This document describes the disassembly of the injectors and rocker arm housing of the Cummins M11 series engine.

 

① Remove the injector fixing screws and clamps, and use an injector puller (part number 3823579) to remove the injectors from the engine. Mark the cylinder number on each injector, see Figure 2-80. ② Remove the rocker arm housing and other parts, see Figure 2-81. (6) Cylinder Head Removal 

 ① Remove 7 bolts from the cylinder head, and remove the three bolts inside the intake port, see Figure 2-82. 

 ② Remove the remaining 32 bolts from both ends to the middle, see Figure 2-83. The order shown in the figure is the tightening order when installing the bolts; the order is reversed during disassembly. 

 ③ Install the cylinder head lift bracket (part number 3822479) in the middle of the cylinder head, see Figure 2-84. Bolt 1 is M14-2.00x35, bolt 2 is M10-1.50x15, and the tightening torque is 47 N·m.

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Figure 2-80: Remove the fuel injectors using a puller and mark their cylinder numbers. 

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 Figure 2-81 Removing parts such as the rocker arm chamber housing

 

Figure 2-82 Remove cylinder head bolts

 

 Figure 2-83 Remove the remaining 32 bolts from both ends to the middle.

 

④ Use a crane to lift the cylinder head and lower it down, as shown in Figure 2-85, and remove the cylinder head gasket. 

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 Figure 2-84 Installing the cylinder head lift bracket in the middle of the cylinder head using bolts 1 and 2.

 

 

 

 Figure 2-85 shows the cylinder head being lifted and lowered using a crane.

Remove the nut and washer from the cam follower bracket. Insert the cam follower removal tool (part number 3824519) under the follower and around the bracket, continuing to insert the tool forward until the adjusting screw at the top of the tool can be screwed into the injector cam follower recess by hand, as shown in Figure 2-86. Lift the cam follower assembly and remove it from the engine, as shown in Figure 2-87.

 

How to Install the Thermostat from a Cummins M11 series engine

 Installation
1.Install the thermostat.
…
2.Install the gasket.|
3.lInstall the water outlet pipe.
·Connect outlet pipe and tighten bolts to the
specified torque.
Tightening torque: 19 N-m(1.9 kg-m/14Ib-ft)
4.Install the radiator upper hose at the radiator side.
5.Installthe turbocharger coolant hose.

 6.Close the engine cover.(Non-tilt cab model

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7.Connedt the battery cable negative terminal

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How to remove the Thermostat from a Cummins M11 series engine

                              

 Legend
1.Water outlet pipe

2.Gasket

3.Thermostat

 Removal
1.Drain the engine coolant.
Prepare a container for discharge and use it for
filling when installing the thermostat.The amount
of coolant to be discharged should be enough to
avoid coolant from spilling from the housing on the
cylinder head side.

 2.Open the engine cover.(Non-tilt cab model only)

 3.Remove the turbocharger coolant hose.

 4.Remove the radiator upper hose at the radiator
side.
5.Remove the water outlet pipe.
6.Remove the thermostat.

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 Inspection
·Place the thermostat in water,and raise the water
temperature while thoroughly stirring it.
Measure the temperatures when the valve starts
opening and whenit is fully opened.

 

    

How to disassemble the injector and rocker arm housing of a Cummins M11 series engine

① Remove the injector fixing screws and clamps, and use an injector puller (part number 3823579) to remove the injectors from the engine. Mark the cylinder number on each injector, as shown in Figure 2-80.

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 Figure 2-80 shows the fuel injectors being removed using a puller and their cylinder numbers being marked.

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 ② Remove the rocker arm chamber housing and other parts, see Figure 2-81.

 

 

 

How to disassemble the pushrod, rocker arm assembly, and T-plate of a Cummins M11 series engine

 ①Loosen the adjusting screw, remove the valve pushrod and injector pushrod, and mark their positions as shown in Figure 2-76. (The process of disassembling...)

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When disassembling, if the pushrod is in a spring-compressed state, use a wrench to rotate the crankshaft to release the spring tension. 

 ② Install a 1/4-inch wide and 18-inch long positioning bracket on top of the front bracket of the four rocker arm assemblies. Secure the positioning bracket to the bracket with four bolts (M10-1.5x25), as shown in Figure 2-77. Secure one end of the bracket to the engine brake mounting hole with two bolts on the end bracket. Secure the other end of the bracket to the engine brake mounting hole with two bolts on the middle bracket.

 

Figure 2-76 Remove the valve pushrods and injectors, and mark their positions.

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Figure 2-77 shows the positioning bracket being fixed to the support using bolts.

③ Loosen the eight rocker arm shaft bolts that connect the rocker arm assembly. Grasp the positioning bracket and lift the front rocker arm assembly from the engine to complete the disassembly of the rocker arm assembly, as shown in Figure 2-78. ④ Remove the T-plates and mark their locations, as shown in Figure 2-79.

 

Figure 2-78 Lifting the front rocker arm assembly from the engine

 

 

Figure 2-79 Remove the T-shaped pressure plate and mark its position.

 

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Disassembly of the Jacobs engine brakes on a Cummins M11 series engine

    ① If the engine is equipped with Jacobs engine brakes, the connector should be pressed into the front housing, as shown in Figure 2-74, to leave space for housing removal.

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  ② Remove the mounting bolts and brakes from the engine, as shown in Figure 2-75.

 

 

 

 Figure 2-74 shows the connector being pressed into the front housing. Figure 2-75 shows the removal of the mounting bolts and brake.

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How to disassemble the rocker arm housing and cylinder head of a Cummins M11 series engine

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(1) Disassembly of the rocker arm housing components: Remove the crankcase breather clamp, rocker arm housing cover bolts, vibration damping washers, and spacers. Remove the rocker arm housing cover and gasket, as shown in Figure 2-71. 

 (2) Disassembly of the rocker arm housing housing partition: 

 ① If the engine is equipped with a Jacobs engine brake, disconnect the two electrical connectors from the inside and outside of the partition.

 

Figure 2-70 Remove a section of the actuator wiring harness inside. Figure 2-71 Remove the rocker arm chamber cover, gasket, and breather tube clamp. 1—Clamp

 

 

Disconnect the oil supply hose connector and remove the oil supply hose, as shown in Figure 2-72. ② Remove the 16 bolts and the partition, as shown in Figure 2-73. 

 

 

 

 

 

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 Figure 2-72 Remove the two electrical connectors and disconnect the oil supply pipe. 

Figure 2-73 Remove the rocker arm housing partition.