LONCIN LC1P88F-1 Service Manual
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LONCIN LC1P88F-1 Service Manual

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LC1P88F-1·LC1P90F-1
LC1P92F-1
SERVICE MANUAL
LONCIN MOTOR CO., LTD.

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Summary of Contents for LONCIN LC1P88F-1

  • Page 1 LC1P88F-1·LC1P90F-1 LC1P92F-1 SERVICE MANUAL LONCIN MOTOR CO., LTD.
  • Page 2 SAFETY PRECAUTIONS Thoroughly read this MANUAL before Hot Exhaust operating and servicing the generator set. • Muffler temperature is very high during Safe operation and top performance can engine’s running, and even remains hot after only attained when equipment engine has been stopped for a while. Be operated and maintained properly.
  • Page 3 SAFETY PRECAUTIONS • Children, persons who haven’t read this Manual, or haven’t be trained are prohibited from using the engine. • Never repair the machine at will without mastering the method for repairing the engine. • Don’t modify the machine or change its structure at will;...

  • Page 4: Table Of Contents

    CONTENTS Parameters SECTION 1 1-1 Engine Structure ..............1 1-2 Product Technical Parameters ............2 1-3 Drawings of Mounting Dimensions ............. 3 1-4 Drawings of P.T.O Dimensions ............4 1-5 Diagram of Electrical Wiring ............5 SECTION 2 SERVICE INFORMATION 2-1 Precautions for Maintenance ............
  • Page 5 CONTENTS 4-10 Cylinder Compression Check ............25 4-11 Spark Plug Check ..............25 Disassembly and Service SECTION 5 5-1 Precautions for Disassembly ............26 5-1-1 Disassembly ..............26 5-1-2 Reassembly ..............26 5-2 Disassembly and Service of Engine ........... 27 5-2-1 Air Cleaner ...............

  • Page 6: Engine Structure

    SECTION 1 Parameters 1-1 Engine Structure STARTER OUTER CASE FAN COVER COMP. CONTROL ASSY CYLINDER CLEANER CARBURETOR HEAD COVER CAP ASSEY DRAIN PLUG BOLT STARTER SPARK REGULATOR MOTOR PLUG CAP RECTIFIER - 1 -...

  • Page 7: Product Technical Parameters

    SECTION 1 Parameters 1-2 Product Technical Parameters Model LC1P88F-1 LC1P90F-1 LC1P92F-1 Type Single cylinder, 4-Stroke, Forced Air Cooling, OHV Displacement(cc) Cylinder bore × 88×68 90×68 92×68 Stroke(mm) power (KW/3600rpm) Net torque (N·m/rpm) 24 /2600 26 /2600 28/2600 Idle speed ( r/min ) 1850±150...

  • Page 8: Drawings Of Mounting Dimensions

    SECTION 1 Parameters 1-3 Drawings of Mounting Dimensions - 3 -...

  • Page 9: Drawings Of P.t.o Dimensions

    SECTION 1 Parameters 1-4 Drawings of P.T.O Dimensions Shaft A/Type A Shaft B /Type B - 4 -...

  • Page 10: Diagram Of Electrical Wiring

    SECTION 1 Parameters 1-5 Diagram of Electrical Wiring BLACK YELLOW YELLOW Black BLACK YELLOW YELLOW WIRE CONNECTOR IGNITION SPARK CHARGE RED WIRE RECTIFIER MAIN WIRE COIL PLUG COIL HARNESS - 5 -...

  • Page 11: Section 2 Service Information

    2-1 Precautions for Maintenance 5. Clean parts in cleaning solvent upon disassembly. Lubricate sliding surfaces before reassembly. 1. Parts, oil and grease must be genuine LONCIN products or products designated by LONCIN. Parts meeting LONCIN’s design specifications may damage the device or engine.

  • Page 12: Serial Number Location

    The engine’s serial number is stamped on the crankcase as shown below. You will need this information for inquiring about the engine or for ordering parts when a device under the warranty of Loncin’s dealer needs correct parts. ENGINE MODEL SERIAL NO.

  • Page 13: Maintenance Standard

    SECTION 2 SERVICE INFORMATION 2-3 Maintenance Standard Unspecified unit: mm 1P90F-1 1P88F-1 Part Item Standard Service limit Standard Service limit Idle speed － 1850±150 － 1850±150 Engine Compression pressure(kg/cm2) － － Cylinder Warpage － 0.10 － 0.10 head Sleeve (I.D. r X) 88～88.01 88.1 90～90.01...
  • Page 14 SECTION 2 SERVICE INFORMATION 1P92F-1 Part Item 标准 标准 Idle speed 1800±100 － Engine Compression pressure(kg/cm2) * Cylinder head Warpage － 0.10 Sleeve (I.D. r X) 92～92.01 92.1 Cylinder Sleeve (I.D. r Y) 92～92.01 92.1 Skirt O.D. 91.94 91.96～91.975 Clearance to cylinder 0.025～0.045 0.055 Piston...

  • Page 15: Fastener Torque Specification

    SECTION 2 SERVICE INFORMATION 2-4 Fastener Torque Specification (1)Torque Specification Torque Item Thread specification range(N.m) 16-18 Connecting rod bolt M8×1 50-55 Cylinder head bolt M10×1.25 90-115 Flywheel mounting nut M16×1.5 Crankcase cover bolt 24-28 M8×1 18-23 Oil drain bolt (in crankcase) M16×1.5 6-10 Air cleaner mounting nut...

  • Page 16: Section 3 Maintenance

    SECTION 3 MAINTENANCE 3-1 Maintenance schedule First Every Every Every year Every Each Maintenance schedule month months months or years 5 hours 25 hours 50 hours hours 200 hours Oil level ● Engine oil replace ● ● Check ● cleaner Clean ●(1) element...

  • Page 17: Engine Oil

    SECTION 3 MAINTENANCE 3-2 Engine Oil OIL FILLER CAP/DIPSTICK Note: Drain the oil while the engine is stopped yet warm to ensure rapid and complete draining. 1、 lean the area around the oil filler /cap/dipstick and oil drain bolt. Remove the oil filler cap/dipstick. 2、...
  • Page 18 SECTION 3 MAINTENANCE 3-3 Air Cleaner 1. Remove the air cleaner’s handle bolt and air cleaner cover. Remove the locknut, then remove the platen. Remove the element from the air cleaner base. 2、 Carefully check each element for holes or tears. Replace any damaged element. BOLT Compressed air blows CLEANER...

  • Page 19: Spark Plug

    SECTION 3 MAINTENANCE 3-4 Spark Plug or a spark plug of an Recommended types: RC12YC equivalent grade. Replacing the spark plug has the following positive effect: Ensuring continuous production of sparks, more reliable starting, and saving of fuel. CAUTION Spark plugs of a wrong model or incorrect heat range can cause engine damage. 1.

  • Page 20: Carburetor

    SECTION 3 MAINTENANCE 2. Measure the clearance between the rockerarm and the valve stem with a feeler gauge. Intake: 0.15±0.02 mm Exhaust: 0.20±0.02 mm 3. To adjust valve clearance, hold the rocker arm pivot FEELER and loosen the pivot lock nut. GAUGE 4.

  • Page 21: Oil Filter Replacement

    SECTION 3 MAINTENANCE 3-8 Oil Filter Replacement If you engine has an oil filter, replace it at lease once a season. 1、 Use an oil filter spanner or a pipe spanner to rotate the oil filter counter clocker, and to replace it. OIL FILTER 2、...

  • Page 22: Troubleshooting

    SECTION 4 Troubleshooting 4-1 Hard Starting ENGINE FLOODED too much fuel (TRY AGAIN AFTER A FEW MINUTES) FUEL LEVEL too low (ADD FUEL INTO FUEL TANK) FUEL SYSTEM FUEL FILTER clogged (WASH FUEL FILTER) CARBURETOR faulty or out of adjustment (SEE 5-2-4) AIR CLEANER dirty (SEE 3-3)

  • Page 23: Low Power

    SECTION 4 Troubleshooting 4-2 Low Power FUEL QUALITY poor CLEAN FRESH FUEL OF DESIGNATED QUALITY INTO TANK FUEL FILTER clogged (WASH FUEL FILTER) FUEL SYSTEM CARBURETOR faulty or out of adjustment (SEE 5-2-4) CHOKE not fully open (OPEN MAXIMALLY) AIR CLEANER dirty (SEE 3-3) SPARK PLUG faulty IGNITION...

  • Page 24: Speed Unstable

    SECTION 4 Troubleshooting 4-3 Speed Unstable FUEL low / poor quality / contaminated CLEAN FRESH FUEL OF DESIGNATED QUALITY INTO TANK FUEL FILTER clogged FUEL SYSTEM (WASH FUEL FILTER) CARBURETOR clogged (SEE 5-2-4) SPARK PLUG IGNITION faulty IGNITION (SEE 3-4) SPEED SYSTEM UNSTABLE...

  • Page 25: Exhaust Color Abnormal

    SECTION 4 Troubleshooting 4-4 Exhaust Color Abnormal AIR CLEANER dirty (SEE: 3-3) CARBURETOR faulty BLACK (SEE: 5-2-4) LOAD excessive (REMOVE EXTRA LOAD) ENGINE temperature too low EXHAUST (WHEN STARTING NORMALLY) COLOR WHITE ABNORMAL FUEL mixed with water (USE CLEAN FRESH FUEL OF DESIGNATED QUALITY) FUEL mixed with engine oil ( USE CLEAN FRESH FUEL OF DESIGNATED...

  • Page 26: Engine Liable To Stall

    SECTION 4 Troubleshooting 4-5 Engine Liable to Stall SPARK PLUG dirty and wet (SEE 3-4) CARBURETOR fuel level too high ENGINE (ADJUST CARBURETOR FLOAT HEIGHT) LIABLE TO STAL CARBURETOR IDLING out of adjustment (SEE 3-6) CARBURETOR insulation damaged (SEE 5-2-4) 4-6 Engine Speed Does Not Increase SPARK PLUG dirty and wet (SEE 3-4)

  • Page 27: Engine Overheating

    SECTION 4 Troubleshooting 4-7 Engine Overheating IGNITION time wrong (ADJUST IGNITION TIME) ENGINE OIL insufficient ordirty (ADD OR CHANGE OIL) MUFFLER OR EXHAUST PIPE clogged (SEE 3-9) ENGINE OVERHEATING PISTON RING faulty causing blow-by between cylinder and crankcase (REPLACE WORN PARTS) ENGINE speed too high (CHECK AND REPAIR GOVERNOR SYSTEM OR REPLACE GOVERNER GEAR)

  • Page 28: Engine's Abnormal Sound

    SECTION 4 Troubleshooting 4-8 Engine’s Abnormal Sound PISTON AND PISTON RINGS worn (REPLACE PISTON AND PISTON RINGS) CONNECTING ROD, PISTON PISTON PIN BORE worn KNOCKING (REPLACE WORN PARTS) SOUND Piston pin-to-connecting rod clearance too (REPLACE WORN PARTS) PISTON RING broken (REPLACE PISTON RING) COMBUSTION CHAMBER carbon deposit too much...

  • Page 29: Electric Starting System Failure

    SECTION 4 Troubleshooting 4-9 Electric Starting System Failure Battery faulty (CHARGE OR REPLACE) WIRE OR CONNECTOR short-circuited or broken (REPAIR OR REPLACE) FUSE burn out DOES RELAY (REPLACE) (SWITCH) HAS ENGINE SWITCH faulty CLICKING SOUND? (REPAIR OR REPLACE) BATTERY VOLTAGE insufficient (CHARGE OR REPLACE) WIRE OR CONNECTOR short-circuited or broken...

  • Page 30: Cylinder Compression Check

    SECTION 4 Troubleshooting 4-10 Cylinder Compression Check 1) Remove spark plug cap and spark plug. 2) Install a compression gauge in the spark plug hole. 3) Use a particular dynamometer to start the engine, then measure cylinder compression. Speed 1400rpm, Cylinder compression 8.0～10.0 Kgf/cm2...

  • Page 31: Disassembly And Service

    SECTION 5 Disassembly and Service 5-1 Precautions for Disassembly 5-1-1 Disassembly 1. Be familiar with the machine’s structure and working principles before disassembly, it is the prerequisite of correct disassembly. 2. Try best not to detach the parts that can avoid being detached. Aimless detaching not only increases work load of the repair, but also deteriorates the originally good fitting relation between parts and fitting accuracy, which leaves new hazards of failure.

  • Page 32: Disassembly And Service Of Engine

    SECTION 5 Disassembly and Service 5-2 Disassembly and Service of Engine 5-2-1 Air Cleaner Disassembly 1) Remove the 2 M6 nuts and M6×35 bolts used to fix the air cleaner, detach the breather tube, remove the air cleaner 2) Pull the breather tube’s other end out of the crankcase to remove the breather tube. Precautions for reassembly: 1) Confirm no installation of any of the air cleaner’s gaskets is missing, and assembly is correct.

  • Page 33: Cooling Fan, Fan Cover

    SECTION 5 Disassembly and Service 5-2-2 Cooling Fan, Fan Cover Disassembly 1) Remove the 4 hexagon shoulder bolts, and detach fan cover comp. and cooling fan cover. 2) Remove the M16 nuts, and detach starter pulley and cooling fan. Precautions for reassembly: 1) Three pins on the back side of the cooling fan must be aligned with the three holes on the flywheel that are near the cylindrical surface, the starter pulley is positioned on the cooling fan.

  • Page 34: Governor System

    SECTION 5 Disassembly and Service 5-2-3 Governor System DISASSEMBLY 1) Use a pair of long nosed pliers to remove the governor spring, then remove nuts and governor arm bolt, and remove governor arm and governor rod. 2) Remove the hexagon shoulder bolts and choke stay, detach the choke rod from the carburetor’s choke lever hole and choke stay hole, detach choke rod from choke stay hole and control assembly.

  • Page 35: Carburetor

    SECTION 5 Disassembly and Service 5-2-4 Carburetor DISASSEMBLY 1) Remove air cleaner packing, fuel tube, governor rod, and choke rod, remove the carburetor. 2) Remove M6×12 hexagon flange bolts, detach the cylinder head shroud, carburetor packing, carburetor insulator, and intake pipe packing. 3) Remove gasoline pump bracket, detach the gasoline pump.
  • Page 36 SECTION 5 Disassembly and Service Oil drain plug must be loosened before removing and repairing carburetor to drain off fuel, smoking and flame are prohibited. CARBURETOR BODY REASSEMBLY: Clean thorough with compressed before PILOT SCREW PILOT installation. RESSEMBLY: Check for wear on front end, then install it.

  • Page 37: Flywheel, Ignition Coil, Starter Motor

    SECTION 5 Disassembly and Service 5-2-5 Flywheel, Ignition Coil, Starter Motor DISASSEMBLY 1) Remove two M6×25 bolts, swallow-tailed clamp, flameout wire, and remove ignition coil. 2) Don’t knock the flywheel with a hammer, use a available flywheel puller to remove the flywheel; the flywheel puller should avoids the magnet section of the flywheel.
  • Page 38 SECTION 5 Disassembly and Service Ignition coil gap adjustment When reinstalling the ignition coil, adjust the ignition coil gap. 1) Lightly tighten ignition coil mounting bolt. 2) Insert the feeler gauge or a piece of paper of the same thickness between the flywheel and ignition coil as shown.

  • Page 39: Cylinder Head, Valves

    SECTION 5 Disassembly and Service A false reading will result if the spark plug cap is not removed. 5-2-6 Cylinder Head, Valves DISASSEMBLY 1) Remove cylinder head bolt, and remove cylinder head cover and cylinder head cover gasket. plate assembly, push rod, and spark plug. 2) Remove rocker arm component, 3) Remove four M10×85 cylinder head bolts, remove cylinder head, cylinder head gasket, then remove valves.
  • Page 40 SECTION 5 Disassembly and Service DISASSEMBLY/REASSEMBLY VALVE (IN) VALVE (EX) REASSEMBLY: REASSEMBLY: Don’t interchange Check to confirm the with exhaust tapered face has no VALVE KEEPER valve. CYLINDER damage, and there is REASSEMBLY: Take great care not HEAD much carbon Confirm the keepers damage valve...
  • Page 41 SECTION 5 Disassembly and Service Valve spring free length Measure free length of valve spring. Standard Service limit 39.5mm~40.5 mm 39mm Replace the spring if it is shorter than the standard value or beyond service limit. Valve seat width Remove carbon deposits from the combustion chamber, check the valve seat for pitting or other damage.
  • Page 42 SECTION 5 Disassembly and Service stem O.D. Service limit Standard 6.565~6.580 mm 6.550mm 6.545~6.560mm 6.530mm Replace the valves if stem O.D. is smaller than the service limit. Valve guide I.D. Ream the exhaust valve guide to remove any carbon deposits before measuring.
  • Page 43 SECTION 5 Disassembly and Service Cylinder head service EXHAUST VALVE Exhaust valve guide replacement GUIDE The intake valve guide is not replaceable. If the intake valve guide is beyond the service limit due to wear, replace the cylinder head. Replace the cylinder head HOT PLATE 1.
  • Page 44 SECTION 5 Disassembly and Service valve guide until the clip is fully seated as shown. 6. After installation, inspect the valve guide for damage. Replace the guide if it is damaged. Exhaust valve guide reaming For best results, be sure the cylinder head is at room temperature VALVE GUIDE REAMER...
  • Page 45 SECTION 5 Disassembly and Service Turn the cutter clockwise, never counterclockwise. Continue to turn the cutter as you lift it from the valve seat. CONTACT TOO HIGH 5. Using the 30°~32° and 60° cutters to narrow and adjust the valve seat so that it contacts the middle of the valve face. The 30°~32°...

  • Page 46: Crankcase Cover, Governor Gear

    SECTION 5 Disassembly and Service 5-2-7 Crankcase Cover, Governor Gear DISASSEMBLY 1) Loosen off the M6×35 bolt, remove the oil filler cap/dipstick, and use a special tool to remove oil filter. 2) Loosen off 3 M6×16 bolts, remove oil pump cover, seal ring and take out oil pump assembly. 3) Loosen off crankcase cover bolts, remove crankcase and disassemble it.

  • Page 47: Crankcase, Crankshaft, Piston

    SECTION 5 Disassembly and Service 5-2-8 Crankcase, Crankshaft, Piston DISASSEMBLY 1) Loosen off 2 M6×12 bolts, remove breather chamber cap, breather chamber packing, then loosen off 1 M6×12 bolt, remove the reed valve. 2) Remove balancer weight A, balancer weight B, camshaft, and valve lifters. 3) Loosen off connecting rod blots, remove connecting rod cap, crankshaft, governor arm shaft, connecting rod, piston, piston rings, etc.
  • Page 48 SECTION 5 Disassembly and Service 2. Piston / Piston ring REASSEMBLY: Install all rings with the markings facing upward. Be sure that top and second rings are not interchanged. Check that the rings rotate smoothly after installation. Space the piston ring end gaps 120 degrees apart, and do not align the gaps with the piston pin.
  • Page 49 SECTION 5 Disassembly and Service Valve timing Balancer weight After installing the crankshaft, align the punch marks on timing mark the timing gears. Camshaft timing mark TIMING GEAR DISASSEMBLY: 1. Scribe a line on the crankshaft and the timing gear tooth as shown. BALANCER WEIGHT TIMING GEAR 2.
  • Page 50 SECTION 5 Disassembly and Service BALANCER A 4. Align the punch marks on Balancer A and Balancer B when installing Balancer B. After installation, check whether camshaft, crankshaft, Balancer A, and Balancer B are installed in proper positions, and can rotate easily. PUNCH MARK Balancer B...
  • Page 51 SECTION 5 Disassembly and Service PISTON AND PISTON RINGS Inspect contact between piston and piston rings, defects of piston grooves, burn, cracks and other defects on piston top. If the damage is severe (such as brokerage), replace the damaged part. Removal of carbon deposit Carbon deposits gather on piston top and upper edge of cylinder.
  • Page 52 SECTION 5 Disassembly and Service PISTON RING END GAP Standard Service limit 0.15mm~0.30mm 1.0 mm Second 0.25mm~0.40mm 1.0 mm Before measuring ring end gap, use the piston top to position the ring so it will not be cocked in the cylinder bore. Inspection of connecting rod If the connecting rod is bent or twisted, or its big end’s bearing bush and small end shaft housing’s outer ring has play, or one of its sides has cracks, the connecting rod must be scrapped and replaced with a new one.
  • Page 53 SECTION 5 Disassembly and Service CONNECTING ROD BIG END SIDE CLEARANCE Standard Service limit 0.025mm~0.35mm 0.4 mm CONNECTING ROD BIG END OIL CLEARANCE (RADIAL) 1) Clean all oil from crank pin surface and its inner side. 2) Place a piece of plastigauge on crank pin, install connecting rod, and tighten the bolts to the specified torque.
  • Page 54 SECTION 5 Disassembly and Service CAM HEIGHT Standard Service limit 32.563mm~32.603m Replace if smaller than 32.4 mm 32.049mm~32.099m Replace if smaller than 31.9 mm CAMSHAFT O.D. Standard Service limit 15.966m m~15.984mm 15.946 mm Note the location of the decompression mechanism, check to be sure it moves freely.

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Lc1p90f-1Lc1p92f-1

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