Re: Clogged pick-up or oil pump failing?
[Re: mgoblue9798]
#2303366
05/12/17 03:03 PM
05/12/17 03:03 PM
|
Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,376
|
1. Well, the tapping upon gauge loss of oil pressure indicates that it really is low oil pressure.
2. Most oil filters have a bypass that lets oil around the filter when the filter can't pass enough. So unless you specially bought a filter with no bypass, it isn't the filter.
3. I've never heard of gunk INSIDE an oil pickup tube
4. The scenario of stuff clogging the pickup SCREEN is plausible.
5. ALL commonly sold motor oil has detergent in it. So the idea of a "detergent" oil cleaning up an engine that had only been run on "non-detergent" motor oil is just plain wrong, unless one is starting an engine that hasn't been run for more than a half century.
6. Diesel lubricating oils have high levels of detergent because the oil carries a truckload of soot
7. My initial diagnosis was sticking bypass valve in the oil pump. That would explain the on/off nature of your problem.
8. DO change the filter first, it is inexpensive and easy to do. Then drive the truck and see if it happens again.
9. If that doesn't work, you have to drop the pan. While you're in there, change the pump. I have wasted two engines because I didn't change the pump. The original oil pump looked fine, but once engine warmed up, oil pressure went to around 5 psi.
10: To check the condition of rod and main bearings, look at the #1 main and the #1 rod journal. As these two bearings get their oil last, they are the first to go. My second 318 crank is reusable except the underside of the #1 throw is terribly ground down. The #2 rod bearing was perfect. On the same rod journal I had both no wear and extreme wear.
11. One of the culprits I see here at work all the time is shuttle valves sticking because of varnish buildup.
R.
R.
Last edited by dogdays; 05/12/17 03:08 PM.
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: Adam71Charger]
#2303520
05/12/17 08:19 PM
05/12/17 08:19 PM
|
Joined: Jan 2003
Posts: 10,943 North Dakota
6PakBee
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,943
North Dakota
|
Pull the pan. By the time you go through all the "easy" stuff you won't have any engine left. The fact that the cam went south for the PO and he didn't pull the pan is a red flag.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: 6PakBee]
#2303621
05/12/17 11:46 PM
05/12/17 11:46 PM
|
Joined: Aug 2006
Posts: 2,564 God's Country Maryland
GODSCOUNTRY340
master
|
master
Joined: Aug 2006
Posts: 2,564
God's Country Maryland
|
Pull the pan. By the time you go through all the "easy" stuff you won't have any engine left. The fact that the cam went south for the PO and he didn't pull the pan is a red flag. +1, The previous owner already told you the engine ate a cam, so, all that metal clogged his filter, it bypassed due to the clog sending unfiltered dirty oil through your engine. Your oil pump took the first hit, it probably looks like it's been sand blasted internally. The metal filings have your oil pump pressure valve sticking causing your pressure variations. Before running the engine any more drop the pan, replace the pump, check your main and rod bearings to see how much damage they took. You may get lucky and find the bearings aren't too bad but I'd say they received some damage too.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: GODSCOUNTRY340]
#2303793
05/13/17 12:00 PM
05/13/17 12:00 PM
|
Joined: Feb 2003
Posts: 16,189 Mesa, Arizona
dart4forte
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 16,189
Mesa, Arizona
|
Might help if you bleed the air out of that clear tube going into gauge. If there's air in the line the gauge doesn't read properly. Just fire up the motor, crack open the line at the gauge and when you have oil escaping without air bubbles tighten the line. Let's see what the gauge reads after that.
“So if it’s on the internet it must be true”
Abe Lincoln
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: blewbyu]
#2304128
05/14/17 12:36 AM
05/14/17 12:36 AM
|
Joined: Jun 2003
Posts: 7,673 SK. Canada
Not_A_Duster
master
|
master
Joined: Jun 2003
Posts: 7,673
SK. Canada
|
I bet the valve seals got hard and cracked into pieces and fell down into oil pan and clogged the pick up screen. How do I know this? This will relate to no oil pressure. I seen it several times over the years. Yup. Experienced exactly this on two different LA engines. Identical symptoms to the OP...
....evil is winning....
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: Adam71Charger]
#2304306
05/14/17 01:37 PM
05/14/17 01:37 PM
|
Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
|
Did you pull the bypass out of the pump?
It takes only a very very small piece of debris to make it stick.
Believe the gauge........ It coincides with the lifters clattering.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: elmor353]
#2304783
05/15/17 11:17 AM
05/15/17 11:17 AM
|
Joined: Jan 2003
Posts: 10,943 North Dakota
6PakBee
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,943
North Dakota
|
Okay, now before you do anything rash think about what you have found. If the pump is good (including the relief valve), the pickup screen and tube are clean with no cracks, and the oil pump drive gear isn't slipping on the shaft, the oil pump HAS to work. It has no choice. There is still something there.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
|
|
|
Re: Clogged pick-up or oil pump failing?
[Re: Adam71Charger]
#2304801
05/15/17 11:57 AM
05/15/17 11:57 AM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
Possibly, the oil pump drive shaft is slipping inside the drive gear?
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
|
|
|
|
|