PHP Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in ..../includes/class_bootstrap.php(433) : eval()'d code on line 106
Mercury door lock cylinders
PotM GrandMarq.NET - Panther Headquarters Forum Index PotM
GMN Chat Room GMN's STORE!! GMN's Gallery Please!!
Results 1 to 16 of 16

Thread: Mercury door lock cylinders

  1. #1

    Default Mercury door lock cylinders

    I know this is the engine forum but it gets the most traffic, so I'll plead guilty if I get charged with posting in the wrong place.

    My driver's side door lock cylinder is warning me of its pending doom, so I'd like to replace it before I have to get in on the passenger side and do the crawl-through of shame.

    Being a Mercury, it has the big square exterior bezel with the little courtesy light ring around the keyhole. I've never taken it apart - is the standard replacement/Crown Vic style lock cylinder underneath the lighted bezel?

  2. #2
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    23,627

    Default

    It's extremely rare that it's the lock cylinder itself. It's usually the lock actuator that's binding up. The lock actuator is directly linked to the lock cylinder and there is no slip mechanism like in the aero and whale actuators.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  3. #3

    Default

    No doubt that it’s rare but by the feel of it I’m very sure it’s the lock cylinder. A gentle wiggle of the key and it turns easily.

  4. #4
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    23,627

    Default

    Ah... that issue. May be a worn out key or a worn out pin in the tumbler. They can be rebuilt, but you're probably pretty relegated to JY replacement if the issue is actually in the tumbler. Sometimes some wd-40 followed with some proper lube will flush out any burrs and fix the hang-ups. In fact, it could be a pin hanging up in the tumbler and the jiggle gets it to drop into the correct setting on the key. If you haven't already, try a little lube. I typically use white lithium grease for those since the lube will stay up in the pins a little better. Others may have other suggestions.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  5. #5
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    980

    Default

    I use Houdini Spray Lube. Works like a charm!
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  6. #6
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    980

    Default

    As an aside, post are showing up with the incorrect hour (5:12 is showing up as 6:12). I think this has happened before and there is something I need to do but don't remember.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  7. #7
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    23,627

    Default

    In user settings, change the time zone or check adjust for DST or something like that. I always ignore the time stamps myself.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  8. #8
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    980

    Default

    Just gave it a shot so we'll see how it works. Don't want, however, to hijack this thread.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  9. #9
    Member Stocker's Avatar
    Join Date
    Jul 2014
    Location
    The Land of Sky-Blue Waters
    Posts
    150

    Default

    No doubt that it’s rare but by the feel of it I’m very sure it’s the lock cylinder. A gentle wiggle of the key and it turns easily.
    Is the key just worn out? Measure the depths - specs are .208, .188, .168, .148, and .128, as measured from the bottom of the groove on the opposing side. (Assuming this is '89 or earlier)

    To the original question, I vaguely recall that the lighted bezel is part of the lock cylinder assembly and not a separate piece, but it's been a long time since I've seen one.
    1985 LTD Crown Victoria
    1977 Oldsmobile Cutlass Supreme
    1996 Dodge Ram 1500 4x4, 360

    Past: 1995 Crown Victoria Police Interceptor

  10. #10
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    980

    Default

    Not sure any OEM replacements are still around. Probably only Chinese knock offs and it they are one piece, with the bezel, good luck! What year/model are you looking for? If you can't find one I would look for a good locksmith (NOT a key maker) to repair the one you already have if a good lube doesn't work. He/she could then make a new key and you should be all set. This is all assuming the lock actuator or linkage are not issues.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  11. #11
    GMN Regular WagonMan's Avatar
    Join Date
    Sep 2004
    Location
    Bridgewater Ct.
    Posts
    957

    Default

    I'm sure you tried the key both ways? One of my cars the one side of the key is worn more than the other. Sometimes I have to flip the key over to unlock the door. The Lighted lock cylinders are left and right specific. 89 down are square, 90-91 have rounded edges. I have lots of lock cylinders,(with keys) if anybody needs them. WagonMan
    89 Colony Park
    90 Colony Park
    70 HEMI Daytona Convertible

  12. #12

    Default

    Thanks for the replies. I considered that the key might be worn but I don’t have any trouble on the passenger side. My car is an 89 so it’s the big square one. There are a couple good locksmiths in my town so maybe I’ll give that a try. Failing that I might just go to the round style.

  13. #13
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    980

    Default

    Probably a worn cylinder but I'd lube it and the linkage if you feel like getting to it. Good locksmith is the next move if you are sure the actuator is working well.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  14. #14
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    41,798

    Default

    I've never done a door cylinder but having done ignition cylinders I can't imagine its all that hard. More fussy than anything, the pins and springs are small and easily lost or damaged.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  15. #15
    Member Stocker's Avatar
    Join Date
    Jul 2014
    Location
    The Land of Sky-Blue Waters
    Posts
    150

    Default

    Thanks for the replies. I considered that the key might be worn but I don’t have any trouble on the passenger side. My car is an 89 so it’s the big square one. There are a couple good locksmiths in my town so maybe I’ll give that a try. Failing that I might just go to the round style.
    The passenger side has almost no wear on the pins either. Pin wear and key wear combined on the driver's side can be a cause of the problem you describe.

    Having a new key accurately cut is the easiest thing to try (and your trunk lock will probably be happier too).

    The past few vehicles I've bought, I've had keys cut to code soon after purchase to prevent issues like this.
    1985 LTD Crown Victoria
    1977 Oldsmobile Cutlass Supreme
    1996 Dodge Ram 1500 4x4, 360

    Past: 1995 Crown Victoria Police Interceptor

  16. #16
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    23,627

    Default

    Could always swap the key cylinders between the doors. I think the only thing you would have to do is rotate the tab on the rear that hooks on the rod. It's been several years since I looked at one though, so not entirely sure that would actually work.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
GMN Approved Links!


www.rockauto.com www.adtr.net