Yanmar L100N Solenoid Timer Relay - OEM Number: 129211-77920

The Yanmar L100N Solenoid Timer Relay (OEM 129211-77920) is a direct replacement electrical control component designed for use on a range of Yanmar diesel engines, including the L100 series. It controls the operation timing of the fuel shut-off solenoid and associated starting or flameout systems, ensuring reliable engine start-up, shutdown, and protection functions.

Manufactured to OEM specifications, this timer relay is engineered for dependable switching performance, accurate timing control, and durability in demanding operating environments. It forms part of the engine’s electrical management system, coordinating timed electrical signals to critical engine control components.

FUNCTION AND OPERATION

• Controls timed operation of the fuel shut-off solenoid
• Assists reliable engine start and shutdown procedures
• Manages electrical timing functions within the engine system
• Supports flameout and engine protection functions (application dependent)
• Designed for continuous operation under vibration and thermal cycling

TECHNICAL DETAILS

• OEM Part Number: 129211-77920
• Type: Solenoid timer relay / timer unit
• Function: Timed electrical control component
• Application: Diesel engine electrical and shutdown system
• Construction: Enclosed electronic relay module with integrated connector terminals
• Design: OEM-configured for direct-fit compatibility and reliable timing operation

Some suppliers also reference this component as a “Timer Relay”, “Flameout Relay”, or “Glow Plug Timer Unit” depending on engine application and system configuration.

TYPICAL APPLICATIONS

Suitable for a range of Yanmar engine applications, including:

• Yanmar L100N diesel engines
• Yanmar L48 and L70 engine series
• Yanmar TNV series engines (selected models)
• Compact construction and plant equipment
• Generators and auxiliary power units

OEM references for part number 129211-77920 list compatibility with multiple Yanmar engine platforms including L-Series and TNV engines.

IMPORTANT INFORMATION

Always confirm the correct OEM part number and engine model before ordering, as timer relay specifications, connector types, and operating characteristics may vary depending on engine configuration, electrical system design, and serial number range. Faulty timer relays can cause intermittent shutdown, starting issues, or fuel solenoid malfunction within diesel engine systems.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£27.50 for delivery before 10:30am
£20.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.