkaloupis75]

NEVER EVER HEATING THE SURFACE WITH THE SEAL RING! NEVER ! EVER! PERIOD!

[@TheNoisePolluter]

2 people melted their oil seals and had to hit bearing in with hammer.

[@Vegane_Atombombe]

Well done. Good job but this method isn't something special. I've done it many times this way. But your video is pretty helpful for people with less experience.

[@cracknelldavid]

That is brilliant. Never seen it done so smoothly. One question: is there are correct/incorrect orientation for the bearings in Vespa engines? ie. Do the main bearings need to go in with the side with the serial numbers facing you or the other way? Are the chamfers, if any, significant to the way the main bearings go in?

[@americanzoomer]

Awesome job man!

[@iowancamera]

Furthermore, you can't install these engine seals from the outside. It's an older 2 port engine from the 1960s.

[@DONphantasmo]

YEP. I agree with everyone.. Great job!!!

[@putang31]

job well done nice to not see a hammer

[@snnnoopy]

But how did you get the bearings out to begin with?

[@iowancamera]

I'm the the old pros think I'm crazy, but that stuff gets things so much colder than the freezer.

[@btpnlsl]

There is a factory bearing puller set which makes the job pretty easy. Check out the Scooter Works web site and search for Bearing Extractor

[@BillyBeatbox_BdaBX]

Thanks!

[@YUNGSWACKY1388]

hey I have a 2 stroke Honda dio 50cc. everytime I crank it over the bearing stip out of the case and jam off on the other side of the case. what could be the problem there.

[@charley586]

Nice method... do you think it would work to pull out a bearing without damaging it?

[@Dkkbulletsmile]

I really like to rebuild a Vespa but i dont have any knowledge of how to do it. is there any instruction DVD i can buy? p.s. rebuild i meant the whole thing like rebuild the engine, the body, wiring them even how to pain them. thanks for the answer!!! We are Mods!!!!

[@eheath23]

Is a blow torch not dangerous when dealing with something that could potentially have oil on?

[@xinixxagnix201]

Never use a open flame....

[@99Jazzman99]

Not possible on this Vespa engine, I'm afraid. The seals have to be mounted first.

[@iowancamera]

Engine still runs and doesn't leak, so what are you on about?

[@broadband01]

put in freezer overnight in a plastic bag is best :o)

[@harryzampetakis7279]

Why apply heat with the seal installed? 🤔

[@lllViperlll]

yah thats the method

[@dc5nyc391]

That's awesome!

[@yourself503bfu]

Very nice.

[@clauzpedersen3593]

Thank u so fucking much dude!

[@SuperSte19]

mai scaldare i carter con i paraoli montati

[@phren0]

son daccordo.

[@amicovespista]

tutto questo casino x mettere un cuscinetto...

[@jupvan]

This is not the best idea. You can crack your engine with this. When you heat up your engine, put ist in an oven with 100 celsius / 200f for 10min, without ! the seals! First new bearings , than the seals !

[@comments-amazing3015]

Idiot!