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Stock Valve Cover Finish

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3 minutes ago, Zed Head said:

It starts with 246's post, wasn't sure.  246's link doesn't go to the eBay page anymore either.

I read the whole thread and nobody actually mentioned paint.  246 showed some paint and a painted cover.  He seems to imply that it might be painted.  It looks painted.  But I don't think anyone ever really addressed the question.  They got off on to judging issues.

You probably want to stop using the lacquer thinner though.  Interesting puzzle.

Yup this is the one I purchased. Looked legit. Stickers were old and looked like we had a NOS cover. I’m puzzled because of the silver that is on the aluminum that has come off. It looks like paint on the rag and even balls up on the surface of the cover.

0CF4CDD5-B697-47BD-AABF-D2F8CA75F239.jpeg

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 I'd continue on with liberal amounts of lacquer thinner. All that will happen is you'll remove the aluminum color spray paint and get down to the original finish which was bare aluminum. IMO, the stickers were added after the paint job.

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7 minutes ago, Mark Maras said:

 I'd continue on with liberal amounts of lacquer thinner. All that will happen is you'll remove the aluminum color spray paint and get down to the original finish which was bare aluminum. IMO, the stickers were added after the paint job.

Here is the inside. Looks unused to me also.

ACB7B139-6967-42D3-9E88-58E2CC553C47.jpeg

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At one point in my Z career I was a ZCCA chief judge.  I orchestrated two significant shows, including the ZCCA ZCON 40th anniversary in Nashville 2010.  I think I can offer some insight with my opinion on this matter.  I think the valve covers came with some sort of aluminized paint finish that comes off with acetone.  I think that a bead blasted valve cover leaves a textured finish and that some judge dinked you for "over-restoration" if not an improper texture of the finish.  I think the the natural valve cover should have a uniform aluminum color with a cast aluminum finish "sheen" and very smooth.

I also think that judging a car is a significantly subjective endeavor.  Car show judges in most car shows are all volunteers with widely varying experience and the comments can easily vary between "sharp eye" and "are you outa your f'ing mind?"  In that respect, I don't put a lot of stock in the perceived value of an award.  It's sort of like racing; some days you're lucky and some days you're not. 

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7 minutes ago, 26th-Z said:

At one point in my Z career I was a ZCCA chief judge.  I orchestrated two significant shows, including the ZCCA ZCON 40th anniversary in Nashville 2010.  I think I can offer some insight with my opinion on this matter.  I think the valve covers came with some sort of aluminized paint finish that comes off with acetone.  I think that a bead blasted valve cover leaves a textured finish and that some judge dinked you for "over-restoration" if not an improper texture of the finish.  I think the the natural valve cover should have a uniform aluminum color with a cast aluminum finish "sheen" and very smooth.

I also think that judging a car is a significantly subjective endeavor.  Car show judges in most car shows are all volunteers with widely varying experience and the comments can easily vary between "sharp eye" and "are you outa your f'ing mind?"  In that respect, I don't put a lot of stock in the perceived value of an award.  It's sort of like racing; some days you're lucky and some days you're not. 

So spray it to look nice? I guess I was just under the perception that it was raw Aluminum with no coating. The inside is untouched. Learning something new for me.

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I could not imagine that the factory would expect the valve cover appearance to remain even remotely “in good condition” if it were shipped as pure bare un-treated alloy. Aluminum was not a “new” material in the late 60’s. It is no surprise they would apply some sort of preservative. Paint however is a surprise to me. Mostly its fun to realize that the bare aluminum assumption is likely wrong after all this time. Another day, another day of learning.  Now we can all go off and try to produce a paint formulation/process that reproduces the factory appearance.... 

I have to go out and touch just a corner of the back of my NOS cover with a dab of acetone and see what happens...

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Posted (edited)
16 minutes ago, zKars said:

I could not imagine that the factory would expect the valve cover appearance to remain even remotely “in good condition” if it were shipped as pure bare un-treated alloy. Aluminum was not a “new” material in the late 60’s. It is no surprise they would apply some sort of preservative. Paint however is a surprise to me. Mostly its fun to realize that the bare aluminum assumption is likely wrong after all this time. Another day, another day of learning.  Now we can all go off and try to produce a paint formulation/process that reproduces the factory appearance.... 

I have to go out and touch just a corner of the back of my NOS cover with a dab of acetone and see what happens...

Acetone vs not touched pic. Clearly see were I rubbed it off on top vas below.

0CF6F3F8-EF30-4322-A1F7-3DAA65C158F9.jpeg

Edited by Frankenstein

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If the valve cover is NOS why would it have a different finish than the ones on a car?  Nobody is saying that the covers on the car have paint on them, are they.  There must be other replacement valve covers out there from Aitoku.  Nobody has one?  The original question was - "did I get ripped off?".

Seems like you have to choose between making a replacement part look it came on the car, or keeping the history of the replacement part intact because it has its own interesting history.  Are the stickers still on it?  If not, it probably doesn't matter.  Wipe that paint off and replicate.

http://www.aitoku.co.jp/e-aitoku/aitoku.html

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2 minutes ago, Zed Head said:

If the valve cover is NOS why would it have a different finish than the ones on a car?  Nobody is saying that the covers on the car have paint on them, are they.  There must be other replacement valve covers out there from Aitoku.  Nobody has one?  The original question was - "did I get ripped off?".

Seems like you have to choose between making a replacement part look it came on the car, or keeping the history of the replacement part intact because it has its own interesting history.  Are the stickers still on it?  If not, it probably doesn't matter.  Wipe that paint off and replicate.

http://www.aitoku.co.jp/e-aitoku/aitoku.html

No stickers are off and saved. As soon as that thing heated up I was afraid they would fly off. 

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 I like to see the history of things myself.  I probably would have set the unique valve cover on a shelf or brought it to the shows and found a different cover to put on the show car engine.  You have a one of a kind valve cover, but there's going to be a bunch of identical lookiing cars at the show.  That's the thing about the shows, everyone's trying to make their cars look identical.

No offense.  I'd put those labels under glass so you can show them.

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Call me skeptical, but I'd be very surprised to hear that they painted the valve covers. Maybe, by some wild stretch.... Maybe someone could convince me that the very early valve covers got some paint, but by the time they got to the NISSAN OHC covers? I'm very skeptical.

Frankie, Is the inside painted? Can you use the same solvent you used on the outside and see if anything comes off the inside?

I do know (from unfortunate yellowing and peeling experience) that they clear coated the later valve covers. I don't know if they did that all along, but by the end, they were.

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Posted (edited)
44 minutes ago, Captain Obvious said:

Call me skeptical, but I'd be very surprised to hear that they painted the valve covers. Maybe, by some wild stretch.... Maybe someone could convince me that the very early valve covers got some paint, but by the time they got to the NISSAN OHC covers? I'm very skeptical.

Frankie, Is the inside painted? Can you use the same solvent you used on the outside and see if anything comes off the inside?

I do know (from unfortunate yellowing and peeling experience) that they clear coated the later valve covers. I don't know if they did that all along, but by the end, they were.

Well Captain, I did try and the solvent has no affect on the inside. It is bare aluminum with no coating. I also believe this cover was never used due to the sealant on the inside not being stained from oil.

FCC714D5-E4DF-4D32-A9AD-F7ABCB494720.jpeg

Edited by Frankenstein

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Yeah, that's what I figured. I didn't think the inside would be coated. Even if they did coat the outside, I would guess they were less worried about the inside. Not only the because you can't see it and they don't care as much, but it's also in an oil bath.

So the real question is... Is that silver paint factory, or was it applied by someone else in the past?

I don't really like the look of the sealant on the PCV baffle cover on the inside either. And the soft corners on the machined bottom surface. The ones I've messed with were machined and barely deburred. You could still slice open a knuckle if you caught that edge wrong. Yours looks like it had sandpaper run along it to soften the corners. I do that when I work on stuff, but the factory usually never does.

Wish I could help more. I really don't know.

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I can't help wondering....

I have seen OEM parts for other old cars, some produced after the series production for which they were intended, that had a protective coating to enhance their shelf life.

Just a thought...

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14 minutes ago, ensys said:

 

I can't help wondering....

I have seen OEM parts for other old cars, some produced after the series production for which they were intended, that had a protective coating to enhance their shelf life.

Just a thought...

This could be exactly what they did for this replacement part. Was supposedly hanging on a guys wall in office for over 35+ years. Maybe they did not do it for the cars being delivered brand new. Who knows, thanks to everyone for their input.

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9 hours ago, Frankenstein said:

 my rag starts to turn silver. I’m thinking I either messed up, this thing has been painted, or maybe they put something on at the factory. I pulled the stickers off and underneath they have the same silver that comes off with a rub and some thinner. It looks like paint. 

Somebody used silver paint.  That is not a clear coat or typical protective finish.  I have no idea what Aitoku does or did but your after sale replacement cover has silver paint on it, by your description/  Maybe Aitoku was given the contract to produce replacement covers and that's how they did theirs.  Painted them silver.

So, in car show terms it's not "factory" so you'll get dinged.  In historical terms it might be a bona fide replacement valve cover, part of the complete history of the cars.  But you have to destroy the Aitoku history to win your car show points.  Seems ironic.

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So who is Aitoku? Is that supposedly the company that cast the valve covers?

Seems weird to put that label on it that talks about making sure you have oil. "NOT INSTALLED ANY OIL ON THIS ONE!"

Like someone bought a valve cover from the local Nissan dealer 35 years ago with the intent of making it a show piece or collectors item? Who does that for a car that's only ten years old? The labeling just makes it weirder.

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I believe someone added the paint job and stickers to improve the looks of their wall art. If you value the paint and stickers keep it as is. If you clean it up, you'll have a normal valve cover.

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I don't think that anyone knows what's up with that valve cover.  How many valve covers get replaced on these cars?  They don't get dented like steel covers, and the paint doesn't get chipped 'cause they're not painted.  If it is real, how many have been sold?  Probably not many at all.

It might be real, it might be fake, Frankenstein might have gotten ripped off, but it still looks right so will probably get some points in a car show.  Maybe he just overpaid.

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I took off the paint. I have stickers, pics, and a story to tell. Still looks nice since it was protected all this time.

540DF933-E8BD-4A94-8C2B-05790B34D04C.jpeg

6D17426F-50C5-4FBD-BBD0-CD5D22BDB595.jpeg

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Posted (edited)

Even bare ( cast ) aluminium can have different finishes. A light coat of heat resistant mat paint from the factory would make sense.

The inside of the cover obviously would be bare aluminium since the oil film wil protect it. And they wouldnt want to risk paint coming of on the inside would they

But anyhow it's a good question..

Edited by bartsscooterservice

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