Lost Oil Pressure - What to Do?
#2192369
11/08/16 08:32 PM
11/08/16 08:32 PM
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Joined: Jul 2011
Posts: 954 Chicago
PurpleBeeper
OP
super stock
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OP
super stock
Joined: Jul 2011
Posts: 954
Chicago
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I was driving home and had pulled up in front of my house (at idle) and heard "rattle, rattle" (440 engine) & saw my oil pressure had dropped to zero, so I shut the motor off. Thank God I was in front of my house. It sounded like the valve gear rattling & not the deep "clunk, clunk" of a rod/main bearing (I'm hoping anyway). The engine did not seem to have any type of misfire.
These are the things that I can think of that could cause this problem. 1. spun main bearing 2. spun rod bearing 3. spun cam bearing (#4, right?) 4. leaking line going to the oil pressure gage 5. oil pump failure 6. REALLY low oil (was 1-1/2 qts. low per aftermarket dipstick). I don't think the pickup sucks air until about 3 qts. low (?) 7. Oil pump failure 8. sheared off the hex end of the oil pump/distributor gear
I'm afraid to even crank the motor until I find the problem. Obviously I don't want to pull the engine if I don't have to.
How do you guys suggest I go about fixing this problem? What order should I check everything? Can I see the hex end of the distributor/oil pump drive if I just pull the pump off? How can I tell if the pump went bad?
Any help is appreciated. Thanks in advance.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2192374
11/08/16 08:40 PM
11/08/16 08:40 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Had #8 happen to me once on a 360.
You can pull the pump, or pull the distributor and rotate the drive out. Easier to do on a 440 than a 360.
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.
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2192375
11/08/16 08:42 PM
11/08/16 08:42 PM
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Joined: May 2015
Posts: 1,134 Lost in Time
Iowan
super stock
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super stock
Joined: May 2015
Posts: 1,134
Lost in Time
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verify the drive, fill with oil and start!
On a big block I had a pump go bad, took out a crank, just that fast.
Relief spring stuck open because of RTV a previous owner had applied to valve covers, I do not use RTV, never have, never will.
Have a great day Iowan
"obsolete is neat"
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2192380
11/08/16 08:48 PM
11/08/16 08:48 PM
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Joined: Aug 2003
Posts: 43,123 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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Did you ever calibrate the after market dipstick to your oil pan? If not drain the oil pan now and look at the oil for shiny metal flakes and measure how much comes out and compare that to what the dipstick shows now before you drain it, that will answer your question on how much it has in it now. While you have the drain plug out look inside at the pickup and see how far it is above the top of the drain plug hole or if it is sitting on the bottom of the oil pan like Ma Mopar suggests to set them up at in the factory service manuals As far as what caused the loss of oil pressure may be answered by looking at the oil in the drain pan and the height of the oil pickup now If it is not a oil starvation problem due to oil level then take the oil pump off and remove the bypass plug and see if the bypass valve is free or stuck inside it, if stuck that is your problem, if not stuck see if the oil pump drive shaft tip is broken off and stuck in the oil pump gear drive hole Do these things now and let us know what you find
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Lost Oil Pressure - What to Do?
[Re: hemi71x]
#2192394
11/08/16 09:07 PM
11/08/16 09:07 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Bent push rod. Lifter popped out of it's bore. Pull the valve covers.
I had that happen on a 400. Damn, I'm a jinx
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.
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2192855
11/09/16 09:33 AM
11/09/16 09:33 AM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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In 1975 my 383 pump failed just south of 80,000 miles, at startup, I let it run just a hair too long and developed terminal knock.
Robert
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2192964
11/09/16 12:42 PM
11/09/16 12:42 PM
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Joined: Jan 2003
Posts: 13,354 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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The first thing I'd do is pull the valve covers and look for a pushrod out of place. If there is one that's out of place, look to see if the lifter popped out...that will kill your oil pressure and probably not hurt the motor at all otherwise. Obviously you need to find out why the pushrod got loose...rocker adjuster issue, cam lobe going flat, etc.
If all is good under the valve covers, pull the distributor and check the oil pump driveshaft. It may be broken. If it is, pull the oil pump off and inspect it.
Then I'd drain the oil, check for glitter in it, and cut open the oil filter.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Lost Oil Pressure - What to Do?
[Re: hemi71x]
#2196187
11/14/16 02:34 PM
11/14/16 02:34 PM
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Joined: Jan 2003
Posts: 386 milwaukee
superbird
enthusiast
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enthusiast
Joined: Jan 2003
Posts: 386
milwaukee
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Bent push rod. Lifter popped out of it's bore. Pull the valve covers.
had a sticky valve cause this
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2226296
01/03/17 02:00 PM
01/03/17 02:00 PM
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Joined: Jul 2011
Posts: 954 Chicago
PurpleBeeper
OP
super stock
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OP
super stock
Joined: Jul 2011
Posts: 954
Chicago
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I got VERY LUCKY.... thank you God. It was #6 & I shut the motor off in time.
6. REALLY low oil (was 1-1/2 qts. low per aftermarket dipstick). I don't think the pickup sucks air until about 3 qts. low (?)
The dipstick (aftermarket) was about 1 qt. off & I calibrated it when I changed the oil. I was at least 2-1/2 qts. low on oil (likely 3 qts. low) and the pickup sucked air for about 20 seconds.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: Lost Oil Pressure - What to Do?
[Re: PurpleBeeper]
#2226302
01/03/17 02:13 PM
01/03/17 02:13 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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what I do is have the car level. add 4 qts (for a std 4 qt sump pan) from scratch. mark the stick full at that point. this takes the filter out of the equation & this is with it previously primed so the passages everything is filled
live every 24 hour block of time like it's your last day on earth
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