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nosman 07-17-2008 11:44 AM

siezed oil pump
Iam having oil pump problems I have siezed two HV meiling pumps motor is new built 351 windsor alum heads fox body oil pan all MSD setup frist pump took the oil pump shaft this one took the gear off the distributor has 50-60 psi thru out rpm range any help would be great. Thanks :mad: :mad:

gregb 07-17-2008 12:03 PM

The only reason for them to seize would be that they got dirt or something metal in them. Are you running one of those HD oil pump shafts or the stock Ford shaft? When you say took the gear off did it shred or break the roll pin? Any debris in the pan or filter? If it just broke the roll pin and the gear came off you should have replaced that pin after the first failure. DOes the oil pump turn at all when it's out of the engine?

nosman 07-17-2008 12:23 PM

siezed oil pump
The frist time it went I had the whole motor gone thru again. with the pump being out it only turns 9 oclock to 3 oclock then back. And did not take the pin out this time it took the teeth from the gear of dis. It does have a HD shaft. Parts of the gear is in the pan.

gregb 07-17-2008 12:35 PM

Take the pump apart, you should be able to see what is causing it to lock up. The gear pieces are probably in the pump on the current one. What kind of cam are you using, roller or flat tappet? Many roller cams require a special gear on the distributor. If everything checks out you have some dirt or debris somewhere. Any metal in the pan besides the gear? What was found in the pan the first time, maybe they didn't clean it well enough before it went back together.

nosman 07-17-2008 12:53 PM

siezed oil pump
Ok thanks for the Info. I will take apart the pump an check it. Could be they did not get the dirt out last time.

nosman 07-17-2008 12:56 PM

siezed oil pump
Iam using a flat tappet cam Comp Cam with a Ford motorsport chain & gear

61bone 07-17-2008 04:05 PM

That pump should turn fairly easily. Do you have a intake screen on it? Just asking- If it only turns part way, it has something in it or has a scored housing. Either way, it time to rethink using that pump.

bates_k 07-17-2008 04:48 PM

Read this...

And become enlightened...


woodz428 07-17-2008 05:15 PM

Since they live in oil, it's unusual for one to "lock-up". As others have pointed out you have ingested something. I recently pulled a pan off an early Bronco that had that happen...twisted the drive hex like a piece of licorice. he had just had a new pump installed a few months earlier by another shop and when we removed it it was jammed solid. I pulled it down and discovered that the original pump installer had been careless when scraping the old gasket( between the pick-tube and pump) and had lost a small piece of the gasket into pick-up tube( most likely). After a few months operation it had finally been drawn into the pump and was smashed between the rotor and it's outer impeller. After knocking the pump apart and removing the minute gasket piece the pump rotates freely. I won't use the pump, but always like to understand what generates a failure. They are very tight tolerance and it doesn't take much to lock them.

nosman 07-17-2008 06:46 PM

siezed oil pump
I just talked to a real motor builder and he said he ran into this problem before. And said the SVO pump shaft Iam using is to long He said they make 3 diff ones. if it does not have 1/4 to 3/8 up and down play in it when the pump and dis installed. It will sieze up a pump fast and mine had no play in it. I hope this will fix the problem. Thanks for everybody help.

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