LONCIN D440FD User Manual

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Table of Contents

Questions and Answers:

M
Mary ChandlerAug 7, 2025
What to do if my LONCIN Engine does not start?
- S
  stevenowensAug 7, 2025
  If the LONCIN Engine does not start, several factors could be at play. First, ensure that the fuel system is adequately supplied with diesel fuel by refueling it. If the diesel fuel is not the recommended type, refuel with the correct one. A clogged fuel filter could also be the issue, so replace it. Furthermore, faulty spraying of the fuel injection could be preventing the engine from starting; in that case, purge or replace the fuel injection. Finally, check the electrolyte, recharge it, clean the terminals, and retighten them.
H
Heidi McdowellAug 21, 2025
Why does my LONCIN D440FD lack power?
- J
  John AlexanderAug 21, 2025
  If your LONCIN Engine lacks power, it might be due to a clogged fuel system. Try purging or replacing the fuel valve, filter, or cock. Another potential cause is faulty spraying of the fuel injection, in which case you should purge or replace it. Also, check the fuel injection pump for faults and purge or replace it if necessary. Finally, a clogged air cleaner element could be the culprit, so clean or replace the filter element.

LONCIN D440FD Specifications

General

Displacement	438 cc
Bore x Stroke	90 mm x 66 mm
Compression Ratio	8.0:1
Fuel System	Carburetor
Fuel Type	Gasoline
Engine Type	Single cylinder, 4-stroke
Starting System	Electric start / Recoil start
Fuel Tank Capacity	6.5 liters
Oil Capacity	1.1 liters

Summary

Safety Symbols and Warnings

DANGER Symbol Explanation

Indicates serious injury or death if instructions are not followed.

WARNING Symbol Explanation

Indicates strong possibility of serious injury or death if instructions are not followed.

CAUTION Symbol Explanation

Indicates possibility of minor injury if instructions are not followed.

NOTICE Symbol Explanation

Indicates equipment or property damage if instructions are not followed.

Engine Safety Precautions

Preventing Fires

Never add fuel while the engine is running; keep engine away from buildings.

Carbon Monoxide Hazard

Exhaust gas contains poisonous carbon monoxide. Avoid inhalation.

Preventing Burns

Muffler remains hot after stopping. Avoid touching.

Preventing Engulfment

Engine Specifications

Engine Installation Guidelines

Engine Operation: Preparations

Pre-Start Checks and Preparation

Engine Oil Level Check

Engine Operation: Refueling and Starting

Fueling the Engine

Recoil Starting Procedure

Engine Operation: Electric Starting

Electric Starting Procedure

Engine Operation: Running and Stopping

Engine Operation and Warm-up

Engine Stopping Procedure

Periodic Maintenance Schedule

Engine Oil and Filter Maintenance

Engine Oil Change Procedure

Troubleshooting Engine Issues

Engine Fails to Start

Engine Lacks Power

Black Exhaust Smoke

Bolt Torque Specifications

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