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Joined: Jun 2009
Posts: 89 Likes: 1
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jun 2009
Posts: 89 Likes: 1 |
I am installing a newly rebuilt 3rd arm in a 54 passenger car. I noted that there are special bolts specified for attaching the assembly to the chassis. The parts book identifies the bolts as part number 217208 with an asterisk. In the footnotes the asterisk denotes a bolt made of "special steel". Am I wrong to interpret this as a grade 8 bolt or would it be a bolt of an entirely different metallurgy? What say you Gene?
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
I woud feel safe with a grade 8. IF I REMMBER CORRECTLY THE ORIGINAL BOLT HAD A LOWER HEAD..
Gene Schneider
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Joined: Dec 2007
Posts: 4,024 Likes: 99
ChatMaster - 4,000
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ChatMaster - 4,000
Joined: Dec 2007
Posts: 4,024 Likes: 99 |
I agree with Gene. A Grade 8 bolt will be more than adequate.
In the time period when these classic cars were designed and manufactured most hardware was not heat treated. Special bolts were made of medium carbon steel and heat treated to perform similar to what we now call Grade 5. There might have been a few situations where they were heat treated to Grade 8 strength.
If the joint uses washers and nuts make sure you get matching Grade 8 hardware.
If the shop manual has a torque value for that joint use that value. You could damage the mating parts if you create too much clamp force.
Rusty
VCCA #44680
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Joined: Jun 2009
Posts: 89 Likes: 1
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jun 2009
Posts: 89 Likes: 1 |
Thanks to both Gene and Rusty. I'll follow your advice and I will also check to see if there is any difference in the hight of the bolt heads between the ones I removed and a grade 8 replacement. Hopefully the the ones I removed were originally the car.
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Joined: Apr 2011
Posts: 116
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Apr 2011
Posts: 116 |
Just use grade 8 the large bolt under the engine is a @itch to get at and replace use the old one because it is very short and would be hard to duplicate,I believe.
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