Arp Bolt Washers... - Team Camaro Tech
Tech 2002 General Tech questions from 2002
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post #1 of 5 (permalink) Old Jun 23rd, 02, 05:41 AM Thread Starter
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Join Date: May 2001
Location: Mass
Posts: 252
As some of you have been following along..I just completed a head change and am now second guessing my self about certain things...Here is another thing that is driving me crazy..The ARP head bolt washers are concave on one side and now read they should be placed the round side up(ARP never mentions this..Read it at felpros site)...Now I am not sure if I put them all in with the round side up..Anyone know if this is going to make a difference..Thanks

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post #2 of 5 (permalink) Old Jun 23rd, 02, 08:47 AM
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Tony
 
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Yes it will make a difference. The concave side of the washer fits against the radius of the bolt head where it meets the bolt shank (for stregth). If the square inside diameter is against the bolt head it can bind and stress the bolt into early failure. This is a proven method with the aviation industry as all stressed bolts are made this way. That is why the washer's are called AN Washers (just like braided line fittings).
Sometimes you can tell if the washers are installed incorrectly by looking for a gap between the bolt head and the washer. But this is not a fool proof method. There is only one way to be 100% positive about the correct installation if there has been doubt. Take them out and check.

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post #3 of 5 (permalink) Old Jun 23rd, 02, 08:14 PM
SY1
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Dave
 
Join Date: May 2001
Location: Michigan
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Tony is right. They can only be installed with the chamfered side of washer towards the radius of the bolt where the shank meets the bolt head. Goodyear Braking Systems makes washers with both sides of the inner diameter chamfered for aviation applications to prevent improper installation, it's too bad ARP didn't do this as well.

You'll have to take them out and make sure they are installed correctly. You will want to inspect the radius area of each bolt as well to make sure you haven't scored it. If you have replace the bolts as well.

Dave
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post #4 of 5 (permalink) Old Jun 24th, 02, 04:05 PM Thread Starter
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Thanks for the info guys..Took the bolts out one at a time and retorqued..They were all correct..Go figure...Thanks

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post #5 of 5 (permalink) Old Jun 24th, 02, 04:37 PM
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joe
 
Join Date: Oct 1999
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I had another problem with ARP head bolts. The washer and bolt head stuck up so high they hit my header flange. (on the lower head bolts) The interference was just enough so you could not get the header bolts in. I didn't like the small head of the ARP bolts anyway so I changed them for a set of original style bolts with correct markings.
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