First time for everything, they say. I've never had to do this one before, and it has me stopped.

The new O-ring just seems too fat to compress in the space available. I know it's not, but don't know how much force to use, nor how to apply it.

I tried tapping it, using an 18mm socket which is a good fit on the top of the (plastic) housing. But that only got it partly in place — part of the O-ring (circumference) was still out, and looked like it would be sheared off if I continued. (Tapping had become pounding.)

Any suggestions, tips, or tricks would be much appreciated.

--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67