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Help please! Leaking input shaft seal after replacing seal.
So my parents have a 2006 honda civic base model with and auto transmission. The block ended up being cracked so we bought a replacement junk yard motor. Motor works great no issues however when we were installing it we pulled the torque converter out because it wouldn't seperate even though it was completely unbolted. So we replaced the input shaft seal and reinstalled. Almost immediately it started puking trans fluid on the the floor so now I have it all back apart and am looking for some guidance so it doesnt happen again. Does this seal need to be flush with the lip or fully seated to the bottom of the trans. Also what is the best part store seal I can get, local honda dealer is closed until monday.
Re: Help please! Leaking input shaft seal after replacing seal.
I’m sorry to hear about the leak, it sounds like a classic headache with the R18 auto trans. Here are a few things to check:
1. Seal Seating Depth The input shaft seal should generally be installed flush with the housing lip, not bottomed out. If you drive it in too far (all the way to the bottom), the sealing lip might not sit on the correct smooth surface of the torque converter hub, causing an immediate leak.
2. The "Three Clicks" Rule (Critical) The most common cause of leaks and pump failure is not seating the torque converter fully. It has to engage three levels: the input shaft splines, the stator splines, and finally the oil pump gear.
Pro-tip: Use a straight edge across the transmission bellhousing. The converter should be recessed deep enough. If it's too far forward when you bolt the trans to the block, you'll crush the pump or ruin the new seal instantly.
3. Inspect the Converter Hub surface Since you mentioned the converter was stuck during removal, check the hub (the "neck") for any burrs, scoring, or a groove worn in by the old seal. If you can feel a scratch with your fingernail, a new seal won't hold. You might need to lightly polish it with 1000+ grit sandpaper or check if the pump bushing is damaged."
Help please! Leaking input shaft seal after replacing seal.
