John Deere Parts for Engines:-Engine Overhaul Kits| Crankshafts | Injectors| Cylinder Head | Water Pump | Valve Train Kit | Oil Pump | Gasket Sets
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John Deere Parts for 6303 Engine. O Rings on Liner. Engine Serial Number less Than (<)158975Notes. The 6303 engine is part of the 300 Series John Deere Engines manufactured in Saran, France and in Dubuque in Iowa, USA.For serial numbers less that 158975, the liner o rings are fixed on the liners. This is a 6 cylinder engine, with a bore of 3.86 inches (98mm), and a piston pin diameter of 1.185 inches (30mm). The engine block will have casting numbers of T24963 or T24968, and the connecting rods will have casting numbers of T20007 or R81410.
This engine is found on John Deere 544 Wheel Loader.
Major Part Description Sub Component Description Part Number Part Contents and Description John Deere Engine Overhaul Kits Complete Engine Overhaul Kit OK6481 Comes with Pistons, Pins, Pin Retainers, Rings, Liners, Liner O Rings, Cam Shaft bushings, Main Bearings, Thrust Bearings, Con Rod Bearings, Rear & Front Crank Seal, Complete Gasket Set, cap screws and injector grommets. In frame Overhaul Kit IK6481 Comes with Pistons, Pins, Pin Retainers, Rings, Liners, Liner O Rings, Main Bearings, Thrust Bearings, Con Rod Bearings, head gasket set, oil pan gasket & cap screws. John Deere Engine Parts Piston Liner Kit PLK481 Consists of
Pistons T23481
Rings AR70633
Piston Pins T23482
Liners AR51902
Piston Pin Retainers R51112Main Bearing RE27352 Standard RE27353 0.010 Oversize RE27360 0.020 Oversize RE27368 0.030 Oversize Thrust Bearing AT21139 Standard AT21132 0.010 Oversize AT21134 0.020 Oversize AT21136 0.030 Oversize Con Rod Bearings RE27348 Standard RE27349 0.010 Oversize RE27358 0.020 Oversize RE27364 0.030 Oversize John Deere Crankshaft Kit Front Seal AR67942 Rear Seal RE44574 Do not use with flywheel housing (m) T20300, T22991 Crankshaft AT22562 Crankshaft Gear T20094 Ring Gear R114282 142 teeth John Deere Gasket Set O/H Gasket Set RE38568 Head Gasket Set RE38571 Head Gasket R98462 Oil Pan Gasket R97344 Rocker Cover Gasket R75728 John Deere Con Rods Parts Con Rod Bush T23471 x6 Con Rod Bolt R74194 x12 Use R74194 with Con Rod (m) T20007; use R80033 with Con Rod (m) R18410 Camshaft R82821 Threaded type. Con Rod AT18005 John Deere Oil Pump Parts Oil Pump RE55343 Oil Cooler RE31929 Rocker Arm RE31973 Rocker Shaft R54986 Oil Tube Pump R113752 John Deere Engine Gears Lower Gear AT24252 Lower Bushing T26321 Upper Gear AT18009 Upper Bushing T20034 Cam Follower T20073 Cam Gear T20070 John Deere Valve Train Parts Intake Valve R97623 Standard R79628 0.03 oversize R79629 0.015 oversize Exhaust Valve R79624 Standard R79625 0.03 oversize R79626 0.015 oversize Intake Valve Insert R73064 Standard Exhaust Valve Insert R51734 Standard Valve Cap T20129 Valve Lock T20077 Spring Valve R26125 Rotator Valve RE11410 O’ring Valve R87627 Other John Deere Engine Parts Thermostat AR70601 180oF Verify JD Parts manual. AR77411 195oF Verify JD Parts manual. Fuel Transfer Pump RE42211 Water Pump Repair Kit RE19510 Water pump Kit has no Impeller TMX132 Water Pump Kit has Impeller Injector Pencil AR89564 Seal R60746 R48000 John Deere Parts for 6303 Engine. O Rings on Block. Engine Serial Number more than (>)158976
| Notes. The 6303 engine is part of the 300 Series John Deere Engines manufactured in Saran, France and in Dubuque in Iowa, USA. For serial numbers less that 154865, the liner o rings are fixed on the liners. This is a 6 cylinder engine, with a bore of 3.86 inches (98mm), and a piston pin diameter of 1.185 inches (30mm).
The engine block will have casting numbers of R53260, R55035, R55351, R72970, R79280, T32346, and the connecting rods will have casting numbers of T20007 or R81410. This engine is found on John Deere 3420 Tractors, 540 wheel loader, and 544 skidder. |
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| Major Part Description | Sub Component Description | Part Number | Part Contents and Description |
| John Deere Engine Overhaul Kits | Complete Engine Overhaul Kit | OK6591 | Comes with Pistons, Pins, Pin Retainers, Rings, Liners, Liner O Rings, Cam Shaft bushings, Main Bearings, Thrust Bearings, Con Rod Bearings, Rear & Front Crank Seal, Complete Gasket Set, cap screws and injector grommets. |
| In frame Overhaul Kit | IK6591 | Comes with Pistons, Pins, Pin Retainers, Rings, Liners, Liner O Rings, Main Bearings, Thrust Bearings, Con Rod Bearings, head gasket set, oil pan gasket & cap screws. | |
| John Deere Engine Parts | Piston Liner Kit | AR71591 | Consists of Pistons T23481 Rings AR70633 Piston Pins T23482 T32340 Liners AR71617 Piston Pin Retainers R51112 |
| Main Bearing | RE27352 | Standard | |
| RE27353 | 0.010 Oversize | ||
| RE27360 | 0.020 Oversize | ||
| RE27368 | 0.030 Oversize | ||
| Thrust Bearing | AT21139 | Standard | |
| AT21132 | 0.010 Oversize | ||
| AT21134 | 0.020 Oversize | ||
| AT21136 | 0.030 Oversize | ||
| Con Rod Bearings | RE27348 | Standard | |
| RE27349 | 0.010 Oversize | ||
| RE27358 | 0.020 Oversize | ||
| RE27364 | 0.030 Oversize | ||
| John Deere Crankshaft Kit | Front Seal | AR67942 | |
| Rear Seal | RE44574 | Do not use with flywheel housing (m) T20300, T22991 | |
| Crankshaft | AT22562 | ||
| Crankshaft Gear | T20094 | ||
| Ring Gear | R114282 | 142 teeth | |
| John Deere Gasket Set | O/H Gasket Set | RE38568 | |
| Head Gasket Set | RE38571 | ||
| Head Gasket | R98462 | ||
| Oil Pan Gasket | R97344 | ||
| Rocker Cover Gasket | R75728 | ||
| John Deere Con Rods Parts | Con Rod Bush | T23471 | x6 |
| Con Rod Bolt | R74194 | x12 Use R74194 with Con Rod (m) T20007; use R80033 with Con Rod (m) R18410 | |
| Camshaft | R82821 | Threaded type. | |
| Con Rod | AT18005 | ||
| John Deere Oil Pump Parts | Oil Pump | RE55343 | |
| Oil Cooler | RE31929 | ||
| Rocker Arm | RE31973 | ||
| Rocker Shaft | R54986 | ||
| Oil Tube Pump | R113752 | ||
| John Deere Engine Gears | Lower Gear | AT24252 | |
| Lower Bushing | T26321 | ||
| Upper Gear | AT18009 | ||
| Upper Bushing | T20034 | ||
| Cam Follower | T20073 | ||
| Cam Gear | T20070 | ||
| John Deere Valve Train Parts | Intake Valve | R97623 | Standard |
| R79628 | 0.03 oversize | ||
| R79629 | 0.015 oversize | ||
| Exhaust Valve | R79624 | Standard | |
| R79625 | 0.03 oversize | ||
| R79626 | 0.015 oversize | ||
| Intake Valve Insert | R73064 | Standard | |
| Exhaust Valve Insert | R51734 | Standard | |
| Valve Cap | T20129 | ||
| Valve Lock | T20077 | ||
| Spring Valve | R26125 | ||
| Rotator Valve | RE11410 | ||
| O’ring Valve | R87627 | ||
| Other John Deere Engine Parts | Thermostat | AR70601 | 180oF Verify JD Parts manual. |
| AR77411 | 195oF Verify JD Parts manual. | ||
| Fuel Transfer Pump | RE42211 | ||
| Water Pump Repair Kit | RE19510 | Water pump Kit has no Impeller | |
| TMX132 | Water Pump Kit has Impeller | ||
| Injector Pencil | AR89564 | ||
| Seal | R60746 | ||
| R48000 | |||