|Availability:||In stock (20)|
For use with 24V electrical systems with Super Glow only.
Glow plugs should be replaced as set, and not individually.
If you want to replace the stock Super Glow system with a Manual push-button, you should run 20.5V glow plug instead of these to prevent rapid burn out in 24V systems.
Toyota: 19850-68060 - no longer available from Toyota
Denso: 067100-1460 - no longer available from Denso
NGK - no longer available from NGK (the present stock is the last of this part number from NGK I can obtain. I am seeking out other part numbers to replace these when they run out - December 2022)
NGK - Japan
New stock will all be HKT - Japan starting in early 2023
What does "Super Glow" mean:
The Super Glow system is an early automated glow timing system, nowadays it's the expected norm, but in days of old the term separated the manual push button systems from the more automated systems. Modern automated glow systems are more complex than what I'm describing below and use more inputs and usually monitor the performance of each glow plug. Modern glow plug designs are also much more complex than early glow plugs, and have special features to greatly improve heating time and reducing emissions.
The Super Glow system uses a glow timer (ECU) that has inputs for engine and sometimes ambient temperature, monitors system resistance (often to check if all the plugs are working), and uses a current sensor (shunt) to measure how rapidly the glow plugs will reach full temperature. The glow timer then uses a pre-prgrammed curve based on the inputs for primary glow and post glow for how long the glow plugs will stay powered-up in each stage.
The primary glow cycle uses greater current to get the glow plugs up to full temperature quickly - and why the glow plug voltage is less than the vehicle voltage (ie: 14V glow plugs for a 24V vehicle). The post-glow feature does a few things; one is to ensure smoother running after engine start-up and reduce misfires, and it's also there to dramatically reduce emissions and visible smoke from the incomplete combustion of diesel in a cold engine during early engine warm-up.
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