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Unread 07-15-2013, 08:37 AM   #1
scuba303
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1998 ZJ 
 
Join Date: Jan 2012
Location: hannover, nds
Posts: 12
any way to check the production date of an engine?

hi. we recently swapped an 5.2 engine. 93 preface lift vehicle. got a facelift engine. well, was bought as preface lift engine. now we got some problems like finding the right engine pressure sending unit/switch. seems like this part has changed from year to year with facelift cherokees. so is there any way to determine the year of made from the engine itself? like any serial number of engine which we might can track down?

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Unread 07-15-2013, 11:35 AM   #2
CatSplat
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There's a date cast into the block. If I remember correctly, it's on the driver's side near the motor mount.
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Unread 07-15-2013, 11:35 AM   #3
AVR2
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Of course ZJ engines have serial numbers. According to the FSM, the 5.2L serial number is "stamped into a machined pad located on the left front corner of the cylinder block".

This is how you decode the number:
zj-engine-code.jpg

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Unread 07-15-2013, 11:49 AM   #4
scuba303
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thanks! going to check it tomorrow! great help!!!
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Unread 08-07-2015, 08:33 PM   #5
wingless
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Quote:
Originally Posted by AVR2 View Post
Of course ZJ engines have serial numbers. According to the FSM, the 5.2L serial number is "stamped into a machined pad located on the left front corner of the cylinder block".

This is how you decode the number:

The FSM for my 1994 ZJ has that identical published information.

When I pulled my engine the stamped number was not visible. All I could see was two deteriorated labels, one on an upward-facing cast flat pad on the driver's side of the distributor, the other on the driver's side of the oil pan, near the top.

There was also a cast number on the block. The number is: 53006714 318 28. It is cast on the driver's side, above the freeze plugs, about 1" from the cylinder head.

When I used a utility knife blade to scrape the engine block clean, forward of cylinder 1, up near the rocker cover, on the flat surface, the stamped serial number was revealed. Mine does not conform to that published sequence. My vehicle was built new to my order, I picked it up at the dealership and owned it through the entire 21 years, so I know this is the engine installed by the factory.

My stamped engine serial number is: 4M318 04190282. The last eight do not match the last eight of my VIN.


Stamped Engine Serial Number


Label Near Distributor


Oil Pan Label


Cast Block Number
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Unread 08-08-2015, 02:30 PM   #6
wingless
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Quote:
Originally Posted by wingless View Post
The FSM for my 1994 ZJ has that identical published information.

When I pulled my engine the stamped number was not visible. All I could see was two deteriorated labels, one on an upward-facing cast flat pad on the driver's side of the distributor, the other on the driver's side of the oil pan, near the top.

There was also a cast number on the block. The number is: 53006714 318 28. It is cast on the driver's side, above the freeze plugs, about 1" from the cylinder head.

When I used a utility knife blade to scrape the engine block clean, forward of cylinder 1, up near the rocker cover, on the flat surface, the stamped serial number was revealed. Mine does not conform to that published sequence. My vehicle was built new to my order, I picked it up at the dealership and owned it through the entire 21 years, so I know this is the engine installed by the factory.

My stamped engine serial number is: 4M318 04190282. The last eight do not match the last eight of my VIN.


Stamped Engine Serial Number


Label Near Distributor


Oil Pan Label


Cast Block Number
This image shows the engine block casting date, cast into the block, on the passenger side, above the freeze plugs.

There is a date, plus two pointers. One pointer has two positions: "D" and "N", mine is pointed at "N". The other pointer has eight positions, each w/ a dot. Assuming a clock-style numbering, mine is pointed down, to position number 4.


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