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  1. #1
    Join Date
    Jun 2010
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    Birmingham Alabama
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    Default Hood pops up when driving

    Two times in the past week when I drove the Roadmaster the hood has popped open upon hitting a bump. Thankfully the safety latch prevented a disaster.
    I'm afraid to drive it more, before I can find a solution.

    Here's what I've done, am doing about it.

    I've found a used lower hood latch assembly for sale on Ebay. I have not purchased it. But, I have inquired on the price of shipping.

    I tried running the hood 'bayonet' bolt farther out.
    But, that only made the hood loose.
    So, I adjusted the bolt back up to bring the hood back down, tight.

    I've not been successful recreating the problem standing in front of the car. But, I can recreate it by driving over a bump, the hood will pop open, the safety catch is the only thing preventing it from opening completely (very unnerving!)

    I read the shop manual and today I'm going to try to adjust the lower assembly laterally, (toward the passenger side) hoping to give more surface contact between the lower latch and the upper 'bayonet' bolt.

    Any words of wisdom, tales of experience, advice, thoughts, are most welcome.

    Thanks,
    "Bulldog" James A. Miller

  2. #2
    Join Date
    Aug 2006
    Location
    MD and FL
    Posts
    718

    Default Re: Hood pops up when driving

    Think you're on right track w/lateral adj...however, another possibility is deteriorating/collapsing core support rubber mounts...allowing ft end sheet metal to move enough to trip release...
    John

    '71 GS 455 Convertible (1 of 219)..."Honolulu Lulu"...selling dealer/Jan & Dean homage
    '87 GN (1 of 20,193)...they all look alike...and are stock
    '04 GMC Sierra Denali (1 of 2662)...loaded AWD Quadrasteer work truck...yeah, right
    '66 BSA A65L...in a million pieces...so many interests, so little time

    BCA 41691, B.O.O.M. 228
    GSCA 2406
    BPG 1933

  3. #3
    Join Date
    Dec 2002
    Location
    St. Charles, MO
    Posts
    16,076

    Default Re: Hood pops up when driving

    Make sure the primary latch is well lubed with something like lithium grease. It may not be engaging all the way due to corrosion or lack of lubrication.
    Adam Martin
    BPG# 1358
    BCA# 39765
    1960 Buick Electra225 Convertible
    www.buickperformancegroup.com
    www.buickpartsdirectory.com
    www.buickcenturion.com
    www.antiqueautomotiveservice.com

    http://www.antiqueautomotiveservice.com/images/logo_top.gif

  4. #4
    Join Date
    Oct 2010
    Posts
    230

    Smile Re: Hood pops up when driving

    Quote Originally Posted by bhambulldog View Post
    Two times in the past week when I drove the Roadmaster the hood has popped open upon hitting a bump. Thankfully the safety latch prevented a disaster.
    I'm afraid to drive it more, before I can find a solution.

    Here's what I've done, am doing about it.

    I've found a used lower hood latch assembly for sale on Ebay. I have not purchased it. But, I have inquired on the price of shipping.

    I tried running the hood 'bayonet' bolt farther out.
    But, that only made the hood loose.
    So, I adjusted the bolt back up to bring the hood back down, tight.

    I've not been successful recreating the problem standing in front of the car. But, I can recreate it by driving over a bump, the hood will pop open, the safety catch is the only thing preventing it from opening completely (very unnerving!)

    I read the shop manual and today I'm going to try to adjust the lower assembly laterally, (toward the passenger side) hoping to give more surface contact between the lower latch and the upper 'bayonet' bolt.

    Any words of wisdom, tales of experience, advice, thoughts, are most welcome.

    Thanks,
    Bham I had the same problem my body guy was able ot fix it be adjusting the primary locking mech ,took a far bit of time but he got it. i tried to adjust it my self and ending up having the hood locked up to where i could not get it opened, that's when i took it to him for a fix.

  5. #5
    Join Date
    Jun 2010
    Location
    Birmingham Alabama
    Posts
    9,720

    Default Re: Hood pops up when driving

    Quote Originally Posted by dynaflow View Post
    Think you're on right track w/lateral adj...however, another possibility is deteriorating/collapsing core support rubber mounts...allowing ft end sheet metal to move enough to trip release...
    Thanks John
    I believe that may be the case. Each time the hood popped open it was after a hitting a hard bump. I was taking a close look at the hood bumpers just now and can see the sheet metal of the core support around the bumpers has been dimpled. After seeing that, I'm thinking issues with the fender and core mounts, just as you say. I have new hood bumpers. But, as far as I know the core mounts are 56 years old.

    I've been contemplating removing the fenders to replace the portholes, and replace the ducting, piping and heater core of the defroster. And, detail the engine properly.
    Now may be a good time to look at the Steele Rubber catalog.........

    I tried about three different positions of the upper latch bolt. Realizing that, lengthening raises the closed hood position. And, shortening lowers the closed hood position. At one trial position I removed two shims each from the four hood bumpers on the core support. But, this caused a bad looking fit between the hood and the mustache bar. Eventually, I got the closed hood to a position that looks right.

    After a couple of trial positions; I now have the lower latch assembly as far to the passenger side as the slotted holes allow.

    I'm not sure if any of this will keep the hood closed, however. I'm beginning to believe that the small spring at the rear of the lower latch is the culprit. I'm suspecting, that small spring is not creating enough tension to keep the lower latch in place when the hood is down.

    In the mean time. I'm thinking of what can I do to keep the hood down? Maybe a cable or chain with a bolt or pad lock? I mean just until I can find out what parts I need and a definite plan of action. (?)

    Quote Originally Posted by Smartin View Post
    Make sure the primary latch is well lubed with something like lithium grease. It may not be engaging all the way due to corrosion or lack of lubrication.
    Thanks Adam,
    very good advice.
    I failed to list that action on this thread, as I lube the hood springs, hinges and latch regularly. We had a Super parts car that the hood folded double due to no grease. I've been a nut about keeping the hood hinges and latch greased since then.
    "Bulldog" James A. Miller

  6. #6
    Join Date
    Jun 2010
    Location
    Birmingham Alabama
    Posts
    9,720

    Default Re: Hood pops up when driving

    Quote Originally Posted by nineteenfifty5 View Post
    Bham I had the same problem my body guy was able ot fix it be adjusting the primary locking mech ,took a far bit of time but he got it. i tried to adjust it my self and ending up having the hood locked up to where i could not get it opened, that's when i took it to him for a fix.
    Thanks fifty5

    35 years Dad and I had the hood off. Getting the hood back on and adjusted was a real bear!
    We had it re-painted ten years ago. The body and paint guy fixed the hood, that time (that body shop has since closed ).
    For ten years, the hood been working beautifully! ........ Until two weeks ago tomorrow.

    I just came inside form monkeying around with it. I'm not sure if I've made a difference or not. When I drive it, If the hood comes up; I'll know I didn't. If, the hood does not come up while driving, I'll be wondering when it will pop up!!

    I think a good body man is what I need. This winter may be the time.......

    Right now; I'm going to eat some lunch and drink a beer.
    "Bulldog" James A. Miller

  7. #7
    Join Date
    Aug 2009
    Location
    fort lauderdale, florida
    Posts
    2,198

    Default Re: Hood pops up when driving

    DRIVE SLOWER! NAAH THAT CAN'T BE IT......


    Scott
    __________________________________________
    66 Buick Skylark ('70 GS 350-4 motor, TH350, 3:36 rear, more to come later)
    __________________________________________
    Scott

  8. #8
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    Jun 2010
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    Birmingham Alabama
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    Default Re: Hood pops up when driving

    Quote Originally Posted by scott kerns View Post
    DRIVE SLOWER! NAAH THAT CAN'T BE IT......


    Scott
    Come'on man! It's a NAILHEAD!!!
    "Bulldog" James A. Miller

  9. #9
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    Jun 2010
    Location
    Birmingham Alabama
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    Default Re: Hood pops up when driving

    There's an old fashioned hardware store right down in town here. I think I'll go get some newer springs to replace these on the latch assembly.
    Here's some pictures;








    "Bulldog" James A. Miller

  10. #10
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    Birmingham Alabama
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    Default Re: Hood pops up when driving

    I've got the latch too far over! The driver's side of the hood has about a 1/4" gap. And, the passenger's side of the hood has a 1/32" gap.

    I'll get some new springs and and move it back towards the center.........
    "Bulldog" James A. Miller

  11. #11
    Join Date
    Aug 2006
    Location
    MD and FL
    Posts
    718

    Default Re: Hood pops up when driving

    Latch springs look OK. Any wear on plunger where it contacts latch...maybe rotate plunger quarter turn or so to present new contact surface. How about contact edge of latch...worn back? Maybe tighten core support mount bolts...I'm still thinking sheet metal shake...
    John

    '71 GS 455 Convertible (1 of 219)..."Honolulu Lulu"...selling dealer/Jan & Dean homage
    '87 GN (1 of 20,193)...they all look alike...and are stock
    '04 GMC Sierra Denali (1 of 2662)...loaded AWD Quadrasteer work truck...yeah, right
    '66 BSA A65L...in a million pieces...so many interests, so little time

    BCA 41691, B.O.O.M. 228
    GSCA 2406
    BPG 1933

  12. #12
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    Birmingham Alabama
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    Default Re: Hood pops up when driving

    Quote Originally Posted by dynaflow View Post
    Latch springs look OK. Any wear on plunger where it contacts latch...maybe rotate plunger quarter turn or so to present new contact surface. How about contact edge of latch...worn back? Maybe tighten core support mount bolts...I'm still thinking sheet metal shake...
    I rotated the plunger to several different positions. The latch is not worn. But, there is some play. And, there is not much resistance from the srings when pushing on the latch.
    I agree on the sheet metal shake. Last couple of times I drove it I heard some squeaking I haven't heard before...........
    I'll look at it further Saturday.
    "Bulldog" James A. Miller

  13. #13
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    Aug 2006
    Location
    MD and FL
    Posts
    718

    Default Re: Hood pops up when driving

    Quote Originally Posted by bhambulldog View Post
    ...there is some play. And, there is not much resistance from the srings when pushing on the latch...
    ...could be spring(s) then...hopefully you can find good replacements (tension)...
    John

    '71 GS 455 Convertible (1 of 219)..."Honolulu Lulu"...selling dealer/Jan & Dean homage
    '87 GN (1 of 20,193)...they all look alike...and are stock
    '04 GMC Sierra Denali (1 of 2662)...loaded AWD Quadrasteer work truck...yeah, right
    '66 BSA A65L...in a million pieces...so many interests, so little time

    BCA 41691, B.O.O.M. 228
    GSCA 2406
    BPG 1933

  14. #14
    Join Date
    Jan 2004
    Location
    Lawrenceburg, Tn.
    Posts
    7,117

    Default Re: Hood pops up when driving

    Looks like the whole shebang needs to be removed , sand blasted, and repainted, and lubed up ... then reinstalled and adjusted.....
    Doc "Widely unknown"

  15. #15
    Join Date
    Mar 2006
    Location
    Southern Wisconsin
    Posts
    3,719

    Default Re: Hood pops up when driving

    While I'm not specifically familiar with the old Roadmaster, I don't think the springs are going to be the problem. GM designed that latch and those springs to specific specifications. Maybe it's just me but I would be leary that hardware store springs would live up to those specs. The springs don't actually hold anything as far as keeping the hood down, they only help the various moving parts on the mechanism return to their positions after performing their function. My vote goes to making sure everything is well lubed and adjusted.

    For whatever the reason the latch is not completeing it's full function when you close it. Not having it front of me makes it more difficult to figure out but I would start by removing and latch assembly, remove the springs, and make sure the latch itself is functioning properly or if it's sticking somewhere. If it is, fix it or replace it, then reinstall the springs. Next I would make sure when you close it that it does everything it's supposed to do. What I mean by that is you should hear at least a double click when it closes, one for the safety latch and one for the final position. Once you get that, adjust the hood or latch so it fits tight. Like I said, I'm not specifically familiar with the old Roadmaster but I have been around this stuff a good share of my life and always felt that a person should start a repair by having a complete understanding of how it works before starting on it, it makes the repair go a lot easier. A little tip that might help you when it comes to adjusting things..... I always use masking tape for marking. Place a piece of tape along one side of the latch so when you make an adjustment you can see how far and which direction you've moved it. I even mark centers or outside edges on the tape when adjusting doors, hoods, deck lids, etc. It goes a lot easier and you will know what works and what doesn't. It bascially takes a lot of the guess work out of it. Hope this helps.
    Bill

  16. #16
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    Lawrenceburg, Tn.
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    Default Re: Hood pops up when driving

    Yep, what Bill says.....
    Doc "Widely unknown"

  17. #17
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    Default Re: Hood pops up when driving

    Thanks everyone!

    I'm going to work on it Saturday.
    "Bulldog" James A. Miller

  18. #18
    Join Date
    Sep 2010
    Location
    Salt Lake City, Utah
    Posts
    774

    Default Re: Hood pops up when driving

    Did you get it to work? I'm guessing good old fashion cleaning, some grease and a big hammer.
    Last edited by LowFlyLark; 11-06-2011 at 07:42 PM.
    Brian R.

    Low Flying 1964 Skylark, 355 Wildcat, 200 4R. My build link... http://www.v8buick.com/showthread.php?t=213961



    My great cars that got away;
    Totaled 67 Camaro SS RS 350 4 speed.
    69 Camaro RS Convert. Scored 96 out of 100. Investor talked me out of it, it's been collecting dust every since.
    63 Lemans conv, white with red int, rare side skirts, low mile original, also collecting dust in a private collection.

  19. #19
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    Jun 2010
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    Birmingham Alabama
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    Default Re: Hood pops up when driving

    No. I had a minor medical procedure today.
    I've looked at one on ebay. I clicked on the buy it now button. Then I get a message that my pay pal has been frozen! (?) I don't know what that's about. Looks like it will be next Saturday before I can get any thing else done on it......
    Looking around on the HAMB, AACA it seems this is a common problem for 53-56 Buicks. But, this is my first experience with it.
    "Bulldog" James A. Miller

  20. #20
    Join Date
    Apr 2010
    Location
    Norhtern Kentucky, by way of TEXAS
    Posts
    15

    Default Re: Hood pops up when driving

    I had this same problem, I adjusted parts for hours, then I decided to retrieve the hood latch off a parts car I have. After comparing the two, I noticed the inside part of the lower latch was bent. I replaced latch with the one off the parts car and problem solved.

  21. #21
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    Default Re: Hood pops up when driving

    Quote Originally Posted by kcbowden View Post
    I had this same problem, I adjusted parts for hours, then I decided to retrieve the hood latch off a parts car I have. After comparing the two, I noticed the inside part of the lower latch was bent. I replaced latch with the one off the parts car and problem solved.
    I've took mine out and upon close inspection,.. it appears bent ever so slightly.
    "Bulldog" James A. Miller

  22. #22
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    Apr 2010
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    Norhtern Kentucky, by way of TEXAS
    Posts
    15

    Default Re: Hood pops up when driving

    Yep, that'll do it. The lock lever needs to clear the hole completely, and I guess because it didn't at one time it got bent. Good Luck!

  23. #23
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    Default Re: Hood pops up when driving

    Quote Originally Posted by LowFlyLark View Post
    Did you get it to work? I'm guessing good old fashion cleaning, some grease and a big hammer.
    big hammer might straighten it out. But, will it make the metal weak and likely to bend again? Reckon, I should heat it up after I straighten it? (re-temper?)
    Quote Originally Posted by kcbowden View Post
    Yep, that'll do it. The lock lever needs to clear the hole completely, and I guess because it didn't at one time it got bent. Good Luck!
    The lever and the latch are held together with rivets. Reckon, I have a chance of getting it back together if, I take it apart?
    "Bulldog" James A. Miller

  24. #24
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    Default Re: Hood pops up when driving

    I sure would like to have a spare on hand before I start beating on the only one I've got.
    "Bulldog" James A. Miller

  25. #25
    Join Date
    Sep 2010
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    Salt Lake City, Utah
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    774

    Default Re: Hood pops up when driving

    Rivets. Love em and hate em. Not the most fun to take apart and put back together to look factory.

    My vote... pull it apart, smash it flat and don't worry about the temper.
    Brian R.

    Low Flying 1964 Skylark, 355 Wildcat, 200 4R. My build link... http://www.v8buick.com/showthread.php?t=213961



    My great cars that got away;
    Totaled 67 Camaro SS RS 350 4 speed.
    69 Camaro RS Convert. Scored 96 out of 100. Investor talked me out of it, it's been collecting dust every since.
    63 Lemans conv, white with red int, rare side skirts, low mile original, also collecting dust in a private collection.

 

 
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