Isuzu 6RB1 6RB1T Engine Specifications and Torque Values Page 1 of 6 Tightening Torque Specifications in Ft Lbs, Clearances in MM and Inches , Pressures in PSI , 6RB1 6RB1T Head Bolts tighten in three stages: 109 Ft lbs + 137 Ft Lbs + 30 degrees Head Bolt Tightening Sequence: 16 12 3 4 9 13 20 8 5 17 19 7 6 18 15 11 2 1 10 14 Main Bearing Cap Bolts: 283 Ft Lbs Connecting Rod Bolts Nuts tighten in two stages: 51 Ft Lbs then 75 Ft Lbs Connecting Rod Bolt Nut Tightening Sequence: 1 4 3 2 Valve Cover Bolts: 29 Ft Lbs Intake Manifold Bolts: 22 Ft Lbs Exhaust Manifold Studs Nuts: 24 Ft Lbs Water Manifold Studs Nuts: 14 Ft Lbs Rocker Arm Valve Lash Adjusting Screw Lock Nut: 58 Ft Lbs Valve Lash Clearance Specification (cold): Intake Valve 0.6MM or 0.024 Inch Exhaust Valve 0.6MM or 0.024 Inch Valve Bridge Adjusting Screw Lock Nut: 41 Ft Lbs Rocker Arm Shaft Bracket Bolt: 69 Ft Lbs 6RB1 Injector Starting Pressure in PSI range 2840 – 3195 6RB1T Injector Starting Pressure in PSI range 2835 – 3200 Injector Lock Nut Torque: 40 Ft Lbs Injector Cap Nut Torque: 33 Ft Lbs Injector Nozzle Nut: 51 Ft Lbs Injector Hold Down Nut: Size M8 14 Ft Lbs / Size M10 21 Ft Lbs, Injector Fuel Lines Nut to Injector: 21 Ft Lbs Injector Fuel Lines Sealing Sleeve Nut against Head: hand tighten Injector Fuel Lines Nut to Injection Pump: 25 Ft Lbs Fuel Return Line , Leak off line, Nut to top of injector: 18 Ft Lbs Fuel Return Line , Leak off line, Hollow Bolt to Cylinder Head Fuel Passage: 18 Ft Lbs Cylinder Head Fuel Passage Hollow Bolt to Fuel Return Fitting on filter housing: 18 Ft Lbs Thermostat Cover Studs Nuts: 23 Ft Lbs Thermostat Lower Housing to Water Pump Bolts: 24 Ft Lbs Water Pump Intake Housing to Water Pump: 14 Ft Lbs Water Pump Pulley to Water Pump Shaft: 196 Ft Lbs Water Pump to Block mounting bolt: 52 Ft Lbs Isuzu 6RB1 6RB1T Specifications and Torque Values Page 1 of 6
Isuzu 6RB1 6RB1T Engine Specifications and Torque Values Page 2 of 6 Water Temperature Switch: 29 Ft Lbs Water Temperature Sensor: 27 Ft Lbs Air Boost Pipe to Intake Hollow Bolt: 18 Ft Lbs Intake Pipe Housing to Intake Manifold Bolts, Studs, Nuts, : Size M8 14 Ft Lbs / Size M10 21 Ft Lbs Intake Heater to Intake Manifold: 16 Ft Lbs Fuel Line to Intake Heater: 14 Ft Lbs Engine Stop Motor, Fuel Shut off, 17 Ft Lbs Engine Speed Sensor, RPM Sensor, 21 Ft Lbs Exhaust Manifold to Turbocharger Bolts, Studs, Nuts,: 29 Ft Lbs Turbocharger Oil Feed Pipe to Turbocharger Bolts: 18 Ft Lbs Turbocharger Oil Feed Pipe to Oil Feed Hollow Bolt: 31 Ft Lbs Turbocharger Oil Return Pipe From Turbocharger Bolt: 27 Ft Lbs Turbocharger Oil Return Pipe to Block Plate Bolts: 18 Ft Lbs Turbocharger Turbine Housing Clamp Nut: 13 Ft Lbs V Band Nut Turbocharger to Exhaust Pipe: 12 Ft Lbs Clamp Nut Turbocharger to Intake Pipe: 12 Ft Lbs Turbocharger to Exhaust Pipe Studs Nuts: 19 Ft Lbs Piston Cooling Oil Jet Bolt to Block: 15 Ft Lbs Oil Pump to Block Bolts: 37 Ft Lbs Oil Tube Bolts: 15 Ft Lbs Oil Pickup Screen Tube to Oil Pump Bolts: 15 Ft Lbs Oil Filter Housing to Block mounting bolts: 30 Ft Lbs Oil Relief Valve Cap tightening torque: 34 Ft Lbs Oil Pressure Switch tightening torque: 28 Ft Lbs Oil Pressure Sensor tightening torque: 26 Ft Lbs Oil Cooler Housing to Block Bolts: 13 Ft Lbs Oil Cooler Element to Oil Cooler Housing Bolt: 13 Ft Lbs Oil Line to Air Compressor Hollow Bolt: 29 Ft Lbs Oil Line to Injection Pump Bolts: 18 Ft Lbs Oil Line to Injection Pump Hollow Bolts: 31 Ft Lbs Input Fuel Line to Fuel Feed Pump Hollow Bolt: 29 Ft Lbs Fuel Feed Line from Fuel Feed Pump to Injection Pump Hollow Bolt: 29 Ft Lbs Fuel Filter Housing Hollow Bolts: 29 Ft Lbs Front Timing Gear Case to Block: Size M10 Bolts 29 Ft Lbs – Size M12 Bolts 50 Ft Lbs Front Timing Cover to Front Timing Gear Case: 32 Ft Lbs Cover over Injection Pump Drive Gear bolts studs nuts: 21 Ft Lbs Injection Pump Drive Gear Nut: 188 Ft Lbs Timing Gear Oil Spray Jet: 21 Ft Lbs Isuzu 6RB1 6RB1T Specifications and Torque Values Page 2 of 6
Isuzu 6RB1 6RB1T Engine Specifications and Torque Values Page 3 of 6 Idler Gear Bolts: 130 Ft Lbs Camshaft Gear Nut: 108 Ft Lbs Front Cam Bearing Flange Bolts: 31 Ft Lbs Cam Bearing Lock Bolt: 28 Ft Lbs Cam Bearing half shell fastening bolts 3 Ft Lbs Tappet Guide Bolt: 23 Ft Lbs Tappet Roller Bolt 14 Ft Lbs Oil Pan Plug: 90 Ft Lbs Oil Pan Bolts: 29 Ft Lbs Block side cover plates: 15 Ft Lbs Flywheel Housing to block bolts studs nuts: Size M8 14 Ft Lbs – Size M14 84 Ft Lbs Flywheel Bolts to Crankshaft tightening torque in 3 stages: 63 Ft Lbs then 60 degrees then 30 degrees Front Crankshaft Hub Front Crankshaft Nut: 585 Ft Lbs Front Crankshaft Pulley to Front Crankshaft Hub: 65 Ft Lbs Damper to Front Crankshaft Pulley: 40 Ft Lbs Fan Bolts: 27 Ft Lbs Fan Spacer Bolts: 14 Ft Lbs Air Compressor Drive Gear Nut: 188 Ft Lbs Air Line to Air Compressor: 224 Ft Lbs Air Compressor Mounting Bolts: 29 Ft Lbs Air Compressor Head Bolts: 19 Ft Lbs Air Compressor Delivery Valve Retainer: 80 Ft Lbs Air Compressor Cylinder to Crankcase: 19 Ft Lbs Air Compressor Connecting Rod Bolt Nut: 17 Ft Llbs Air Compressor Crankshaft Bearing Holder to Crankcase: 5 Ft Lbs Coolant Line to Air Compressor Nut: 30 Ft Lbs Injection Pump Drive Bearing Case attaching bolts: 29 Ft Lbs Injection Pump Drive Shaft to Injection Pump: 47 Ft Lbs Injection Pump Drive Coupling Bolts: M8 Size 24 Ft Lbs – M10 Size 35 Ft Lbs Injection Pump Mounting Bracket Bolts to block: M10 Size 29 Ft Lbs – M14 Size 80 Ft Lbs Injection Pump to Injection Pump Mounting Bracket Bolts: 29 Ft Lbs Injection Pump Delivery Valve Holder tighten in three steps: 80 Ft lbs then loosen, 80 Ft lbs then loosen, final 80 Ft lbs. Injection Pump Plunger and Barrel Assembly Flange to Injection Pump Housing Nuts: 28 Ft Lbs Governor Housing to Injection Pump Housing Bolts: 14 Ft Lbs Injection Pump Housing to Injection Pump Camshaft Bearing Holder Bolts: 14 Ft Lbs Governor Flyweight Nut: 39 Ft Lbs Isuzu 6RB1 6RB1T Specifications and Torque Values Page 3 of 6
Isuzu 6RB1 6RB1T Engine Specifications and Torque Values Page 4 of 6 Main Bearing to Crankshaft oil clearance in MM 0.045-0.120 Limit 0.140 Main Bearing to Crankshaft oil clearance in Inches 0.002-0.005 Limit 0.006 Connecting Rod Bearing to Crankshaft oil clearance in MM 0.035-0.105 Limit 0.130 Connecting Rod Bearing to Crankshaft oil clearance in Inches 0.0014-0.0041 Limit 0.0051 6RB1 6RB1T Intake Valve Lash Clearance (cold) 0.6MM or 0.024 Inch 6RB1 6RB1T Exhaust Valve Lash Clearance (cold) 0.6MM or 0.024 Inch Intake Valve Stem Diameter in MM 10.92-10.94 Limit 10.85 Intake Valve Stem Diameter in Inches 0.4302-0.4310 Limit 0.4275 Exhaust Valve Stem Diameter in MM 10.90-10.92 Limit 10.85 Exhaust Valve Stem Diameter in Inches .4294-.4302 Limit .4275 Intake Valve Thickness in MM 3.3 Limit 2.8 Intake Valve Thickness in Inches 0.130 Limit 0.110 Exhaust Valve Thickness in MM 2.0 Limit 1.5 Exhaust Valve Thickness in Inches 0.079 Limit 0.059 Intake Valve Protrusion above cylinder head surface in MM .5 Limit (1.5) for type A piston round combustion chamber Intake Valve Protrusion above cylinder head surface in Inches 0.20 Limit (0.60) for type A piston round combustion chamber Exhaust Valve Protrusion above cylinder head surface in MM 1.0 Limit 3.0 for type A piston round combustion chamber Exhaust Valve Protrusion above cylinder head surface in Inches 0.040 Limit 0.120 for type A piston round combustion chamber Intake Valve Protrusion above cylinder head surface in MM 1.8 Limit 3.8 for type B piston square combustion chamber Intake Valve Protrusion above cylinder head surface in Inches .071 Limit .150 for type B piston square combustion chamber Exhaust Valve Protrusion above cylinder head surface in MM 1.6 Limit 3.6 for type B piston square combustion chamber Exhaust Valve Protrusion above cylinder head surface in Inches 0.63 Limit .142 for type B piston square combustion chamber Intake Valve to Intake Valve Seat contact width in MM 1.9 Limit 3.4 Intake Valve to Intake Valve Seat contact width in Inches .075 Limit .134 Exhaust Valve to Exhaust Valve Seat contact width in MM 2.0 Limit 4.3 Exhaust Valve to Exhaust Valve Seat contact width in Inches .079 Limit .169 Intake Valve Stem to Intake Valve Guide in MM 0.05-0.10 Limit 0.20 Intake Valve Stem to Intake Valve Guide in Inches 0.020-0.004 Limit 0.008 Exhaust Valve Stem to Exhaust Valve Guide in MM 0.08-0.10 Limit 0.25 Exhaust Valve Stem to Exhaust Valve Guide in Inches 0.003-0.004 Limit 0.010 Intake Valve Spring free length with type A pistons in MM 66.4 Limit 62.0 Isuzu 6RB1 6RB1T Specifications and Torque Values Page 4 of 6
Isuzu 6RB1 6RB1T Engine Specifications and Torque Values Page 5 of 6 Intake Valve Spring free length with type A pistons in Inches 2.62 Limit 2.44 Exhaust Valve Spring free length with type A pistons in MM 66.4 Limit 62.0 Exhaust Valve Spring free length with type A pistons in Inches 2.62 Limit 2.44 Intake Valve Spring free length with type B pistons in MM 69.0 Limit 66.4 Intake Valve Spring free length with type B pistons in Inches 2.72 Limit 2.62 Exhaust Valve Spring free length with type B pistons in MM 73.6 Limit 69.0 Exhaust Valve Spring free length with type B pistons in Inches 2.90 Limit 2.72 Clearance between valve bridge and valve bridge guide in MM .020-.047 Limit 0.100 Clearance between valve bridge and valve bridge guide in Inches .0008-.0019 Limit .0040 Timing Idler Gear End Play in MM 0.003-0.100 Limit 0.200 Timing Idler Gear End Play in Inches 0.00010-0.0040 Limit 0.0080 Timing Gears Backlash in MM 0.125-0.200 Limit 0.250 Timing Gears Backlash in Inches 0.0049-0.0078 Limit 0.010 Crankshaft Thrust Washer End Play in MM 0.04-0.19 Limit 0.30 Crankshaft Thrust Washer End Play in Inches 0.0016-0.0075 Limit 0.118 Tappet diameter in MM 29.94-29.97 Limit 29.90 Tappet diameter in Inches 1.180-1.181 Limit 1.178 Tappet Roller Height in MM 2.5 Limit 1.5 Tappet Roller Height in Inches .099 Limit 0.59 Tappet to Tappet Guide clearance in MM .03-.09 Limit .15 Tappet to Tappet Guide clearance in Inches .0012-.0035 Limit .0059 Push rod run-out ( bend ) in MM Limit .5 Push rod run-out ( bend ) in Inches Limit .02 Rocker Arm Shaft outside diameter in MM 29.98-30.00 Limit 29.85 Rocker Arm Shaft outside diameter in Inches 1.181-1.182 Limit 1.176 Rocker Arm Bushing inside diameter in MM 30.03-30.08 Limit 30.10 Rocker Arm Bushing inside diameter in Inches 1.182-1.184 Limit 1.185 Rocker Arm Bushing to Rocker Arm Shaft Clearance in MM .03-.10 Limit .20 Rocker Arm Bushing to Rocker Arm Shaft Clearance in Inches .0012-.0040 Limit .0080 Idler Gear Shaft Diameter in MM 75.95-75.96 Limit 75.83 Idler Gear Shaft Diameter in Inches 2.992-2.993 Limit 2.998 Idler Gear to Idler Gear Shaft clearance in MM .04-.10 Limit .20 Idler Gear to Idler Gear Shaft clearance in Inches .0016-.0040 Limit .0080 Camshaft Lobe Height in MM 7.53 Limit 7.03 Camshaft Lobe Height in Inches 2.96 Limit 2.77 #1 Camshaft Journal Diameter in MM 55.94-55.97 Limit 55.91 #2 through #7 Camshaft Journal Diameter in MM 43.95-43.98 Limit 43.92 #1 Camshaft Journal Diameter in Inches 2.204-2.205 Limit 2.203 #2 through #7 Camshaft Journal Diameter in Inches 1.732-1.733 Limit 1.730 Isuzu 6RB1 6RB1T Specifications and Torque Values Page 5 of 6
Isuzu 6RB1 6RB1T Engine Specifications and Torque Values Page 6 of 6 Camshaft Gear to Camshaft Thrust Plate, Camshaft end play, in MM .06 Limit .20 Camshaft Gear to Camshaft Thrust Plate, Camshaft end play, in Inches .002 Limit .008 Cylinder Liner Inside Diameter in MM Nominal: 135.00 Limit: 136.50 Cylinder Liner Inside Diameter in Inches Nominal: 5.319 Limit: 5.378 Cylinder Liner Protrusion above block surface in MM: .05-.10 Cylinder Liner Protrusion above block surface in Inches: .0020-.0039 Maximum difference between cylinder liner protrusions in MM .02 Maximum difference between cylinder liner protrusions in Inches .0008 6RB1 Piston to Cylinder wall clearance in MM .208-.227 6RB1 Piston to Cylinder wall clearance in Inches .0082-.0089 6RB1T Piston to Cylinder wall clearance in MM .224-.243 6RB1T Piston to Cylinder wall clearance in Inches .0088-.0096
For more details the Isuzu 6RB1 6RB1T Engine Workshop Manual is available here: www.Isuzu-6RB1.com Engine Parts for heavy equipment, Isuzu Diesel, Mitsubishi Diesel, Hino Diesel, Nissan Diesel, Mercedes Benz Diesel, Heavy Equipment Restoration Parts LLC 4730 118th Ave Fennville Michigan 49408 USA Phone: 269 673 1638 Fax: 269 673 7226 email: EngineParts@HeavyEquipmentRestorationParts.com Website: www.HeavyEquipmentRestorationParts.com
Isuzu 6RB1 6RB1T Specifications and Torque Values Page 6 of 6