c4vette90

I can find everything I wanted to know, plus what I don't, about the IMS bearing replacement. I have my engine down to the short block. I need to replace the intermediate shaft. Is there any way to split the block in a way to replace the shaft without pulling the pistons from the cylinders?

Thanks Everyone!

Schnell Gelb

It may help if you clarify why you are replacing the entire shaft and not just the IMSB.
If you mean you want to remove the shaft to pin the sprocket, that is a different issue.
Having got so far, it may be wise to inspect the bores for scoring.If you do, read up about pinning the piston rings.
The rod bolts need upgrading anyway.

c4vette90

IMS bearing failed. I have engine tore down to the point of splitting the crank case. The shaft itself suffered damage on the bearing end causing the need to replace the shaft. No scoring to cylinder walls of any kind. Seems the final failure of the bearing occurred upon shutdown due to bearing had not come completely apart. Engine only has 12k miles on it.

What do do you mean by pinning the rings?

Schnell Gelb

The rings must remain in their current orientation .

c4vette90

Can the block be split to replace the intermediate shaft without the pistons being removed from their bores? If I don't have to buy the expensive wrist pin and circlip tools I would rather not.

Byprodriver

Not A chance. IMSB at bottom of pic.

Porschetech3

No, bank 2 pistons WILL pull out as the case is separated , unavoidable, bank 1 COULD stay in but you may as well remove them after the crank carrier assembly is removed to acccess IMS to look at them and put in new rod bolts.

Schnell Gelb

And new head studs and...and ... Not a nickel and dime project !
Easy to resell the Baum tool kit here.