Heavy Duty Machine Repair Guide

2024年1月20日星期六

How to Remove Cummins M11 Engine thermostat, Torque converter cooling plate, oil cooler and oil filter

This article mainly introduces how to remove the Cummins M11 engine thermostat, torque converter cooling

plate, oil cooler and oil filter

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① Loosen the coolant hose clamp, and remove the 4 bolts, thermostat housing and thermostat, see

Figure 2-28.

② The torque converter cooling plate restricts the flow of coolant through the thermostat housing to the

water pump bypass hose. This allows the coolant to circulate through the remotely mounted torque

converter oil cooler. Remove the torque converter cooling plate between the thermostat housing and

the

water pump bypass hose joint, see Figure 2-29.

③ Remove the 4 bolts between the oil cooler and the thermostat housing bracket flange, and remove

the

4 bolts between the oil cooler and the oil filter seat, the oil cooler and the sealing gasket, see Figure 2

-30, and remove the oil cooler water inlet pipe, water outlet pipe and mounting flange.

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④ Remove the Jacobs@ engine brake oil supply pipe, and remove the turbocharger oil return pipe bracket mounting bolts, see Figure 2-31

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⑤ Remove 9 bolts, oil filter seat and sealing gasket, see Figure 2-32. Remove the supercharger oil return pipe from the cylinder block.

2024年1月15日星期一

How to Deal with the Alarm and Speed limit of 1400RPM when the Doosan Excavator Engine is Working

This article mainly introduces how to deal with the problem of alarm and speed limit of 1400RPM when the doosan excavator engine is working.

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Fault phenomenon:

An alarm occurs during engine operation and the speed is limited to 1400RPM.

Inspection Method:

1) The vehicle has been working for 2200 hours, the equipment speed limit is 1400rpm, and the fault code retrieved is P1251: fuel balance leakage;

2) Check that the low-pressure oil line pressure is 70kpa, which is on the low side (normally around 90kpa); after cleaning the oil-water separator, the low-pressure pressure has increased, but the fault still occurs from time to time;

3) After low-pressure inspection, check the high-pressure system, connect the software to perform cylinder disconnection test and crankshaft acceleration test. There is no obvious abnormality in the working status of each cylinder;

4) Check that the resistance of the IMV valve is 3.2 ohms and is normal. Since the IMV valve is easy to disassemble, the 2018-04-27 13:49 Wang Xiaobo IMVi valve was replaced first and tested. After replacement, the equipment works normally.

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When the P1251 fault code occurs in the engine, the casing should be arranged from simple to difficult. First, check the low-pressure fuel oil line, and then conduct troubleshooting of the high-pressure well rail system.

2024年1月13日星期六

How to Disassemble the Exhaust Manifold and Intake Manifold of Cummins M11 Series Engine

This Article explains how to disassemble the exhaust manifold and intake manifold of a Cummins M11 series engine.

① The exhaust manifold assembly consists of three sections. When disassembling, remove a bolt from

the end of each section and then install two guide pins. (Part No. 3376488), remove the remaining bolts,

and then remove the exhaust manifold, see Figure 2-25.

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② Remove the intake manifold pressure sensor and temperature sensor wire connectors from the

intake manifold, see Figure 2-26.

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③ Remove the intake manifold joint and gasket from the top of the intake manifold, remove the two

mounting bolts, and install the two guide pins (Part No. 3376488), remove the remaining bolts, and

install the lifting frame to the rocker arm chamber shell with 4 M10 × 25 bolts. The tightening torque is

47N·m, see Figure 2-27.

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2024年1月10日星期三

How to Replace a Cummins B Series Engines Water Pump

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A Preparatory Steps:
Drain the coolant.

Remove the drive belt.
Remove the two capscrews and water pump, and com-plete the following steps.

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B Clean the sealing surface on the cylinder block.

C Install the new sealing ring into the pump groove.

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Install the water pump.Torque Value: 24 Nom [18 ft-lb]

2024年1月3日星期三

How to Remove Cummins M11 Turbocharger and Oil Return Pipe

This article mainly introduces how to disassemble the Cummins M11 turbocharger and the oil return pipe.

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① Remove the oil supply pipe and sealing gasket from the top of the turbocharger, remove the other end

of the oil supply pipe from the oil filter seat, and then remove the oil return pipe and sealing gasket from

the bottom of the turbocharger, see Figure 2-22.

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② Remove the V-shaped clamp, exhaust elbow and O-ring from the exhaust port of the turbocharger

compressor, remove 4 mounting nuts, remove the turbocharger and gasket, and block the supercharger

For

the oil supply hole and oil return hole, see Figure 2-23.

③ Remove the turbocharger oil return pipe joint, see Figure 2-24.

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2023年12月30日星期六

How to Disassemble Cummins M11 Series Engine Accessories

This article mainly introduces how to disassemble Cummins M11 series engine accessories ①Close the coolant valve and use a wrench (part number 3376807) to remove the coolant filter, see Figure 2-7. ② Use the oil filter wrench to remove the oil filter, see Figure 2-8.

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③ Use a wrench (part number 3376807) to remove the fuel filter, see Figure 2-9. ④ Loosen the locking nut on the fan idler pulley shaft, rotate the adjusting screw to release the tension of the transmission belt, and remove the fan drive belt, see Figure 2-10.

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⑤ If an electronic fan clutch is used, remove the fan clutch connector from the wiring harness, see Figure 2-11. ⑥Remove the 6 bolts and fan, see Figure 2-12. ⑦ Remove the 4 bolts and fan pulley, see Figure 2-13.

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