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NLT1G04454
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Yanmar Thermostart Flame Glow Plug 124450-77910
$24.99
In Stock
$24.99
Sale price
$24.99
Regular price
This new aftermarket thermostart flame plug replaces 124450-77910 and 121023-77910 for compatible Yanmar 2TR16, 2TR22, 3T75U, 3T80-D, 3T84, and related diesel engines.
Estimated delivery between
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Yanmar 2TR16 engine
- Yanmar 2TR22 engine
- Yanmar 3T75U engine
- Yanmar 3T80-D engine
- Yanmar 3T84 / 3T84-D engine
- Yanmar 3T72SA / 3T72SB and related engines where the same thermostart is specified
- Yanmar tractors including select YM1600, YM1601D, YM3110 and related models after engine verification
Product Overview
Older compact diesels may crank well but struggle to fire in cold weather when the intake-heater plug no longer warms or ignites the starting fuel. This thermostart-style unit restores that intake preheat function after battery, cranking speed, fuel supply, compression, and wiring are checked.
A flame plug is not the same as a conventional glow plug installed in each cylinder. Fuel feed, electrical voltage, timer or switch, intake location, threads, and serial-range design must all match.
Confirm the engine tag, tractor model, serial number, thread, electrical terminal, fuel connection, and original 124450-77910/121023-77910. Parts can vary by production date.
Key Features & Performance
- Thermostart-style intake heater and flame plug
- Electrical terminal and fuel inlet for matching systems
- Supports cold starting on older indirect-injection diesels
- Replacement for the listed Yanmar engine references
Replaces Part Numbers
- 124450-77910
- 121023-77910
- 12445077910
Common Uses
- Repairing a cold-start system that no longer heats
- Replacing a leaking or electrically open thermostart plug
- Restoring intake preheat during tractor refurbishment
Technical Specifications
- Product Type: Thermostart flame / heater plug
- Engine Brand: Yanmar
- System: Intake cold-start aid
- Condition: New aftermarket replacement
Installation & Fitment
- Disconnect the battery and close the fuel supply
- Test voltage and control timing at the original plug
- Compare thread, reach, terminal, and fuel port
- Seal only as the engine procedure specifies
- Prime the small fuel feed and test for heat and leaks safely
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application that is not shown above. Model year, production date, serial number, engine or equipment specification, installed options, and previous repairs can change fitment. Match the original part, reference number, dimensions, connectors, mounting points, and product photos before purchase.
Frequently Asked Questions
Q: Is this a normal cylinder glow plug? A: No. It is a thermostart-style intake flame/heater plug used with a small fuel supply.
Q: Will it fix every cold-start problem? A: No. Battery condition, starter speed, compression, fuel quality, injectors, timing, and wiring also matter.
Q: Why is the engine serial number important? A: Yanmar can change cold-start components within an engine or tractor model run.
Q: Is this an original-equipment part? A: No. This is a new aftermarket product. Brand names and part numbers are used only to identify compatible applications.
Part Summary
keywords: 124450-77910 Yanmar thermostart, 121023-77910 flame plug, 2TR16 3T75U cold start heater, 3T80-D 3T84 intake glow plug, Yanmar tractor hard cold start repair
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, specifications, and application before purchase.