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Parts for Cummins 4BT 3.9 and 6BT 5.9 Engines

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Cummins 4BT/6BT Parts

We carry a wide selection of parts including alternators, starters, hoses, and fans for Cummins 4BT 3.9 and 6BT 5.9 diesel engines.

If you need any help finding a part, please use our quote request form or call us at 855.470.3525: our knowledgeable inside sales staff will promptly assist you.


THERMOSTAT (180°F / 82°C) - 6BTA5.9-G3 / B4.5 / B5.9-M220 / 6B5.9 / 4B3.9

Use with DS-3923331 Seal

  • $26.73
    • $26.73
    Qty: 

    OIL PAN - 4BT

    Use with DS3938162 Oil Pan Gasket

  • $97.08
    • $97.08
    Qty: 

    LONG BLOCK - 6BT

  • $7,159.83
    • $7,159.83
    Qty: 

    FUEL MANIFOLD

  • $78.16
    • $78.16
    Qty: 

    LONG BLOCK - 4BT

  • $6,270.40
    • $6,270.40
    Qty: 

    SEALING WASHER - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9 / QSB4.5

  • $1.56
    • $1.56
    Qty: 

    TURBO MOUNTING STUD - ISC350 / C8.3-C215 / B5.9 / 6C8.3 / ISB-RV275 / ISC300 / C8.3-P

  • $6.70
    • $6.70
    Qty: 

    SALVAGE SLEEVE - B3.9-V110 / QSB5.9480H0 / B5.9-M330 / 6B5.9 / B5.9-C / 4B3.9

  • $24.61
    • $24.61
    Qty: 

    THERMOSTAT SEAL - B5.9M / B160 / 6B5.9 / B5.9-M220 / QSB4.5 / B3.9-M250 / QSB-110C

  • $3.17
    • $3.17
    Qty: 

    INJECTOR SEAL RING - B5.9M / 6B5.9 / 4BT3.9-C100 / B5.9-175

  • $0.55
    • $0.55
    Qty: 

    RECTANGULAR RING SEAL - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9

  • $0.67
    • $0.67
    Qty: 

    RECTANGULAR RING SEAL - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9

  • $0.95
    • $0.95
    Qty: 

    SEAL RING - 4B3.9 / 6BT5.9

  • $0.56
    • $0.56
    Qty: 

    FLYWHEEL RING GEAR - 4B 3.9 / B 4.5 / 6B 5.9 / ISB 6.7

  • $54.63
    • $54.63
    Qty: 

    FLYWHEEL RING GEAR - 4B3.9 / 6B5.9 / ISB6.7 / QSB5.9 / 6C8.3 / QSC8.3 (138 TEETH)

  • $83.03
    • $83.03
    Qty: 

    RETURN LINE GASKET - C8.3-250 / B5.9M / QSB5.9 / 6B5.9 / B3.9 130 / C8.3GEN

  • $1.04
    • $1.04
    Qty: 

    FAN PULLEY - ISB / QSB

  • $32.89
    • $32.89
    Qty: 

    FAN PULLEY - ISB / QSB / ISC / QSC

  • $56.71
    • $56.71
    Qty: 

    EXPANSION PLUG - B5.9 / 6B5.9 / 4BT3.9 / B3.9-C80 / B3.9-M250 / C8.3-275 / 4BTA3.9

  • $1.24
    • $1.24
    Qty: 

    THREADED PLUG - 6B5.9 / B5.9 / ISB3.9 / ISB4.5 / ISB5.9G / ISB6.7 / QSB3.9

    Genuine Cummins Part

  • $15.04
    • $15.04
    Qty: 

    BUSHING - QSB4 / 6B5.9 / B5.9-M330 / QSB6.7 / QSB4.5 / B5.9-C / B3.9-C76

  • $7.90
    • $7.90
    Qty: 

    PISTON BODY - 4B3.9 / B4.5 / B5.9 / B6.7 / ISB6.7 / QSB5.9

    17.5:1, .50 MM O/S, WITHOUT PIN

  • $74.26
    • $74.26
    Qty: 

    TURBO MOUNTING STUD NUT - ISB240 / 6B5.9 / ISB / ISC350

    Genuine Cummins Part

  • $4.60
    • $4.60
    Qty: 

    HEXAGON NUT - C8.3-C215 / B5.9-M210 / ISB-RV275 / ISC350 / C8.3-P / QSB6.7

  • $1.91
    • $1.91
    Qty: 

    NOISE ISOLATOR - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9 / QSB4.5

  • $1.38
    • $1.38
    Qty: 

    FRONT GEAR HOUSING - ISB / QSC / KTA38 / QSK38

  • $260.37
    • $260.37
    Qty: 

    FLYWHEEL RING GEAR - 4B 3.9 / B 4.5 / 6B 5.9 / ISB 6.7

    Genuine Cummins Part

  • $192.73
    • $192.73
    Qty: 

    PUSH ROD COVER GASKET - 4B3.9 / B4.5 / QSB4.5 / B3.9-C130

  • $10.98
    • $10.98
    Qty: 

    OIL FILTER HEAD GASKET - QSB5.9 / B3.9 / BT5.9GEN.DR6 / 6B5.9 / 4B3.9

  • $9.58
    • $9.58
    Qty: 

    GEAR COVER GASKET - QSB-110C / B3.9-C80 / 4B3.9 / B5.9 / 6B5.9 / 4BT3.9

  • $16.71
    • $16.71
    Qty: 

    FUEL SUPPLY PUMP GASKET - B3.9-C80 / B3.9 / 6C8.3 / B3.9-P / 6B5.9 / B4.5

  • $2.23
    • $2.23
    Qty: 

    GASKET

  • $4.48
    • $4.48
    Qty: 

    GASKET - BT5.9 / 4B3.9 / 6B5.9

  • $8.19
    • $8.19
    Qty: 

    FRONT GEAR COVER GASKET

  • $26.16
    • $26.16
    Qty: 

    EXHAUST MANIFOLD BOLT - ISB / ISC / 6B5.9

    Genuine Cummins Part

  • $5.54
    • $5.54
    Qty: 

    VIBRATION DAMPER - 4BT / 6BT / ISB 6.7L (8.23" DIAMETER, RUBBER, 4 HOLES)

  • $78.95
    • $78.95
    Qty: 

    UNLOADER VALVE CAP - ISB / ISC / QSC

  • $35.35
    • $35.35
    Qty: 

    FAN SUPPORT BALL BEARING

  • $88.90
    • $88.90
    Qty: 

    FUEL INJECTOR PRELOAD TORQUE WRENCH - KTA19 / QSK19 / ISB / 4BT 3.9

    Genuine Cummins Part

  • $134.03
    • $134.03
    Qty: 

    SEALING WASHER - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9 / QSB4.5

    Genuine Cummins Part

  • $5.68
    • $5.68
    Qty: 

    FUEL SUPPLY TUBE - 4B3.9 / ISB / QSB3.9 / QSB4.5

    Genuine Cummins Part

  • $95.33
    • $95.33
    Qty: 

    EXHAUST OUTLET TUBE - 4BT3.9 / 6BT5.9 / ISB3.9 / QSB3.9 / QSB4.5

    Genuine Cummins Part

  • $162.92
    • $162.92
    Qty: 

    ALTERNATOR SUPPORT - 4B3.10 / 6B5.10 / ISB3.9 / ISB4.5 / QSB3.9 / QSB4.5

    Genuine Cummins Part

  • $76.38
    • $76.38
    Qty: 

    MOUNTING SPACER - ISC350 / ISL400 / ISLG320 / QSB6.7 / ISC330 / ISB / B5.9-A200

    Genuine Cummins Part

  • $8.40
    • $8.40
    Qty: 

    MAIN BEARING SET (STANDARD) - B SERIES

    Surplus Item – Special Price Genuine Cummins Part

  • $129.45
    • $129.45
    Qty: 

    SPEED INDICATOR RING - 4B3.9 / 6B5.9 / ISB6.7 / QSB5.9

    Genuine Cummins Part

  • $92.90
    • $92.90
    Qty: 

    SPEED INDICATOR RING - 4B3.9 / 6B5.9 / 6C8.3 / ISC8.3 / QSC8.3 / QSB5.9

    Genuine Cummins Part

  • $88.22
    • $88.22
    Qty: 

    INJECTOR REMOVER - B / C SERIES

    Genuine Cummins Part

  • $220.68
    • $220.68
    Qty: 

    IDLER PULLEY - ISB / QSB

    Genuine Cummins Part

  • $160.21
    • $160.21
    Qty: 

    IDLER PULLEY - ISB / QSB / ISC / QSC

    Genuine Cummins Part

  • $191.02
    • $191.02
    Qty: 

    FAN PULLEY - B Series / ISB / QSB / 6CTA / ISC / QSC

    Genuine Cummins Part

  • $94.86
    • $94.86
    Qty: 

    FAN PULLEY - ISB / QSB

    Genuine Cummins Part

  • $93.55
    • $93.55
    Qty: 

    CRANKSHAFT PULLEY - ISB / QSB / ISC / QSC

    Genuine Cummins Part

  • $87.14
    • $87.14
    Qty: 

    ZINC ELECTRODE PLUG - ISM / QSM / ISB / QSB / ISB

    Genuine Cummins Part

  • $39.43
    • $39.43
    Qty: 

    PISTON PIN - NH220 / NH250 / NT855 / ISB / QSB / ISB

    Genuine Cummins Part

  • $44.78
    • $44.78
    Qty: 

    OIL PAN - 4B3.9 / 6B5.9 / B4.5 / B6.7 / ISB6.7 / QSB4.5 (STAMPED STEEL)

    Genuine Cummins Part

  • $241.17
    • $241.17
    Qty: 

    STARTER - 4B3.9 / B4.5 / B6.7 / ISB6.7 / QSB4.5 / QSB5.9 (12 V)

    Genuine Cummins Part

  • $651.32
    • $651.32
    Qty: 

    LOW ENGINE SPEED CUTOFF

    Genuine Cummins Part

  • $978.80
    • $978.80
    Qty: 

    STATOR REPAIR KIT - 4B3.9 / B4.5 / B5.9 / B6.7 / ISB6.7 / QSB

    Genuine Cummins Part

  • $130.45
    • $130.45
    Qty: 

    VACUUM PUMP REPAIR KIT - 4B3.9 / 6B5.9 / ISB / ISD

    Genuine Cummins Part

  • $23.08
    • $23.08
    Qty: 

    TAPPET REMOVAL KIT - ISB / QSB

    Genuine Cummins Part

  • $355.70
    • $355.70
    Qty: 

    VIBRATION ISOLATOR - ISB / QSB / ISC / QSC

    Genuine Cummins Part

  • $348.66
    • $348.66
    Qty: 

    VIBRATION ISOLATOR - ISB / QSB

    Genuine Cummins Part

  • $271.68
    • $271.68
    Qty: 

    VIBRATION ISOLATOR - ISB / QSB / ISC / QSC

    Genuine Cummins Part

  • $12.48
    • $12.48
    Qty: 

    CRANKSHAFT FRONT WEAR SLEEVE INSTALLER

    Genuine Cummins Part

  • $147.62
    • $147.62
    Qty: 

    CRANKSHAFT REAR WEAR SLEEVE INSTALLER - ISB / QSB

    Genuine Cummins Part

  • $186.35
    • $186.35
    Qty: 

    RESTRICTION INDICATOR - ISB / NH220 / NH250 / NT855

    Genuine Cummins Part

  • $92.66
    • $92.66
    Qty: 

    PLAIN HOSE - ISB

    Genuine Cummins Part

  • $21.57
    • $21.57
    Qty: 

    PLAIN HOSE - ISB / ISC / QSC

    Genuine Cummins Part

  • $65.73
    • $65.73
    Qty: 

    PLAIN HOSE

    Genuine Cummins Part

  • $17.45
    • $17.45
    Qty: 

    PLAIN HOSE

    Genuine Cummins Part

  • $40.63
    • $40.63
    Qty: 

    MOLDED HOSE - ISB / ISC / QSC

    Genuine Cummins Part

  • $32.36
    • $32.36
    Qty: 

    MOLDED HOSE - ISB

    Genuine Cummins Part

  • $41.35
    • $41.35
    Qty: 

    FLEXIBLE HOSE - ISB

    Genuine Cummins Part

  • $136.49
    • $136.49
    Qty: 

    FLEXIBLE HOSE - ISB

    Genuine Cummins Part

  • $51.44
    • $51.44
    Qty: 

    FLEXIBLE HOSE - ISB / ISC / QSC

    Genuine Cummins Part

  • $141.63
    • $141.63
    Qty: 

    FLEXIBLE HOSE

    Genuine Cummins Part

  • $134.59
    • $134.59
    Qty: 

    FLEXIBLE HOSE

    Genuine Cummins Part

  • $66.48
    • $66.48
    Qty: 

    FLEXIBLE HOSE - ISB / QSB

    Genuine Cummins Part

  • $77.62
    • $77.62
    Qty: 

    FLEXIBLE HOSE - ISB

    Genuine Cummins Part

  • $73.79
    • $73.79
    Qty: 

    FLEXIBLE HOSE - ISB

    Genuine Cummins Part

  • $268.18
    • $268.18
    Qty: 

    ELBOW HOSE - ISB

    Genuine Cummins Part

  • $37.43
    • $37.43
    Qty: 

    ELBOW HOSE - ISB

    Genuine Cummins Part

  • $43.37
    • $43.37
    Qty: 

    ELBOW HOSE - ISB

    Genuine Cummins Part

  • $39.23
    • $39.23
    Qty: 

    ELBOW HOSE - ISB

    Genuine Cummins Part

  • $49.23
    • $49.23
    Qty: 

    ENGINE HEATER - 4B3.9 / B4.5 / B5.9 / B6.7 / ISB6.7 / QSB

    Genuine Cummins Part

  • $1,911.59
    • $1,911.59
    Qty: 

    INTAKE AIR HEATER - 4B3.9 / B4.5 / B5.9 / B6.7 / ISB6.7 / QSB

    Genuine Cummins Part

  • $353.10
    • $353.10
    Qty: 

    WIRING HARNESS - ISB

    Genuine Cummins Part

  • $98.41
    • $98.41
    Qty: 

    WIRING HARNESS - ISB

    Genuine Cummins Part

  • $381.84
    • $381.84
    Qty: 

    WIRING HARNESS - ISB

    Genuine Cummins Part

  • $743.90
    • $743.90
    Qty: 

    FLYWHEEL RING GEAR - 4B3.9 / 6B5.9 / B4.5 / B5.9 / B6.7 / ISB6.7

    Genuine Cummins Part

  • $201.98
    • $201.98
    Qty: 

    FLYWHEEL RING GEAR  - 4B3.9 / 6B5.9 / 6C8.3 (138 TEETH)

    Genuine Cummins Part

  • $222.68
    • $222.68
    Qty: 

    TEMPERATURE GAUGE - B SERIES / ISB

    Genuine Cummins Part

  • $401.34
    • $401.34
    Qty: 

    PUSH ROD COVER GASKET - ISB

    Genuine Cummins Part

  • $32.34
    • $32.34
    Qty: 

    HEAT EXCHANGER GASKET - 4BT3.9 / 6BT / B4.5 / B5.9 / ISB3.9 / ISB4.5 / QSB3.9

    Genuine Cummins Part

  • $14.55
    • $14.55
    Qty: 

    EXHAUST OUTLET CONNECTION GASKET - 4BT3.9 / 6BT5.9 / ISB3.9 / QSB3.9

    Genuine Cummins Part

  • $17.84
    • $17.84
    Qty: 

    COVER PLATE GASKET - 4BT3.9 / 6BT / ISB3.9 / ISB4.5 / QSB3.9 / QSB4.5

    Genuine Cummins Part

  • $6.05
    • $6.05
    Qty: 

    ENGINE FAN - 4BT / 6BT / ISB 6.7L (SUCKER TYPE, 20" DIAMETER, 10 BLADES, PLASTIC)

    Genuine Cummins Part

  • $420.61
    • $420.61
    Qty: 

    ENGINE FAN - 4BT / 6BT / 6CTA 8.3L / ISB 6.7L

    SUCKER TYPE, 21" DIAMETER, 10 BLADES, PLASTIC
    Genuine Cummins Part

  • $423.55
    • $423.55
    Qty: 

    ENGINE FAN - 4BT / 6BT / ISB 6.7L (SUCKER TYPE, 22" DIAMETER, 6 BLADES, METAL)

    Genuine Cummins Part

  • $448.52
    • $448.52
    Qty: 
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