Engine cast stamp “25L” ??

[adampug11]

Hi Guys can anyone help my confirm or identify which block I have?

its stamped “054103021”. I believe it to be a 3B but there is another stamp underneath with 25L. Does this denote displacement? Or is it just a random stamp.

Cheers

Adam

[M2ki]

054103021 is a casting number not a part number. Look at the flat spot, there must be engine code stamped in.

[adampug11]

Thanks for the reply.

this plate is blank unfortuably. I believe Audi started putting the PN on the head and not block ?

[S2TORNADO]

054103021 is 3B block.

[rxl]

Just measure the deck height and you will. Know if it's a 2.2 or 2.5

[adampug11]

Is the deck height measured from head gasket to centre of crank ? It is 220mm.

Thanks
Adam

[M2ki]

054103021 is 3B block.

As I said before, it is not a part number. It is a casting number.
It can be 3B, and it can also be NG or NF or PS.

Don't bother measurign the deck height. Measure the bore.
If 81, then PS, if 81.5 then 3B, if 82.5 then NG, NF or 7A

[rxl]

Is the deck height measured from head gasket to centre of crank ? It is 220mm.

Thanks
Adam

its not a 2.5 so now only the bore size will say the rest.

[adampug11]

Thanks the machine shop have bought oversize pistons due to bore wear, can’t remember what size they measured I will have to check.

as long as it’s not a 2.5 block it’s good .

[S2TORNADO]

As I said before, it is not a part number. It is a casting number.
It can be 3B, and it can also be NG or NF or PS.

Don't bother measurign the deck height. Measure the bore.
If 81, then PS, if 81.5 then 3B, if 82.5 then NG, NF or 7A

It is the part number.
Audi didn't sell the blocks by themselves, only with the pistons together. It is the individual part number of a sub assembly. Only the "full" part number is listed by audi.

This is the same as ABY/AAN/ADU which again has a part number(it starts 034) but only the sub assembly is listed by audi.

[S2TORNADO]

Re post 10 the ABY/AAN/ADU part number is 034103021M for the block. The sub assembly number is 034103101N which is the block and pistons together.

[rxl]

all s2 engine didnt have a stamping of engine code so makes it a turbo part and the casting number missing M tells its a 3b.

[M2ki]

It is the part number.
Audi didn't sell the blocks by themselves, only with the pistons together. It is the individual part number of a sub assembly. Only the "full" part number is listed by audi.

This is the same as ABY/AAN/ADU which again has a part number(it starts 034) but only the sub assembly is listed by audi.

This "part number" says only it is old style 220mm 5 cylinder unmilled piece of metal and nothing more.

[S2TORNADO]

This "part number" says only it is old style 220mm 5 cylinder unmilled piece of metal and nothing more.

It is audi's own number, not the forge's cast number.
I'm fairly sure audi put NG on the NG engines. I think there is an extra hole for the tensioner too.
The OP hasn't got NG on his and i don't think it has the extra hole either. Therefore it is a 3B.

[M2ki]

all s2 engine didnt have a stamping of engine code so makes it a turbo part and the casting number missing M tells its a 3b.

Do I understand correctly, that 3B engines didn't not have the 3B stamped on flat piece?