When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Ok, so I've been trying to seat this piston in the forward drum off and on for a few days now. It's just not working out. So, my question is...is the inner seal necessary? I ask for a couple of reasons, one is..I know that the one on the direct drum isn't needed, as it only means a harsher engagement. Just wondering if the same is true for the forward drum. I'm sick of fighting it. Btw, I've tried the rubber band freezer method....lube...all of it.
I agree, I have never had a problem installing one. Leaving out the inner seal will make for a harsh forward engagement. The lip goes upward as stated.
You are using an aluminum piston right? Inner seal lip side up? And this may very well be the problem. I installed the seal lip down like the inner and outer on the piston.
I've never had a problem with the inner seal. Did you match up the number on it with the old one? And here's another mistake I've made, searched the garage, but can't find it. I think me having it upside down might be the issue.
Try installing the piston with only one seal at a time, maybe it's not the inner giving you a problem?
Originally Posted by PBA
I agree, I have never had a problem installing one. Leaving out the inner seal will make for a harsh forward engagement. The lip goes upward as stated.
Thanks, will be trying it installed the right way when I get home tomorrow.
12-26-2016, 01:34 PM
Th400 forward drum inner seal 
