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#3542585 - 02/10/17 04:59 PM Rear Main Starving of Oil
Nebula7 Offline
Member

Registered: 07/17/10
Posts: 240
Loc: Southern, OR
I have a 2003 MGM 290,000mi, and have an issue with the rear main starving of oil. I have replaced the PCV valves, and they are free, I have done oil changes every 5k since 40k, and very picky about maintenance.

I noticed when I remove the oil cap, the sound goes away, and only does it when below 1,200rpm. I've been running a K&N crank case breather on place of the oil cap, as a band aid. It has solved the issue, but now leaks oil through the filter when I get on it, allowing oil all over the passenger side valve cover, so I'd like to fix the issue. This problem doesn't seem very common.

I'm at a bit of a loss, and wondering if anyone has clues?
_________________________
2003 MGM LS. 290,XXX miles
Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Heinous Rear Control Arms, Gas-A-Just shocks, BH1976 Relay Upgrade 55/100W, 3L27 31 spline axle rebuild, 04 P71 Zip/Airbox 80mm MAF, Mo's Speed Shop Tune.

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#3544674 - 02/12/17 10:02 PM Re: Rear Main Starving of Oil [Re: Nebula7]
85ltdcrownvic Offline
Member

Registered: 03/20/16
Posts: 404
Loc: Naples, Fl
Have you done a compression test?

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#3544714 - 02/12/17 10:19 PM Re: Rear Main Starving of Oil [Re: Nebula7]
Nebula7 Offline
Member

Registered: 07/17/10
Posts: 240
Loc: Southern, OR
The last compression test was done in 2014, and I had 110-130 in all cylinders (lowest cylinder 8). I haven't done one since 2014 (248k), but I was going to do one on my F150 soon, so it'd be a good time. I just need to figure out how to get a coil out on cylinder #1, as the bolt just spins... I can update as I do the test.
_________________________
2003 MGM LS. 290,XXX miles
Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Heinous Rear Control Arms, Gas-A-Just shocks, BH1976 Relay Upgrade 55/100W, 3L27 31 spline axle rebuild, 04 P71 Zip/Airbox 80mm MAF, Mo's Speed Shop Tune.

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#3545082 - 02/13/17 09:52 AM Re: Rear Main Starving of Oil [Re: Nebula7]
85ltdcrownvic Offline
Member

Registered: 03/20/16
Posts: 404
Loc: Naples, Fl
You might as well do a good old vacuum test as well to confirm what it could be. It sounds to me like the rings are going though. 110-140 isnt bad but its not where it should be.

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#3545298 - 02/13/17 12:25 PM Re: Rear Main Starving of Oil [Re: Nebula7]
Boss429 Offline
Member

Registered: 02/25/09
Posts: 127
Loc: Dayton,Ohio
the Mod motor has a very robust bottom end,including oiling system and main webs, I dont see a rear main bearing being singled out when i rebuild these units here, some with 400,000 miles and nearly 8000 idle hours. chain tensioners, Yes. Im perplexed with your question. 2006 CVPI

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#3546513 - 02/15/17 03:51 PM Re: Rear Main Starving of Oil [Re: Nebula7]
2468 Offline
Climber

Registered: 10/19/13
Posts: 690
Loc: Argo Nunya
Originally Posted By Nebula7
I have a 2003 MGM 290,000mi, and have an issue with the rear main starving of oil. I have replaced the PCV valves, and they are free, I have done oil changes every 5k since 40k, and very picky about maintenance.

I noticed when I remove the oil cap, the sound goes away, and only does it when below 1,200rpm. I've been running a K&N crank case breather on place of the oil cap, as a band aid. It has solved the issue, but now leaks oil through the filter when I get on it, allowing oil all over the passenger side valve cover, so I'd like to fix the issue. This problem doesn't seem very common.

I'm at a bit of a loss, and wondering if anyone has clues?


How's your oil pressure? Could the pump be below par?

Could there be any clogged passages? What about a clog at the pick up screen? My Buick started knocking & I found the pickup screen was clogged with debris from an internal nylon plastic part that shredded.

When I read about the band aid fix, I initially thought about a CCV problem, maybe from a collapsed or clogged hose, but your not getting oil coming out anyplace besides the breather you're using for the oil cap, are you?

With the lack of lubrication, are you sure you want to be driving it?
_________________________
Owner/Maintainer '92 Crown Vic P72 Police for the past 20 years.

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#3546985 - 02/15/17 08:09 PM Re: Rear Main Starving of Oil [Re: Nebula7]
GrandMarq9807 Offline
Over the Hill

Registered: 05/10/10
Posts: 3933
Loc: Virginia
AFAIK unless there is a oil galley blocked in the bottom end of block you can't starve one bearing of oil... If it pushing oil out the breather, then engine is just likely tired and has a blow by issue...
_________________________
1998 Grand Marquis LS. 77K mi.
2007 Grand Marquis GS. 78K mi.
1996 F-150 XLT 5.0 E4OD 189K mi
1988 Turbo Coupe 331 AOD & 3.73
1969 Fairlane Cobra 428CJ 4-Speed
1972 Comet GT - 306 C4 <<< Under Hood



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#3547257 - 02/16/17 02:05 AM Re: Rear Main Starving of Oil [Re: GrandMarq9807]
2468 Offline
Climber

Registered: 10/19/13
Posts: 690
Loc: Argo Nunya
Originally Posted By GrandMarq9807
AFAIK unless there is a oil galley blocked in the bottom end of block you can't starve one bearing of oil...


That thought crossed my mind. Was wondering what led to determining it is just the rear main.
_________________________
Owner/Maintainer '92 Crown Vic P72 Police for the past 20 years.

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#3547449 - 02/16/17 09:47 AM Re: Rear Main Starving of Oil [Re: 2468]
GrandMarq9807 Offline
Over the Hill

Registered: 05/10/10
Posts: 3933
Loc: Virginia
Originally Posted By 2468
Originally Posted By GrandMarq9807
AFAIK unless there is a oil galley blocked in the bottom end of block you can't starve one bearing of oil...


That thought crossed my mind. Was wondering what led to determining it is just the rear main.

If oil pressure was so low/restricted it was starving a main bearing the rods would have been burned up long ago, as oil feeds to mains then to rods... Imaginary problem... Or at least a incorrect diagnosis...
_________________________
1998 Grand Marquis LS. 77K mi.
2007 Grand Marquis GS. 78K mi.
1996 F-150 XLT 5.0 E4OD 189K mi
1988 Turbo Coupe 331 AOD & 3.73
1969 Fairlane Cobra 428CJ 4-Speed
1972 Comet GT - 306 C4 <<< Under Hood



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#3548202 - 02/17/17 01:08 AM Re: Rear Main Starving of Oil [Re: GrandMarq9807]
2468 Offline
Climber

Registered: 10/19/13
Posts: 690
Loc: Argo Nunya
Originally Posted By GrandMarq9807
If oil pressure was so low/restricted it was starving a main bearing the rods would have been burned up long ago, as oil feeds to mains then to rods... Imaginary problem... Or at least a incorrect diagnosis...


I'm under impression OP hears the bottom end knocking, maybe?
_________________________
Owner/Maintainer '92 Crown Vic P72 Police for the past 20 years.

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#3548234 - 02/17/17 03:05 AM Re: Rear Main Starving of Oil [Re: Nebula7]
Nebula7 Offline
Member

Registered: 07/17/10
Posts: 240
Loc: Southern, OR
It's not knocking. It's a peculiar sound, kind of like an old dryer. It has a squeal that doesn't go away unless above 1200rpm, and comes from the bottom end, towards the rear of the engine.

It is possible, an oil gallery is plugged due to the one guide breaking off in the past.

The tab above my finger (bolt) is the only piece to be in the pan. The passenger side was fine.

I don't know if it's blow by, but I run a vacuum gauge while driving, and the readings from 1200ft have not changed any bit since 5yrs ago.

I haven't gotten around to the compression check due to excessive rain, I will update with numbers when I can.
_________________________
2003 MGM LS. 290,XXX miles
Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Heinous Rear Control Arms, Gas-A-Just shocks, BH1976 Relay Upgrade 55/100W, 3L27 31 spline axle rebuild, 04 P71 Zip/Airbox 80mm MAF, Mo's Speed Shop Tune.

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#3548242 - 02/17/17 07:00 AM Re: Rear Main Starving of Oil [Re: Nebula7]
GrandMarq9807 Offline
Over the Hill

Registered: 05/10/10
Posts: 3933
Loc: Virginia
I dunno what the problem is but it is NOT a main bearing, a squealing main bearing would destroy itself in just a few seconds...

As long as a engine has fairly even compression on all cylinders actual numbers don't mean much for vacuum... On my Comet vacuum was steady and easily pulled 18-20" but due to to someone installing later, big chamber heads, only regestered 95-110 psi cranking...
_________________________
1998 Grand Marquis LS. 77K mi.
2007 Grand Marquis GS. 78K mi.
1996 F-150 XLT 5.0 E4OD 189K mi
1988 Turbo Coupe 331 AOD & 3.73
1969 Fairlane Cobra 428CJ 4-Speed
1972 Comet GT - 306 C4 <<< Under Hood



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#3548410 - 02/17/17 11:53 AM Re: Rear Main Starving of Oil [Re: Nebula7]
Black_Sunshine Offline
Poobah

Registered: 12/09/10
Posts: 9259
Loc: AZ
Could the sound be the torque converter and not the motor?
_________________________


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#3548690 - 02/17/17 04:37 PM Re: Rear Main Starving of Oil [Re: Black_Sunshine]
Nebula7 Offline
Member

Registered: 07/17/10
Posts: 240
Loc: Southern, OR
Originally Posted By Black_Sunshine
Could the sound be the torque converter and not the motor?


It's a 5spd.
_________________________
2003 MGM LS. 290,XXX miles
Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Heinous Rear Control Arms, Gas-A-Just shocks, BH1976 Relay Upgrade 55/100W, 3L27 31 spline axle rebuild, 04 P71 Zip/Airbox 80mm MAF, Mo's Speed Shop Tune.

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#3549250 - 02/18/17 10:08 AM Re: Rear Main Starving of Oil [Re: Nebula7]
PHoganDive Offline
Over the Hill

Registered: 06/11/11
Posts: 3043
Loc: Mass, USA
Originally Posted By Nebula7
I have a 2003 MGM 290,000mi, and have an issue with the rear main starving of oil. I have replaced the PCV valves, and they are free, I have done oil changes every 5k since 40k, and very picky about maintenance.

I noticed when I remove the oil cap, the sound goes away, and only does it when below 1,200rpm. I've been running a K&N crank case breather on place of the oil cap, as a band aid. It has solved the issue, but now leaks oil through the filter when I get on it, allowing oil all over the passenger side valve cover, so I'd like to fix the issue. This problem doesn't seem very common.

I'm at a bit of a loss, and wondering if anyone has clues?

If it is leaking oil out the breather when you get on it, that indicates you have a lot of blow-by from the piston rings, which is pressurizing the crankcase when you get on it, and venting out the breather/filter, along with any oil in the filter. Your sig says the car is leaning on 300K miles, so it's entirely possible the piston rings are simply worn out.
The PCV system handles normal blow-by, but in your case it looks like the amount exceeds it's capacity, and the excess goes out the vent cap when the motor is under load.
_________________________

2006 CVPI w/120K, J-Mod, MSD COPs, BOC Tune, American Muscle Wheels, Magnaflow Stainless Catback Duals, 35% tint, UltraGuage, headlight relay harness installed w/ 80/100 watt bulbs.

1996 GMQ 116K miles, Bilstein shocks, otherwise stock (Retired 7/2011)

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