#3542585 - 02/10/17 04:59 PM
Rear Main Starving of Oil
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Member
Registered: 07/17/10
Posts: 272
Loc: Southern, OR
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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?
_________________________
Silver 2003 MGM LS: RIP 305k Dark Purple 2003 MGM LS: 215,XXX miles on body (Engine 315k currently, transplanted from Silver MGM) Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Gas-A-Justs, BH1976 Relay 55/100W, 04 MZT, Mo's Tune. 
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#3544674 - 02/12/17 10:02 PM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Member
Registered: 03/20/16
Posts: 423
Loc: Naples, Fl
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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]
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Member
Registered: 07/17/10
Posts: 272
Loc: Southern, OR
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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.
_________________________
Silver 2003 MGM LS: RIP 305k Dark Purple 2003 MGM LS: 215,XXX miles on body (Engine 315k currently, transplanted from Silver MGM) Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Gas-A-Justs, BH1976 Relay 55/100W, 04 MZT, Mo's Tune.
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#3546513 - 02/15/17 03:51 PM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Over the Hill
Registered: 10/19/13
Posts: 1264
Loc: Argo Nunya
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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?
_________________________
Current Fleet: '42 Indian (14 yrs); '92 HD (26 yrs); '73 2X-Y17 W53-5.7L (13 yrs); '84 1G4-A-H19-3.0L (20 yrs); '87 2G3-G-R47-5.0L (27 yrs); '92 2FA-72-4.6L Police SO/LPO (21 yrs); '02 SAJ-03-4.0L (4 yrs); '04 2T-E-1.8L (14 yrs)
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#3546985 - 02/15/17 08:09 PM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Over the Hill
Registered: 05/10/10
Posts: 4420
Loc: Virginia
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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. 96K mi. .. Stock 2007 Grand Marquis GS. 90K mi. .. Stock 1996 F-150 XLT 196K mi Beater, Stock ---------- My Toys--------- (links are up)1969 Fairlane Cobra 428CJ 4-Speed 1972 Comet GT Restomod 306, C4 1988 Turbo Coupe 331 AOD & 3.73 .. Pressurized ½ Motor is History *****************NEW TOY!!!*********************1969 Base Fairlane 302, C4, 45K mi(really!) Now with P/S & PDB Gonna wake it up with a Blue Print headed 347
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#3547257 - 02/16/17 02:05 AM
Re: Rear Main Starving of Oil
[Re: GrandMarq9807]
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Over the Hill
Registered: 10/19/13
Posts: 1264
Loc: Argo Nunya
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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.
_________________________
Current Fleet: '42 Indian (14 yrs); '92 HD (26 yrs); '73 2X-Y17 W53-5.7L (13 yrs); '84 1G4-A-H19-3.0L (20 yrs); '87 2G3-G-R47-5.0L (27 yrs); '92 2FA-72-4.6L Police SO/LPO (21 yrs); '02 SAJ-03-4.0L (4 yrs); '04 2T-E-1.8L (14 yrs)
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#3547449 - 02/16/17 09:47 AM
Re: Rear Main Starving of Oil
[Re: 2468]
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Over the Hill
Registered: 05/10/10
Posts: 4420
Loc: Virginia
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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. 96K mi. .. Stock 2007 Grand Marquis GS. 90K mi. .. Stock 1996 F-150 XLT 196K mi Beater, Stock ---------- My Toys--------- (links are up)1969 Fairlane Cobra 428CJ 4-Speed 1972 Comet GT Restomod 306, C4 1988 Turbo Coupe 331 AOD & 3.73 .. Pressurized ½ Motor is History *****************NEW TOY!!!*********************1969 Base Fairlane 302, C4, 45K mi(really!) Now with P/S & PDB Gonna wake it up with a Blue Print headed 347
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#3548202 - 02/17/17 01:08 AM
Re: Rear Main Starving of Oil
[Re: GrandMarq9807]
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Over the Hill
Registered: 10/19/13
Posts: 1264
Loc: Argo Nunya
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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?
_________________________
Current Fleet: '42 Indian (14 yrs); '92 HD (26 yrs); '73 2X-Y17 W53-5.7L (13 yrs); '84 1G4-A-H19-3.0L (20 yrs); '87 2G3-G-R47-5.0L (27 yrs); '92 2FA-72-4.6L Police SO/LPO (21 yrs); '02 SAJ-03-4.0L (4 yrs); '04 2T-E-1.8L (14 yrs)
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#3548234 - 02/17/17 03:05 AM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Member
Registered: 07/17/10
Posts: 272
Loc: Southern, OR
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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.
_________________________
Silver 2003 MGM LS: RIP 305k Dark Purple 2003 MGM LS: 215,XXX miles on body (Engine 315k currently, transplanted from Silver MGM) Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Gas-A-Justs, BH1976 Relay 55/100W, 04 MZT, Mo's Tune.
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#3548242 - 02/17/17 07:00 AM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Over the Hill
Registered: 05/10/10
Posts: 4420
Loc: Virginia
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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. 96K mi. .. Stock 2007 Grand Marquis GS. 90K mi. .. Stock 1996 F-150 XLT 196K mi Beater, Stock ---------- My Toys--------- (links are up)1969 Fairlane Cobra 428CJ 4-Speed 1972 Comet GT Restomod 306, C4 1988 Turbo Coupe 331 AOD & 3.73 .. Pressurized ½ Motor is History *****************NEW TOY!!!*********************1969 Base Fairlane 302, C4, 45K mi(really!) Now with P/S & PDB Gonna wake it up with a Blue Print headed 347
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#3548410 - 02/17/17 11:53 AM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Poobah
Registered: 12/09/10
Posts: 9688
Loc: AZ
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Could the sound be the torque converter and not the motor?
_________________________
 75mm DBW TB2005 Grand Marquis GS Two Tone Edition Vibrant White over Arizona Beige The GS Two Tone Package includes: � hood ornament � c-pillar emblems � LS style body side moldings � body color mirror caps (the b-pillars are body color too, but I don't know if that is package specific) � two tone interior (mine is leather and includes embossed logos on the seats) � front door sill plates that say �Grand Marquis� CarDomainFacebook
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#3548690 - 02/17/17 04:37 PM
Re: Rear Main Starving of Oil
[Re: Black_Sunshine]
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Member
Registered: 07/17/10
Posts: 272
Loc: Southern, OR
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Could the sound be the torque converter and not the motor? It's a 5spd.
_________________________
Silver 2003 MGM LS: RIP 305k Dark Purple 2003 MGM LS: 215,XXX miles on body (Engine 315k currently, transplanted from Silver MGM) Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Gas-A-Justs, BH1976 Relay 55/100W, 04 MZT, Mo's Tune.
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#3549250 - 02/18/17 10:08 AM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Over the Hill
Registered: 06/11/11
Posts: 3078
Loc: Mass, USA
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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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#3549570 - 02/18/17 08:52 PM
Re: Rear Main Starving of Oil
[Re: PHoganDive]
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Member
Registered: 07/17/10
Posts: 272
Loc: Southern, OR
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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. If this is true, why is it making a horrible squealing sound with the regular oil cap on at idle? Shouldn't the PCV valves take care of this? Also, if it were blow by, wouldn't my seals be seeping oil everywhere? My engine is bone dry everywhere. Finally, what would cause a squealing sound in the bottom of the engine, at the back, in the first place? Lets say my rings are toast, and I do have blow-by. Still what I'm wondering is what would cause a loud squeal at idle with the regular cap.
Edited by Nebula7 (02/18/17 08:56 PM)
_________________________
Silver 2003 MGM LS: RIP 305k Dark Purple 2003 MGM LS: 215,XXX miles on body (Engine 315k currently, transplanted from Silver MGM) Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Gas-A-Justs, BH1976 Relay 55/100W, 04 MZT, Mo's Tune.
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#3554345 - 02/23/17 05:26 PM
Re: Rear Main Starving of Oil
[Re: Nebula7]
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Member
Registered: 07/17/10
Posts: 272
Loc: Southern, OR
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Just did the compression
1-165
2-155
3-156
4-155
5-160
6-158
7-160
8-160
I don't believe it's blowby...
_________________________
Silver 2003 MGM LS: RIP 305k Dark Purple 2003 MGM LS: 215,XXX miles on body (Engine 315k currently, transplanted from Silver MGM) Mods: TR3650, 70mm BBK TB, ADTR Ported Polished Plenum, Dual H-Pipe Conversion, Gas-A-Justs, BH1976 Relay 55/100W, 04 MZT, Mo's Tune.
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