Ford 201 diesel 5/69 vs 6/69?

root

Member
Getting ready to rebuild the 4000 and noticed the kits switch between 5/69 and 6/69. Does anyone know what the difference is or what was changed in 69?
 
Somewhere in that time frame Ford changed
the lifters and push rods.
Old style lifters you could pull from the
top.
New style you had to remove the cam and
drop them out the bottom.
Length of push rods is different.
New style should be 12 1/8in long.
Am pretty sure old style is shorter but
don't have one here to measure the length.
 
I thought the cam and lifter change was in '65, not '69. I was going to confer with the parts catalog but couldn't get it to work for me this morning.
 
The 201 received a number of upgrades beginning April 1 68 that included a higher lift cam and head with larger ports for better air flow
The only change I know of for 69 was they went to a slightly thicker head gasket
My search in my old parts book shows the Basildon and Antwerp block D0NN6010L had an additional .012 milled from the top of the block, thus requiring a thicker head gasket
There is no reference to the C7NN block needing the thicker gasket but I figure it's best to go with the thicker gasket than take a chance on having piston to valve contact

I've always been told you can use the 6-69/later head gasket on the older engines but not to use the older gasket on the 69/later engines

No matter what year 201 engine I'm rebuilding I just order a kit for the 6-69/later engine

This post was edited by Destroked 450 on 03/07/2022 at 12:16 pm.
 
Putting a newer thicker head gasket on an older engine will make for a hard starting beast in the cold weather. I would not recommend doing that unless the machine operates primarily in southern states.

In addition, the newer blocks have more meat on the top of deck, not less. This was done to accommodate the thicker head gasket and yet leave the compression ratio unchanged.
 
In addition, the newer blocks have more meat on the top of deck, not less. This was done to accommodate the thicker head gasket and yet leave the compression ratio unchanged.

Your logic seems backwards to me. A thicker head gasket increases the volume of the combustion chamber when the piston is all of the way up because the top of the chamber is higher up, and adding more material to the deck would make it even higher and therefore the combustion chamber would be even larger. You would have to remove material from the deck to set the top of the chamber back down to its original height.
 

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