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

 
Komatsu 155-4 series image
Komatsu 4D102 engine - click for specs and manuals

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Komatsu 4D102 Essential Diesel Engine Bolt Tightening Torques

 
Komatsu 4D102
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

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Komatsu 4D102
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

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Komatsu 4D102
Connecting Rod Bolts 
and Cylinder Head Bolts

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 degrees
Step5 = check all bolts at 136 Nm 
(if bolt(s) found loose at 136 Nm redo those only from step1)

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Komatsu 4D102 Diesel Engine workshop repair Manuals

 
Komatsu 102 Series - Workshop Manual, Introduction, Testing and Adjusting
Komatsu 102 Series Introduction, Testing and Adjusting - 286 pages

Komatsu 102 Series - Workshop Manual - Disassembly and Assembly section
Komatsu 102 Series Workshop Manual - Disassembly and Assembly section - 431 pages

Komatsu 102 Series - Workshop Manual - Repair of Components, Maintenance
Komatsu 102 Series, Workshop Manual - Repair of Components and Maintenance section - 88 pages

Komatsu 4D102 Diesel Engine Specs

 
Komatsu 102 series
Displacement, bore and stroke

Displacement
4D-102 - 3.9 liter, 238 CID

Bore
4.02", 102 mm 

Stroke
4.72", 120 mm

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Komatsu 4D102
Arrangement

4 cylinder in line turbo engine

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Komatsu 4D102
Power

97-112 kW, 130-150 hp 
@ 2500 rpm

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Komatsu 4D102
Torque

207-221 lb.ft, 280-300 Nm 
@ 1500 rpm

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Komatsu 4D102 
Dimensions

approx
length = 790 mm, 31 in
width  =  711 mm, 28 in
height =  894 mm, 35 in

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Komatsu 4D102 
Weight

approx
390 Kg, 860 lb

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Komatsu 4D102
Compression ratio

16.5:1

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Komatsu 102 series Diesel Engine Images

 
Image Komatsu 114 series engine, front view
Komatsu 6D102 serial number plate - click for specs and manuals

Image Komatsu 102 series engine, front view
Komatsu 102 series engine, front view - click for specs and manuals

Image Komatsu 6D102 engine in for repairs, left view
Komatsu 6D102 engine in for repairs, left view - click for specs and manuals

Image wip Komatsu 6D102 engine in for repairs, left view
WIP Komatsu 6D102 engine in for repairs, right view - click for specs and manuals

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More Komatsu Engine Specs, Bolt torques and manuals

Komatsu diesel engine manuals, bolt torques, specs
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email: steve@barringtondieselclub.co.za
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Page Revision #11.5RsC 10-18