Displacement

6.5L

RPO

L65

Type

90 degree V8 diesel

Bore

103 mm

Stroke

97 mm

Compression Ratio

21.3:1

Firing Order

1-8-7-2-6-5-4-3

Oil Pressure

10 psi at idle (hot); 40-45 psi at 2000 RPM

Cylinder Bore Out-of-Round¹

0.02 mm (Maximum)

Cylinder Bore Taper (Thrust Side)¹

0.02 mm (Maximum)

Piston to Bore Clearance (Bohn Pistons 1-6)

0.094-0.120 mm

Piston to Bore Clearance (Bohn Pistons 7-8)

0.107-0.133 mm

Piston Ring Compression Groove Clearance (Top)

Keystone-type ring

Piston Ring Compression Groove Clearance (Second)

0.039-0.079 mm

Piston Ring Compression Gap² (Top)

0.26-0.51 mm

Piston Ring Compression Gap² (Second)

0.75-1.00 mm

Piston Ring Oil Groove Clearance

0.040-0.090 mm

Piston Ring Oil Gap

0.25-0.51 mm

Piston Pin Diameter

30.9961-31.0039 mm

Piston Pin Clearance (Piston Pin to Piston Bore)

0.0101-0.0153 mm

Piston Pin Fit in Rod (Piston Pin to Rod Pin Bushing)

0.0081-0.0309 mm

Crankshaft Main Journal Taper

0.005 mm (Maximum)

Crankshaft Main Journal Out-of-Round

0.005 mm (Maximum)

Crankshaft Main Bearing Clearance (#1, #2, #3 and #4)

0.045-0.083 mm

Crankshaft Main Bearing Clearance (#5)

0.055-0.093 mm

Crankshaft End Play

0.10-0.25 mm

Crankshaft Crankpin Diameter

60.913-60.939 mm

Crankshaft Crankpin Taper

0.005 mm (maximum)

Crankshaft Crankpin Out-of-Round

0.005 mm (maximum)

Crankshaft Rod Bearing Clearance (Select Fit)

0.045-0.100 mm

Crankshaft Rod Side Clearance

0.17-0.63 mm

Camshaft Lobe Lift ± 0.05 (Intake and Exhaust)

7.133 mm

Journal Diameter (#1, #2, #3 and #4)

54.970-55.025 mm

Journal Diameter (#5)

50.970-51.025 mm

Journal Clearance (#1, #2, #3 and #4)

0.025-0.118 mm

Journal Clearance (#5)

0.020-0.113 mm

Camshaft End Play

0.051-0.305 mm

Valve Lifter

Hydraulic roller

Valve Rocker Arm Ratio

1.5:1

Valve Lash (Intake and Exhaust)

Not adjustable

Valve Protrusion (Intake)

(Negative because valve is recessed in head)

-0.034 mm

Valve Protrusion (Exhaust)

(Negative because valve is recessed in head)

-0.048 mm

Valve Face Angle (Intake and Exhaust)

45°

Valve Seat Angle (Intake and Exhaust)

46°

Valve Seat Runout (Intake and Exhaust)

0.05 mm

Valve Seat Width (Intake)

0.89-1.53

Valve Seat Width (Exhaust)

1.57-2.36

Valve Stem Clearance (Intake)

0.026-0.069

Valve Stem Clearance (Exhaust)

0.026-0.069

Valve Spring Pressure (Closed) Newtons @ mm

356 N @ 46.0 mm

Valve Spring Pressure (Open) Newtons @ mm

1025 N @ 35.3 mm

Valve Spring Installed Height

46 mm

Timing Chain Free Play (New Chain)

12.7 mm (0.500 in)

Timing Chain Free Play (Used Chain)

20.3 mm (0.800 in)

¹ Add 0.013 mm to cylinder bore diameters in order to determine proper bore size for cylinders #7 and #8.

² Ring end gap specifications are for new bores. Worn bores will generate larger ring end gaps.