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whar does the yellow and red paint on bolts signify?

I'm curious as to what the yellow and red paint on engine and other bolts signifies.
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Old 04-29-2010, 05:43 AM
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yarfk
 
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"torque stripes"Applied at the factory to indicate that the bolt was torque properly. If there is a break in the paint mark then the bolt was removed and or it backed out.
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Old 04-29-2010, 07:37 AM
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also...

The paint also lets the next person in line know that the part was torqued properly. Different colors signify different torques. I use yellow for low, red for high, and white for the really snug stuff. However, it differs from one factory to another on an almost daily basis and to be honest with you, they may have been using whatever color was handy.
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 : Black 94 Jag XJ12 (Madam Jaguar) and Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix.
Old 04-29-2010, 08:00 AM
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Ok. Thanks.
Is there no unofficial colour convention in use that I should use when rebuilding?
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1990 944 T: 100 000 km/63K miles,
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Old 04-29-2010, 12:47 PM
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I would pick a unique color that indicates you have torqued the bolt to spec
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Last edited by kfray; 04-29-2010 at 01:59 PM..
Old 04-29-2010, 01:11 PM
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You have an assembly line in your garage?
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Quote:
Originally Posted by fmartenies View Post
You have an assembly line in your garage?


I'm just assembling one engine, and the "affected" parts on the car, but I want it to look as close to original as possible. I probably wouldn't care if I had some suitable paint lying about, but as I have to buy some I might as well get the commonly used colours if they exist.
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Old 04-29-2010, 02:06 PM
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As far as style, we all have our preferences. I just would not rely on a painted mark on a bolt signifying it was torqued properly and always will be throughout the rest of the job. Rotating a bolt is not the only way torque can change...think of why you are supposed to tighten lugs in a star pattern...

Just saying its a bad idea other than cosmetic.
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Old 04-29-2010, 08:32 PM
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I see what you mean.
I guess I'll just do it for the authentic look then.

Thank you all for your opinions.
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Old 04-30-2010, 12:57 AM
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I don't remember which color came first (you could tell by which is on top/bottom), but the first mark was done by the worker that assembled and torqued the bolt and the second was from the second worker that checked the bolt. If you are doing a concour restoration or want your car to look original, you will definitely want the right colors.
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Old 04-30-2010, 11:57 AM
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concour concurance

OK. OK, here is how to do it for the extra point or two at the concourse...Get a sample of the ORIGINAL color, go to Home Depot, or wherever and get them to match the color. I know, it sounds nuts. It IS nuts. but if done right very few will be able to tell the diff between your job and the factory. There are also a lot of commercially available colors that are a really good match. Hint...what kind of paint might the factory have lying around....ummmm....color coat from the previous years?

Anyhow, post the color # for what you find on the (description) part and it's corresponding torque setting and you might get a half way decent table going.

Oh, and can we PLEASE not talk about "brush strokes" and " brush widths" to match original assembly lines. There are some levels of detail that sane people shouldn't go to.
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 : Black 94 Jag XJ12 (Madam Jaguar) and Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix.
Old 04-30-2010, 12:12 PM
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Excellent!
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Old 04-30-2010, 12:37 PM
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Ah this is turning into a difficult thread for me. Do you turn it into a museum piece, or drive it til the wheels fall off. I am sure it was intended for somewhere in the middle, but its just unnatural to put any well built performance vehicle on a pedestal. Stock up on parts and drive the hell out of it til you or the car cease to exist.
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Old 04-30-2010, 02:31 PM
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When I worked for the government, we used glyptol (red) to mark bolts/screws when torqued. This wasn't put on until complete assembly was checked for proper torque. This mark identified the part as being torqued to spec, and also indicated if something affected that torque, such as somebody deliberately tightening or loosening the hardware, or by vibration or mechanical failure. If your rebuilding an engine, it's a good way to keep track of what you did and didn't torque to prevent failure of a component when you finally start it up.
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Old 04-30-2010, 06:35 PM
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Old school superstition

OK kids, Painting a bolt goes WAYYY back. Not only to keep track of what you have done (or didn't do), As a quick visual aid to SEE at a glance if the bolt has loosened (torque stripe), To prevent "tampering" (were sorry sir, somebody has worked on your car BESIDES the dealership, we are revoking your warranty), To determine who did the work for accountability..(hey, whoever uses green paint, his engines keep blowing up!) , To "dress up" an engine..(Oh, My..What Pretty yellow bolts), to reduce corrosion, and here is the trivia.....During WW II it was used on fighting craft to chase away GREMLINS! No, I am not making this up folks.... Superstitious mechanics used to paint bolts for good luck. I surmise that they were incredibly bored back then with no TV or video games and with the war on and everything, people were understandably a bit nuts. If you wanted to "Feung shway" a car...(Ok, the spelling on that one is probably off) you would use red on the bolts (PLEASE DON'T ask me how I know this)

Anyhow, IMHO, if it makes you happy...go for it. I got 1 lousy point at a councourse for matching the original torque paint...1 LOUSY point. Freaking judges...I DRIVE my cars...OF COURSE, they have scratches on the underside! Sure! give it to the guy who TRAILERS his car in with 185 ORIGINAL miles on it! What is the point of THAT ?? whoops, sorry about the rant guys...
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 : Black 94 Jag XJ12 (Madam Jaguar) and Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix.
Old 04-30-2010, 07:09 PM
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I'm really enjoying this thread, plenty of opinion in here. If I only could get this amount of response on the more technical posts

I agree that a car should be driven. The thought of taking it to a concourse hasn't crossed my mind. I can see why people enjoy it however, and I probably would too if I had more than one car. Thanks for reminding me though that this one is for driving! That's why I bought it, and that's why I pulled the engine in the first place. To restore the performance lost to cracking rubber seals and o-rings.

I do enjoy doing things "right" however, and to me that involves a lot of learning. I guess I half expected Porsche to use standard colours, say yellow for medium torques and red for low. I didn't know that the workers had their "own" colours, or that the torques were checked by a second worker. I didn't notice that there were two colours on my bolts. I does make a lot of sense though.

Since I'm assembling the engine I consider painting the bolts worth doing. I will simply find some similar looking paint to stick on the bolts when I check them. This way i can make sure I'm not missing any and to be able to check them for movement later.

I guess this thread shows that I'm getting close to completion.
I can't wait.
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Old 05-01-2010, 01:33 AM
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Quote:
Originally Posted by bebbetufs View Post
yellow for medium torques and red for low. I didn't know that the workers had their "own" colours, or that the torques were checked by a second worker. I didn't notice that there were two colours on my bolts. I does make a lot of sense though.
Doesn't make sense to me! For the second worker to check the torque, he (or she) would have to
break the first paint mark. What sense would that make?

And red for low?? That seems bass akwards to me. I would think that the obvious scheme to use would be to go green on low, yellow on medium, and red on high. Or maybe yellow on low, orange on medium, and red again on high.
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Old 05-02-2010, 11:02 AM
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