The MD22L engine is based on a Perkins
block that VP used for many years, and was also sold by Perkins
as the M50,60,80, etc. It was also used in numerous on highway applications.
In the VP version thereís a 10mm thick plate which bolts to the back of the block, and the rear seal sits in this plate. The plate also is sealed to the block surface by a gasket
, and this gasket
could also be causing leaks
The process of replacing this seal is described very completely in the VP workshop manual (publication #7738684-5 April 1999) on page 47. This is actually a Perkins manual that was adopted by VP, and like most Perkins manuals
it is very complete. Maybe you can find it on line.
To replace the seal you will have to remove the transmission
, the flywheel housing, the damper plate, and the flywheel, and that will expose the seal. The manual describes the removal
and replacement process and the use of three special tools to do it. I would guess that a technician of moderate skills can do the job with normal shop tools and could get by without all these special bits and pieces...
In the VP version of the engine the rear motor
mounts are situated on the flywheel housing, so to replace the seal you will have to block up or otherwise support the rear of the engine as the flywheel housing will be removed.
The VP part numbers for the seal and gasket are 859718-9 and 861404-2 respectively, but of course they may have been superseded to different numbers over the years.
I am also sure you can find these same parts
from Perkins or other sources as well.