Komatsu 4D102 Diesel Engine specifications and manuals

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Workshop manual, specs and bolt torques for Komatsu 4D102 engines

Komatsu 4D102 Essential Diesel Engine Bolt Tightening Torques

Main Bearing bolts
4D102E-1 Between Engine 
Nos: 26200282 - 26224124

S4D102E-1 Between Engine 
Nos: 26200163 - 26221675 

Step1 = 60 Nm
Step2 = 90 Nm
Step3 = 178 Nm

Main Bearing bolts
From 4D102E-1 
Engine No: 26224125 up

From S4D102E-1 
Engine No: 26221676 up
From SAA4D102E-2 up

Step1 = 60 Nm
Step2 = 90 Nm
Step3 = +90 degrees

Connecting Rod Bolts
Step1 = 30 Nm
Step2 = 60 Nm
Step3 = Tighten 60

Cylinder head Bolts
Step1 = tighten all 90 Nm
Step2 = check all
Step3 = six long bolts only to 120 Nm 
Step4 = tighten all bolts further 90°
Step = 5 check all bolts at 136 Nm 
(if bolt(s) found loose at 136 Nm
redo those only from step1)

Komatsu 4D102 Diesel Engine Specs

Komatsu 102 series
Displacement
4D-102 - 3.9 liter, 238 CID

Bore - 4.02", 102 mm 
Stroke - 4.72", 120 mm

Arrangement
4D-102 
4 cylinder in line turbo engine

 
Power 
4D-102 - 97-112 kW, 130-150 hp 
@ 2500 rpm

Torque 
4D-102 - 
207-221 lb.ft, 280-300 Nm 
@ 1500 rpm


Dimensions:
4D-102 approx:
length = 790 mm, 31 in
width  =  711 mm, 28 in
height =  894 mm, 35 in

Weight:
4D-102 approx:
390 Kg, 860 lb

Compression ratio:
16.5:1


Komatsu 4D102 Diesel Engine workshop repair Manuals

Komatsu 102 series Diesel Engine Images



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