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Isuzu 4J engine specifications and bolt torques - amp

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Isuzu A-4JA1 and A-4JB1
Cylinder Head Bolt

New Bolt
Step 1 = 21.7 - 36.1 lb.ft, 29.4 - 49.0 Nm
Step 2 = 59.4 - 66.5 lb.ft, 80.4 - 90.2 Nm

Reused Bolt
Step 1 = 57.9 - 65.1 lb.ft, 78.4 - 88.2 Nm
Step 2 = 72.4 - 79.6 lb.ft, 98.1 - 107.9 Nm

Isuzu 4JB1 Engine Specifications


Isuzu 4JB1
Displacement, bore, stroke, compression ratio

3.7 inches 93 mm

4.0 inches 102 mm

169 CID, 2.8 liter

Compression Ratio

Isuzu 4J

Dry Weight
480 lb, 218 kg

486 lb, 220 kg

540 lb, 245 kg

552 lb, 250 kg

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essential bolt tightening torques, 
characteristics of the engine 
e.g. its power and torque. 

Essential bolt torques are:
 main bearing cap bolts 
 connecting rod cap bolts
cylinder head bolt torques

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