Main Bearing bolts 5/8 UNF = 265 Nm, 196 lb.ft
Connecting Rod nuts 1/2 UNF = 125 Nm, 92 lb.ft Connecting Rod screws 1/2 UNF = 152 Nm, 114 lb.ft
Cylinder Head Bolts Engine types AR and AS Step 1 = 45 Nm, 33 lb.ft Step 2 = repeat Step 1 Step 3 (1/2 inch bolts only) = 110 Nm, 80 lb.ft Step 4 = repeat Step 3 Step 5 = Stick to tightening sequence but tighten the different bolts as follows: the 1/2 set screws = + 180 degrees short set screws = + 120 degrees medium set screws = + 120 degrees long set screws = + 150 degrees
Cylinder Head Bolts Engine types AJ to AQ and YG to YK Step 1 = 45 Nm, 33 lb.ft Step 2 = repeat Step 1 Step 3 (1/2 inch bolts only) = 110 Nm, 80 lb.ft Step 4 = repeat Step 3 Step 5 = Stick to tightening sequence but tighten the different bolts as follows: the 1/2 set screws = + 150 degrees short set screws = + 150 degrees medium set screws = + 180 degrees long set screws = + 210 degrees
Displacement AJ, AK, AM, AP, AQ engines 4.0 liter, 234 CID AR, AS engines 4.23 liter, 258 CID YG, YH, YK engines 6.0 liter, 365 CID
Arrangement Six cylinder engines AJ, AK, AM, AP, AQ, AR, AS Four cylinder engines YG, YH, YK Naturally aspirated engines AJ, AP, AR, AS, YG Turbocharged engines AK, AQ, YH Turbo intercooled engines AM, YK
Bore and stroke Bore AJ, AK, AM, AP, AQ, YG, YH, YK engines 100 mm, 3.937 inches Bore AR, AS engines 103 mm, 4.055 inches Stroke 127 mm, 5.0 inches
Power output examples 4 cylinder marine gen sets 75 kVa @ 1500 rpm 90 kVa @ 1800 rpm 6 cylinder marine gen sets 112 kVa @ 1500 rpm 135 kVa @ 1800 rpm Compression ratio naturally aspirated and turbocharged 17.25:1 turbo intercooled 18.5:1
Basic specs are open to everyone and include images, displacement, dimensions and weight, essential bolt tightening torques, the characteristics of the engine like its power and torque. Essential bolt tightening torques are the main bearing cap bolt torque, the connecting rod cap bolt torque and the cylinder head bolt torques.
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Page Revision #4.2RS 07-17