Broken lifter - stupid, stupid, stupid

[Gizmoman]

Guys,
I found a Victor Reins one hole Metal Head Gasket part number 028103383BP, it says its for an AHU engine.
http://www.autohausaz.com/search/product.aspx?sid=yyju1dityuemczj1jfxzkw45&makeid=800026@VW&modelid=1359996@JETTA%20TDI&year=1998&cid=20@Engine%20Parts,%20Seals%20%26%20Gaskets&gid=5412@Cylinder%20Head%20Gasket

The price is awesome but I'm not sure if it will fit my AAZ - can anyone let me know?
They also have a great price on an exhaust valve but it's a 7 mm stem and thats all they list. This really has me thingking that I may have put 8 mm seals on my 7 mm valves (as suggested by libby).

[theman53]

sadly no, they don't have the precup resting spots so it won't work for the aaz. I listed part #s in the FAQ section to the aaz gaskets and you can search. The cheapest route should be going to canada and having one of the guys ship you down one. Autohaus only sells the 2 and 3 notch for the aaz.

[Gizmoman]

OK,
I pulled he valve stem seal and I think buying those fancy pliers just paid off - it looks good as new after I got it off.
Then I pulled the potentially damaged valve and checked it as recommended by Toby and a few others.



- woohoo! - it's dead on "0" as I turn it in the V-block against the stop. I don't think I'll replace it at all.

By the way libby, you were right, the valves stems are 7mm and so were the seals I installed after the porting - don't know what I was thinking.

All I need now is a new one hole HG and a lifter.

[Gizmoman]

sadly no, they don't have the precup resting spots so it won't work for the aaz. I listed part #s in the FAQ section to the aaz gaskets and you can search. The cheapest route should be going to canada and having one of the guys ship you down one. Autohaus only sells the 2 and 3 notch for the aaz.

I checked out your list in the sticky - very nice sir. I am now at least able to search with real data - thanks - should have checked it before.

Another nice chap (BYM) has offered to look in the Northern territory for me and report back.

[libbydiesel]

G-man, just for gits and shiggles put a stop in your v-block so that the edge of the v-block is midway in the shaft of the valve and half of the valve is hanging over and measure the runout one more time. 

[Gizmoman]

G-man, just for gits and shiggles put a stop in your v-block so that the edge of the v-block is midway in the shaft of the valve and half of the valve is hanging over and measure the runout one more time. 

Right, I'll do that - I also may have a 1/4" R8 collet I'll chuck into the mill - hopefully it will clamp the 7 mm stem. I can stick it out various distances and check it that way as well.

[Gizmoman]

I actually had a 9/32nds collet which fit the 7 mm stem nicely. The .005 resolution indicator moved 3 lines on the face and 1-1/2 lines on the seat (odd). I believe that's .0015/.00075 respectively.

I also did the V-block test as suggested - placing a stop inside the V which put the stem hanging halfway off the block edge. I measured again. Face was .00075 and seat was .0005. Seems I need to change the old spindle bearings on the mill.

So, for a "standard" I pulled another exhaust valve and did the same V-block test. The results are identical to the valve that was loaded. Apparently KS feels these numbers are within spec so I'm going to run the valve.

Just to point out, when the lifter broke I was on the last leg approaching the 125 ft/lbs on #8 in the sequence (right over that valve). My climb to the 125 was in 50 lb increments. Also, the cam lobe was not at full lift or I would have felt it when installing the head.

Obviously I loaded the valve stem heavily, but it was a very gradual and perpendicular load (guided lifter and guided stem). The only un-guided, off-center load was the lifter surface to the partially rotated cam lobe - SNAP.

I suppose there could be some weird molecular things going on onside that valve stem which may lead to the head popping off. But I think that it would show some sign of deviation from the other valve I checked - I found none.