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New Engine. . .Now I Got Oil Problems. . .Help!

4928 Views 27 Replies 11 Participants Last post by  Arisley
Ok, just got the engine built that's in my sig (yes, i did all the work w/exception to the machining myself). So I have 1 2 or 3 problems, i'm not sure how related they are, but here it goes.

1) I have an oil leak from the rear of the engine. No oil in the valley, no oil coming from the oil plugs in the back of the head. Most of the oil is coming from the inspection cover in the tranny. It is engine oil. It seems to leak after running the truck, but eventually stops after the truck has been shut down. I'm guessing i leak about and ounce or a little more every time. . .it leaves a spot about the size of a dinner plate over night. I checked the h2e mounting and on the front it looks good. . .the exhaust has always been too hot to check the rear, but i'm pretty sure it's not leaking. I'm to the point that i think its an oil plug in the back of the block or the rear main leaking. Not a big deal, i'll get it fixed when i go to Brians to have the tranny retuned for the new power.

2) At start up it takes about 6 seconds to build oil pressure on my guage (the factory idiot guage). With the old motor, it would build pressure nearly instantaneously so i know it should read pressure much quicker. I had a devil of a time trying to get oil pressure to initially start the motor. I ended up packing it w/vasoline to get it to draw pressure and the truck started on the 2nd crank. The entire rebuild kit was a ford issued kit that i purchased through BWD, the entire low pressure pump was replaced with a new one.

3) After i hit the 150mile mark i started having issues starting the truck after it would sit over night. The HPO resevoir is draining out. It can sit for 8 hrs during the day and be fine, but sitting overnight creates a no start truck in the morning. The fix is dumping some oil in the resevoir to give the truck oil to start. It will start and then 6 seconds later i'll have low pressure oil too.

Here are the quick hitters i'm gonna try to trouble shoot this weekend when i have some spare time.

1) Change the oil and filter, maybe the anti-drain back valve in the filter isn't working properly.

2) Check and clean the anti drain back valve in the top of the engine to make sure debris didn't get lodged in the valve and is holding it open.

Beyond that, I'm lost. I'm wondering if one of the oil plugs in the rear of the engine isn't leaking and letting air into the system and the system to drain out as it sits. . .that's the only other solution i can come up with.

Let me know if i'm missing something, or if you have any further ideas of what could be going on with my poor truck.

Thanks in advance,

01 F250 4X4 Super Cab
6" Pro Comp Lift 315 75 16 SuperSwamper SSR's
Built 97 engine, Dynomite BD's, Swamp's Gen III, H2E, Comp 910's, BWD Pushrods, H-11 Headstuds, BTS Tranny, 5" mitre cut stacks.

[email protected] New times to come after the tranny has been updated and dyno tuned.
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Ok, today's updates:

Oil leak. . .it's not the main seal, it looks like i've got something running down the back of the engine and down and into the bell housing. Maybe the oil galley plug? I'll do some more searching after i get my oil pressure situation figured out.

I bought an oil pressure guage today (O'Riley special. .. set me back a whopin $8. . .it'll do till i get the guage pod and fill it w/some procomp guages). Hooked it up to the hpop resevoir. When it was hot, i had 4-8 psi at idle and couldn't hardly get it over 20 as i ran the truck. Not good! I pulled the oil filter (to change the oil) and started inspecting. There is a valve in the filter head/oil cooler that dumps oil back to the oil pan. It looks to be an overpressure relief valve. It was not seated correctly in the filter head due to crappy manufacturing. I replaced the filter head w/an extra one that was laying around that was assembled correctly. I changed the oil, refilled the coolant, and fired the truck up. Now i had 35psi at idle, but if i reved the truck the pressure would not go up. After driving the truck the oil pressure eventually returned to 6-10psi at idle and driving down the road i would build pressure to 25psi where it would flatline. It seems that replacing the filter head helped my issue, but it is not completely solved. That being said, what pressure should this truck be running at?

The drain back issue has been helped maybe a little. When the truck sat for 5-10 minutes while i returned my waste oil, the oil pressure rose quickly when i restarted the truck. But a little later, it took about 3 seconds to build pressure on the guage after sitting for 10-15 minutes.

I put a check valve in the aux. feed line to the gen III pump and that solved the oil drain back issue so the truck starts right up in the morning.
You really need to check your oil pressure at the rear main bearing port on the bottom rear drivers side of the engine block. Your Big oil set-up draws more oil than normal which typically causes the OP in the reservoir to run lower than what OP is in the main oil gallery.

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