Crankshaft gear slipping

[akghound]

I thought that the cam was broken or the cam gear was bad but .... Ho No! The crankshaft gear has come loose and is slipping. The crank spins inside of it.
I have things partly torn apart but can't seem to get the roller bearing to come off the crank. Is there a trick to do this? Do I have to pull the crank out of the engine?
Ken Gardner

[Crofter]

I think it would be much more trouble and risk of damaging the other bearings or springing the con rod in attempting to get the gear side bearing off while in the engine. I believe the crank timing gear is usually a strong interference fit also and if it has spun  you may have to do some work on the crank surface to get a replacement positioned and firmly fixed in place.

If the bearing is tight against a shoulder it is often impossible to get any means of pulling it without destroying it. Often involves torching or grinding through the race. Be carefull of shrapnel if you hammer. My guess is you will need to have the crankshaft out.

[Ronmar]

I don't think I would try and pull a TRB with the crank in place for the reasons Crofter mentioned.  If the gear is spinning, it hasn't spun for long as the engine quit as soon as the gear/timing shifted.  To have spun so freely so quickly, I would guess that the crank gear probably cracked and is just setting on the crankshaft..

A little heat applied to the bearing inner race might help it to slide a little more easilly.

[Geno]

My crank was out when I replaced the TRB's. IIRC I pounded the old ones out with a drift. I do remember the new ones being a tight fit. A pipe that's just the right size would have made the installation easier. I've never touched the crank gear

Thanks, Geno

[JohnF]

When I changed the TRB's in one of my engines I had to torch the old ones off.  I wasn't too interested in getting them of in one piece though, just wanted the job done fast....

[akghound]

Somehow I ended up with two threads going on this. I posted some pictures on the other rhread and will keep things updated over there.
http://www.microcogen.info/index.php?topic=502.0
Ken Gardner

[Crumpite]

When I changed the TRB's in one of my engines I had to torch the old ones off.  I wasn't too interested in getting them of in one piece though, just wanted the job done fast....

Question for the day:

What the heck is a TRB???

Thanks,
Daryl

[Ronmar]

TRB = Tapered Roller Bearing...  The original CS listers used large soft metal bushhings that had oil fed to the top via the plunger type oil pump.   

[WGB]

Took me some time too Daryl 

[Crumpite]

TRB = Tapered Roller Bearing...  The original CS listers used large soft metal bushhings that had oil fed to the top via the plunger type oil pump.   

Thanks, that clears up several other questions I had on this series of posts !

Daryl

[vdubnut62]

This may fall into the "Hey ya'll watch this!" Darwin Award category... Try it at your own risk.
An old guy showed me the fastest way ever to remove a bad TRB that was pressed on a shaft.
Get rid of the cage and the rollers, lay the shaft and race on an anvil, COVER IT WITH SHOP TOWELS!
Knock the piss out of it with a big hammer. The race will crack and be easy to remove.
Yes I thought it was dangerous as hell too, and I expected shrapnel everywhere, but no, it just cracked. I have removed a bunch of wheel bearings this way since, and yes I can still get through a metal detector, and I still have both eyes! Knock on wood.

Ron

[Crofter]

My mother took a piece of shrapnel to the grave with her! No she wasnt in the army; she was holding something for Dad that he was driving apart..! went into the bone of the right shin, so could have been in lots of less convenient places. I got one removed from under my nose from hitting something hard with a carpenters hammer.

If you will trade the towels in for a bullet proof vest......, maybe, but you still won't be able to see what you are hitting clearly. I think the military calls that "corollary damage".  Unless the shaft under the race is hardened too, you will transmit dinges to it.

That is the extreme of tempting the gods to smite you.

[mobile_bob]

i too carried a piece of brg splinter in my upper cheek under my right eye for a bit over 20 years before it was finally forced
up into a pimple that i could pop and get it out.

i have known several mechanics having to go in and have such cut out, one of which was part of the head of a ballpien hammer
that went in about 2" into a friends thigh, clear through a new pair of levy's too.

i don't like beating on hardened stuff anymore, i figure my guardian angle is getting too old to be johnnie on the spot these days.

bob g