ARP Main Bolt Washers

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6

69Chrgr

Charger/Cuda
Joined
Jan 29, 2007
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Just reading a CarCraft magazine and noticed an article about the chamfer on the washer that goes under the head of the main bolt. I put my chamfer facing down, away from the bolt head, however the article states the chamfer faces the head of the bolt. Do I need to recheck this before the engine goes back in the car?
 
Good question! I thought there must be a reason why it has the beveled edge. When I installed mine I installed the bevel up towards the bolt head, logic being there's more area clamping down. Who knows if that's even close to the reason.

I hope someone who knows can chime in here... Now I'm curious too. :-s
 
ARP bolts usually have a nice radius from the bolt head to the shank. I believe the bevel is accomodate that. If they are on the other way the washer might not be sitting flat against the underside of the head like it should,
 
With the sharp edge of the washer against the radius under the head of the bolt you could be causing a stress riser that may cause the bolt to fail. What is the probability of this happening? Don't really know but it's like a small.

If it were me I would pull each bolt one at a time an flip the washer then torque the bolt to just below the final number. Once all are done go over the bolts in the proper sequence to bring them to the specified torque.
 
What DGC said... They are avoiding stress risers at the bolt's weakest point. I dont think the blot has a big radius there. At least not big enough to hit a square cut edge. I also dont think that's too much of a concern in most applications, but if it was mine, I'd go back and correct it...lol. At least you caught it.
 
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