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Old 10-14-2014, 10:18 AM   #1
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No oil pressure.

Went out to make a video and engine started up good. Check gage light came on, no oil pressure. Did the gage cluster check and gage tested good. Pulled the oil pressure sensor and had the wife start it up and no oil pressure. Yesterday after the cam change was completed I let it idle up to temperature and then drove it about 10 miles, came back and let it ldle a little checked the gages all was good. Turned it off at idle without rev up. Only thing I can think of is a paper towel I had wadded up to block the drains in the head fell into the pan and is blocking the pickup. Anyone with an unexplained oil pressure loss? Not a happy camper at the moment.

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Old 10-14-2014, 11:01 AM   #2
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Bummer!!! Greg if IIRC the top port goes to the top of the motor and the lower port goes to the pump. You could try pulling the oil filter and see if the oil pump is actually pumping. Hope you get this figured out, we want that vid. lolol
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Old 10-14-2014, 11:32 AM   #3
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Pull the filter and see if anything squirts. It will be messy for sure if it does. If not try priming the eng thru the pressure port hole. Did you remove the pump to change the chain or run the stock chain. Possible the seal or bolt fell out of pickup tube?
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Old 10-14-2014, 11:52 AM   #4
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If I read correctly you already drove it for 10 miles withour problems and then when the problem started you removed the oil sensor to see if oil squirts out of the sensor hole in the block, but none came out?

If that's the case I doubt it's a priming problem since you already ran is 10miles, first thing I would look at is the oil pickup in the pan.
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Old 10-14-2014, 01:36 PM   #5
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Thanks guys, Yes I've driven around the block, (10 miles). Probably ran yesterday for a total of 1-1/2 hours with no issues. Fired this morning, got out and walked to the rear to listen to the exhaust and went back in and the Check gauge light was on. Oil pressure not showing anything. Went through the drill checking the gage cluster and pulled the oil sensor. No pressure at all. Removed the filter to see if maybe something was stuffed into it. Nada....
Removed the pan, which requires jacking the engine up a little. Removed the pickup tube and it is clear. Looked at the pump, don't see anything wrong. Will pull the front off the engine tomorrow. Has to be the pump, I probably broke it putting the harmonic balancer on.
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Old 10-15-2014, 07:42 AM   #6
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Well the weather is not helping this morning. Got rain water running through my carport. Not making anything easy for me. Such is life. Ordered a Mellings pump so nothing really going to happen until it arrives. Wish I knew where I went wrong.... lol
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Old 10-15-2014, 09:17 AM   #7
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Something stupid will show up when you pull it apart I bet.
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Old 10-15-2014, 02:21 PM   #8
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Quote:
Originally Posted by charged392 View Post
Something stupid will show up when you pull it apart I bet.
The only stupid that showed up was me...
Pulled it all apart and disassembled the pump. The pump is pristine, if I told you it came out of a 30k engine you would probably agree. I didn't disassemble the relief valve, but just looking, it appears to be closed. Pickup tube "O" ring looks good. I flushed the pickup tube with solvent and it is clean. The pump not picking up oil remains a mystery. With that said it was good I took the front off. The driverside timing chain rub block was not seated and cockeyed. When I pulled it for the cam change it was also cockeye'd. I pushed it back in place with a nice loud snap sound and I thought it was good. This time I changed the timing chain set for a Crower setup. Same as the original but with offset degree plugs. I'll order a new pickup tube O ring tomorrow and the new pump should be here in a couple days. So hemi guru's what would cause the loss of pump prime. I might mention I had one hell of a time getting the crank bolt broke loose. That sucker was tight. Had to make a jury rig tool to hold it while I loosen it.
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Old 10-15-2014, 04:02 PM   #9
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Just throwing this out there... Could a faulty filter cause this problem? Just looking at the filter it looks ok..
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Current 60' PB 1.351 (2019) mechanical issue for 1/4m

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Old 10-15-2014, 04:06 PM   #10
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A faulty filter could cause a pressure issue yes but I would think you would see a nice size obstruction.

As for loosing prime only real way is torn oring,coolant filled oil or bad pump. In rare situations the pump cracks but that's very rare.
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