after market oil pumps


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By Moz - 17 Years Ago
g'day guys

i just changed the after market oil pump on my 272 back to its original oil pump & discovered something i never thought of. if fitting a non genuine oil pump measure the depth of the female hex as it may be deeper than original mine was 1/8" deeper than original which caused the oil pump drive shaft to not be fully located in the dizzy & stripping the female hex in the dizzy which of course meant  no oil pressure which nearly cost me an engine.

By mctim64 - 17 Years Ago
I had the same thing happen on a 430 Lincoln that I built for a boat, although this was a high volume pump, fortunatly the guy installing the engine knew to shut the engine down when he saw no oil pressure and fixed the problem with a fabed drive of his own making. Engine is running fine now.
By 2DRHRDTP57 - 17 Years Ago
Moz (11/1/2008)
g'day guys

i just changed the after market oil pump on my 272 back to its original oil pump & discovered something i never thought of. if fitting a non genuine oil pump measure the depth of the female hex as it may be deeper than original mine was 1/8" deeper than original which caused the oil pump drive shaft to not be fully located in the dizzy & stripping the female hex in the dizzy which of course meant  no oil pressure which nearly cost me an engine.

 

Good info Moz, what were the two measurements so we can do a comparison?

By Moz - 17 Years Ago
dutchy i havent measured the depth of the after market pump but the factory pump female hex is 1/4" deep female hex in the dizzy is same depth ted said in an earlier post that that is adequate for a y. i will measure the after market one at work tomorrow.
By Moz - 17 Years Ago
ok measurements are factory pump female hex 3/8" deep

aftermarket female hex 5/8" deep

my 1/4" measurement was taken from the wear marks on my old pump drive shaft

2/8" of the dizzy female hex is stripped, dizzy female hex is also 3/8" deep

sorry for confusion this is the first time ive had them all on the bench together to measure them