4020 Tractors
4020 Pistons
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I have four Pistons for what I believe to be a 4010 or 4020. However, I cannot seem to confirm that by surfing the Internet. They were definately made in Waterloo. The bottom right hand corner of the break-in instructions has “JDWTWks.” printed. The boxes all have the same label with “AR 51800 PISTON 30521”. It’s all orginal to the packaging. If any one can shed some light on what I have, I’d appreciate it.
4010’s had smaller pistons in them. my 4010 got recalled to the dealer and they put 4020 pistons and liners in it for some unforseen reason. 4020’s 404 CID engine had 4 1/4″ bore and the 4010’s 380 CID engine had 4/18″ pistons. that is if theyre diesel pistons. also a good way to determine what pistons they are is the 4010 pistons have an extra oil control ring groove at the very bottom of the piston (underneath the wristpin hole) and the 4020 piston does not.
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