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Caterpillar 3406 (3406A, 3406B, 3406C) Truck & Equipment Data Sheet

Engine Information
Cubic Inches
Liters
Number of Cylinders
Bore Size
Stroke
Compression Ratio
Engine Torque Specs
Rod Bearing Torque
Main Bearing Torque
Cylinder Head Torque
Firing Order
Intake Valve Lash
Exhaust Valve Lash
Piston Compression Ratios
6N4126
7E0292
7E0539
7E8656
7E8700
7N3509
7N3633
9Y4004
9Y3116
9Y7212 (7N3511)
9Y9889 (7C3406)
1010016
1168154
1175063
1723280
1601131

Caterpillar 3406 Torque Specs

Cat 3406 Torque Specs Cat 3406B Torque Specs Cat 3406C Torque Specs

Caterpillar 3406 Cylinder Head Torque Sequence

Caterpillar 3406 Head Torque Sequence


For cylinder block deck inspection criteria and proper liner protrusion refer to the appropriate OEM service information or the OEM block joint repair procedure (SEHS9564-1).


Connecting Rod Identification

Part Number 9Y6054 (Casting 9Y6048)
Housing Bore: 3.7869-3.7879"
Pin Bore: 1.9998"

Part Number 9Y6054 (Casting 9Y6048) Uses Bolt without Nut
Housing Bore: 3.7869-3.7879"
Pin Bore: 2.1654"
Torque: 60-72 ft/lbs + 85-95 Degrees

Part Number 7E5996 (Casting 9Y6048) - Uses Bolt without Nut - Replaced by 8N1726
Housing Bore: 3.7869-3.7879"
Pin Bore: 1.9998"
Torque: 60-72 ft/lbs + 85-95 Degrees

Part Number 9Y6400 (Casting 7E0034) - Uses through bolt with nut.
Housing Bore: 3.7869-3.7879"
Pin Bore: 1.9998"
Torque: 54-66 ft/lbs + 115-125 Degrees

Part Number 8N1726 (Casting 8N1727) - Uses 9/16" bolts w/ nut.
Housing Bore: 4.0743-4.0753"
Pin Bore: 1.9998" (Wide Taper)
Torque: 54-66 ft/lbs + 115-125 Degrees


Piston Orientation


Many aftermarket pistons are unidirectional. This means they usually can go either way on the connecting rod. If your piston has a V stamped on the head, align it with the V stamped on the block deck.

Connecting Rod Orientation

Align the numbers stamped on the side of the rod and cap towards the inspection opening.


Serial Number Prefixes

1LS - 3406C Gen Set Engine
1RK - 3406 Gas Engine (G3406)
1SS - 3406 Marine Engine
2AM - 3406C Gen Set Engine
2EK - 3406B Truck Engine
2MZ - 3406C Industrial Engine
2WB - 3406B Gen Set Engine
3ER - 3406C Industrial Engine
3ZJ - 3406B Truck Engine (Late Serials are 3406C)
4BM - 3406C Gen Set Engine
4CK - 3406B Truck Engine (Late Serials are 3406C)
4FD - 3406 Gas Engine
4JK - 3406B Gen Set Engine (Late Serials are 3406C)
4MG - 3406B Truck Engine
4PM - 3406B Gen Set Engine
4RG - 3406B Gen Set Engine (Late Serials are 3406C)
4TB - 3406B Marine Engine
4ZR - 3406C Gen Set Engine
5KJ - 3406B Truck Engine (Late Serials are 3406C)
5MW - 3406 Industrial Engine
5YG - 3406B Truck Engine
6TB - 3406B Industrial Engine
75Z - 3406 Gen Set Engine
7FB - 3406 Truck Engine
7XC - 3406B Truck Engine
8FS - 3406C Gen Set Engine
8PN - 3406C Truck Engine (High Output)
8SB - 3406 Truck Engine
8TC - 3406C Truck Engine
90U - 3406A Industrial Engine
91U - 3406 Marine Engine
92U - 3406 Truck Engine
9ES - 3406C Gen Set Engine
9HB - 3406 Industrial Engine
9PL - 3406B Gen Set Engine
C2G - 3406C Gen Set Engine
C5G - 3406C Gen Set Engine
C8G - 3406C Gen Set Engine
KAR - 3406 Gas Gen Set Engine
KPS - 3406C Gen Set Engine
LRX - 3406C Gen Set Engine
PFH - 3406 Gen Set Engine
R7E - 3406 Gas Gen Set Engine




*Agkits.com cannot be held responsible for the accuracy of this data.

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