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Author Topic:   OIL PUMP BOLT
STREET16
Dirt Full Roller

Total posts: 32
posted March 02, 2003 07:28 AM
Need help settling a dispute. My dad used a generic bolt to hold the oil pump on - the block didn't have one when we got it. Now we have oil pressure problems. 60 psi cold, and drops to 20 psi as it gets hot. Question: Will using a generic bolt cause such a problem?

fastrack1
Dirt Full Roller

Total posts: 73
posted March 02, 2003 07:47 AM
OK LET ME STATE THAT CHEVY SB DOES HAVE 2 DIFFERENT LENGTH OIL PUMP BOLTS NOMALLY U GET A PAPER STATING IN THE BOX WITH THE PUMP I BELIVE ITS POSSIBLE U USED IS TOO LONG OF A BOLT AND IT DIDNT TIGHGTEN DOWN HARD AND IS SEAPING WHERE THE PUMP MEETS THE BRG CAP ALSO THE OTHER BAD NEWS IS IF THIS DID HAPPEN U BOTTOMED OUT ON THE CRANK WHICH U PROBABLY HAVE DAMAGED DID U TURN THE MOTOR AFTER U INSTALLED THE PUMP OR DOES IT SOUND TIGHT WHEN TRYING TO CRANK

STREET16
Dirt Full Roller

Total posts: 32
posted March 02, 2003 07:49 AM
Bolt is the right length, but it is not an oil pump bolt.

teamstertom
Dirt Forum Racer

Total posts: 89
posted March 02, 2003 09:33 AM
My buddy had the same problem,so we pulled the motor,removed the pan and pump. He also used a regular bolt with threads thru out the bolt. After removing the bolt,which he said he torqued per specs(oil pump bolt 60-70 ft lbs)we saw the threads pulled on the bolt. The cap looked fine,but we got a oil bolt stud kit for about $7.00 and the good loc tite,replaced the pump to a Melling Hi volume......the problem was gone. Not saying this is your problem,but this is what we had to do. We replaced the pump for our own reasons...just cheap insurance.

sideways
Dirt Freak

Total posts: 273
posted March 02, 2003 09:43 AM
More questions.Did you reuse an old pick up tube?Was the pump new like the man said cheap insurance.I use a regular bolt grade eight.The stock bolt was to short.So I mesured the depth and the bolt shaft and used on 1 1/2 threads from bottoming out.How far is the pick up off the floor of the pan?just a few things to look at.

teamstertom
Dirt Forum Racer

Total posts: 89
posted March 02, 2003 09:55 AM
I have another little story....another racer I know took apart his oil pump and rebuilt it by pulling the gears and reinstalling them again upside down,put it back together. Well when he went to prime the motor he broke a ear off of the oil pump shaft...there was a wear pattern in the top cover of the pump and whjen he put it back together,it bound tight.
The oil pump is the heart of your motor,it has to get that oil to all of the important places....don't mess around. Buy a good pump,bolt,pan and pick up. I have heard stories on thedirtforum about rcers and those cheap claimer pans with poor workmanship and flaws. Make sure you have the right pick up tube and it's properly.
Did you get the tube in all the way,did it come loose? If you have any doubt in your mind,I know what i would be doing. I know it may not be a fun chore,but rebuilding a new motor right away in the new season would bite too.

STREET16
Dirt Full Roller

Total posts: 32
posted March 02, 2003 10:23 AM
It's a brand new hv oil pump. New claimer pan with pick-up tube. I have another hv oil pump to put in it. I'm in a dispute about whether or not to get a new bolt (or stud) for the oil pump. My Dad doesn't think it could be the problem, and will fight to the death (of my motor) to keep using the bolt he found in a coffee can somewhere. I would rather replace it with the proper bolt. But I would like to know if the bolt itself would cause the problem, before I make a major issue of it.

teamstertom
Dirt Forum Racer

Total posts: 89
posted March 02, 2003 10:36 AM
Are you sure the gauge is okay? Double check the easy things. Is the oil okay? Smell and look okay? Oil filter not crushed or damaged? Check and recheck....just like race day.

sdhnc29
Dirt Freak

Total posts: 467
posted March 02, 2003 12:26 PM
The bolt type will not cause your problem , and has nothing to do with oil pressure . I would check your new claimer pan , and see if the trap door's are installed correctly . I have seen several of these pan's with the trap door's installed wrong from the pan manufacturer . In other words , the door's don't allow oil to return to the pump pick up .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780

STREET16
Dirt Full Roller

Total posts: 32
posted March 02, 2003 05:31 PM
Swapped pump and bolt - no change. pulled motor apart - rear cam bearing improperly installed. Wishful thinking about the bolt. With my luck, it's never anything quick and easy. Not going to complain though, atleast it wasn't anything terminal - or exspensive. Thanks to all, MAC.

teamstertom
Dirt Forum Racer

Total posts: 89
posted March 02, 2003 05:52 PM
When it comes to racing,anything can and will happen. We all have learned very many costly mistakes could have been resolved with a stroke of common sense.

You must feel alot better about finding a problem,than not locating it at all.

One thing about Dad,Dad is never wrong....well just let him know that he's never wrong.....even when he is.

Pickel
Dirt Forum Champ
Total posts: 564
posted March 02, 2003 08:37 PM UIN: 25419780
My cousin had this same problem when he built his motor years ago. He told the oil pump apart and it looked fine so he put it all back together and tried it again. Pulled the motor completely down and everything looked good. Then he put another oil pump in it and that took care of the problem. It was just the oil pump breaking down.

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