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Old 07-08-2012, 03:06 PM   #1
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Oil pump

Wat can keep locking up a oil pump? Cleaned pan and everything but have locked up two pumps, any ideas?
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Old 07-08-2012, 04:38 PM   #2
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Could have very small debris from something making its way through the screen and locking it up, or maybe the dizzy gear has some defects. Just first thoughts that pop into my head. Never know though until you expect it all really well.

---------- Post added at 03:38 PM ---------- Previous post was at 03:38 PM ----------

Inspect* not expect
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Old 07-08-2012, 07:19 PM   #3
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Yea first one it stripped the dizzy gear replaced it ,oil pump shaft, and oil pump Cleaned the pan out and everything put it back together and two days later locked up again. It's got me stumped
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Old 07-08-2012, 11:38 PM   #4
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Re: Oil pump

Quote:
Originally Posted by Maddhatter88 View Post
Wat can keep locking up a oil pump? Cleaned pan and everything but have locked up two pumps, any ideas?
Quote:
Originally Posted by Maddhatter88 View Post
Yea first one it stripped the dizzy gear replaced it ,oil pump shaft, and oil pump Cleaned the pan out and everything put it back together and two days later locked up again. It's got me stumped
You have some debris in the system from somewhere.
Make sure you have the correct clearance from the pan to the pump suction screen too.
There is an article in the Useful Info thread on how to properly prepare and install an oil pump.

Also put a magnet on the bottom of the pan to trap and hold any metallic particles.
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Old 07-09-2012, 09:04 AM   #5
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Quote:
Originally Posted by Trojan Horse

You have some debris in the system from somewhere.
Make sure you have the correct clearance from the pan to the pump suction screen too.
There is an article in the Useful Info thread on how to properly prepare and install an oil pump.

Also put a magnet on the bottom of the pan to trap and hold any metallic particles.
Totally agree with ^

Also good idea to buy a good pump. No AutoZone/eBay specials.
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Old 07-09-2012, 09:36 AM   #6
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Quote:
Originally Posted by Trojan Horse

You have some debris in the system from somewhere.
Make sure you have the correct clearance from the pan to the pump suction screen too.
There is an article in the Useful Info thread on how to properly prepare and install an oil pump.

Also put a magnet on the bottom of the pan to trap and hold any metallic particles.
I cleaned the pan out of all trash abs the first pump was a reman. But the second one was a new pump
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Old 07-09-2012, 09:39 AM   #7
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Re: Oil pump

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I cleaned the pan out of all trash abs the first pump was a reman. But the second one was a new pump
There was probably some left in the oil passages.
Read the article in the Useful Info thread on how to set up the oil pump.
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Old 07-14-2012, 03:55 PM   #8
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Quote:
Originally Posted by Trojan Horse

There was probably some left in the oil passages.
Read the article in the Useful Info thread on how to set up the oil pump.
Ok pulled pan and all cleaned it out real good. Put new pump in. Cranked right up ran great. Ran it up the road and then got on it one good time and let off throttle (without clutch) and it snapped yet again? Any ideas please need help
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Old 07-14-2012, 04:04 PM   #9
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is it possible you have an aftermaket block? maybe the pump isnt aligned properly?
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Old 07-14-2012, 04:09 PM   #10
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No it's a 305 block. Stock. The bolts line up and everything lines up
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Old 07-14-2012, 05:03 PM   #11
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Re: Oil pump

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Ok pulled pan and all cleaned it out real good. Put new pump in. Cranked right up ran great. Ran it up the road and then got on it one good time and let off throttle (without clutch) and it snapped yet again? Any ideas please need help
Pull the pump apart and look inside it to see if there is any damage or debris.
Also check to see if the drive shaft is pushing the gears down into the bottom plate.


What weight oil are you using?
What pump drive shafts are you using?
Distributor and cam gears ok?
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Old 07-14-2012, 05:05 PM   #12
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Quote:
Originally Posted by Trojan Horse

Pull the pump apart and look inside it to see if there is any damage or debris.
Also check to see if the drive shaft is pushing the gears down into the bottom plate.

What weight oil are you using?
What pump drive shafts are you using?
Distributor and cam gears ok?
5 30 and just a stock oil pump shaft. And we took the OP apart and as far as I could tell it was good
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Old 07-14-2012, 05:08 PM   #13
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Re: Oil pump

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5 30 and just a stock oil pump shaft. And we took the OP apart and as far as I could tell it was good
Did it turn freely?
If so then the shaft must be binding up for some reason.
Do you have the correct distributor in it?
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Old 07-14-2012, 05:14 PM   #14
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Yea we put a new pump on it and I think they swapped the motor out to a carb intake. But they kept the EFI dizzy The harnesss is still in it but the dizzy is the only thing plugged in and without it hooked up I won run.... It's got my brother and me confused as hell
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Old 07-14-2012, 05:19 PM   #15
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Quote:
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Yea we put a new pump on it and I think they swapped the motor out to a carb intake. But they kept the EFI dizzy The harnesss is still in it but the dizzy is the only thing plugged in and without it hooked up I won run.... It's got my brother and me confused as hell
it shouldnt matter what intake. because the hold down is on the block.

but i would recommend getting a new mechanical advance distributor. i just recently went through this. the reason it wont run without the tfi harness plugged in, is because that harness tells the ecu to kick the fuel pump on. i can help you around all that if you decide to change the distributor. with then stock distributor your missing out on some good power because the computer is no longer telling it when to advance. thats why you need a mechanical advance.
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Old 07-14-2012, 05:19 PM   #16
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Re: Oil pump

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Originally Posted by Maddhatter88 View Post
Yea we put a new pump on it and I think they swapped the motor out to a carb intake. But they kept the EFI dizzy The harnesss is still in it but the dizzy is the only thing plugged in and without it hooked up I won run.... It's got my brother and me confused as hell


Look in the Useful Info thread and find the link on how to properly prepare an oil pump for use.
There may be something in there that will help you.
I would also use an aftermarket oil pump drive shaft.
The factory ones are notorious for failing.
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Old 07-14-2012, 05:31 PM   #17
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Quote:
Originally Posted by Trojan Horse

Look in the Useful Info thread and find the link on how to properly prepare an oil pump for use.
There may be something in there that will help you.
I would also use an aftermarket oil pump drive shaft.
The factory ones are notorious for failing.
Gotcha

---------- Post added at 05:31 PM ---------- Previous post was at 05:30 PM ----------

Quote:
Originally Posted by dreamstang

it shouldnt matter what intake. because the hold down is on the block.

but i would recommend getting a new mechanical advance distributor. i just recently went through this. the reason it wont run without the tfi harness plugged in, is because that harness tells the ecu to kick the fuel pump on. i can help you around all that if you decide to change the distributor. with then stock distributor your missing out on some good power because the computer is no longer telling it when to advance. thats why you need a mechanical advance.
How do u get around all that
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Old 07-14-2012, 05:45 PM   #18
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well the tfi module on the dizzy sends the signal to the ecu when to kick the pump on. the ecu then sends the signal to the fuel pump relay. its been a little bit, but im pretty sure the signal wire is tan/light green. if you take that wire and put it right to ground, the pump will turn on when the keys forward. now the only downfall is your pump will run whenever the key is forward. so what i did was install kill switch on that same exact wire. so if i need to do something with the key forward i can kill the pump. it also doubles as a theft deterent. really simple fix. i think it took me about 30-45 minutes for the whole job.
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Old 07-14-2012, 05:50 PM   #19
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But when the dizzy IS Unplugged the car will not run at all
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Old 07-14-2012, 05:54 PM   #20
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But when the dizzy IS Unplugged the car will not run at all
because the plug is not telling the ecu to kick the fuel pump on.

im betting when you unplug it the fuel pump doesnt run right?

if you take the tan/light green wire on the relay an ground it, it will start.

---------- Post added at 05:54 PM ---------- Previous post was at 05:53 PM ----------

but the pump still may do the 2 second prime i think. just not run continuous
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Old 07-14-2012, 05:57 PM   #21
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Well my brother just keeps saying he is just gonna put another pump in it and get a hardened oil pump shaft and see what happens lol I'm just like ok w.e lol
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Old 07-14-2012, 06:12 PM   #22
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thats what alot of people usually do is just change the pump and wire up there own relay. but i like to do stuff certain ways. and retaing everything in its factory location like lines,wires relay etc etc seemed best to me.

i figured this out when i went to install an msd distributor that didnt have a module on it. i did some research and talked to summit tech support a little and bam easy fix.

there maybe some more info in my "what it takes" thread. but you may have a hell of a time finding it in there.

---------- Post added at 06:12 PM ---------- Previous post was at 06:09 PM ----------

if you wanna test this out before you do it. just get a piece of wire with a alligator clip on one end, and ground the other end. you can use the seat bolt for ground, then squeeze the alligator clip into the tan and green wire of the fuel pump relay under the driver side. do this with the dizzy unplugged and key forward.as soon as you get contact through the insulation with the alligator clip the pump should kick on.
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Old 07-14-2012, 06:21 PM   #23
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Gotcha. I'll see what he is gonna do and go from there. Thanks guys
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Old 07-14-2012, 06:22 PM   #24
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Your welcome. Even though we strayed a bit away from the oil pump part. Lol
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Old 07-14-2012, 06:33 PM   #25
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Yea. I think something ain't right internally and it's not spinning like it should when he lets off of it and it's putting the pump in a bind and snapping the shafts. It twists the OP shafts like a twisler and breaking them off at the dizZy shaft. First time ive ever herd of this happening. I've had a lot of motor issues but nvr OP
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Old 07-14-2012, 06:42 PM   #26
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Are you sure its going into the dizzy all the way? Most of the time when you drop the dizzy onto the shaft it won't go all the way on. I like to turn the motor over by hand to get it to fall on. This is just when I put the dizzy on the shaft. I havnet changed a pump yet.
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Old 07-14-2012, 06:50 PM   #27
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Yea it sits flush on the block it fav me a lil bit of a fight at first but I jiggled the shaft some and it fell into place.
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