Local Copy - TDI Piston Info

1999 1999 AHU (A-3) engine # 101808 and above Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

1999 AHU / 1Z (A-3 & B-4) engine # 101807 and lower Cyl 1 & 2 038-107-065-D Cyl 3 & 4 038-107-065-E

1999 AHU engine # 101808 and above Cyl 1 & 2 028-107-065-BK (ALCAN) Cyl 3 & 4 028-107-065-BN (ALCAN)

1998 1998 AHU / 1Z (A-3 & B-4) engine # 101807 and lower Cyl 1 & 2 038-107-065-D Cyl 3 & 4 038-107-065-E

1998 AHU engine # 101808 and higher Cyl 1 & 2 028-107-065-BK (ALCAN) Cyl 3 & 4 028-107-065-BN (ALCAN)

1998 AHU (A-3) engine # 101808 and higher Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

1997 1997 1Z / AHU engine # 101807 and lower Cyl 1 & 2 038-107-065-D Cyl 3 & 4 038-107-065-E

1997 AHU (A-3) engine # 101808 and higher Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

1997 AHU (A-3) engine # 101808 and higher Cyl 1 & 2 028-107-065-BK (ALCAN) Cyl 3 & 4 028-107-065-BN (ALCAN)

1996 1Z engine # 101807 and lower Cyl 1 & 2 038-107-065-D Cyl 3 & 4 038-107-065-E 1996 engine # 101808 and higher Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

A-4 ALH engine A-4 ALH series 1999.9 thru 2003 Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

Now here is where I'm a bit confounded: The AHU and 1Z engines both have the same block (028-100-090-TX) Both engines use the same crank (028-105-101-L) Both engines use the same rods (028-198-401-F)

The only thing I see different between these engines (1Z / AHU) are the pistons.

Early: AHU / 1Z (A-3 & B-4) engine # 101807 and lower Cyl 1 & 2 038-107-065-D Cyl 3 & 4 038-107-065-E Late: Cyl 1 & 2 038-107-065-AA Cyl 3 & 4 038-107-065-AB

The A-4 ALH engine uses the same connecting rods (028-198-401-F)

My questions are: Ques. #1 Are these pistons the same but only different manufactures? 1998 AHU engine # 101808 and higher Cyl 1 & 2 028-107-065-BK (ALCAN) Cyl 3 & 4 028-107-065-BN (ALCAN)

1998 AHU (A-3) engine # 101808 and higher Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

Ques. #2 Are the pistons for the higher # series (101808 & higher) the same design but different manufactures? ALCAN ~V~MAHLE ? In other words are these pistons interchangeable? Cyl 1 & 2 028-107-065-BK (ALCAN) Cyl 3 & 4 028-107-065-BN (ALCAN) Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)

Ques. #3

If you were rebuilding a 1Z or AHU of any series # (high or low) What is the reason you could not use the A-4 pistons (as long as you used all 4 of the same P/N AA & AB)? Cyl 1 & 2 038-107-065-AA (MAHLE) Cyl 3 & 4 038-107-065-AB (MAHLE)