John and Kathy Boehm
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Engine Parts for Dubuque Tractors: John Deere 420, 430, 440






T10474T (AT10394T) block from a running tractor with all internal parts, including M3114T crankshaft, M3043T pistons, M1691T conncting rods, M3156T camshaft with M49T cam gear, AM3014T oil pump, and oil pan. $750. Pick up here or ask for shipping quote via truck freight.

To view the running engine before disassembly, here is a video:



AM3015T Oil line with nuts, $8
AM234T elbow nut nut, $5
AM235T straight connector, $5
Entire set, $15

AM2780T Drain cock, two available, $9


Complete rocker arm assembly, good condition, $80

Valve cover studs (one has the special cut on the threaded area, very nice condition, $12/pair


M49T camshaft gear and M3156T camshaft, $40 (G)

AM3015T Oil line, with nuts, $12

M285T Head bolt, $2 each; set of 7, $10

L768T Crankshaft oil slinger, $9 (G)


M3112T crankshaft pulley, $40, your choice

M3113T (M4150T) Crank jaw, $25 (M)

Good used belts, crankshaft pulley to fan pulley and fan pulley to generator, $10/pair

Flywheel with ring gear, $60

Flywheel guard, $20

AM902T Front engine cover, $16

L4115T Cover for front end of crankshaft, $10

M18T Cover for rear main seal, $10

Timing mark cover, $5

M3298T plug, $8

M3295T Gvoernor to carburetor rod, $19 (MJB or G)

T13883T (M3123T) Governor connecting rod, $10

L4197T spring, $11

Throttle rod for M4319T housing, $20

T10294T Throttle lever, $18


Throttle parts from a 440I, may fit 430 and slant dash 420, good universal joing, bracket has a welded repair, $75

M98T oil return pipe, $12

AM230T Screen for oil pump, $20

Oil filter, M59T base with AM236T case and missing bottom sealing plate, $20

AM1788T oil pan, $25

AM2840T fan blade, $20

M3059T Radiator support bracket, $12


Two views of a 420/430/440 water pump that is sold as-is as a core or for you to rebuild, $25

M3111T part on fan hub, $15


M3106T Upper water pipe, $25

M3039T water pipe, $20

M4065T upper water pipe with thermostat housing cover, $25, your choice

Thermostat, $10

T421T Thermostate cover, $10

Drain plug, $2

Drain plug, $7

M3066T, valve cover gasket, $13

Various gaskets, $4 each