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John Deere Tractors Discussion Forum

Late 4020 blocks

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03-15-2011 19:25:24

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Hi- need some help with a late 4020 that is for sale, its a mid 1970 model everything looks correct for the year except the engine block.No weep holes but it does not have that large plug on the left side of the block, just a smaller pipe threaded plug- does this sound like the factory correct block for the year?--- Thanks for the help!!!

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03-16-2011 06:35:11

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 Re: Late 4020 blocks in reply to DHM in KS, 03-15-2011 19:25:24  
The weep hole were eliminated on the late 4020 blocks. The ventalator pump was also eliminated.

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03-16-2011 04:53:13

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 Re: Late 4020 blocks in reply to DHM in KS, 03-15-2011 19:25:24  
If its a 71/72 you can see on the left side where the air conditioner compressor mounts.The 71/72 also used a block heater on left side where the 69/70 had a tank heater on right side but of course some dont have heaters at all and 40 year old tractors can have a long story to tell.

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Tx Jim

03-16-2011 03:58:58

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 Re: Late 4020 blocks in reply to buickanddeere, 03-15-2011 19:25:24  
Here are the block casting # and serial number break for late model 4020's
< - 280000 (C) (MARKED R40610 OR R40620) (NLA)
< - 280000 (C) (MARKED R45950) (NLA) (AIR CONDITIONING)
> 280001 - (C) (MARKED R47170 OR R48440) (NLA)

This is the only plug I see on LH side of the block
AR80294 PLUG 1 280001 - (SUB FOR R47092)

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