Pilot Bearing depth?

[sdycke]

Does anyone know the proper depth to install the pilot bearing? Solutions suggested measuring the depth of the old one and matching that. Good, but what if the bearing (spun) came out with the input shaft as the trans was pulled? Would installing it until it shoulders at the bottom of the hole be too far? Would using the J-tool solve this problem automatically? Thanks in advance.

[Marc Haibeck]

You should drive the pilot bearing in until it seats at the bottom of the bore. That will be about 14 mm deep.

Note that a bronze bushing often comes loose and spins in the crankshaft. Installation of the bushing with bushing retaining compound will not solve the problem. I recommend to use only the roller pilot bearing. It will never come loose. GM PN 14061685.

[sdycke]

Perfect. Thanks again.

[Dynomite]

Originally Posted by Marc Haibeck

You should drive the pilot bearing in until it seats at the bottom of the bore. That will be about 14 mm deep.

Note that a bronze bushing often comes loose and spins in the crankshaft. Installation of the bushing with bushing retaining compound will not solve the problem. I recommend to use only the roller pilot bearing. It will never come loose. GM PN 14061685.

All measurements from the surface of the rear of the crankshaft (bottom arrow).
The depth to the plug is 34.90 mm (top arrow).
The depth to the raised bottom of the pilot hole is 31.75 mm (Second arrow from top).
The depth to the raised portion of the pilot hole (the pilot bearing housing in the crankshaft) is 9.5 mm (third arrow from top).
The height of the Roller Bearing (width of outer race) is 17.45 mm.

So......I am assuming the new roller bearing pilot should be sunk in past the raised portion of the housing (third arrow from top) about 4.5 mm or .175 inches.
In other words just a bit past the raised portion of the pilot bearing hole. This would put the other end of the pilot bearing almost exactly to the raised portion near the bottom of the pilot hole at 31.75 mm (second arrow from top).

Using a Blind Hole Slide Hammer to easily pull the old Pilot Bushing.


The height of the Roller Bearing is 11/16 in (17.45 mm) ....... The face of the Bronze Pilot Bushing I removed
.................................................. .............................................was even with the reduced diameter of the bore.


Blind Hole Slide Hammer.

[We Gone]

Just be sure and use a puller to remove the old one, Do Not use grease or pack wet paper towels in to remove it as with a normal crank you will drive the oil plug out of place on the LT5 crank.