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29th November 2020, 12:27 | #21 |
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R75 Saloon. Join Date: Feb 2009
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If you remove a glow plug and run a power supply to it you will find it becomes RED HOT. Fuel burns at a considerably lower temperature than this when producing power in the engine. The glow plug would suffer far less than the exhaust valves as burning diesel exits past them. And quite often they seem to need no help for the whole life of the engine.---
Glow plugs do very little in fact, as 99% of the time they don't do any work at all, just lie there. I have even heard fellas say that about their partners but I have no idea what they are talking about.--- |
29th November 2020, 12:52 | #22 | |
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Quote:
The exhaust valves would suffer less (in my mind) as flaming fuel going past them would happen less often (or rather it should), however, the heat would be spread more uniformly over the valve as it goes by. On an glow plug tip with a failing injector, this would likely be concentrated on a single point.
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29th November 2020, 15:34 | #23 |
This is my second home
R75 Saloon. Join Date: Feb 2009
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Glow plugs fail from the inside out.
The central heating wire burns out. The plug becomes open circuit and will no longer heat up. At this stage the outside can look perfectly sound. As the old saying goes------The truth will out.--- Exhaust valves can and do run dull red when the engine is running at high revs. Last edited by COLVERT; 29th November 2020 at 15:36.. |
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