Oil Pump Questions/Confusion
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
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From: Ontario
Oil Pump Questions/Confusion
I picked up a new oil pump today, shown below. It is a GM-discontinued part so I went with a Federal-Mogul unit. I believe that that corporation has a pretty solid reputation.
Q1. The link included below contains installation instructions. They speak of "new" and "old" main bearing caps. And 7/16-14 x 2-3/16" and 7/16-14 x 2" mount bolts, respectively. For some reason I concluded that 1979 is old so I bought the #3754998 (2-3/16) bolt from a GM dealer. Just so all pieces would be fresh. After thinking things through, my conclusion may be an erroneous assumption. So the question is: if during disassembly I find a "new" bearing cap, can the 2" bolt be re-used? Or should I order a new one? The pizza and beer fest is next Saturday so there is adequate time to get one.
Q2. Is the pick-up screen shaft simply a press fit into the pump? I cannot see any other way of fastening it....BTW, the holes in the metal mesh are very fine. Kind of brings home the need for clean, sludge-free oil.
http://temp.corvetteforum.net/c3/pau...mpinfo_002.jpg
[Modified by paul79, 2:49 PM 7/20/2002]
Q1. The link included below contains installation instructions. They speak of "new" and "old" main bearing caps. And 7/16-14 x 2-3/16" and 7/16-14 x 2" mount bolts, respectively. For some reason I concluded that 1979 is old so I bought the #3754998 (2-3/16) bolt from a GM dealer. Just so all pieces would be fresh. After thinking things through, my conclusion may be an erroneous assumption. So the question is: if during disassembly I find a "new" bearing cap, can the 2" bolt be re-used? Or should I order a new one? The pizza and beer fest is next Saturday so there is adequate time to get one.
Q2. Is the pick-up screen shaft simply a press fit into the pump? I cannot see any other way of fastening it....BTW, the holes in the metal mesh are very fine. Kind of brings home the need for clean, sludge-free oil.
http://temp.corvetteforum.net/c3/pau...mpinfo_002.jpg
[Modified by paul79, 2:49 PM 7/20/2002]
Safety Car
Joined: Aug 2001
Posts: 3,686
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From: Waterford Mi
Re: Oil Pump Questions/Confusion (paul79)
1.)I don't see why you couldn't use the old screw because it is not under a load like a bearing and most people rebuild motors without replacing them.
2.) Yes it is just a press fit but I know most people tac weld it in anyway.
3.) I wish I could join you for the pizza and beer.
2.) Yes it is just a press fit but I know most people tac weld it in anyway.
3.) I wish I could join you for the pizza and beer.
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
Re: Oil Pump Questions/Confusion (redwingvette)
Thanks for the reply. I will knock it in with a rubber hammer. And yes, I anticipated that the old bolt could be used again. Does not move and is well lubricated! I guess I am **** on repairs....
Melting Slicks
Joined: Oct 2001
Posts: 2,065
Likes: 1,395
From: Halifax, Nova Scotia, Canada
Re: Oil Pump Questions/Confusion (paul79)
I will knock it in with a rubber hammer.
The pick-up screen is a very snug fit. It is greater than a rubber hammer.
I think there is a "tool" to aid pounding it in place.
It also needs to be positioned correctly before pounding/pressing in place.
(Pick-up to oil pan clearance)
Many people also spot weld the pick-up to the pump after it has been pressed in place.
They have been known to fall off.
I hope I have not complicated your new pump installation. Just a few things that I was not sure you were aware.
Barry
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Re: Oil Pump Questions/Confusion (paul79)
WELD IT IN!!!!!!!!
My pickup FELL OFF and hit my crank and nicked a piston
i don't know how many miles ago! :eek: :eek: :eek:
I am in the process of a rebuild, and when i took the pan off, the pickup was in the pan and pretty messed up from hitting the crank :eek: :eek:
It took a little metal out of the crank, and nicked one piston skirt,
so please tack weld it on, they can come off. :cheers:
details and pictures of rebuild along with guide will ge comming soon...
:reddevil
[Modified by VETDRMS, 2:55 AM 7/21/2002]
My pickup FELL OFF and hit my crank and nicked a piston
i don't know how many miles ago! :eek: :eek: :eek:
I am in the process of a rebuild, and when i took the pan off, the pickup was in the pan and pretty messed up from hitting the crank :eek: :eek:
It took a little metal out of the crank, and nicked one piston skirt,
so please tack weld it on, they can come off. :cheers:
details and pictures of rebuild along with guide will ge comming soon...
:reddevil
[Modified by VETDRMS, 2:55 AM 7/21/2002]
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
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From: Ontario
Re: Oil Pump Questions/Confusion (VETDRMS)
Barry and Vetdrms. Very useful information! I don't have the special tool but I am sure one of my friends who is a mechanical genius has something similar. The torch may be a problem but I certainly prefer to have the oil pick-up screen spot welded. There will be three or four of us doing the job so once we have the pick-up properly positioned, one person can drop by a local garage to have the work done. Appreciate your help!
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Melting Slicks
Joined: Oct 2001
Posts: 2,065
Likes: 1,395
From: Halifax, Nova Scotia, Canada
Re: Oil Pump Questions/Confusion (paul79)
The torch may be a problem but I certainly prefer to have the oil pick-up screen spot welded.
Be careful about excessive heat if welding.
You may want to remove the bypass spring before welding. Excessive heat will ruin the spring.
A torch would be a no-no. A quick spot with the "electric" works great.
Good luck.
Barry
