PTM Engines

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PTM Engines


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Inspection and replacement of engine oil

Inspection of engine oil

Check engine oil and oil level everyday before operation
1、When checking engine oil, the machine shall be stopped and be placed on a horizontal plane. 
2、 Loosen engine oil dipstick and wipe it clean.

3、 Insert engine oil dipstick into oil filler opening, 
but do not tighten it up. Check whether the oil level is between the upper scale and lower scale. If the engine oil level is too low, engine 
oil shall be filled to required oil level.

4、 Re-insert the oil dipstick and tighten it.


Replacement of engine oil

To reach the desired effect, engine oil of your small engine shall be replaced after 25 hours or after one month after its first use, and it shall be replaced every 50 hours or every 3 months afterwards.

1、Preheat the engine for 2-3 minutes and stop the engine. Warning: ensure that the sparking plug wire has been disconnected and keep it far away from sparking plug to prevent accidental starting. Clean around the oil filler opening and oil drain cock and prevent dirt and scrap to fall into crankcase (as shown on the right diagram).

2、 Place a can for oil under the engine.

3、Loosen and remove oil drain bolt and drain the engine oil.

4、 Pull the starter by hand for several times to help drain all the 
residual oil.

5、Put back the oil drain bolt and tighten it.


Engine with oil filter 
If your engine has oil filter, replace it at least once

each season.

1、 Use filter wrench or pipe wrench to counterclockwise rotate oil filter body to replace oil filter.
2、 Check whether there is scrap or filling material on the sealing surface of connecting flange of oil filter and clean it when necessary. 3、Add small quantity of clean engine oil to the filter washer. 
4、 Install new filter, tighten by hand until the gasket clings to 
the connecting flange and crew 1/2 to 3/4 circles to fasten filter


Recommendation of engine oil 
To make engine reach the desired operational effect, you are suggested to use the certified Loncin engine special oil. It is recommended to use SAE 10 W-30 engine oil. When the temperature in your area is within the scope shown in the diagram, you can use engine oil with other viscosity.



Inspection and maintenance of the air filter 

If the filter element of the air filter is too dirty, air intake will be seriously affected and the power of the engine will be decreased and engine performance will be reduced.
Dismantle air filter housing to check the air filter, clean or replace dirty or damaged air filter element. If there is oil-bath air filter, check the oil level. 
Please clean air filter every 50 hours and replace the foam and paper filter element on the air filter every 300 hours or every one year. 
1. Cleaning paper filter element 
Please slightly tap the filter element on hard plane for several times to remove dust accumulated on it, and then blow from inside to outside with compressed air whose pressure is no more than 207KPa. Please replace the filter element in time if the filter element is too dirty or broken. 

2. Cleaning foam filter 
The foam filter can be rinsed in hot water with detergent or can also be cleaned in non-inflammable or high-flash-point solvent; after it is dried, immerse it into clean engine oil, knead evenly and squeeze out engine oil in excess. 
3. Cleaning the oil-bath air filter 
Please replace the engine oil in time if it is too dirty. Evacuate the engine oil in the air filter; thoroughly clean the accumulated dust in the air filter with non-inflammable or high-flash-point solvent, dry the air filter box and pour into the same lubricating oil as gasoline engine until it reaches the oil level mark. 




Inspection and replacement of sparking plugs 


Please replace sparking plugs every 300 hours or every one year. Replacing sparking plugs has the following advantages:
Ensuring continuous sparks more reliable to start more fuel-efficient 
It is crucial to choose suitable sparking plugs for engines, 
and it is recommended to use F7RTC sparking plugs or 
that of the same grade. 
1. Remove sparking plug cap and get rid of the sundries around it. 
2. Remove sparking plug with equipped sparking plug carriage wrench 
3. Clear the carbons fouled sparking plug with gablock and clear the sundries on the sparking plug with brush. 
4. Check whether the sparking plug electrode is ablated. If it is ablated, the sparking plug shall be replaced. 
5. Check the clearance of sparking plug by feeler gauge and adjust the clearance of sparking plug to 0.7-0.8mm. 
6. Check the sealing gasket on sparking plug, If it is seriously distorted or broken, it shall be replaced. 
7. Check sparks: manually start engine and check the color of sparks. The sparks shall be blue and white. 
8. When tightening the spark plug, tighten the sparking plug into place by hand and then tighten up it by sparking plug carriage wrench.













Cleaning the fuel filter system 

Please replace fuel filter in the oil groove every 100 hours or every 6 months. 
1. Turn off the fuel cock and remove sedimentation cup and 
O-ring gasket. 
2. Clean sedimentation cup and O-ring gasket with 
non-inflammable solvent. 
3. Put back sedimentation cup and O-ring gasket.
4. Turn on fuel tap to check whether there is oil leakage. If there is oil leakage, replace O-ring gasket. 
5. Clean fuel filter and filter screen to remove filth on the filter screen and check whether the filter screen is broken. If the filter screen is broken, it shall be replaced in time.

Adjustment of valve clearance 

Note: Unless the user has special maintenance tool and maintenance skills, the adjustment of valve clearance shall be maintained with the assistance of Loncin authorized distributors. 

The size of valve clearance has great impact on the performances of engine on all aspects: 
If the valve clearance is too small, the expanding of valve rod in thermal state of 
the engine may lead to valve leakage and power coastdown or even burn out the valve; 
If the valve clearance is too big, there might be collisions between different transmission parts as well as between the valve and the valve seat, and meanwhile, the valve opening duration will be reduced and cause insufficiency of air intake and exhaust and will also directly affect the normal operation of engine.General speaking, valve clearance of gasoline engine must be checked and adjusted after it is used for 1 year or 300 hours. The valve clearance must be adjusted in cold state and when the valve is totally closed. Place the piston on the dead point of the cylinder combustion chamber, and the positive related position between flywheel magnetic steel and flame igniter is positive point. Insert the feeler in the clearance between the valve rocker and the valve and measure the clearance of the lifter.


Valve clearance: intake valve: 0.10 ~0.15 mm
                            Exhaust valve: 0.15 ~0.20 mm