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Old Apr 17, 2010 | 11:05 AM
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Default Engine Code
The Engine Code numbers on the label of my maintenance manuel do not relate to the descriptions of engine codes in the "996 Essential Companion" book. They are M9604-661. Should I be suspicious? Maybe somebody here can help.
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Old Apr 17, 2010 | 11:24 AM
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What year and model do you own?
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Old Apr 17, 2010 | 11:25 AM
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M9604-661 would be MY2001 Carrera 3.4 liter engine. Looks fine to me.
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Old Apr 17, 2010 | 11:40 AM
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2001 C-4
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Old Apr 17, 2010 | 01:14 PM
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My book also has M9604-661 and I have a 2001 C4.
Does this help?
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Old Apr 17, 2010 | 01:37 PM
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Yes. Thanks. But I don't understand the engine codes as described in the "Essentials" book.
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Old Apr 17, 2010 | 05:00 PM
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I think the Essentials book is giving you the code stamped onto the engine itself like M96.01, M96.02 and M96.03.

Is that what you are seeing?

Maybe this will help.

EXPLANATION OF ENGINE NUMBERS
=============================
DIGIT: 1 2 3 4 5 6 7 8
EXAMPLE: 6 6 W 0 0 1 3 6
= = = =========
! ! ! !
ENGINE TYPE (6 = 6-CYL.-ENGINE)-----------------------+ ! ! !
! ! !
ENGINE VERSION ----------- --------------------------- + ! !
! !
MODEL YEAR -----------------------------------------------+ !
!
SERIAL NUMBER ------------ --------------------------------------+
ENGINE
VEHICLE TYPE TYPE MY ENGINE NO. TECHNICAL DATA
911 CARRERA M96.01 98 W 66W 00501>60000 6ZYL/3,4L /220 KW
911 CARRERA M96.01 99 X 66X 00501>60000 6ZYL/3,4L /220 KW
911 CARRERA +M620 C4 M96.02 99 X 68X 00501>60000 6ZYL/3,4L /220 KW
911 CARRERA 2/4 M96.04 00 Y 66Y 00501>60000 6ZYL/3,4L /220 KW
911 CARRERA 2/4 M96.04 01 1 661 00501>60000 6ZYL/3,4L /220 KW
911 CARRERA 2/4/4S FL M96.03 02 2 662 00501>60000 6ZYL/3,6L /232 KW
911 CARRERA 2/4/4S FL M96.03 03 3 663 00501>60000 6ZYL/3,6L /235 KW
911 CARRERA 2/4/4S FL M96.03 04 4 664 00501>60000 6ZYL/3,6L /235 KW
911 CARRERA 2/4/4S FL M96.03 05 5 665 00501>60000 6ZYL/3,6L /235 KW
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Old Apr 17, 2010 | 06:00 PM
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Thanks. That answers it.
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Old Mar 25, 2021 | 05:52 AM
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Default 996 engine replace
I have an engine 3.4 m9604 2001 model which is broken. Can i replace it with another engine with code m9601 or m9602 or i have to change the wire from my m9604
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Old Mar 25, 2021 | 10:18 AM
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Originally Posted by Kgb
I have an engine 3.4 m9604 2001 model which is broken. Can i replace it with another engine with code m9601 or m9602 or i have to change the wire from my m9604

Any 3.4l motor from a 996 will work. There were some minor changes to some sensors and vacuum line differences over the years due to options. Also the throttle bodies are a cable version to 99.

That being said as long as u swap the sensors (or verify same) and extenal stuff over it will work with your dme.

The 3.6l or newer u would need an entire care as a donor and get very expensive.

Same vintage 3.2l boxter motors can also be used.
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Old Mar 25, 2021 | 01:05 PM
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Originally Posted by De Jeeper
Any 3.4l motor from a 996 will work. There were some minor changes to some sensors and vacuum line differences over the years due to options. Also the throttle bodies are a cable version to 99.

That being said as long as u swap the sensors (or verify same) and extenal stuff over it will work with your dme.

The 3.6l or newer u would need an entire care as a donor and get very expensive.

Same vintage 3.2l boxter motors can also be used.
Thanks a lot for your prompt reply
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Old Mar 26, 2021 | 08:35 AM
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Originally Posted by De Jeeper
Any 3.4l motor from a 996 will work. There were some minor changes to some sensors and vacuum line differences over the years due to options. Also the throttle bodies are a cable version to 99.

That being said as long as u swap the sensors (or verify same) and extenal stuff over it will work with your dme.

The 3.6l or newer u would need an entire care as a donor and get very expensive.

Same vintage 3.2l boxter motors can also be used.
Can i use 3.2 boxter engine to replace mine?. I will have to use the air intake and wire from my 996 and will work or is more complicated
​​​​​​
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Old Mar 26, 2021 | 11:09 AM
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Originally Posted by Kgb
Can i use 3.2 boxter engine to replace mine?. I will have to use the air intake and wire from my 996 and will work or is more complicated
​​​​​​
Yes thats why i mentioned it. Blocks r basically the same, but there r some mounting differences on some parts. Sorry i dont know the specifics, but its been done a few times. Google search will be your friend or post a thread with as a new topic title so those that have done it may speak up.
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Old Mar 29, 2021 | 11:03 AM
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Originally Posted by De Jeeper
Yes thats why i mentioned it. Blocks r basically the same, but there r some mounting differences on some parts. Sorry i dont know the specifics, but its been done a few times. Google search will be your friend or post a thread with as a new topic title so those that have done it may speak up.
Thanks a lot . I found an engine m9601 to replace my m9604. It will work with my dme or i will have to reprogram from the beginning.
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Old Mar 29, 2021 | 12:52 PM
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Originally Posted by Kgb
Thanks a lot . I found an engine m9601 to replace my m9604. It will work with my dme or i will have to reprogram from the beginning.

Should. Block and heads r the same. I would swap or buy sensors form your original year and reuse the throttle body. The computer doesnt care about the block or head, just the electronics.
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