Re: IML: b and rb oil pump priming

["mike sutton" <mikanlin62@xxxxxxxxxx>]

The B and RB mopar engines use a separate drive shaft that is gear driven by 
the camshaft to run the oil pump and the distributor.  When you pull the 
distributor and look down the mounting hole you see the top of the 
intermediate shaft with the gear built into it and the cam gear it runs 
with.

The shaft is a hex at the bottom end,  3/8 hex i recall but i cant swear to 
it, and it meshes with the oil pump.  The top of the shaft has the tang that 
the distributor meshes with.  The gear that meshes with the cam is part of 
this shaft.

As far as priming one of these engines, you can take the time and energy to 
modify an old intermediate shaft and spin that with a drill, or you can just 
buy primer shafts thru tool dealers.  I have a four piece set that will 
prime any  mopar or even the lesser brands.

If you get one of these shafts, simply remove the distributor and 
intermediate gear, chuck the shaft into a reversible drill and mesh the 
shaft with the oil pump.  You need a reversible drill because big block 
mopars run the dist and oil pump counterclockwise.  Id recommend a half inch 
drill as well,  youd be surprised how much resistance it can take to pump 
that oil.

Personally, I like to crank the engine a bit with the plugs removed after 
ive gotten pressure from using the primer, that way you know without a doubt 
that every moving part was subjected to oil flow with the least amount of 
load on them.

Btw, when done, Mopar recommends indexing the intermediate shaft to the cam 
in such a way that the distributor drive slot runs fore and aft with the 
engine centerline. Sometimes it takes a bit of bumping the oil pump around 
with the priming shaft to get that position but its not difficult.   I 
recommend checking its orientation when  you remove the distributor  and 
making a notation of it  as well as doing the same with the distributor when 
you remove it or you may be searching the iml archives for the information 
on finding number one cylinder and how to time  your engine.   A few moments 
spent with a paint marker or a pencil and paper can save hours of 
frustration later.

Mikey
62 Crown Coupe 




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