I finally got done with the lower part of my AWM engine, took all the pistons out, cleaned them, lubed them and changed all the rings. Also honed the cylinder walls and replaced the oil pump, oil stand gasket, etc. Now I’m getting ready to install the head. I’ve acquired a used one that seems to be in good shape, the guy I’ve got it from rebuilt his AEB engine and wanted to used a 06A head, after he installed it, didn’t like the results and went back to use the old style head.
After reviewing the good head, and comparing it with my damaged one, I noticed that the cams are positioned differently. Now (I must point out that my passat is a 2004), I also noticed that my head has the 058 coding and the one I’m replacing it with has the 06A code, Here are pictures of the two head sides:
The “old one”
The “new one”
After Lining the lobes in the same area, look at the TDC mark on the 06A head:
I’m trying to make sense out of this puzzle; my old head has the exhaust valves bent but the cams and timing never got damaged, so I don’t think they’ve moved at all. The new replacing head supposedly worked fine and should be synchronized as well. One idea that comes to mind is that I read there are differences between the 058 and the 06A heads relating to cam gears, but I don’t know exactly what that means or if that is the case here, or if I need to adjust something on the 06A head, or does variable timing compensates for it? .
I really need to find an answer for this so I understand what is going on.
Any help is much appreciated. Thanks.