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Unread 03-20-2010, 01:45 PM   #1
bigmatt
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4.0l serial number location

I am looking for the engine serial number.I have the build number off of the motor(006mx05),Is that the serial number?or is there another number i should be looking for?

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Unread 03-20-2010, 02:23 PM   #2
CJ7-Tim
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All 4.0L have a casting number cast into them on the drivers side near the motor mount bracket. XJ engine blocks also have a build date number identifying when the bare block was built into an engine.


Block Casting Numbers

Year............Casting No
1987-90......53005535 (8933002665)
1991-95......53008405
1996-98......53020569
1999-04......53010449


I have read in other threads that stamped on the block about halfway up above the starter should be the vin # of the Jeep..........


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Unread 03-20-2010, 02:36 PM   #3
bigmatt
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Thanks
I will have a look
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91yj 4 banger, 265,000 miles,100% stock ,bought it new.NOW SOLD,

03 TJ sport, stock 4.0.dana 44 ,red w/black hardtop

2001 XJ Sport, stock 4.0L 130.000miles,soon to have new motor.)0331 head issue.
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Unread 06-10-2010, 12:15 PM   #4
barflyfisherman
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Block casting number - 4.0 HO block

Does anyone know if the blocks for the HO 4.0L engines had a separate casting number? I know that heads had different casting numbers.

I was wondering if the blocks did too, due to some minor internal modifications (such as the girdles to reinforce the crankshaft mains).
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Unread 06-10-2010, 02:40 PM   #5
CJ7-Tim
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Quote:
Originally Posted by barflyfisherman View Post
Does anyone know if the blocks for the HO 4.0L engines had a separate casting number?

The block casting numbers are posted above.
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Unread 08-22-2014, 02:57 PM   #6
Wilmingtonite
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Is the block casting # the same as the "motor number"?
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