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  #31  
Old 10-23-2005, 12:30 AM
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Quote:
Originally Posted by t walgamuth
on brake calipers you insist on sticking to the book.

on these necked bolts now suddenly because you havent seen the spec on diameter, you suddenly decide your opinion based on nothing holds sway!

i am having a little trouble seeing consistancy here.

tom w
All I mentioned to you is that I was not aware of any spec that allowed you to measure the diameter of the bolts to determine whether to use them or not. If such a spec exists, and it can be reliably used, then I stand corrected.

However, my professional opinion is that the variation in the diameter of a mass produced bolt might be more than the specification for which you are seeking. If the length of the bolt changes by 2 mm, the diameter is going to change a very small fraction of this value........maybe .003" or so. I have a difficult time believing that a typical head bolt is manufactured to a tolerance of .001". This would be necessary if you are seeking to use .003" as the go/no go specification.

Naturally, I have no data.........so..........I'm admittedly just speculating.

If your machinist has the data, and the bolts are manufactured to the tolerances required, then he's more than welcome to use it. But, I remain skeptical of this approach.

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  #32  
Old 10-23-2005, 12:06 PM
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So, if the proper way to measure these bolts is by diameter/shank who has seen the specs on this method? Maybe TimFreeh can look it up in his book?
Thanks,
Matt
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  #33  
Old 10-23-2005, 03:38 PM
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I didn't mean it's the proper way in this case. In general engineering practice a torque-to-yield bolt has a measurment point along the shank and a corresponding spec. If the 603 bolts are any indication, there's another way to measure these bolts.

Sixto
87 300SDL
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  #34  
Old 10-24-2005, 01:23 AM
t walgamuth's Avatar
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see fsm for 617.95 engine

section 03.310 complete with illustration of a caliper measuring the neck on a rod cap bolt.

the head bolts specify to measure the length. so it is done both ways.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #35  
Old 10-24-2005, 01:25 AM
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You're supposed to add a Latin phrase after a statement like that to seal your credibility

Sixto
87 300SDL
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  #36  
Old 10-24-2005, 09:11 AM
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Quote:
Originally Posted by t walgamuth
section 03.310 complete with illustration of a caliper measuring the neck on a rod cap bolt.

the head bolts specify to measure the length. so it is done both ways.

tom w
If he is measuring the head bolts for diameter, how about posting the specs that he is using. Also, please comment where he found these specs. Everything that I have on the 617 and 603 shows specifications for length.
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  #37  
Old 10-24-2005, 09:16 AM
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i never stated

that my machinist was measuring head bolts. i was referring to stretch bolts in general.

i can see how you may have interpreted it that i was making a specific statement, though.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #38  
Old 10-24-2005, 09:22 AM
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Quote:
Originally Posted by t walgamuth
I thought I have seen my machinist measure the diameter of the bolts to see if they meet the spec.

tom w

The topic of the thread was head bolts. Was this not what he was measuring??
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  #39  
Old 10-24-2005, 09:42 AM
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dont remember

just remember that they were stretch bolts. might not have been benz even.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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