flywheel side bearing

[ozzy]

i've only built a couple of small frame engines, normally (if i remember rightly) the flywheel side bearing slips over the crank shaft snuggly but doean't require much 'persuasion' to get it off or on the shaft?? (or maybe thats just lardy frames??) why then does my brand new bearing not want to go on my brand new mazz crank? my (shitty) calipers say they're the same size but it wont have it, the clutch primary side slips on nicely.... i've been called 'ham fisted' in the past and am desperately close to pulling the f**ker on with a nut and big spanner but evrythings so nice and new, and i don't want to brutalize it shall i cool the crank, heat the bearing and go for it??
o

[willspeed]

got the same problem with my PK, i tryed hitting it from the other side with a soft mallet with a nut on the end, and i have managed to bend some of the threads looks reparable with a thread file, but am having problems finding the size, anyone know ?

[hank]

think if you heat the bearings, you fuck them up i always put them into the freezer and heat the casings or whatever they are going into.

[unreliablesc]

get a 2-piece roller bearing mate, makes life so much easier when you have to replace those broken gears in the future...

[willspeed]

My dad said a little bit of heat on bearings if fine, just dont heat them untill they glow

[hank]

willspeed said:

My dad said a little bit of heat on bearings if fine, just dont heat them untill they glow

dont let them turn bluey black though i didnt heat any of my bearings when i did my rebuild last year.

[darkryder]

This has always given me headaches, until I bought a ETS engine with
the split bearings, uhhh nice!
But for those one piece bearings i find the best way is to heat the inner part of the bearing (were the cranck goes through) with a small blow torch and cool down a bit the cranck in the freezer.
Another idea is liquid nitrogen just sink half of the cranck in it and straight in to the bearing ;D ( I saw something similar on TV when they make engines and they are fittings valves )

[ozzy]

cheers aston,
that was my plan, i was just curious as to why one side slipped on so nicely with almost no effort and then the other is such a pig...
ta, o

[monza]

the couple I have done i froze the crank in the fridge overnight and heated the bearing up with my propane torch slightly and the whole thing went in nice and smooth.