 Torsion bar bolt, Replacement procedure |
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| NARP74 |
 Aug 16 2023, 11:47 AM
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#1
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Senior Member  Group: Members Posts: 1,063 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains  |
One of my front torsion bar bolts was replaced with a normal bolt. I am going to get a replacement like below. What is the replacement procedure?
Wheels off the ground? Count turns of the bolt? Measure something? Any tension to worry about? https://pmbperformance.com/products/torsion...ff135&_ss=r |
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| mepstein |
Aug 16 2023, 12:40 PM
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#2
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914-6 GT in waiting Group: Members Posts: 19,271 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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Jack it up, replace, get close to what you think it needs, drive it around the block, readjust until you are happy.
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| brant |
Aug 16 2023, 01:34 PM
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#3
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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I’d mark the bolt with a sharpie and count the rotations. Maybe measure ride height at that corner to the front chassis before removal
Try to maintain ride height or your changing alignment slightly |
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| technicalninja |
Aug 16 2023, 03:35 PM
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#4
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Senior Member Group: Members Posts: 1,217 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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"Count the turns" may not work properly with a non-original bolt.
Measure ride height and re-create same measurement is how I'd skin that cat. Drive around and adjust is also good advice and then "have an alignment done" is also a reasonable suggestion. Adjusting front ride height on an old rusty 70 914 is how I first learned about blood poisoning. (IMG:style_emoticons/default/sad.gif) Makes all the veins/arteries stand out like a road map on your arm... |
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| Front yard mechanic |
Aug 16 2023, 05:03 PM
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#5
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Senior Member Group: Members Posts: 1,162 Joined: 23-July 15 From: New Mexico Member No.: 18,984 Region Association: None
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Wheels off the ground makes it easier to see and turn the bolts. Drop the jack bounce a couple of times and measure the inside of the fenders to the ground. Go for a run and readjust
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| bkrantz |
Aug 16 2023, 08:40 PM
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#6
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914 Guru Group: Members Posts: 7,763 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
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Best practice is to check corner weights. Adjust the torsion bars first to get the ride height you want, and then balance the weight totals for front left plus rear right with front right and rear left. Raising the ride height on a front corner slightly makes it carry more weight. Each diagonal total should carry 50% of the total car weight.
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| targa72e |
Aug 16 2023, 10:17 PM
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#7
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Member Group: Members Posts: 262 Joined: 11-September 16 From: colorado Member No.: 20,392 Region Association: None
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I am with others, measuring fender height is probably the best way to get it back to same place. The threads of the bolts will be the same but the contact point to the adjuster might be different between bolts. It doesn't take much difference at the bolt to make a big difference in height. Long term when you have all the suspension sorted a corner balance and alignment is the final step to best handling.
john |
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| Geezer914 |
Aug 17 2023, 04:22 AM
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#8
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Geezer914 Group: Members Posts: 1,412 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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It is better to measure the ride height from the center of the torsion bar caps.
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| jim_hoyland |
Aug 17 2023, 08:48 PM
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#9
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Get that VIN ? Group: Members Posts: 9,296 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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PMB has several other related parts…
Attached thumbnail(s) 
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| brant |
Aug 18 2023, 11:10 AM
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#10
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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QUOTE(Geezer914 @ Aug 17 2023, 04:22 AM)  It is better to measure the ride height from the center of the torsion bar caps. I like to measure from a chassis point and not the fender that is dependent on spring and shock I have an aluminum cross member and like to use that flat spot on it as a repeatable measurement. brant |
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| jim_hoyland |
Aug 19 2023, 07:59 PM
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#11
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Get that VIN ? Group: Members Posts: 9,296 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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Any possibility of breaking the old bolt while backing it out ? Kinda rusty…
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| jim_hoyland |
Sep 8 2023, 06:38 PM
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#12
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Get that VIN ? Group: Members Posts: 9,296 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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Received the two PMB replacement bolts today. Is there anything Elsie to check while under the car ?
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