 Replacing trunk hinge, Success, and hinge bolt mod. |
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| Olympic 914 |
 Dec 4 2018, 02:38 PM
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#1
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 Group: Members Posts: 1,661 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States 
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Going to have to repair/replace the trunk hinge on the car this winter. It was repaired before.... but it failed in a different spot. I wonder if the trunk lid gasket was too tight and caused this failure?
I am planning on taking the engine out to make it easier to get in there and position it correctly and do a good job welding. How many of you have done this repair leaving the engine in?   I am not an experienced welder and trying to weld it while bent over the fender and trying to even get the mig in there seems too hard. I have already had the engine out twice since last Oct. so I am getting quite good at it. |
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| mepstein |
Dec 4 2018, 02:40 PM
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#2
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914-6 GT in waiting Group: Members Posts: 19,223 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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If you don’t need it to be original, Jwest makes a bolt in trunk hinge kit.
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| dr914@autoatlanta.com |
Dec 4 2018, 05:14 PM
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#3
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914 Guru Group: Members Posts: 7,811 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
engine in easy if you can spot weld, and now with McMark'd trunk hinge tool, can be retensioned easily
QUOTE(Olympic 914 @ Dec 4 2018, 01:38 PM)  Going to have to repair/replace the trunk hinge on the car this winter. It was repaired before.... but it failed in a different spot. I wonder if the trunk lid gasket was too tight and caused this failure? I am planning on taking the engine out to make it easier to get in there and position it correctly and do a good job welding. How many of you have done this repair leaving the engine in? I am not an experienced welder and trying to weld it while bent over the fender and trying to even get the mig in there seems too hard. I have already had the engine out twice since last Oct. so I am getting quite good at it. |
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| dr914@autoatlanta.com |
Dec 4 2018, 05:15 PM
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#4
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914 Guru Group: Members Posts: 7,811 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
by the way in the back of the tech tips 700 is the procedure and placement diagram
QUOTE(dr914@autoatlanta.com @ Dec 4 2018, 04:14 PM) engine in easy if you can spot weld, and now with McMark'd trunk hinge tool, can be retensioned easily QUOTE(Olympic 914 @ Dec 4 2018, 01:38 PM) Going to have to repair/replace the trunk hinge on the car this winter. It was repaired before.... but it failed in a different spot. I wonder if the trunk lid gasket was too tight and caused this failure? I am planning on taking the engine out to make it easier to get in there and position it correctly and do a good job welding. How many of you have done this repair leaving the engine in? I am not an experienced welder and trying to weld it while bent over the fender and trying to even get the mig in there seems too hard. I have already had the engine out twice since last Oct. so I am getting quite good at it. |
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| Olympic 914 |
Dec 4 2018, 05:59 PM
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#5
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Group: Members Posts: 1,661 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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QUOTE(dr914@autoatlanta.com @ Dec 4 2018, 06:15 PM) by the way in the back of the tech tips 700 is the procedure and placement diagram Just checked my copy of the 700 Tech tips and was unable to find the placement diagram..... (IMG:style_emoticons/default/confused24.gif) |
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| jcd914 |
Dec 4 2018, 06:10 PM
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#6
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
QUOTE(mepstein @ Dec 4 2018, 01:40 PM) If you don’t need it to be original, Jwest makes a bolt in trunk hinge kit. (IMG:style_emoticons/default/agree.gif) This was the method I chose. They come with backing plates so the sheet metal is clamped and the load spread out over more metal than the welded bracket. I also like that the pivot is adjustable to help fine tune the trunk lid position. Definitely not for the 'originality crowd' but a good functional solution. Jim |
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| 914werke |
Dec 4 2018, 06:34 PM
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#7
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"I got blisters on me fingers" Group: Members Posts: 9,995 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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The failure mode isn't tension, but rust. Or more precisely lack of lubrication that leads to rust. Once the shoulder bolt wears out its lube, its the beginning of the end.
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| 914_teener |
Dec 4 2018, 06:54 PM
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#8
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914 Guru Group: Members Posts: 5,193 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
QUOTE(914werke @ Dec 4 2018, 04:34 PM) The failure mode isn't tension, but rust. Or more precisely lack of lubrication that leads to rust. Once the shoulder bolt wears out its lube, its the beginning of the end. Looks like shear to me. |
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| amfab |
Dec 5 2018, 02:58 PM
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#9
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Member Group: Members Posts: 391 Joined: 17-May 16 From: Los Angeles Member No.: 20,004 Region Association: None
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+2 for the JWest system.
Hardest part was getting the old hinge bits off |
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| dr914@autoatlanta.com |
Dec 5 2018, 03:22 PM
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#10
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914 Guru Group: Members Posts: 7,811 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
the bottom of page 132
QUOTE(Olympic 914 @ Dec 4 2018, 04:59 PM) QUOTE(dr914@autoatlanta.com @ Dec 4 2018, 06:15 PM) by the way in the back of the tech tips 700 is the procedure and placement diagram Just checked my copy of the 700 Tech tips and was unable to find the placement diagram..... (IMG:style_emoticons/default/confused24.gif) |
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| Olympic 914 |
Dec 5 2018, 06:05 PM
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#11
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Group: Members Posts: 1,661 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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Damn.... My copy only goes to pg 125. (IMG:style_emoticons/default/huh.gif) (IMG:style_emoticons/default/hissyfit.gif)
QUOTE(dr914@autoatlanta.com @ Dec 5 2018, 04:22 PM) the bottom of page 132 QUOTE(Olympic 914 @ Dec 4 2018, 04:59 PM) QUOTE(dr914@autoatlanta.com @ Dec 4 2018, 06:15 PM) by the way in the back of the tech tips 700 is the procedure and placement diagram Just checked my copy of the 700 Tech tips and was unable to find the placement diagram..... (IMG:style_emoticons/default/confused24.gif) |
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| rgalla9146 |
Dec 5 2018, 08:10 PM
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#12
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Advanced Member Group: Members Posts: 4,544 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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See current thread...'Replacing bracket for hinge pillar'
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| Tdskip |
Dec 6 2018, 08:16 AM
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#13
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Advanced Member Group: Members Posts: 3,678 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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I haven't done it (yet) but I believe the JWest set up is an engine-in job.
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| Olympic 914 |
Jan 26 2019, 03:00 PM
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#14
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Group: Members Posts: 1,661 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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OK, decided to pull the engine to do this job.
Taped cardboard all around to protect the paint from grinding and welding spatter. Cut the old ones out. the best way to locate the position is to mount the hinges to the trunk lid, put it in place lining up the trunk and then put a couple spot welds on it to hold things. take it back apart and then weld it up right. After getting in there I didn't like the looks of the other hinge, So I cut them both out. and ordered new mounts form RD Got the old ones cut out.  New mounts welded in. much easier without the engine in. you can just sit on a little stool and weld away...   Didn't want this happening again, and someone else had mentioned doing a grease fitting mod to the bolts. so over the lathe for a bit to cut a grease groove, then drilled and tapped for a fitting. I also polished off all the paint on the mating surfaces with a wire wheel in the Dremel   Easy to get a grease gun in there and put a couple squirts in to keep things moving smoothly.  Kind of looks like it should be this way. |
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| 914forme |
Jan 26 2019, 06:12 PM
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#15
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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(IMG:style_emoticons/default/agree.gif) They look great, that trick was published in Pano a long time ago.
One quick question just for curiosity sake. I see you mounted the shoulder bolt in a what I am thinking was a piece of solid round that you threaded for the shoulder bolt to seat in. So not to ruin the the bolt threads by putting them in your chuck. Am I correct? |
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| Olympic 914 |
Jan 26 2019, 08:45 PM
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#16
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Group: Members Posts: 1,661 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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QUOTE(914forme @ Jan 26 2019, 07:12 PM) (IMG:style_emoticons/default/agree.gif) They look great, that trick was published in Pano a long time ago. One quick question just for curiosity sake. I see you mounted the shoulder bolt in a what I am thinking was a piece of solid round that you threaded for the shoulder bolt to seat in. So not to ruin the the bolt threads by putting them in your chuck. Am I correct? Yes, That, and giving me extra space so I didn't have to worry about crashing into the chuck. and I was able to use the same piece to cross drill the bolt with the drill press. |
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| IronHillRestorations |
Jan 26 2019, 09:04 PM
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#17
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I. I. R. C. Group: Members Posts: 6,714 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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Bingo! That's what I call the "Upfixen" mod.
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| 914forme |
Jan 26 2019, 11:04 PM
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#18
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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QUOTE(Olympic 914 @ Jan 26 2019, 09:45 PM) QUOTE(914forme @ Jan 26 2019, 07:12 PM) (IMG:style_emoticons/default/agree.gif) They look great, that trick was published in Pano a long time ago. One quick question just for curiosity sake. I see you mounted the shoulder bolt in a what I am thinking was a piece of solid round that you threaded for the shoulder bolt to seat in. So not to ruin the the bolt threads by putting them in your chuck. Am I correct? Yes, That, and giving me extra space so I didn't have to worry about crashing into the chuck. and I was able to use the same piece to cross drill the bolt with the drill press. (IMG:style_emoticons/default/agree.gif) I bought my Lathe and Mill used, and the last owner, not only ran into the chuck, but also expanded the 3 jaw to the point it hit the bed, and cross slide. (IMG:style_emoticons/default/WTF.gif) I could never get the chuck to center properly. New 4 Jaw solved the issue. Tonight I was thinking about a new bed, and cross slide. |
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| windforfun |
Jan 27 2019, 11:23 AM
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#19
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Senior Member Group: Members Posts: 1,771 Joined: 17-December 07 From: Blackhawk, CA Member No.: 8,476 Region Association: None |
I replaced my plastic rollers with metal ones. I think I got them from AA. FYI. Nice work BTW.
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| second wind |
Jan 27 2019, 01:44 PM
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#20
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Senior Member Group: Members Posts: 847 Joined: 30-December 10 From: Los Angeles, California Member No.: 12,543 Region Association: Southern California
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QUOTE(Olympic 914 @ Jan 26 2019, 01:00 PM) OK, decided to pull the engine to do this job. Taped cardboard all around to protect the paint from grinding and welding spatter. Cut the old ones out. the best way to locate the position is to mount the hinges to the trunk lid, put it in place lining up the trunk and then put a couple spot welds on it to hold things. take it back apart and then weld it up right. After getting in there I didn't like the looks of the other hinge, So I cut them both out. and ordered new mounts form RD Got the old ones cut out. New mounts welded in. much easier without the engine in. you can just sit on a little stool and weld away... So.....any chance you could make a batch of those nifty bolts and bless us other guys? Thank you. gg Didn't want this happening again, and someone else had mentioned doing a grease fitting mod to the bolts. so over the lathe for a bit to cut a grease groove, then drilled and tapped for a fitting. I also polished off all the paint on the mating surfaces with a wire wheel in the Dremel Easy to get a grease gun in there and put a couple squirts in to keep things moving smoothly. Kind of looks like it should be this way. |
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