I have used jbweld on the sealing surface of my crankshaft. This is in response to a few suggestions online that state that you can sort the problem of nicks and scratches by filling it in with jbweld and sanding it back with a 600+ grit emery cloth. I have sanded it back using upwards of 1200 grit for an extra polished look.

I was wondering has anyone successfully used jbweld to fill gouges, nicks and/or scratches on the front crank sealing surface for any period of time, as there are no real documented successes or failures online, or that I have heard of using this approach. The only real feedback that I have read is advising against without any real trialling of this approach.

The thing that gives me the confidence is that I took photos (I dont have them anymore) of the crank sealing surface with the jbwelded areas to a crank/machine shop specialist and he stated that it wouldnt be a problem, because he believed with a fair amount of conviction, that the lip of the crank seal rides around a circular ring that is a few mm away from the flange of the crank and is indented into the crank, which was created by the actual original manufacturer. Could someone clarify if this correct, thereby rendering the notion that the oil seal runs on a smooth surface even stock from the manufacturer (I do recall speedi-sleeves do have this indentation as well)l


In addition to all of this it is a 3sgte engine with a new oil pump so I am wondering if the oil pressure would have any bearing on whether or not this would be a successful approach.

Please also keep in mind the crank sealing surface beyond where this ring lies is for the dust seal part of the seal. This is what the machinist has stated Is this correct?

I also have manually tested the seal by brushing some oil up behind where the seal sits when its housed in the oil pump, when the sump is removed, and none seeps out, when i turn the crank. However, I am wondering if the seal is subjected to real revolutions of the crank, particularly with the presense of crankcase gases, and an increase in oil pressure under load that it could cause a problem.

I'm am being fairly meticulous about this as I really dont want to have to tear out the engine later, etc, due to some oil leak as mr2's are nasty to work on in the car

 

Might be best to check on MR2oc.com

I would never use JBweld on the crank.

 

Consider the design of the lip seal which rests against the crank snout.. It's purpose is to seal to the crank, not JB Weld. No matter how much yo sand JB, it's still a rough surface.
If you are as meticulous as you state then repair your crank the proper way.

 

I would rather put a sleeve on the crank rather than JB weld it...But that's just me.

 

x2 google Microsleeve.com or look on here, I have referenced these in the past and they work very good.

 

jb weld is for cheap temporary repairs

 

Jb is really for temp repairs... I wouldn't glue 2 pieces of wood together for more than just the ride home. Gives you a false sense of security thinking you "fixed it" when all you did was buy yourself some time.

Fix it right the first time!

 

^^^ You do realize this thread died a month ago.........

 

Shoot looks like it's alive again thanks to you n me...

 

No, it died......

 

Rip!!!