How to check and repair the high temperature of Kubota J112 generator set? Please help analyze the causes and solutions of high temperatures

KubotaJ112 generator set high temperatureWhy?It may be caused by problems with the cooling system, lubrication system, combustion system or mechanical components. Here are the system inspection steps and solutions:

I.KubotaJ112 generator set high temperatureAnalysis of common causes：

1、Cooling system problems：

A. Lack or deterioration of cold hoachohol：

B, heat exchanger clogging (dust, catkins, etc.)

C. Pump failure (impeller damage, leakage)

D. Thermostat stuck (unable to open the large cycle)

E, the fan belt slack or broken.

2、Problem with the lubrication system：

A, lack of oil or deterioration (poor lubrication leads to friction heating)

The lubrication oil filter is blocked.

3、A combustion system problem：

A. Fuel injection timing is not correct (too early or too late)

B. Nozzle atomization is poor (insufficient combustion)

C. Excessive load (overload operation)

4、Mechanical failure：

A, cylinder pad damage (cold water into the combustion chamber)

B. Plug ring wear (high temperature gas leakage in the cylinder)

5、Other reasons：

A. Excessive ambient temperature or poor ventilation

B. Temperature sensor or instrument failure (false alarm)

II.KubotaJ112 generator set high temperatureInspections and repair steps：

1. Preliminary inspection:

A. Observation instruments: Make sure that the high temperature alarm is true (compare the actual water temperature with the meter display).

B. Check the cold water: Whether the liquid level is in the standard range and whether the color is normal (cloudy, oily stains may indicate damage to the cushion).

C. Check the oil: Oil level, oil quality (if whitening occurs, it may be mixed with the coolant).

2. Cooling system inspection:

A. Heat exchanger cleaning: Clean surface blockages with compressed air or water cannon.

B. Water pump test: After starting, observe whether the coolant circulation is normal (whether the touch water pipe temperature is even).

C. Thermostat test: Remove and put in hot water to check the open temperature (The J112 is usually turned on around 82C).

D. Fan belt: Press the middle section of the belt, the amount of dilation should be within10-15mm (too loose to adjust).

3. A lubrication system inspection：

A. Change the oil and filter: Use the original manufacturer specified model (e.g.SAE 15W-40）。

B. Check the oil line: Is the oil pump pressure normal (to be tested with a pressure gauge).

4. Burn and load inspection：

A. Fuel injection system：

Check the nozzle vaporization (take off and test the shape of the spray).

Calibrate the correct timing of oil spraying (requires specialized equipment).

B. Load testing: Avoid long periods of overload (rated power)Below 80 per cent is desirable).

5. Mechanical fault diagnosis：

A. Cylinder pressure test: Excessive pressure may indicate a piston ring or cushion problem.

B. Exhaust color: White smoke may be damaged by the cushion (the coolant enters the combustion chamber).

6.Environment and Instrumentation：

A. Ventilation improvement：Make sure there is enough cooling space around the unit (at least)1 m spacing)。

B. Sensor calibration: Use a Universal Scale to detect whether the water temperature sensor resistance values change with temperature.

III.KubotaJ112 generator set high temperatureExamples of Solutions：

case1: The radiator is blocked
phenomenon: High temperature alarm and dust covering the surface of the radiator.
Handle: Clean the radiator thoroughly and restore the temperature after ventilation.

case2: Thermostat failure
phenomenon: The small circulating water pipe is hot, the large circulating water piping is cool.
Handle: Replace the thermostat (note the direction of installation).

case3: Delay in the timing of oil spraying
phenomenon: The exhaust pipe smells of black smoke and the power decreases.
HandleAdjust fuel injection pump timing to normal angle.

IV.KubotaJ112 generator set high temperatureprotective stepHow to do this:

1、Replace coolant regularly (recommended)2 years or 2,000 hours).

2、eachClean radiator and replace lubrication oil filter for 500 hours.

3、Avoid long-term low-load operation (which tends to lead to the combustion of room carbon).

If the above steps cannot be resolved, it is recommended to contact the Kubota aftermarket or professional repair staff to avoid further engine damage.

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