Early Hemi (51) Oil pump drive
Moderator: scottm
Early Hemi (51) Oil pump drive
Just when I thought I knew most everything about the early hemis, I'm out there about to pre-oil this old lump before trying to start her up after a lot of years of sitting idle (40 years), and I go to pull the intermediate shaft that drives the distributor. No problem. So, I am about to go into the oil pump with my handy hex head 'spinner' and whoa!, different drive dog. And I thought all these small-block originals kept pretty much all the internals the same. Well, there is the big 'slot' on the top of the pump shaft. I am planning on a new pump at some point and need to know if the newer style pump will bolt on the block or if some sort of adaptor is available? I got a piece of half-inch rod, and will make the 'female' slot to get the job done, but that was a surprise. Just thought I'd share this with the group. Ron
-
- Posts: 163
- Joined: Sat Jan 30, 2010 7:40 pm
- Location: Fort Collins, Colorado
Re: Early Hemi (51) Oil pump drive
You will find that the oil pump drive shaft is just a tad under 1/2". It's 0.486" to be a little closer. It needs to be that size to fit inside the bronze guide bushing.
Horsepower determines how fast you hit the wall. Torque determines the size of the hole you make. Holzwarth's Law
Re: Early Hemi (51) Oil pump drive
there's nothing wrong with the OEM pump, get a rebuilt kit if it needs it. There are adaptor kits for LA pumps, but there are problems with some of them. The LA HV pump only gives a skight increase in flow.jagster wrote:Just when I thought I knew most everything about the early hemis, I'm out there about to pre-oil this old lump before trying to start her up after a lot of years of sitting idle (40 years), and I go to pull the intermediate shaft that drives the distributor. No problem. So, I am about to go into the oil pump with my handy hex head 'spinner' and whoa!, different drive dog. And I thought all these small-block originals kept pretty much all the internals the same. Well, there is the big 'slot' on the top of the pump shaft. I am planning on a new pump at some point and need to know if the newer style pump will bolt on the block or if some sort of adaptor is available? I got a piece of half-inch rod, and will make the 'female' slot to get the job done, but that was a surprise. Just thought I'd share this with the group. Ron