S197 3V Racing Harness installation (6 pt)

[BKBoss302]

Three points I see. First, get the cotter pins installed in the snap locks on the harness ends.
Second, the wrap on the sub belt buckles isn't correct. It should be the same as the shoulder harness wrap.
View attachment 73973
Another method is this one:
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Third, you may need to cross the straps for proper HANS/FHR use depending on how far back the harness bar is from the seat back. Here's some details from Schroth on the crossover question from these instructions :

https://www.hmsmotorsport.com/doc-share/ea_8-2_2019-04.pdf

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Good on you for asking the question. I catch a dozen harness installs with deficiencies each year in our local club.

Thanks Cornerz!!
Great advice on the details - didn't even know the cotter pins were used in that clip. Points 1 and 2 are easily corrected.
For the shoulder belt spacing I did some measuring and determined that I am 15 inches from the bar to the center of my shoulder with my FHR on. My FHR is 7 inches wide so by the bottom chart on page 9 I should be at 3 inch spacing with the belts not in a crossover. Is that how to read that? I am using 2 inch wide belts so I should be 1 inch narrower so 2 inches would be the belt spacing according to the note on page 8.

 

[Cornerz]

Thanks Cornerz!!
Great advice on the details - didn't even know the cotter pins were used in that clip. Points 1 and 2 are easily corrected.
For the shoulder belt spacing I did some measuring and determined that I am 15 inches from the bar to the center of my shoulder with my FHR on. My FHR is 7 inches wide so by the bottom chart on page 9 I should be at 3 inch spacing with the belts not in a crossover. Is that how to read that? I am using 2 inch wide belts so I should be 1 inch narrower so 2 inches would be the belt spacing according to the note on page 8.

View attachment 74023

View attachment 74024

Yes, that’s how I would fit those measurements into the table. One other observation from your new pics - the anti sub belts may need to be shorter to keep the shoulder belts from pulling the lap belts out of your iliac crest. They should take a slight dip downwards when done up tight before the shoulder straps go on. And of course, don’t forget to do up your helmet. lol.

I jest of course about the helmet strap from your pics, but I’ve sent many a driver back to the paddock for helmets not done up, or the HANS on top of the harnesses, or any number of silly reasons that get missed in their excitement. As a result, any time I see pics of a race car interior, my eyes get drawn to the safety gear use and install first before I even know what type of car it is. It’s a bit of a curse and a blessing at the same time.

 

[BKBoss302]

Yes, that’s how I would fit those measurements into the table. One other observation from your new pics - the anti sub belts may need to be shorter to keep the shoulder belts from pulling the lap belts out of your iliac crest. They should take a slight dip downwards when done up tight before the shoulder straps go on. And of course, don’t forget to do up your helmet. lol.

I jest of course about the helmet strap from your pics, but I’ve sent many a driver back to the paddock for helmets not done up, or the HANS on top of the harnesses, or any number of silly reasons that get missed in their excitement. As a result, any time I see pics of a race car interior, my eyes get drawn to the safety gear use and install first before I even know what type of car it is. It’s a bit of a curse and a blessing at the same time.

Thanks again for all the great tips. I was thinking those lap belts were up a bit high. I really appreciate the safety aspects of these projects so I will be making these adjustments as I prepare for the track day season.

 

[Bill Pemberton]

Solid advice from the Maritimes of Canada, Cornerz is spot on concerning the belts and it goes to show, one will get solid advice on TMO from all over the Globe!!

 

[302FAM]

Yes, that’s how I would fit those measurements into the table. One other observation from your new pics - the anti sub belts may need to be shorter to keep the shoulder belts from pulling the lap belts out of your iliac crest. They should take a slight dip downwards when done up tight before the shoulder straps go on. And of course, don’t forget to do up your helmet. lol.

I found this chart to be enlightening as well, look at the torque specs for 7/16” bolts - am I reading that right, 30 lbft?!

 

[Cornerz]

I found this chart to be enlightening as well, look at the torque specs for 7/16” bolts - am I reading that right, 30 lbft?!

View attachment 74069

Yep. The goal of fastener torque is just to keep it from vibrating out. Nordlock washers are ideal for this, especially when used with thread locker. You’ll notice elsewhere in the instructions that ideally the bolts should be installed in shear vice in tension. So for an eyelet, the direction of force on the harness would bend the fastener instead on pulling directly against the threads.

 

[302FAM]

Yep. The goal of fastener torque is just to keep it from vibrating out. Nordlock washers are ideal for this, especially when used with thread locker. You’ll notice elsewhere in the instructions that ideally the bolts should be installed in shear vice in tension. So for an eyelet, the direction of force on the harness would bend the fastener instead on pulling directly against the threads.

Yeah, I saw that directional section for the eyelets as well - all very helpful guys, appreciate your expertise Cornerz and attention to detail from you and BKBoss!!