1959 Oil Pump OEM Part number

[wisebri24]

I've searched for this part number forever. I want to replace the oil pump in my 1957 Special 364. I am reading I should replace it with a 1959 oil pump but cannot find the GM OEM part number. Just can't afford to buy the wrong one. Please advise.

 

[rcull]

From the '60 parts book, 1957-58, 1175268

 

[wisebri24]

Thanks for the response Bob. But I need the part number for a 1959 oil pump. Thx. Joe

 

[rcull]

woops...

1185507, 1959-61

 

[wisebri24]

woops...

1185507, 1959-60

Thank you! Now I just have to find one...
Joe

 

[wisebri24]

1957 oil pump

The pump out of my 57 is 1174262-6 so what is this part number? I just found a 59. So pleased. How do you tell the vacuum pump from one without (beside the number)?
thx.

 

[rcull]

I think you may be confused, there is no vacuum pump associated with the oil pump.

The vacuum pump is associated with the fuel pump. There is a '57 Chassis manual in the reference section that you can refer to.

 

[wisebri24]

57 oil pump

I found an old article on line. I thought was about the oil pump. Oops. It was in fact "fuel pumps" as they referenced what the article was about as "the pump" Duh. Thanks for the clarifying.
Joe

 

[TODD]

See the attached 2 pages from the 1957 Buick Product School Manual describing the new combined oil/vacuum pump used in '57 and 58. The part number for the pumps and screen is 1175268 as Bob notes above. The 1174262-6 number is a casting number of the oil pump body. Casting numbers very seldom match the part numbers. Buick didn't sell the pump body by itself, so there's no way to tell if this is the part number of the body.

With the the introduction of electric wipers in '59, the vacuum pump was discontinued. The pump bodies are similar for '57 and '59 but not the same. See the attached pages from the '57 shop manual (pg 2-40) and the '59 shop manual (pg 2-39).

 

[wisebri24]

1959 oil pump in a 1957 364 engine

Thank you for the responses Bob and Todd. Well I located a used 1959-60 oil pump. Apparently the 59 pumps more volume. Once I have the two in my hand I will see if they are interchangeable.
I am new to the world of Nailheads but always admired them from outside the wheel wells. I am rebuilding this engine as a winter project. I own a 1935 Chevy with the original drive train, brakes, and 6v system.
I live for these challenges and appreciate any guidance I can get. Thank you.

Image is my 35.

 

[wisebri24]

1957 to 1959 oil pump swap.

They are similar. Has anyone put a 59 oil pump in a 57? Russ Martin at Centerville makes the claim that 59 is better.

 

[rcull]

Having now been made aware that the 57/58 pump has a vacuum aspect to it, I would suggest that the only reason for using it is probably a restoration where you are going to be using the vacuum accessories, it will mostly effect the windshield wipers, but, they will work without the assistance of the pump ( from engine vacuum ). If it is going in anything other than a restored car, or if the wipers are going to be upgraded to electric, then I would follow Russ' advice and use the '59 pump.