Author Topic: Brand new AAZ head precup peculiarity (Read 9717 times)

bigblackcaddy · « **on:** October 09, 2008, 11:02:26 pm »

Should it be flush or is the that little trough on the top edge normal? All four are like this, so I'm guessing it was meant to be that way (or somebody screwed up four times exactly the same)... but why?

blkboostedtruck · « **Reply #1 on:** October 10, 2008, 07:56:43 am »

they should be flush! sounds like it was not finished yet?
Duane

zukgod1 · « **Reply #2 on:** October 10, 2008, 08:15:25 am »

Doesn't sound right that's for sure.

Can ya post up a pic?

VW_Commuter · « **Reply #3 on:** October 10, 2008, 08:20:44 am »

That looks like a dropped pre-cup waiting to happen.

bigblackcaddy · « **Reply #4 on:** October 10, 2008, 09:12:06 am »

I tried to imbed a pic. It's working for me, but I guess some of you can't see it.

Try this link

zukgod1 · « **Reply #5 on:** October 10, 2008, 09:42:00 am »

That's not a very good pic to see what we need to see.

Your saying then the pre cup is sticking up above the machined surface right?

blkboostedtruck · « **Reply #6 on:** October 10, 2008, 09:56:54 am »

I can tell it's up high! and looks like the edge is broken away!
if left like that you would prolly drop the precup and the HG gasket would not seal?
Duane

bigblackcaddy · « **Reply #7 on:** October 10, 2008, 10:26:00 am »

Sorry, I didn't describe it very well. The precup is flush with the head surface, but that groove along the top side is what concerns me. I meant should it be flush all the way around, i.e. no groove. I think blkboostedtruck's "looks like the edge is broken away" comment is directed at what I was looking at. All four are "broken away" the same though, so it looks like it was intended, which is why I ask.

zukgod1 · « **Reply #8 on:** October 10, 2008, 10:56:09 am »

Ok so its flush, that's solved then.

The part that looks to be missing would not have came that way from the factory and I cant think of a reason why a machine shop would do that either.
That area is stepped so unless all the material is missing I don't see it being a issue.

I don see it being a problem however, I would peen a couple spots around the precups so there is less of a chance of them falling out.

From what I can see that head is in great shape.

subsonic · « **Reply #9 on:** October 10, 2008, 03:47:02 pm »

Who is the head maker? Where did you get it?

jtanguay · « **Reply #10 on:** October 10, 2008, 04:12:47 pm »

i would consider peening the area around the pre-cups to ensure you don't drop one... anyone have the link on how to do it?

autoholic · « **Reply #11 on:** October 10, 2008, 04:20:07 pm »

Looks like alot of pitting for a new head.
The peening idea sounds like a good one, but I'd be somewhat scared to do it, fearing I may actually loosen it. Dropped prechamber; that would make a hell of a sound!

rallydiesel · « **Reply #12 on:** October 10, 2008, 04:44:01 pm »

I agree with the pitting comment. That surface looks quite rough. I would hope you'd get it milled before using it cuz you're asking for a head gasket failure as it is now.

autoholic · « **Reply #13 on:** October 10, 2008, 04:53:22 pm »

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.

dino1 · « **Reply #14 on:** October 10, 2008, 06:06:49 pm »

there appears to be wd-40 or some type of oil on the head, the oil has picked up some dirt and that is the pitting you see. Look at the edge of the head where the fluid has built up.

Author Topic: Brand new AAZ head precup peculiarity (Read 9717 times)

autoholic

autoholic