6.7L Diesel
WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
GENERAL DESCRIPTION
| DESCRIPTION | SPECIFICATION |
|---|---|
| Engine Type | In-Line 6 Cyl. Turbo Diesel |
| Displacement | 6.7 Liters 409 (Cubic Inches) |
| Bore | 107.0 mm (4.21 in.) |
| Stroke | 124.0 mm (4.88 in.) |
| Compression Ratio | 17.2:1 |
| Cylinder Pressure (Minimum) | 350 psi. |
| Horsepower High Output 68 RE A/T and G 56 M/T (pickup) | 350 HP @ 3013 RPM |
| Horsepower High Output 68 RE A/T and G 56 M/T (cab chassis) | 305 HP @ 3013 RPM |
| Maximum Compression Pressure Variation Between Cylinders | 20% from cylinder to cylinder |
| Torque Rating High Output 68RE A/T and G 56 M/T (pickup) | 650 ft. lbs. @ 1500 RPM (auto) 610 ft. lbs. @ 1500 RPM (manual) |
| Torque Rating High Output 68RE A/T and G 56 M/T (cab chassis) | 610 ft. lbs. @ 1600 RPM (manual) |
| Lubrication System | Pressure Feed-Full Flow With Bypass Valve |
| Firing Order | 1-5-3-6-2-4 |
| Cylinder Block | Cast Iron |
| Crankshaft | Induction Hardened Forged Steel |
| Cylinder Head | Cast Iron With Valve Seat Inserts |
| Combustion Chambers | High Swirl Bowl |
| Camshaft | Chilled Ductile Iron |
| Pistons | Cast Aluminum |
| Connecting Rods | Cross Rolled Micro Alloy |
PISTONS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Skirt Diameter (Measure the skirt 21.4 mm (0.84 in) from the bottom of the piston) |
106.828- 106.892 mm | 4.2078 - 4.2083 in. |
| Ring Groove Clearance | The clearance for the top piston ring groove can not be measured accurately with a typical feeler gauge. | The clearance for the top piston ring groove can not be measured accurately with a typical feeler gauge. |
| Intermediate (Min) | 0.040 mm | 0.0016 in |
| (Max) | 0.110 mm | 0.0043 in. |
| Oil Control (Min) | 0.040 mm | 0.0016 in. |
| (Max) | 0.085 mm | 0.0033 in. |
PISTON PINS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Pin Diameter (Min) | 39.997 mm | 1.5747 in. |
| (Max) | 40.003 mm | 1.5749 in. |
| Bore Diameter (Min) | 40.006 mm | 1.5750 in. |
| (Max) | 40.012 mm | 1.5753 in. |
PISTON RINGS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Ring Gap | ||
| Ring Gap Wear Limit | ||
| Top Ring | 0.30 - 0.46 mm | 0.012 - 0.018 in. |
| Intermediate | 0.82 - 1.18 mm | 0.032 - 0.047 in. |
| Oil Control | 0.22 - 0.58 mm | 0.010 - 0.023 in. |
| Top Ring | See Above | See Above |
| Intermediate | See Above | See Above |
| Oil Control | See Above | See Above |
CONNECTING RODS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Bearing Clearance | ||
| Desired | 0.04 - 0.12 mm | 0.002 - 0.005 in. |
| Wear Limit | See Above | See Above |
| Pin Bore Diameter (Min. w/ bushing installed) | 40.019 mm | 1.5764 in. |
| Pin Bore Diameter (Max. w/ bushing installed) | 40.042 mm | 1.5765 in. |
| Side Clearance (Min) | 0.100 mm | 0.004 in. |
| Side Clearance (Max) | 0.330 mm | 0.013 in. |
CYLINDER HEAD
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Overall Flatness End To End (max) | 0.305 mm | 0.012 in. |
| Overall Flatness Side To Side (Max) | 0.076 mm | 0.003 in. |
| Intake Valve Seat Angle | 30° | 30° |
| Exhaust Valve Seat Angle | 45° | 45° |
| Valve Stem Diameter | ||
| (Min) | 6.96 mm | 0.2740 in. |
| (Max) | 7.01 mm | 0.2760 in. |
| Valve Margin (Min.) | 0.79 mm | 0.031 in. |
INJECTOR PROTRUSION
| DESCRIPTION | Metric | Standard |
|---|---|---|
| MIN | 2.45 mm | 0.96 in. |
| MAX | 3.15 mm | 0.124 in. |
|
NOTE:
Do NOT use thicker or double stacked injector sealing washers to correct injector protrusion. This will cause misalignment of the high pressure fuel connector. |
||
OIL PUMP
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Tip Clearance Between Rotors (Max) | 0.178 mm | 0.007 in. |
OIL PRESSURE
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| At Idle | 69 kPa | 10 psi |
| @ 2500 rpm | 207 kPa | 30 psi |
| Regulating Valve Opening Pressure | 517 kPa | 75 psi |
| Oil Filter Bypass Pressure Setting | 344.75 kPa | 50 psi |
CYLINDER BLOCK
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Cylinder Bore Diameter | New - 106.990 - 107.010 mm | New - 4.2122 - 4.2130 in. |
| Used - 106.990 - 107.030 mm | Used - 4.2122 - 4.2138 in. | |
| Out of Round (Max.) | 0.038 mm | 0.0015 in. |
| Taper (Max.) | 0.076 mm | 0.003 in. |
| Tappet Bore Diameter | 16.000 - 16.055 mm | 0.630 - 0.632 in. |
| Camshaft Bearing / Support Bore Diameter(s) | 54.083 - 54.147 mm (Bushing Installed) | 2.1293 - 2.1318 in. (Bushing Installed) |
CRANKSHAFT
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Connecting Rod Journal Diameter | 68.962 - 69.013 mm | 2.7150 - 2.7170 in. |
| Out-of-Round (Max.) | 0.050 mm | 0.002 in. |
| Taper (Max.) | 0.013 mm | 0.0005 in. |
| End Play Range | 0.120 - 0.432 mm | 0.004 - 0.017 in. |
| Desired End-Play | See Above | See Above |
| Wear Limit | See Above | See Above |
| Main Bearing Clearance 1-6 | 0.04 - 0.12 mm | 0.002 - 0.005 in. |
| Wear Limit | See Above | See Above |
MAIN BEARING JOURNALS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Diameter - High | 83.013 mm | 3.2682 in. |
| Diameter - Low | 82.962 mm | 3.2662 in. |
| Taper | ||
| Out of Round (Max.) | ||
CAMSHAFT
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Journal Diameter | 53.095 - 54.045 mm | 2.0904 - 2.1278 in |
| Bore Diameter | See Cylinder Block CYLINDER BLOCK table | See Cylinder Block CYLINDER BLOCK table |
| End Play | 0.12 - 0.5 mm | 0.005 - 0.02 in. |
SOLID TAPPETS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Stem Diameter | 15.936 - 15.977 mm | 0.627 - 0.629 in. |
VALVES
| DESCRIPTION | SPECIFICATION | ||
|---|---|---|---|
| Metric | Standard | ||
| Valve Stem Diameter | (Min) | 6.96 mm | 0.2740 in. |
| (Max.) | 7.01 mm | 0.2760 in. | |
| Valve Margin - Intake | 0.79 mm | 0.031 in. | |
| Valve - Exhaust | 0.79 mm | 0.031 in. | |
VALVE SPRINGS
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Free Length - Spring | 47.75 mm | 1.88 in. |