Modern Vespa

Hello everyone, was hoping you can help me out? i was just wondering if any of you might have pics of have youtube video link of a 180ss rebuild? My engine is disassembled but I didn't take pics of which way the seals/bearings went in or how they should be facing?
Thanks in advance.
Fab

Bump....anyone???

Here are a few from 'search'
Oil seal on 180SS crank
180ss rear hub seal leaking...hlp
VSE Clutch side seal intstall -- now bearing rub

Correct. All 3 crankshaft seal springs/lips face the crankshaft.

The clutch seal goes into the case before the clutch bearing as there is a outer lip on the seal that sits directly in the case opening. The clutch side bearing pinches/seals that lip into the case.

Grease pack the fly-side bearing. It lasts a very long time and can be cleaned out and repacked if necessary by removing and replacing outer seal. I have had no issues for over 25 years with proper maintenance. It's not a design flaw.

The GS160/SS180 engines are over built and very robust.

Endoftheroad, thanks for the info. I managed to find s video, wasn't sure if the info/technique was right?


https://youtu.be/MFl4U_-in58?si=zgV7l9wspnFO-Yxj

Is this a good reference? Is all that grease that he applies in the bearings good to do?

Was going to heat up the cases as well as freezing the bearings fist to get them in easier? Can i use the old bearings to help hammer in new ones?

There is a small, recessed bearing (on flywheel side of case (between crankcase and rear hub)...what's the best way to get that out??
Thanks
Fab

Video looks OK. The little bearing can be removed with a blind bearing puller, I guess, but packing it hard with bread and smacking that with a dowel has worked for me.

Moto64....not sure I understand what you meant, about removing it??

Is this the smaller, recessed, centre bearing i was referring to? Can i also spray it with brake cleaner, try to clean it out, then just repack with grease?

Three shafts : Crank, primary ( or layshaft) , and axle. The primary end bearing in the case looks to be a blind needle bearing like this ? It has been enough time that I forget what is in mine. There are ways to remove it as I stated.

https://www.scootermercato.com/Scooter-Parts/Bearings/52761

I was only talking about the crankshaft seals and greasing the fly-side crank bearing.

If the tree and rear axel bearings are in good shape, you can clean them in place and lube them. All bearings need to be lubed on assembly.

The kickstart gear should be lubed well too or it can dry-bind and fuse to the tree causing a major problem.

Some of the transmission bearings can be hard to source, so make sure you have them before you tear them out.

Endoftheroad....
Yes, as i saw in the video link i posted, install (clutch side) big seal(facing inward towards crank), put grease on big bearing, install bearing, pack with grease then place sir clip. Install rear hub bearing, install large castle/nut, install seal then 1/2 moon shaped sirclip.
On flywheel side of case, install caged-bearing, pack really well with grease. Install crankcase seal (spring facing towards the crank.
Install caged bearing in the gear selector place.
The issue i have is how to get out the tiny (caged/covered)bearing in between the crankshaft and gear selector. Do i need any special tools to get it out?
Thanks
Fab

This works.

&t=68s&ab_channel=KincadePavich

Is this for real 😳😳😳
What tool can be used though?

It's this bearing[/img]

I would clean that up, use some fresh grease and leave it if it looks good or you know it was working fine.

If its bad and you have a replacement, I think you can push that brass colored "top hat plug" out - from the outside to the inside and past the bearing. Then you can use a small drift/punch to gently knock out the race and bearing. You will probably destroy the bearing doing that though. I'm doing this by memory. I have done this a number of times rebuilding these engines but its been 4 to 5 years...

Assembly would be install top hat then the flat washer and then the bearing and race.

I have replaced them but most of the time the transmission bearings are OK. It's the crankshaft bearings that take the most RPMS and beating.

yes

I put the end of the primary gear into this bearing and spun it by hand to see how it worked. It was a touch rough for a split second and then it smoothend out right away (some grease got in the rollers again). There is an ever so slight bit of play (wobble), but it's minimal. I. Think once everything is in there and tightened, it should be smooth.

IIRC, SIP sells a puller for that bearing... if the bread trick doesn't work.

Just be sure to put something under the case directly underneath the bearing.

I found this link helpful for the SS engine tear down

?si=_BzpfBYKL5Sllstd

Hey guys, so if i want to keep the original bearing in there (i think it's still good). What's the best way to get all the old grease out of there?
Thanks
Fab

You could flush it with some parts cleaner ( watch your eyes !) and compressed air. A bit of grease in the cup is good but the bearing is lubed by the gear oil.

Ok, was thinking of spraying some brake cleaner in there, blow it out with compressed air, then repack it with grease.