Crankcase oil seals

[robw]

I am aware that the Haynes book of lies shows the seals incorrectly fitted. Could someone tell which way it should be? Is it as a normal seal will be with the face on the outside as you look in ?
Cheers Rob

[Yogi]

Castle side facing out wards from crank mate,looks like its inside out

[Yogi]

Unless mine were in back to front.

[Tone]

The "castle" bits should face inwards towards the bearing as this www.scooterhelp.com/RZ_help/restorations/rebuild.crank.html

[Yogi]

Mine were in backwards then,lucky it's not rebuilt yet,result

[robw]

Cheers for that, the RZ website is very good. So I will using that to help me build the engine in a couple of weeks, once I get my crank from Norbo.

Rob

[Yogi]

Waiting 4 my crank off Norbo. 2',I'm well glad you asked that question,would prob have put seals in wrong as I took pics to rebuild with

[nikfubar]

Feb 5, 2013 21:23:35 GMT 1 Yogi said:

I'm well glad you asked that question,would prob have put seals in wrong as I took pics to rebuild with

You wouldn't be the first ;D

[Denzil]

Hi, the "Scooter Help" web page is fantastic, i used this to build my engine up and it is very imformative and as helped me loads, the only issue i had was on the clutch rebuild bit they said I needed 2 rubber clutch rings total, this is incorrect as Norbo pointed out to me, I actually needed 1 between each clutch plate. Apart from that I would recommend any body buiding an engine to use this as farrrrrr! better then Paynes manual.

[markhoopy]

I bought a crank from Norbo a couple of weeks ago, fitted new seals and was just about to put the top crankcase on when I noticed the Haynes manual showed the 'castle' side of the seal facing out, which was the opposite to what I had done. I swapped it round, built the bottom end, then posted some pics of my rebuild. Mixed emotions when my mistake was pointed out .. pulling the cases apart, cleaning off bearing lock, swapping the seal round yet again, but at least all this was before I had rebuilt the top end, or even worse put the engine back in the frame ..

I should burn the Haynes book, I really should.

[Yogi]

Probably wont be the last either

[Denzil]

Castle bits should face the bearing I.e inside. The Haynes is wrong, the seal won't be able to seal if the castle bits are on the outside.

[Tone]

A while after I got my LC2 I stripped the engine to have the crank rebuilt and noticed the RH seal had been fitted wrong with the castle bits facing out. It didn't seem to affect the running and didn't burn any gearbox oil either. Probably a common error as it even shows the seal the wrong way around in the parts catalogue from the very first LC upto the 1985 F1 powervalve but the 1986 F2 and onwards it shows it the correct way.

Tone

[nikfubar]

I'm sure someone will correct me if I'm wrong but I was led to believe that the seal would work whichever way it was fitted but the reason the castleations were against the bearing was to aid the flow of petrol/oil mixture around the bearing ensuring adequate lubrication but why the seals different on the other end of the crank I'm not sure as this is the one which usually packs up first.

[Deleted]

that makes sense to me nik

[Denzil]

+1

[Tone]

Seem to remember reading somewhere that the LH bearing usually goes first because of the weight of the rotor on the end of the crank.

[garry1366]

I've been looking for an engine rebuild guide just like the one on scooterhelp for the LC, does anyone know where I can find one?

Cheers