yorab
Ensign
- Joined
- Jul 6, 2002
- Messages
- 960
motor in signature. I purchased my gearcase head assembly (aka prop shaft bearing carrier) as New Old Stock. It included the head, the bearing and the seal. I put it on the gearcase and tested it at 11psi. Unfortunately I had some leaking around the OD of the seal. I called the place where I got it from but they didn't have another. However, they did have the seal so I told them to send it to me and I would remove the old seal and press in a new one.
I removed the old seal with a pin punch and hammer from the backside. I then coated the bore of the head with Scotchgard 847 and I prepared to press in the new seal with a press that I have access to at work.
I placed the seal into position and pressed it in by hand just to get a slight start on it as I always do. However, when I pushed it in with my thumbs, I realized that I could push it in quite a bit. With a bit of effort, I was able to press it in until it was flush with the head-just as the factory manual says to do. I figured that there was no way that this would seal properly so I pressed it in just a bit more with the machine. So, either the seal is not large enough or the bore is not small enough. Probably the bore.
I tested this out at 11psi and no leaks! I lost 3psi over one hour somewhere, but I didn't see any leaks with the soapy water test. Could it be that 847 is some kind of miracle sealer?
I removed the old seal with a pin punch and hammer from the backside. I then coated the bore of the head with Scotchgard 847 and I prepared to press in the new seal with a press that I have access to at work.
I placed the seal into position and pressed it in by hand just to get a slight start on it as I always do. However, when I pushed it in with my thumbs, I realized that I could push it in quite a bit. With a bit of effort, I was able to press it in until it was flush with the head-just as the factory manual says to do. I figured that there was no way that this would seal properly so I pressed it in just a bit more with the machine. So, either the seal is not large enough or the bore is not small enough. Probably the bore.
I tested this out at 11psi and no leaks! I lost 3psi over one hour somewhere, but I didn't see any leaks with the soapy water test. Could it be that 847 is some kind of miracle sealer?
