Grrrr crank won't go onto bearing

[jonisingt35r]

Hello
I'm trying to fit me new crank onto its bearing but it just won't go I'm trying to fit it onto the left hand main bearing but it just doesn't want to go, I've greased it and given it a general tap,

I'm thinking about putting the crank into the freezer for a while to see if that will help, but then I'm thinking it will be difficult to put the right hand main bearing on

Any suggestions?

Thank you.

[vespasco]

I think you have a PX motor, so

The larger crank bearing is the clutch side.
This fits first, into the crankcase, followed by the seal.
Then the crank.
Which is pulled in from the clutch side... It's possible to use the clutch if you don't have the proper tool.
The smaller flywheel bearing...
Fit the inner race onto the crank
Fit the outer bearing into the cases.
There are more tips if you need them...like yes, use the freezer, and also use a little heat...



See here..scroll down to the 2nd lot of photos
vespa.proboards.com/thread/4738/rally-200-modifications?page=3

[jonisingt35r]

Thank you very much for that

[jonisingt35r]

This is how I'm going to attack my bearings,

Crank in freezer slide onto the large bearing

The smaller bearing was going to gently heat it up and slide it into place

I've orderd new oil seals but can't quite remember how they fit

Will this be OK?

[henri]

clutch side bearing in freezer, heat clutch side cases , drop bearing in an make sure it seats fully down . circlip in ,then seal, dished side to crank . put aside . crank in freezer ,heat flyside inner race ,slip over crank an drive down til theres a 1mm gap between race an crank shoulder . quick bit of hot air gun on clutch side bearing an smear of oil on seal lip an whilst cranks still freezy cold slip it thru bearing. can be drawn through from clutch side ,or carefully driven from flyside . flyside ,bearing outer in freezer an heat cases , drop bearing in an drive it down til flush at the outer end with shoulder in cases .flip cases over an insert seal ,dished/spring side to crank an flush with outside of cases . jobs done ,bearings an seals . H

[bigd]

flyside ,bearing outer in freezer an heat cases , drop bearing in an drive it down til flush at the outer end with shoulder in cases

Read more: vespa.proboards.com/thread/5901/grrrr-crank-bearing#ixzz4J6llDiYb


Unless it's a T5 engine the flywheel side bearing sits just proud of the casing, fitting it flush will crack the engine casing, expensive mistake to make.

D.

[jonisingt35r]

OK how about this then just saw a vid on you tube

Crank in freezer both bearings in oven hot
Slip bearings onto crank making sure they are flush to the body with this be OK?

Just a bit worried about joining both cases together just hope the bearing will just slip.into place?

[henri]

i'd be more worried about how ya get the clutchside circlip an seal in with a crank in the way . can ya post a link to this vid . H

[jonisingt35r]

[henri]

Aah , 4 stroke auto scoot crank , thought it was a fancy full circle lammy crank at 1st , they have forced oil lube so dont use crank seals like 2 strokes . principles the same tho , freeze the 1 an heat the other ,exactly same for flyside inner race .but for clutch side freeze bearing an heat cases . H

[jonisingt35r]

Sept 2, 2016 14:21:44 GMT bigd said:

flyside ,bearing outer in freezer an heat cases , drop bearing in an drive it down til flush at the outer end with shoulder in cases

Read more: vespa.proboards.com/thread/5901/grrrr-crank-bearing#ixzz4J6llDiYb


Unless it's a T5 engine the flywheel side bearing sits just proud of the casing, fitting it flush will crack the engine casing, expensive mistake to make.

D.

OK think I've understood this method, can you please tell me what the 1mm gap is for

Thank s

[henri]

on flyside inner , to sit inner inside fully to outer inside cases , an to aid future removal aswell .H

[vespasco]

The Piaggio spec is actually to fit it 16mm to the top of the inner race to the crank.
Which leaves the 1mm gap on a 15mm bearing.

As H says.

[henri]

had some "yank" insisting the gap was just to aid removal other day ,as if piaggio ever did anything to aid disassembly later . on pointing out no gap meant a 15mm bearing only being 14mm into its rollers , he stated the % of support? this would give an maintained it was well within tolerances? . guys a "IT" specialist in the real world , an i suspect a trump voter , well if he believes fairy tales like he tells he'll believe anything . H

[jonisingt35r]

Sorry a bit confused just making sure.

The bearing which has an internal slip to it should have a gap of 1mm between the edge of the crank?

On my bearing there isn't a gap see pic

[jonisingt35r]

On my crank there doesn't seem to have a 1mm gap it just looks like it fits flush
Should I just fit it flush,?

Thanks

[vespasco]

I would fit it with a 1mm gap.. 16mm high

[jonisingt35r]

OK a 1mm gap from the edge furthest from the main body?
Going to gently heat it up then slip it on my crank is frozen at the moment.

[vespasco]

it would be measured from the small upstand, not the actual crank web

Use a 1mm thick spacer of some kind, so the inner bearing race does not go all the way on when you tap it in place