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Old 05-13-2004, 08:53 AM
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Problem with new rod bolts...

I have a question for you machinist types out there ...when I rebuilt the rods I normally replace the stock rod bolts with ARP bolts. But I notice a problem when I get the rods back, the new bolts are not in straight! They are either pigeon toed or splayed out ("y" shaped). This makes removing the rod cap a pain ...and forget trying to get a accurate reading with plastic-gage. Now this has happened to me 3 times now and not with the same machinist. The last two times I've went back and talked with them and they don't know what cause the problem, but quickly say that it really doesn't matter because the ends are machined with the caps torqued on, so once the rod is installed everything will be right. Well this rubs me the wrong way ...first rule of engine building is to check EVERYTHING! ...And not being able to check the journals with plastic gage just spoils my day. So far I've been lucky and the rods have worked out. But I'd like to understand the problem for the machinist view point. Anybody have some thoughts on this subject? THX! ...Mark

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Old 05-13-2004, 09:06 AM
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rods

Are they like this in every rod??? I would question the shop where you are taking the stuff if all the rods are like this.

A few things,
If the rod has had a spun bearing this will sometimes cause the rod to distort due to the heat. I always chuck the rod when this happens.

The arp bolts have a radius under the head of the bolt. Care needs to be taken to make sure that the rod has enough of a chamfer on it so the head of the bolt seats against the rod correctly.

Keith
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Old 05-13-2004, 09:15 AM
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Are the bolts installed by hammering them in (the wrong way) or by pressing them in (the right way)? If they are wave-lock bolts and they are hammered in, the rod will distort because the wave lock bolts go in very tight. We use a fixture to install (press in) rod bolts and don't have this problem. Careless removal of the old rod bolts could be a factor also.
tom

Last edited by machine shop tom; 05-13-2004 at 09:41 AM.
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Old 05-13-2004, 09:20 AM
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k-star ...Yup, pretty much every rod! ...to some degree or another, not sure what's happening. ...Mark
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Old 05-13-2004, 09:39 AM
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BOLTS

Read tom's post for the answer.

Tom have you noticed that the standard arp bolts will do this if hammered??? since i switched to pressing them in i have had no problems anymore.

Keith
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Old 05-13-2004, 09:43 AM
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Re: BOLTS

Quote:
Originally posted by k-star
Read tom's post for the answer.

Tom have you noticed that the standard arp bolts will do this if hammered??? since i switched to pressing them in i have had no problems anymore.

Keith
Don't know for sure, haven't hammered any in.

tom
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Old 05-13-2004, 12:33 PM
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do you still need to have the rods re-sized after pressing them in?
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Old 05-13-2004, 12:47 PM
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Quote:
Originally posted by bullheimer
do you still need to have the rods re-sized after pressing them in?
YOU BETCHA!!!

tom
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Old 05-13-2004, 02:07 PM
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These 2 shop are professional operations, been in business a number of years in this area. I didn't see them install the rod bolts, but don't see any sign of them being "beat'n in" so I have to give them the benefit of the doubt here. I was wondering just because you press these bolts in does that automatically mean they go in straight? ...I'm guessing obvious not, ...SO is there any other "tricks" in this operation? ...Mark
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