Oil Pressure problem

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Apr 21, 2006 | 11:17 PM

#16

F250OBX

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Joined: Jul 2005

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Speaking of a 289..... I had one in my '67 mustang, and it lost oil pressure, first at idle, then altogether. Turned out to be the pump drive stripped out where it engages into the bottom of the distributor. At first it would still turn at higher RPM. We thought it needed an oil pump, and found this in the middle of changing the pump. Changed the drive and it worked fine.

May 12, 2006 | 11:27 PM

#17

nascar88ford

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Joined: Aug 2005

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I feel SO stupid! It turns out it was the modified fan clutch we made. I found this out because we took the belt off and it was quiet as can be. ALTHOUGH, we did put an oil pressure guage on it and it has about 50psi when cold, but about 7psi when warm and in drive. I must have not looked hard enough to see the oil on the head. There is oil on the rocker arms. My dad said I should switch over to 5w-30 instead of 10w-30 and that would help the oil pressure issue. Maybe we have a few thousand more miles out of it but I know rebuild time is coming! I've heard of these 4.9's running a while on 5psi, just as long as there IS oil pressure. Does anyone think a higher output oil pump would buy me some time on a rebuild? Advance has one that claims to pump 40% more oil than the factory one. I could have sworn that the noise was coming form under the valve cover. Anyway, thanks for all the help and sorry for the delayed response.
-Matt

May 14, 2006 | 09:40 AM

#18

lv2race

Laughing Gas

Joined: Oct 2005

Posts: 1,226

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From: The OC

nascar88, on a side note, is your user name because you like the brown truck? Or is it because of Dale Jarrett? Dale will be racing a Toyota Camry for Michael Waltrip next season.

May 14, 2006 | 08:32 PM

#19

handyman43358

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Joined: Aug 2004

Posts: 2,908

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From: West Mansfield, Ohio

That irritates me to no end....

Nevertheless, what did your modified fan clutch have to do with anything? I guess I'm lost...

May 14, 2006 | 09:51 PM

#20

nascar88ford

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I CAN NOT BELIEVE JARRETT IS RACING A TOYOTA NEXT YEAR. I'm a huge Jarrett fan but I've got a plan. Sure I will buy a new Jarrett uniform jacket next year but I'm going to cover up the Toyota symbol and wear a Ford racing hat. I'm serious, I can't believe it. Once Jarrett retires I'm going to be an Edwards fan. Anyway, we drilled two holes in the fan clutch and put two bolts in it. Turns out that one of the bolts some how broke off and the other one was loose, causing it to rattle. I wonder if the airflow caused the sound to be farther back than where it was coming from. We did that because it seemed to run cooler when stopped in traffic. I put another fan clutch in it and all is well. Like I said, I feel stupid. It is getting to that area (oil pressure) for rebuild time, but maybe I have some years before that.
-Matt

May 14, 2006 | 09:59 PM

#21

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

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From: Brentwood,CA

Quote:

Originally Posted by andym

Almost all of the new UPS trucks are diesels now. There are not many, if any at all, gassers left.

UPS wanted a stout motor, one that lasted forever, got decent gas mileage (relatively speaking), didn't cost much to fix, had a lot of low-end torque for getting a load moving, and wasn't a diesel because of all the stop/start driving they do. So the 300 was a perfect fit.

From what I understand, they used them for years and years before they all went diesel.

Nascar88: what were the results of the oil pressure test?

oart of it was also uncle sam. UPS knew of the clean air act of the early 90's and were offered tax cuts if they could make 71% of their fleet meet clean air standards. they used the 4.9 engine and ran them off of compressed natural gas. you still see many to this day that say "clean air vehicle" . UPS was also the one who placed a giant order for NP 345 transmissions before NP was going to stop making them. My friend eric is head of service in the west sac facility and i was able to get a brand new NP 435 for 300.00. the need for them is down because most have been retrofitted with ZF trannies.