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Author Topic: Brand new AAZ head precup peculiarity  (Read 9752 times)

Reply #15October 10, 2008, 06:18:41 pm

autoholic

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Brand new AAZ head precup peculiarity
« Reply #15 on: October 10, 2008, 06:18:41 pm »
Oh yea, looked like pitting at first glance.
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Reply #16October 10, 2008, 07:04:44 pm

rallydiesel

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Brand new AAZ head precup peculiarity
« Reply #16 on: October 10, 2008, 07:04:44 pm »
Quote from: "autoholic"
Now you got me thinking on that dropped precup scenario. I searched around but did not come up with any one who has has it happen. The precup is captured by the HG/head though right? so what happens, does it get loose and rattle around till it disintigrates? whatever it is that actually happens, it sounds nasty, I should look into peening mine too since I'll have my head off again this weekend.


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Reply #17October 10, 2008, 09:17:47 pm

jtanguay

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Brand new AAZ head precup peculiarity
« Reply #17 on: October 10, 2008, 09:17:47 pm »
i'm pretty sure the oil is there to prevent things like corrosion/pitting... if it is wd-40 though, that stuff actually eats certain metals... i think because it dissolves oils etc...

i personally think that peanut butter would be a better choice than wd-40.  the hard part would be cleaning it off when time came to use it.

hopefully whatever is on that head is not wd (water dispersant) 40!

Relevant topics on pre-chamber problems:

http://www.vwdiesel.net/phpBB/viewtopic.php?p=94048&highlight=peening#94048

http://www.vwdieselparts.com/forum/viewtopic.php?t=7799&postdays=0&postorder=asc&start=30

PEENING - Picture courtesy of libbybapa!
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Reply #18October 11, 2008, 12:41:10 pm

jimfoo

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Brand new AAZ head precup peculiarity
« Reply #18 on: October 11, 2008, 12:41:10 pm »
Quote from: "autoholic"
Now you got me thinking on that dropped precup scenario. I searched around but did not come up with any one who has has it happen. The precup is captured by the HG/head though right? so what happens, does it get loose and rattle around till it disintigrates? whatever it is that actually happens, it sounds nasty, I should look into peening mine too since I'll have my head off again this weekend.




Ummm, here is what happens.
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Reply #19October 11, 2008, 06:45:51 pm

bigblackcaddy

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Brand new AAZ head precup peculiarity
« Reply #19 on: October 11, 2008, 06:45:51 pm »
You guys figured it out.  The "pitting" is just oil on the head that picked up fuzz and dust when I tried to wipe it with an old towel.  It was in a plastic bag when I got it and had this light oil all over it as a preservative I assume.  

Thanks for the carnage pics/threads.  Ugh.  What is involved in peening?  Looks like you could just get a rounded punch or something and smack it with a hammer.  The groove in the edge of the precup might actually be a blessing in disguise... If you peen along that edge the head material would get slightly pushed out and keep the precup from falling down better than just tightening it in the hole.

Head is Kolbenschmidt from BleachedBora.  Some more pics here.

Extra Credit: Can anyone explain what this little ball is for?
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Reply #20October 11, 2008, 08:04:03 pm

blkboostedtruck

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Brand new AAZ head precup peculiarity
« Reply #20 on: October 11, 2008, 08:04:03 pm »
ahh now you say from bleached bora! if i would of known that!
his stuff is quality that he gets his hands on! to me it sounded like you got the head from a questionable joint and was not sure about it's machining work and the pics. were deceiving!
now i know where it's from! put the dam thing on and run it!
show pics. of your burnouts now on    :shock:
Duane
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Reply #21October 11, 2008, 08:31:51 pm

jtanguay

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« Reply #21 on: October 11, 2008, 08:31:51 pm »
Quote from: "libbybapa"
I don't really want the extra credit, but if I'm not mistaken, that ball plugs the end of the oil gallery that is drilled lengthwise from which each of the lifter bores are fed.  The other end of that gallery would be the oil pressure switch.

Andrew


i too wondered what that thing was... thanks!
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Reply #22October 12, 2008, 07:41:40 am

mk2diesel

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« Reply #22 on: October 12, 2008, 07:41:40 am »
yes they DO drop  :oops: ... hit valves / pistons / head  ....     then its replace the head / that piston / HG  / timing belt / valve cover gaskets /  ETC     ....
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Reply #23October 12, 2008, 08:22:56 am

TurboJ

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« Reply #23 on: October 12, 2008, 08:22:56 am »
That's an aftermarket head and they all habe that same crease. According to a specialist, it doesn't cause any problems. Just let it be that way  :)
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Reply #24October 12, 2008, 10:38:05 am

subsonic

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Brand new AAZ head precup peculiarity
« Reply #24 on: October 12, 2008, 10:38:05 am »
Quote from: "TurboJ"
That's an aftermarket head and they all habe that same crease. According to a specialist, it doesn't cause any problems. Just let it be that way  :)


Its a kolbenschmidt head.  OEM Head.
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Reply #25October 12, 2008, 12:06:26 pm

CoolAirVw

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Brand new AAZ head precup peculiarity
« Reply #25 on: October 12, 2008, 12:06:26 pm »
Quote from: "autoholic"
...... I searched around but did not come up with any one who has has it happen.




Mine fell after head work. The following thread discusses the problem.  

http://www.vwdieselparts.com/forum/viewtopic.php?t=7799&highlight=
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Reply #26October 13, 2008, 01:32:55 pm

autoholic

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Brand new AAZ head precup peculiarity
« Reply #26 on: October 13, 2008, 01:32:55 pm »
Ok, I'm sold on peening them, I want to avoid that carnage. I have the head off now, but discovered that my problem is not the head or gasket, it's a cracked block!
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