better 6.9L
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Posting Guru
Joined: Jul 2006
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From: Cleburne
better 6.9L
OK, yall have told me of one 6.9 better than the other. The later models 6.9 is a better bet to rebuild. I am having trouble explaining to wrecking yards about the pronounced dipstick entry, and the counterbored heat plug hole. They say it is, then I drive over and it isn't. Costing me a lot of leg work. Is there a stamp number on the engine I can go by, or what year did they start making the better version. If they want to make a sale, maybe I can convince them to look at a stamped number before I take another wild goose chase. I live in texas therefore, there is a major language barrier issue with most wrecking yards. Maybe this will help in my quest. Any advise will be greatly appreciated.
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Joined: Nov 2004
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From: Manitoba
Block casting........INTERNATIONAL HARVESTER DIESEL ENGINES
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
The serial numbers can be found on the drivers side (LH) front corner of the center block. Look right behind the oil filler housing on the flat area, triangulated by the head and the valley pan hold down/bolts.
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
The serial numbers can be found on the drivers side (LH) front corner of the center block. Look right behind the oil filler housing on the flat area, triangulated by the head and the valley pan hold down/bolts.
Last edited by PLC7.3; Feb 24, 2007 at 11:14 AM.
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