Source
r/AskAMechanic•
KniKnight

Civic transmission input shaft play

Hello,

I just bought an automatic transmission from a junkyard, and after working on it for a bit I've noticed the input shaft has a very slight movement up, down, left, and right and makes a tapping noise when it touches. I've read that this is normal and should become sturdier once it's mated to the pilot bearing, and I've read that any play whatsoever indicates a bad input shaft bearing. What is the truth of the matter?

Posted Feb 25, 2023, 2:25 AM UTC · edited

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1
Dasalottacheese•

Generally the torque converter nose and the oil pump centralise everything. usually you can move the torque converter up and down a little once it's installed indicating a small amount of play in the input shaft.

MAKE SURE you line up your oil pump... youtube vids will help you there.

1
KniKnightOP•

Thank you for the reply. I've been doing some reading about the oil pump alignment, and I realized I may have done things incorrectly the first time. I didn't realize the torque converter needs to be installed onto the transmission before being mated to the engine. I left the torque converter on the engine and installed the original transmission that way, and it may have caused the issue I ran into where I was unable to turn the engine over with a ratchet with the transmission attached. Is that a symptom of a misaligned oil pump, and not a seized transmission as I suspected?

1
Dasalottacheese•

more likely a crushed oil pump within the transmission from the torque converter not lining up onto the transmission oil pump, sorry to say mate, but you did that.

1
KniKnightOP•

Damn, that sucks. At least I've got a second one to work with, and knowledge not to screw it up. Appreciate the info!

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