Oil Slinger (aka "Oil Retaining Washer" by Willys):
While not 100% conclusive, I am
convinced that the oil slinger WAS used on all CJ2A transmissions, for
a) The original
below did not depict an oil slinger, so I
questioned its use. I then found another illustration, from
the same '45 Maintenence Manual, which DOES show the slinger.
The clutch assembly cross-section:
I am assuming that the illustrations
in Figs. 1 & 2
are in error.
transmission DID have this slinger (very early '46 CJ2A S/N 16279)
Nobody responding to my requests had ever seen a transmission without
Main Shaft Oil Seal:
a) It WAS used on transmissions
The answer is in the manuals, but it's
intuitive or well documented. More sleuthing uncovered these
passages (quoted from Willys manuals):
Service manual says: "Effective with Model CJ2A S/N 24196 and all other
models listed, oil circulation is provided between the transmission and
transfer case by the addition of drilled passages between the two
units." And it goes on to detail the changes. With
circulation, there was no further need for a seal, and it was
The Parts Manual lists: 3
different transmission "assemblies" for column shifts:
- 640122 used
up to S/N 24196
- 641730 used from S/N 24196 up to
- 644317 used after S/N 38221
comment after the 640122 assembly says to "use 1 each, A-15428"
is an "oil seal, transmission main shaft, up to S/N 24196".
It just isn't shown in any parts manual illustration.
from the '45 manual: "Place the oil seal, no. 27, in position in the
main shaft bearing adapter or plate, no. 28, with oil seal lip
facing forward. Install the bearing adapter and seal assembly
over the end of the main shaft and in the case"
b) My transmission DID
I could not remember if it had one or not,
as it has been 6+ years since I disassembled the transmission.
But after inspecting my rear bearing spacer, it was clear
that it did have one. The wear patterns from the original
felt seal are quite evident in these photos:
have found a modern replacement seal: Chicago Rawhide # 17310 (or Nation Seal # 43071s)
Photos show the seal w/the spacer in place.
(Bearing Retainer) Gasket:
The full coverage front
gasket is a carry-over from WW-II military vehicles. As with
other parts, Willys had excess inventory at wars end, and used these
parts on CJs until they were depleted, when they changed to the
retainer only circular gasket. Either type can be used.
got this info from old-timer,
who's been in the Jeep business for 30+ years, mostly as a motor pool
mechanic in the Air Force. Apparently there was (and still is
some) a requirement that military vehicles have a water-tight
seal between transmission and bellhousing. They wanted to
as much water out of the bellhousing as possible. This
doesn't make much sense, since there are still far larger openings in
the bellhousing for water to get in, but it's the only explaination
I've got so far..
in position of the input shaft WRT the clutch disk is inconsequential,
and Willys subsequently eliminated the full flange gasket on CJs.