Location of engine # on 3.4?

[speeder]

Does anyone know where I look for the engine serial# on my '99 996? I am on a mission to determine whether the engine has been replaced, (it was not under warranty), so I also need to somehow find out what the # would be for an extremely early production '99. (Build date 2/98). If my # is not consistent with that, I'll know it's been changed.

TIA.

[450knotOffice]

Call Laura at Hergesheimer. She'll tell you. Tell her I told you to call her (Scott Romanos)

Congrats on the new to you 996. He11 of a car. I've taken mine to the track (Big Willow) four times and have had a blast!

[barchy]

hi, i saw your post about you needed to know if your engine was changed or not. Now i have the same problem, i bought a 996 3.4 `99 and the seller told me the engine has been changed for new one, but how can i know it by serial number?
regards

[FANBOY]

the engine number should be stamped on the underside of the crankcase

[barchy]

Ok, tks , but i want to know how to know with the serial number if the engine has been changed or not, i think if the date of the engine is newer than `99 year then the engine has been changed
Tks and regards

[Wayne 962]

Post the engine serial number, and I can probably check...

-Wayne

[barchy]

Hi,
I saw 2 numbers, i post both.
996.104.139.1R 3.4L
M36/01AT66X67532

Tks a lot,

[barchy]

Hi, any news about?
tks and regards

[stevelb]

Originally Posted by barchy

Hi,
I saw 2 numbers, i post both.
996.104.139.1R 3.4L
M36/01AT66X67532

Tks a lot,

AT in front of the serial number. This means Austauschmotor or exchange motor. You have a factory rebuilt normally aspirated motor for a 1999 (66X)
66Y is 2000
661 through 665 is 2001 through 2005 respectively
Last 5 digits are the serial number