Heavy Duty Diesel Specs, Torque & Valve Lash
Zero-delay technical lookup for fleet technicians, shop foremen, and heavy equipment mechanics. Verified factory OEM torque sequences, overhead clearances, and fluid capacities.
Master Valve Lash & Jake Brake Feeler Selector
Select your engine model to see exact intake, exhaust, and engine brake slave piston clearances with step-by-step TDC cylinder firing order instructions.
Cylinder Adjustment Stepper (Firing Order: 1-5-3-6-2-4)
Click Step 1 or Step 2 to highlight which valves to set based on crankshaft timing mark.
Heavy Diesel Engineering Pillars
Five dedicated technical directories built to factory service manual standards.
Valve Lash & Overhead
Feeler gauge thicknesses, intake/exhaust specs, and Jake brake clearances for Cummins, Detroit, Cat & PACCAR.
Oil & Coolant Capacities
Standard vs deep sump fill volumes, filter compensation, oil viscosity recommendations, and coolant capacities.
Head Bolt Torque
Torque-to-yield angle stages, bolt counts, thread sizes, and center-outward tightening patterns.
SPN / FMI Fault Codes
J1939 diagnostic trouble code solver, sensor wiring pinouts, derate severity, and probable cause matrices.
Fuel Burn & DEF Dosing
Fleet fuel consumption in GPH and MPG, SCR DEF dosing rates, and Brake Specific Fuel Consumption (BSFC) math.
Commercial Heavy Diesel Engine Spec Matrix
| Engine Model | Displacement | Intake Lash (Cold) | Exhaust Lash (Cold) | Jake Brake Lash | Oil Capacity (Std Sump) | Head Bolts | Quick Tools |
|---|---|---|---|---|---|---|---|
| Cummins ISX15 / X15 | 14.9L I-6 | .014 in (0.36 mm) | .027 in (0.69 mm) | .070 in (1.78 mm) | 11 Gal (44 Qts) | 38 Bolts | |
| Detroit Diesel DD15 (GHG14 / GHG17 / Gen 5) | 14.8L I-6 | .014 in (0.35 mm) | .027 in (0.70 mm) | .163 in (4.15 mm) | 11.25 Gal (45 Qts) | 38 Bolts | |
| Caterpillar C15 & C15 ACERT (6NZ / BXS / MXS) | 15.2L I-6 | .015 in (0.38 mm) | .030 in (0.76 mm) | .027 in (0.69 mm) on Jake Slave Piston | 10 Gal (40 Qts) | 26 Bolts | |
| PACCAR MX-13 (EPA10 / EPA13 / EPA17 / EPA21) | 12.9L I-6 | .016 in (0.40 mm) | .028 in (0.70 mm) | .055 in (1.40 mm) | 10.5 Gal (42 Qts) | 38 Bolts | |
| Detroit Diesel DD13 | 12.8L I-6 | .014 in (0.35 mm) | .027 in (0.70 mm) | .163 in (4.15 mm) | 10 Gal (40 Qts) | 38 Bolts | |
| Caterpillar 3406E (5EK / 2WS / 1MM) | 14.6L I-6 | .015 in (0.38 mm) | .030 in (0.76 mm) | .027 in (0.69 mm) | 10 Gal (40 Qts) | 26 Bolts | |
| Detroit Diesel DD16 (Heavy Haul 600 HP) | 15.6L I-6 | .014 in (0.35 mm) | .027 in (0.70 mm) | .163 in (4.15 mm) | 11.5 Gal (46 Qts) | 38 Bolts |