engine identification
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New User
Joined: Aug 2008
Posts: 12
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From: Northeast Fort Wayne,IN
engine identification
Is there identification stamped onto the block of the 6.9s' that indicates the year of the casting?
I am purchasing a second 6.9 engine that I am planning to rebuild but before I purchase it I would like to know if it is a '83-'84 cast or '85-'88.
I am purchasing a second 6.9 engine that I am planning to rebuild but before I purchase it I would like to know if it is a '83-'84 cast or '85-'88.
Thread Starter
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New User
Joined: Aug 2008
Posts: 12
Likes: 0
From: Northeast Fort Wayne,IN
Thanks for the replies. I will search my heads to see if I can find a number, it might be around the valvetrain. I imagine the freeze plug hole is reinforced in the second generation casting to keep the block from cracking, like 84 did.
Thanks again
Thanks again
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Block casting........INTERNATIONAL HARVESTER DIESEL ENGINES
6.9L and 7.3L Core Identification
6.9L Old Style Block
Block Casting Number:
On left side of block (beneath oil cooler) 1805440C1
Note: Some 440 blocks are truly new style and must be visually inspected by raised donut around the block heater, frost plug (right rear). Old style below serial number 173828.
Visual Identification: *No counter bored area for block heater
*No defined area on side of block for dip stick
*Thickness of cast iron around block heater 3/8" (.375")
Head Bolts: *7/16, 12 point socket is used to torque head bolts
*Block tapped with 7/16-14 for head bolts
6.9L New Style Block
Block Casting Number: 1807996C1 Note: Some new style blocks have casting
number 440. Above serial number 173828.
Visual Identification: *Has counterbored area for block heater
*Very defined relief area cast in side of block for dip stick tube.
*Thickness of cast iron around block heater 15/32" (.470")
*Latest style (not all new style 6.9) has ribs around head bolts, rear two on left side go from head gasket surface to pan rail - same as 7.3
Head Bolts: *Same as old style 6.9
6.9L and 7.3L Core Identification
6.9L Old Style Block
Block Casting Number:
On left side of block (beneath oil cooler) 1805440C1
Note: Some 440 blocks are truly new style and must be visually inspected by raised donut around the block heater, frost plug (right rear). Old style below serial number 173828.
Visual Identification: *No counter bored area for block heater
*No defined area on side of block for dip stick
*Thickness of cast iron around block heater 3/8" (.375")
Head Bolts: *7/16, 12 point socket is used to torque head bolts
*Block tapped with 7/16-14 for head bolts
6.9L New Style Block
Block Casting Number: 1807996C1 Note: Some new style blocks have casting
number 440. Above serial number 173828.
Visual Identification: *Has counterbored area for block heater
*Very defined relief area cast in side of block for dip stick tube.
*Thickness of cast iron around block heater 15/32" (.470")
*Latest style (not all new style 6.9) has ribs around head bolts, rear two on left side go from head gasket surface to pan rail - same as 7.3
Head Bolts: *Same as old style 6.9
Thread Starter
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New User
Joined: Aug 2008
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From: Northeast Fort Wayne,IN
Thanks for the response. The info you gave should help me identify the block.
If the block is towards the end of 1988 what ballpark does the serial numbers go to? This "latest style" of the 6.9 with the ribs around the head bolts I am taking describes the casting of the head, or do the ribs run vertical up and down the block? This should not affect mounting "old style" heads to the new block, right?
If the block is towards the end of 1988 what ballpark does the serial numbers go to? This "latest style" of the 6.9 with the ribs around the head bolts I am taking describes the casting of the head, or do the ribs run vertical up and down the block? This should not affect mounting "old style" heads to the new block, right?
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