Per request, same procedure applies to all M45, M62, M90, and M112 Eatons:
1. Get these parts. Letter drill "R", 1/8NPT tap, 1/8" brass pipe nipple (threaded
both ends), 1/8" NPT coupler, 1/8NPT grease (zerk) fitting
2. Locate these two holes on the bottom of the Supercharger. Their original
purpose was to preven compression when the original needle bearings were
inserted, to prevent air behind them from compressing and ejecting them:
3. CAREFULLY drill out the hole with the Letter R drill. If you don't have an R, go
to a 11/32" drill (0.343
, slightly larger. Do NOT hit the bearing. Drill straight.
If you mar or gall the bearing, it will leave a groove in the bearing pocket of the
SC as it comes out.
4. Carefully tap 1/8" NPT threads into each hole. Use oil. Get them as deep
as you can without hitting the bearing.
5. Results of tapping:
6. After assembling the brass parts and zerk, carefully insert and thread it in
without cross-threading. Get it snug. Use a helper and put a good-quality
grease gun on the fitting:
7. Pump away until the bearing comes out. Sometimes they come out with
significant velocity. If your helper is your significant other, and you're horny,
lay a rag inside the SC to 'catch' the bearing. If your helper is anyone else,
aim it in their general direction, and you might get a good show. Of the 4 I've
done, only one came with velocity. The term for the aftermath is 'Gicky'. You
can see the first bearing starting to come out. This one DID have velocity, and
Linda, my trusty helper, got 'Gicky'.
8. The mess you have to clean out (all of it, use solvent) so you don't have a
pre-lubed bearing that wants to move around later:
9. Ready to press new bearings. Press them just below flush (to the same
depth as the original bearing depth):
10. You can get the bearings from www.rollingperformance.com
pre-greased (this is for a pair). A mighty good deal, considering they typically
ship 2-day express mail for an additional $5.95. Great peace of mind for the
price, and you don't have to buy the expensive grease seperately
I will move these pics to my server sometime soon, then link this post in a
Techinfo article so your grandchildren can learn how to do this.