C-10 and C-12 Truck Engines Caterpillar

Compression Brake

Usage:

C-12 1YN

Show/hide table




Illustration 1	g01439044

Show/hide table




Illustration 2	g01439048
Detail B

Show/hide table




Illustration 3	g01439066
(1) Compression brake (3) Slave piston adjustment screw (6) Slave piston (7) Exhaust valve bridge (9) Exhaust valves (16) Inlet valve bridge (17) Exhaust valve bridge

(2) Locknut

Tighten the locknut to the following torque. ... 35 ± 8 N·m (26 ± 6 lb ft)

(4) Hold-down nut

Tighten the hold-down nuts to the following torque. ... 80 ± 15 N·m (60 ± 11 lb ft)

(5) Stud

Tighten the studs to the following torque. ... 100 ± 20 N·m (75 ± 15 lb ft)

Note: Prior to installation of the compression brake, install stud (5) and tighten stud (5) to the recommended torque.

(A) Slave piston lash setting

Note: The valve lash must be adjusted before adjusting the slave piston lash.

Show/hide table

Table 1
Slave Piston Lash Setting Jake Brake Compression Brakes
Serial Number Prefix	Slave Piston Lash Setting
3CS1-UP 2PN1-UP 8YS1-UP	0.64 ± 0.08 mm (0.025 ± 0.003 inch)
CPD1-UP 9SM1-UP 2KS1-UP SRK1-UP 9NS1-UP 8YF1-UP	1.02 ± 0.08 mm (0.040 ± 0.003 inch)
1YN1-UP	1.14 ± 0.08 mm (0.045 ± 0.003 inch)
MBJ1-UP MBL1-UP	1.40 ± 0.08 mm (0.055 ± 0.003 inch)

Adjust the slave piston lash while the engine is stopped and the exhaust valves are closed.

Refer to the Testing and Adjusting, "Compression Brake" for the adjustment procedure.

(8) Screw assembly (if equipped)

Apply 4C-9507 Retaining Compound to the threads of the screw assembly.

Tighten the locknut to the following torque. ... 25 ± 7 N·m (18 ± 5 lb ft)

(10) Solenoid valve

There are two different designs of solenoid valves. The difference can be determined by the number of points on the head of the solenoid valve. Use the correct torque value for your solenoid valve.

Tighten the solenoid valve with a twelve point head to the following torque. ... 12.5 N·m (110 lb in)

Tighten the solenoid valve with a six point head to the following torque. ... 20 N·m (15 lb ft)

(11) Bolt

Tighten the bolt to the following torque. ... 55 ± 10 N·m (41 ± 7 lb ft)

(12) Spacer

Tighten the spacer to the following torque. ... 100 ± 20 N·m (75 ± 15 lb ft)

(13) Bolt

Tighten the bolt to the following torque. ... 100 ± 20 N·m (75 ± 15 lb ft)

(14) Head bolt stud

Refer to the Specifications, "Cylinder Head" topic for the tightening procedure.

(15) Adjustment screw locknut for the valve lash clearance adjustment

Refer to the Specifications, "Valve Mechanism" for the adjustment procedure.