door will not lock - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72timemachine · 10-28-2009, 02:34 AM

I noticed the other day that when I lock the door on my 72 c/10 that the door knob goes down (it looks locked) but you can open the door just the same.

I rolled down the window and looked in with a flashlight at the lock and linkage and saw nothing obvious, has this happened to anyone else?

Thanks ahead of time for any help.

cdowns · 10-28-2009, 07:46 AM

have u tried logking with key to see if that wotks

**too much stuff** · 10-28-2009, 08:48 AM

Pretty sure you have to use the key to lock the doors. Call it idiot proof.

leh72super1500 · 10-28-2009, 10:08 PM

My locks just pop back up when the door is shut, even when you hold the door handle button in. It says in the owner manual you must lock it with the key,

Andy4639 · 10-28-2009, 10:22 PM

evilways · 10-29-2009, 07:40 PM

Make sure your locking it completely, and what I mean is while you turn the key press on the door a little with your knee from the outside, If your door doesn’t fit perfectly it won’t lock, the lock will drop about a quarter of an inch but it is not fully locking, so try and push as you lock with the key,

If you are just locking and closing then leh72super1500 is correct it will not allow you to lock your door and then close, you can only lock with the key from the outside.

Just and idea.

sakid · 11-18-2009, 10:52 AM

I don't know if you've already solved your problem, but I also have this problem with my '72 k20. I found that when the door latches the geared wheel in the door is off by about an 1/8th of an inch or less and this causes the lock mechanism to hit the tooth instead of the valley between the teeth. I haven't tried to re-align the door because it seems to be okay. I did mess with the striker plate and it didn't help. I'm considering just grinding off some of the lock tooth if I can't get it to work. Hope I'm not too much of a butcher. I'd rather fix it properly.

geezer#99 · 11-18-2009, 11:18 AM

I had the same problem as Sakid. Thought I could do a little grinding too. Waste of time. Can't because the metal is hardened. Made no difference so I bought new latches. Works great now. Parts get worn out after 40 years. Easier to replace them with new.

sakid · 11-19-2009, 12:45 AM

Thanks geezer. I was actually looking at it again today saw that the bushing or pin that the gear rides on is quite worn and figured that'd be the way to go. I haven't checked at Lordco (I see you're from Nanaimo) yet, but if they don't have this vintage of parts do you suggest a good aftermarket source for these trucks. Thanks so much for your help.

geezer#99 · 11-19-2009, 01:00 AM

Bought mine from LMC. Don't think Lordco would have them. Check out LMC.com if you haven't already. I think mine were 100 bucks a pair.

sakid · 11-19-2009, 01:08 AM

Awesome, thanks. I didn't think Lordco would. I also came across this site from a place in Lacombe AB, but the online catalogue isn't up right now so I can't speak for their prices. Thought it might be of some help some time. http://www.classicbowtie.com/Page%201.htm

Cheyenne Supr · 06-13-2010, 08:58 PM

I just saw this string doing a search. I've got the exact same problem as sakid & geezer...it appears the geared wheel is about an 1/8" off from the lock mechanism. I'm restoring the truck...cab is all together and I have the same problem with both doors. Guess I need new latches. Did that work for yours sakid? My doors line up perfectly too...I moved the striker around in multiple positions but nothing has helped.
Thanks.

sakid · 06-14-2010, 12:50 AM

I'd love to say that I fixed it, but the truth is that it's been in my back yard for the past 6 months or so and I haven't worked on it. I looked into new mechanisms and here in canada they're worth about $65 a side, new. I figured, when I'm ready to get it done, that was pretty reasonable. Let me know how it goes if you don't mind.

Sillyoldman · 06-14-2010, 12:57 AM

My ds door is the same. I never bothered to fix it. I lift on the handle while I lock it with my key.

Cheyenne Supr · 06-14-2010, 08:29 AM

Well, I kept playing around with it. I think the problem is 40 yr old worn gear locks (as several have mentioned in similar strings) combined with the new weatherstripping. By moving the strikers out slightly I was finally able to lock both doors, but I have to push in fairly hard on the doors to get them to lock. The strikers were almost all the way out already, and if I play with them too much the doors won't close properly. My guess is that new latches would improve the situation, but I'll hold off on that since I did finally get them to lock by applying pressure on the doors.
Thanks for your feedback.

10-28-2009, 02:34 AM	#1
72timemachine Registered User Join Date: Oct 2008 Location: los angeles ca Posts: 210	door will not lock I noticed the other day that when I lock the door on my 72 c/10 that the door knob goes down (it looks locked) but you can open the door just the same. I rolled down the window and looked in with a flashlight at the lock and linkage and saw nothing obvious, has this happened to anyone else? Thanks ahead of time for any help.

10-28-2009, 07:46 AM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: door will not lock have u tried logking with key to see if that wotks __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-28-2009, 08:48 AM	#3
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,714	Re: door will not lock Pretty sure you have to use the key to lock the doors. Call it idiot proof. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

10-28-2009, 10:08 PM	#4
leh72super1500 GMC with Blue Plaid Join Date: Oct 2009 Location: Langdon, Alberta Posts: 139	Re: door will not lock My locks just pop back up when the door is shut, even when you hold the door handle button in. It says in the owner manual you must lock it with the key, __________________ Current: 1972 GMC Super Custom 1500 402 < 73K Orig MI 2015 GMC Canyon SLT(Daily Driver) Previous: 2008 Chevrolet Colorado LT 2.9L I4 1988 Chevrolet Suburban Silverado 10 350 < 60K Orig MI 1984 GMC S-15 2.8L V6 1976 GMC Sierra Classic 2500 Camper Special 350 1980 GMC High Sierra 3500 Dually 350 4spd 1974 Chevrolet Cheyenne Super 10 Shorty 454 (Was my Dads, I wish I still had it) 1969 GMC 910 250 I6 4spd

10-28-2009, 10:22 PM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: door will not lock __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-29-2009, 07:40 PM	#6
evilways Registered User Join Date: Mar 2008 Location: Lafayette, IN Posts: 226	Re: door will not lock Make sure your locking it completely, and what I mean is while you turn the key press on the door a little with your knee from the outside, If your door doesn’t fit perfectly it won’t lock, the lock will drop about a quarter of an inch but it is not fully locking, so try and push as you lock with the key, If you are just locking and closing then leh72super1500 is correct it will not allow you to lock your door and then close, you can only lock with the key from the outside. Just and idea. __________________ Mark 1967 C/10 stepside lwb daily driver 1968 C/10 fleetside lwb parts truck 1971 Cheyenne Super swb project

11-18-2009, 10:52 AM	#7
sakid Registered User Join Date: Nov 2009 Location: Salmon Arm, BC Posts: 6	Re: door will not lock I don't know if you've already solved your problem, but I also have this problem with my '72 k20. I found that when the door latches the geared wheel in the door is off by about an 1/8th of an inch or less and this causes the lock mechanism to hit the tooth instead of the valley between the teeth. I haven't tried to re-align the door because it seems to be okay. I did mess with the striker plate and it didn't help. I'm considering just grinding off some of the lock tooth if I can't get it to work. Hope I'm not too much of a butcher. I'd rather fix it properly.

11-18-2009, 11:18 AM	#8
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,522	Re: door will not lock I had the same problem as Sakid. Thought I could do a little grinding too. Waste of time. Can't because the metal is hardened. Made no difference so I bought new latches. Works great now. Parts get worn out after 40 years. Easier to replace them with new.

11-19-2009, 12:45 AM	#9
sakid Registered User Join Date: Nov 2009 Location: Salmon Arm, BC Posts: 6	Re: door will not lock Thanks geezer. I was actually looking at it again today saw that the bushing or pin that the gear rides on is quite worn and figured that'd be the way to go. I haven't checked at Lordco (I see you're from Nanaimo) yet, but if they don't have this vintage of parts do you suggest a good aftermarket source for these trucks. Thanks so much for your help.

11-19-2009, 01:00 AM	#10
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,522	Re: door will not lock Bought mine from LMC. Don't think Lordco would have them. Check out LMC.com if you haven't already. I think mine were 100 bucks a pair.

11-19-2009, 01:08 AM	#11
sakid Registered User Join Date: Nov 2009 Location: Salmon Arm, BC Posts: 6	Re: door will not lock Awesome, thanks. I didn't think Lordco would. I also came across this site from a place in Lacombe AB, but the online catalogue isn't up right now so I can't speak for their prices. Thought it might be of some help some time. http://www.classicbowtie.com/Page%201.htm

06-13-2010, 08:58 PM	#12
Cheyenne Supr Registered User Join Date: Dec 2003 Location: Nashville Posts: 48	Re: door will not lock I just saw this string doing a search. I've got the exact same problem as sakid & geezer...it appears the geared wheel is about an 1/8" off from the lock mechanism. I'm restoring the truck...cab is all together and I have the same problem with both doors. Guess I need new latches. Did that work for yours sakid? My doors line up perfectly too...I moved the striker around in multiple positions but nothing has helped. Thanks. __________________ Larry 72 Cheyenne LWB Fleetside Oak Bed 350 w/ TH400 (finally complete!). 69 Chevy C-10 LWB 350 w/ TH350 (good 'ol rusty bullet proof dependable hauler). 02 Suburban Z71 4x4 (wife's driver).

06-14-2010, 12:50 AM	#13
sakid Registered User Join Date: Nov 2009 Location: Salmon Arm, BC Posts: 6	Re: door will not lock I'd love to say that I fixed it, but the truth is that it's been in my back yard for the past 6 months or so and I haven't worked on it. I looked into new mechanisms and here in canada they're worth about $65 a side, new. I figured, when I'm ready to get it done, that was pretty reasonable. Let me know how it goes if you don't mind.

06-14-2010, 12:57 AM	#14
Sillyoldman #16876 Join Date: Apr 2005 Location: Auburn WA Posts: 12,266	Re: door will not lock My ds door is the same. I never bothered to fix it. I lift on the handle while I lock it with my key. __________________ Posted via Stationary Device '71 Custom Deluxe C-20 402. '67 Buick Special 455. '49 Plymouth Special Deluxe. *"I love that old car smell"* *Some people are like Slinkies... not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.*

06-14-2010, 08:29 AM	#15
Cheyenne Supr Registered User Join Date: Dec 2003 Location: Nashville Posts: 48	Re: door will not lock Well, I kept playing around with it. I think the problem is 40 yr old worn gear locks (as several have mentioned in similar strings) combined with the new weatherstripping. By moving the strikers out slightly I was finally able to lock both doors, but I have to push in fairly hard on the doors to get them to lock. The strikers were almost all the way out already, and if I play with them too much the doors won't close properly. My guess is that new latches would improve the situation, but I'll hold off on that since I did finally get them to lock by applying pressure on the doors. Thanks for your feedback. __________________ Larry 72 Cheyenne LWB Fleetside Oak Bed 350 w/ TH400 (finally complete!). 69 Chevy C-10 LWB 350 w/ TH350 (good 'ol rusty bullet proof dependable hauler). 02 Suburban Z71 4x4 (wife's driver).



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