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07-17-2016, 07:58 PM | #1 |
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Join Date: May 2010
Location: Northeast Penna
Posts: 2,108
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Darkening original engine bolts...
I searched the Forum earlier today, looking for info about recreating the blackish, "Raven" finish on original engine bolts.
Let me say that I am NOT building a "points car", but would like to come close to correct appearance. I saw some comments about cleaning the bolts ( de-grease, wire-brush ), heating with a torch, then dunking in used motor-oil. Can someone suggest a temperature to heat the bolts to if I were to heat the bolts in a pan, say in the oven or gas-grille (don't tell my wife!) ? It would be a lot more expedient ( and controlled ) to heat a batch of bolts in a controlled manner than for me to do one at time in a flame... Thanks ! Frank |
07-17-2016, 09:29 PM | #2 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Darkening original engine bolts...
I use G-96 gun blueing to darken mine. It does a great job, and as soon as I finish with the blueing I use ATF to oil them and keep the rust away.
I never had luck with Birchwood-Casey, but a guy in our club has made some nice specialty Model A tooling and used BC to darken the parts, and they came out perfect. I must have had a bad jar of the liquid. |
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07-18-2016, 01:28 AM | #3 | |
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Re: Darkening original engine bolts...
Quote:
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07-18-2016, 07:54 AM | #4 |
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Join Date: Nov 2015
Location: Tennessee
Posts: 714
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Re: Darkening original engine bolts...
I don't like the idea of heating bolts. Gun bluing works just fine IMHO.
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07-18-2016, 05:16 PM | #5 |
Senior Member
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Re: Darkening original engine bolts...
here is the best to use
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Mark Maron Ill., Region MARC & MAFCA MARC JSC Member MAFFI Trustee National Facebook Admin. https://www.facebook.com/groups/MARC.group/ A7191-Sport Coupe 29 Roadster 29-Town Sedan 29-Original Special Coupe |
07-18-2016, 06:44 PM | #6 |
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Location: albany
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Re: Darkening original engine bolts...
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07-18-2016, 08:56 PM | #7 |
Senior Member
Join Date: May 2010
Location: Hebron, CT
Posts: 432
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Re: Darkening original engine bolts...
The raven finish you are looking for is technically called black oxide. If you have a shop nearby that does heat treating and various types of metal plating and finishing they usual have the black oxide process. If you have a sizeable amount they might reprocess them for you. I have tried using naval jelly rust inhibitor which will turn bare steel to a matt black finish. I applied some to my antique tractor splined axle about 10 years ago and it still hasn't rusted.
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