Valve Lash & Overhead Detroit DD16 Verified Factory Specs

Detroit Diesel DD16 Heavy Haul Valve Lash & Jake Brake Specs

Factory OEM cold valve lash adjustment specifications, feeler gauge sizes, and TDC cylinder firing order steps for Detroit DD16 (600 HP) heavy haul commercial diesel engines.

Selected Heavy Diesel Engine

Intake Valve Lash (Cold)

0.014 in

Feeler Blade: .014 in (0.35 mm)

Exhaust Valve Lash (Cold)

0.027 in

Feeler Blade: .027 in (0.70 mm)

Engine Brake (Jake) Lash

0.163 in

Feeler Blade: .163 in (4.15 mm)

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.

Step 1 of 2: Cylinder 1 at Top Dead Center (TDC)

Bar engine to TDC Compression Cylinder 1

Valves to Adjust in this Position:Cylinder 1 Intake & Exhaust, Cylinder 2 Intake, Cylinder 4 Exhaust, Cylinder 3 Intake

Engine Brake (Jake) & Injector Settings:Cylinder 1 & Cylinder 5 Engine Brake Rockers (.163 in / 4.15 mm)

Rocker Arm Lock Nut Torque: 37 ft-lbs (50 N·m)

Source: Detroit Diesel Service Manual DDC-SVC-MAN-0081 (DD16 Engine Platform)

Detroit DD16 Overhead & Jake Brake Adjustment

The DD16 shares the DD platform dual overhead camshaft architecture with the DD15. Lash adjustment is performed cold:

Step 1: TDC Compression Cylinder 1

Intake Valves: Cylinder 1, Cylinder 2, Cylinder 4 (.014 in / 0.35 mm)
Exhaust Valves: Cylinder 1, Cylinder 3, Cylinder 5 (.027 in / 0.70 mm)
Engine Brake Rockers: Cylinder 1 & Cylinder 5 (.163 in / 4.15 mm)

Step 2: TDC Compression Cylinder 6 (Bar 360°)

Intake Valves: Cylinder 6, Cylinder 5, Cylinder 3 (.014 in / 0.35 mm)
Exhaust Valves: Cylinder 6, Cylinder 4, Cylinder 2 (.027 in / 0.70 mm)
Engine Brake Rockers: Cylinder 6, Cylinder 2, Cylinder 4 (.163 in / 4.15 mm)

Locknut Torque: Torque rocker arm adjust screw locknuts to 37 ft-lbs (50 N·m).