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Thread: Cleaning up bolt threads
08-13-2012, 05:43 PM #1
Cleaning up bolt threads
I have some bolts that had a lot of build up and gunk in the threads and I recently cleaned them up using a wire wheel, but it also removed the finish. Does anyone know of any good way to restore the finish? I want to prevent rust from occurring. I know that restoration pros reuse old bolts and I am wanting to do the same. Thanks.
08-13-2012, 06:57 PM #2
A lot of different finishes Mike, where were the bolts used?Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
08-14-2012, 03:36 PM #3
Bolts off of the intake manifold, the bell housing, and exhaust manifolds. They are coated with a black oxide finish.
08-14-2012, 05:39 PM #4
Some bolts can be reused, I would not reuse exhaust man bolts (heat damage). The intake and the bell housing require bolts that can be properly torqued. I doubt if these old bolts can now be torqued with any reliability (my $0.02).
08-17-2012, 09:05 PM #5
I gotcha, RayVoy. Much obliged. Would you know where I could purchase some new bolts for the intake manifold and bellhousing? I haven't had any fortune yet, but I keep searching. Ones from junk yards probably won't be much better in condition... Being a '93 model and all... Unless other intake manifold bolts on newer trucks will work... Thanks again.
08-18-2012, 09:41 AM #6
Auto parts guys should be able to help. The guys who sell overhaul kits for engines (not the guys selling oil and spark plugs).
If I couldn't find them at a parts store, I'd try a shop that offers engine rebuild services.
08-18-2012, 10:22 AM #7
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Big Mike if you cant find them at an auto parts store try on-line at places like Jegs, or Summit, or if you have a local Fastenal store.
If it's a bolt requiring a torque your normally better off replacing it, bolts stretch and after being torqued once or twice are not considered able to give a reliable torque reading if reused.
08-19-2012, 07:43 PM #8
Thanks for the info, I appreciate it. I will do some homework. I know of some local spots to check out and I will check online.
08-19-2012, 10:46 PM #9
Try LMCtruck. They have parts for trucks going way back.
As was said before reusing bolts with a torque spec is not a wise Idea.
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09-24-2012, 02:33 AM #10
Fasteners that are torqued can be re-used. However, there are some applications that you want to just replace them. Your main query is about putting black oxide back on the fastener or in cleaning them up to re-use them.
Here is what I do if I re-use fasteners. 1) run the fastener through the correct size/pitch/thread count die to clean the threads. If threads are mucky, then I will clean with a solvent. I usually use kerosene, paint thinner or Toluene. Alcohol won't work well because it is not a non polar solvent; 2) clean the fastener (see previous text, or if not too bad, clean with BrakeClean or equivalent).
To buy new fasteners, you often have the option of using an industrial fastener supplier that sells retail. Best pricing. It is what I do if I don't use the dealer, which I do for a lot of fasteners to make sure they look exactly the same as what was in there. They also carry some automotive specialty fasteners. You simply bring in what you have, and they will match it up with the correct grade fastener for your application. Black oxide coating and all. If you don't have access to a fastener supplier, then either the dealer or LMS is what I recommend.
If I have a set of fasteners and some look beat up, I just buy all new ones. If I have to clean up more than maybe 4-6, I may just replace them. Less labor intensive. And if it is an important fastener on the engine, I just replace it with a new one.1994 Chevy K2500 Silverado, 454 (modified), original owner.
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