John Deere B Block

jd2cyl1943 · Nov 23, 2022

Are the John Deere B blocks, B 1305R and B 1783R interchangeable?

wore out · Nov 23, 2022

(quoted from post at 12:05:41 11/23/22) Are the John Deere B blocks, B 1305R and B 1783R interchangeable?

B1305R fits 60,000 to 95,999.

B1783R fits 96,000-.

The cylinder head and gasket parts numbers changed at 96,000, as well, so the blocks are likely NOT directly interchangeable.

That being said, I changed a block many years ago in a styled ''B'', and it sort of worked, (I recall a difference in the rocker oiling) but that's way too long ago to remember all the details.

Old weldor · Nov 23, 2022

Years ago I purchased a 1940 John Deere B, the previous owner could not get it to stop leaking coolant between the block and head! I removed the
head and immediately noticed that the coolant passages didnt match up. The head was for an older unstyled B! I was able to purchase the right head
for it!

JD39B · Nov 23, 2022

Nope. The bores, head stud length/pattern, and other things
are all different. Your tractor needs the 1783 block.

Old weldor · Nov 24, 2022

Years ago I purchased a 1940 John Deere B, the previous owner could not get it to stop leaking coolant between the block and head! I removed the
head and immediately noticed that the coolant passages didnt match up. The head was for an older unstyled B! I was able to purchase the right head
for it!

John Deere B Block

jd2cyl1943

Member

wore out

Well-known Member

Old weldor

Member

JD39B

Member

Old weldor

Member

Similar threads