LONCIN LC178FD User manual

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Thank you for purchasing a Loncin product.
Keep this owner's manual handy, so you can refer to it at any time.
This owner's manual is considered a permanent part of the engine and should remain with
the engine if resold.
The information and specifications included in this publication were in effect at the time of
approval for printing.
Only the D Type is equipped for both electric and manual starting.

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READ THIS OWNER’S MANUAL CAREFULLY. Pay special attention to these symbols and
any instructions that follow:
Indicates serious injury or death will result if instructions are not
followed.
Indicates a strong possibility that serious injury or death could result
if instructions are not followed.
Indicates a possibility that minor injury or an result if instructions are
not followed.
Indicates that equipment or property damage can result if
instructions are not followed.
NOTE: Gives helpful information.
If a problem should arise, or if you have any questions about your engine, consult your
engine dealer.

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CONTENTS
1. Engine Safety.........................................................................................4
2. Specifications.........................................................................................5
3. Name Of Parts........................................................................................6
4. Installation...............................................................................................7
5. Operation................................................................................................8
6. Periodic Checks And Maintenance........................................................15
7. Long Term Storage................................................................................19
8. Performance Curves..............................................................................20
9. Troubleshooting.....................................................................................21
10. Overall Dimensions And Installation....................................................21
11. Bolt Torque Specifications...................................................................24

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1. Engine Safety
The engines are designed to give safe and dependable service if operated according to
instructions. Read and understand this owner’s manual before operating the engine.
Failure to do so could result in personal injury or equipment damage.
Preventing Fires
Never add fuel to the fuel tank while the engine is running.
Wipe away all fuel spills with a clean cloth.
keep the engine at least 3 feet (1 meter) away from building walls and
other equipment during operation. Do not place flammable objects
close to the engine.
Carbon Monoxide Hazard
Exhaust gas contains poisonous carbon monoxide. Avoid inhalation of
exhaust gas.
Never run the engine in a closed garage or confined area.
Preventing Burns
The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Be careful not to touch the muffler
while it is hot. Let the engine cool before storing it indoors.
Preventing Engulfment
●Keep away from rotating parts while the engine is running.
●When the engine is coupled with a machine ,be sure to provide covers
for the belt, coupling and other dangerous parts.

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2. Specifications
Model LC178F(D) D350F(D) LC186F(D) D440F(D)
Type Single cylinder, vertical cylinder, 4stroke, forced cooling , direct
injection
Bore × Stroke (mm) Ø78x73 Ø86x76
Displacement（L）0.349 0.441
Compression ratio 21
Rated power
（kW/rpm）4.9/3600 6.8 /3600
PTO shaft rotation Anti-clockwise(from PTO side)
Fuel tank capacity
（L）3.7 4.7
Lube oil capacity（L）1.1 1.6
Starting system Recoilstart (LC178F LC186F)
Electric start+ Recoil start (LC178FD LC186FD)
Lubrication system Forced lubrication
Valve Clearance
（mm）
Input valve：0.10～0.15
Output valve：0.15～0.20
Fuel supply advance
angle （°）18±1
Battery capability 12V36Ah
Dimension 390×430×460 399×475×500
Net weight（kg）With electric start ≤44
Without electric start ≤39
With electric start ≤51
Without electric start ≤47
The power rating of the engine indicated in this document is the net power output tested on
a production engine for the engine model and measured in accordance with SAE J1349 at
3,600 rpm (Net Power).Mass production engines may vary from this value.
Actual power output for the engine installed in the final machine will vary depending on
numerous factors, including the operating speed of the engine in application, environmental
conditions, maintenance, and other variables.

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3. Name Of Parts
Fuel injection
Dipstick
Speed lever
Fuel injection pump
Fuel tank
Air cleaner
Muffler
Drain plug
Grip
Start motor
Starting key
PTO shaft
Fuel cock
Drain plug
Dipstick

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4. Installation
Use an engine mount which is strong enough to prevent misalignment and play during
engine operation.
Ensure accurate centering for coupling with the output shaft.
For belt driving, select a pulley which is a suitable size for the engine and which
matches the revolution speed and pulley size of the driven machinery. The proper
pulley size for the engine can be obtained by the following formula:
speedservicesEngine'
speedrevolutionmachineryDriven.diapulleymachineryDriven
Dia.pulleys'Engine


Too much tightness overloads the engine at starting and stretcher
the belt, making it prone to damage. The output shaft may also be
broken, and other accidents could occur. Too much looseness causes belt slippage
during high output and high speed operation.
Inclination angle
Allowable inclination(for continuous use) (θ＜200)

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5. Operation
（1）.Preparations For Starting
1). Check The General Condition Of The Engine
Look around and underneath the engine for signs of oil or fuel leaks.
Look for signs of damage.
Check that all shields and covers are in place, and all nuts, bolts, and screws are
tightened.
2). Engine Oil Level Check
Check the engine oil level with the engine stopped and in a level
position.
Remove the filler cap/dipstick and wipe it clean.
Insert and remove the dipstick without screwing it into the filler neck. Check the oil level
shown on the dipstick.
If the oil level is low, fill to the edge of the oil filler hole with the recommended oil.
Screw in the dipstick securely.
Service categories: API service categories CD or higher
SAE 15W-40 is recommended for general, all-temperature use. Other viscosities shown in
the chart may be used when the ambient temperature in your area is within the indicated
range.
Dipstick Upper limit
Lower limit
Oil filler hole

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3). Refueling
With the engine stopped, remove the fuel tank cap and check the fuel level. Refill the tank if
the fuel level is low.
Only fill the fuel tank with diesel fuel. Filling the fuel tank with
gasoline many result in a fire
（2）. Starting The Engine
1).Recoil Starting
①Move the fuel valve lever to the ON position.
②Set the engine speed lever at ＂START＂Position, turn the engine speed control knob
to right.
Maximum fuel level
ON

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③Pull the starter grip lightly until you feel resistance. ATTENTION：slowly
④Slowly return the starter grip to the initial position. ATTENTION：return the grip
⑤Hold the starting handle firmly ,pull the starter grip all the way out with a strong and
even motion, then return it to slowly. Use two hands if necessary.
ATTENTION: strong and quickly pull.
⑥If the engine doesn’t start, try again from ③.
Do not allow the starter to snap back against the engine.
Return it gently to prevent damage to the starter.

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2). Electric Starting
①Move the fuel valve lever to the ON position.
②Set the engine speed lever at ＂START＂Position.
③Turn the starting key to “START”.
④Remove your hand from the key as soon as the engine starts.
⑦If the starting motor doesn’t start after 10 seconds, wait a while(for about 15 seconds)
before attempting to start again.
When the engine is difficult to start in cold weather, Press the heater button for about 10-20
seconds and then release, you can easily start the engine.
If the starting motor is turned for too long, the battery will go flat and the motor
will seize up.
When the engine is stopped , the starting key switch is turned clockwise to the “ON”
position, then the oil pressure Indicator light is on.
When the engine is running , the start switch key stop in the “ON” position, the oil
pressure indicator light goes out, if the light stays lit, you should stop to check the
oil level.
Starting switch key
Heater button
Indicator light

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Wiring Diagram

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（3）.Operating your engine
1) Warm up the engine without load for about 3 minutes.
2) Turn the engine speed lever to the desired speed position and fasten the thumb nut.
1) During the initial 20 hours is new engine break in, avoid prolonged operation at
minimum or maximum engine speeds and loads. Check oil after the engine break-in
period.
2) If you notice any abnormal sound，vibrato or running rough, The color of the
exhaust gas always blueness or white, stop the engine and consult your nearest
dealer.
1) Never run the engine if the ambient temperature is above +40℃or below -10℃.
2) At high altitudes the engine will lose power, run rough ,and produce exhaust
gases that exceed the design specifications.
1) If the engine has been running, the muffler will be very hot，Be careful not to
touch the muffler.
2) Never refill the fuel while the engine is running.
（4）. Stopping your engine
1) Before stopping the engine, move the engine speed lever to low speed, and run the
engine for about 3 minutes with no load.
2) Turn the engine speed control knob to the left, Return the engine speed lever to the
“STOP” position.

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3) In electric-start models, return the starter key to the “OFF” position.
4) Set the fuel cock lever to “OFF” (closed) position.
5) Pull the recoil starter slowly, stop when it feels tight.
When stopping the engine, reduce the load slowly. Don’t stop the
engine suddenly since this may cause the temperature to rise abnormally.

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6. Periodic checks and maintenance
Periodic checks and maintenance are very important for keeping the engine in good
condition and durable. The chart below indicates which checks to make and when to make
them.
The mark (▲) indicates that special tools and skills are required.
Item Daily 20 hours 100 hours 200 hours 500 hours 1000hours
Check and tighten
bolt and nuts
○Before
operation
Check and
resupply engine oil
○Before
operation
Replace engine oil ○1st time ○2nd &
after
Clean oil filter
replace if damaged ○1st time ○2nd &
after
Check oil leakage
○Before
& after
operation
Clean or replace air
cleaner element
Service more frequently when used in
dusty areas ○
Drain and clean the
fuel tank
○
Check and replace
fuel filter
○
Check fuel injection
nozzle
▲
Check fuel injection
pump
▲
Check fuel piping
replace if damaged
○
Adjust intake/exhaust
valves head clearance ▲1st time ▲
Check and lap
intake/exhaust valves
seat
▲
Replace piston
rings
▲
Check battery liquid ○Before
operation
Operation
hours

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(1).Engine oil change
Drain the used oil while the engine is warm. Warm oil drains quickly and completely.
1) Place a suitable container below the engine to catch the used oil, and then remove the
filler cap/dipstick and the drain bolt.
2) Allow the used oil to drain completely, and then reinstall the drain bolt, and tighten it
securely.
3) With the engine in a level position, fill to the outer edge of the oil filler hole with the
recommended oil.
Please dispose of used motor oil in a manner that is compatible with the
environment. We suggest you take used oil in a sealed container to your local
recycling center or service station for reclamation. Do not throw it in the trash; pour
it on the ground; or down a drain.
(2).Clean/inspect engine oil filter
Remove the oil filter, clean oil filter or replace if damaged, and then install the oil filter.
(3). Air filter inspection
A dirty air filter will restrict air flow to the firebox, reducing engine performance. Lower the
clamp, remove the air cleaner cover and inspect the filter.
Operating the engine without an air filter, or with a damaged air filter,
will allow dirt to enter the engine, causing rapid engine wear.
Oil filter

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1）Dry-type air cleaner
Unsnap the air cleaner cover clips, remove the air cleaner cover, Tap the filter element
several times on a hard surface to remove dirt, or blow compressed air [not exceeding 30
psi (207 kPa)] through the filter element from the inside，replace dirty filter element if
damaged.
2）Oil bath type air cleaner
Check oil level before operation and clean air cleaner elements every 50 hours.
①Stop the engine , let it sit for 10 minutes. Lower the clips, remove the oil pan and the air
cleaner elements.
②Clean the oil pan.
③Wash the air cleaner elements with diesel fuel, blow out excess fuel with compressed air.
④Make sure that the sealing ring are in a good condition and replace them if they are
damaged.
⑧Fill engine oil pan of air cleaner to marked oil level.
⑨Replace the air cleaner elements and oil pan.
Air cleaner element
Air cleaner element
Clip
Oil pan
Sealing ring
Clip

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(4) Clean or replace inlet fuel screen and outlet fuel filter
1) Remove the fuel cap, lift out the inlet fuel screen, clean the inlet fuel screen or replace if
damaged. Replace the inlet fuel screen and hand tighten the fuel cap.
2) Remove the fuel cap and the inlet fuel screen, the tank drain plug and the gasket to drain
the fuel. Loosen the nuts and remove the cock, pull out the fuel filter. Install a new fuel filter
and seals through the fuel tank filler port and seat in the fuel tank. Fasten the assembly to
the tank using the fuel cock nuts. Tighten the fuel tank drain plug and gasket.

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(5) Check the battery
Check the electrolyte level to be sure that it is between the marks on the case. If the level is
below the lower mark, remove the caps and add distilled water to bring the electrolyte level
to the upper mark. The cells should be equally full.
Do not reverse polarity. Serious damage to the engine and/or battery
may occur.
7. Long term storage
If store your engine for long periods, make the following preparations.
1) Operate the engine for about 5 minutes and then stop.
2) Stop the engine, drain the engine oil while the engine is still warm and fill with new oil.
3) Pull the recoil starter slowly, Stop when it feels tight. This closes the intake and exhaust
valves (in compression position) and helps prevent rust from forming.
4) Wipe the oil and dirt from the engine and store in a dry place.
LOWER LEVEL
UPPER LEVEL