Pilot Bearing Issues.

[S13Ryan]

So I just found out ever since I put my rebuilt KA in my car about 20,000 miles ago it had a pilot bearing.

Since the rebuilt motor has been put in its been through 2 clutches, and now the transmissions done.

So I went to install the pilot bearing today and it wasn't going in very easy but I got it in. I made sure the pilot bearing would slide on and off of the transmissions input shaft before I installed it.

Then I went to push the clutch alignment tool in to check it out and the clutch alignment tool wouldn't go in, the pilot bearing whole was too small.

I then chiseled it out into pieces and went to nissan to get a new one, and measured the diameter of the outside of the pilot bearing and its at .812.

Then I went and measured the inside of where its supposed to go and its at .752.


What's going on here? And what could I do? I have access to a lathe that I could trim it down some, but I'd rather know why its like this.

[LoserCard]

Uh... well it slides on to the transmission input shaft so just trim the clutch alignment tool because that is the only thing not fitting right?

[S13Ryan]

No it will slide on the alignment tool too, But thats before I put it into the back of the crank. Once I put it into the back of the crank it wont slide into it anymore.

[compactfean]

Was this an auto before? I got a motor from a wrecking yard for my 200sx that was an auto and it had a torque converter bushing pressed on to the very end of the crank. Once I removed it. My pilot bearing tapped right in. (fyi fwd sr20de and rwd sr20det cranks are the same )

[LoserCard]

What are you tapping it in with? Maybe the thing your pressing it in with is compressing the opening of the pilot bearing.