Glow plugs in diesel cars help cold engines heat the air and fuel mix up to ignition temperatures. This becomes more important during winter due to the freezing cold temperatures.
An engine in good condition will ignite without any help from the glow plug when the temperature outside is around -5 °C or higher — I've checked this myself. But when it drops to -8° C or below, things change: the engine gets much harder to ignite, and draining the battery sooner becomes more likely.
Glow plugs are perishable goods, since their lifespan is much shorter than that of an engine. I used to replace them every 25 — 30 thousand kilometers, which always happened by the beginning of the winter.
By then you could feel that the engine needed the glow plugs in good condition. Feel that when the starter began to spin, only one cylinder was igniting. Then, after a few more spins, the other cylinder would start ignite and the engine finally started.
A glow plug has an elongated shape. On one side is the heat inductor, on the other — a power outlet. The negative terminal is located on a section of the plug that is bolted to the engine in a way that places the plug's head next to the nozzle.Before removing the plug check the fuse. I have 3 glow plugs that operate at 80 amperes fuse next to the positive terminal of the battery. My fuse once blew out due to a short-circuit in one plug.
If you have to replace the fuse, don't pull on it before you unscrew it.
This is what a new fuse looks like:
The easiest way to replace the plugs is to remove the plugs from cylinder head removed from the cylinder block. It's not complicated: just unscrew the plugs and you're done. We'll be studying a much more interesting case though — without the engine disassembling.
First, unplug the injectors and plug of the position sensor of the camshaft. Then, unscrew the cable fasteners and put them aside.
Finally, unscrew the device that separates the gases from the oil in the sump which is held by two screws.
If the exhaust pipe becomes a burden, you can remove it too: it's held by four screws — two on each side. It's very easy to remove, although I usually didn't bother with it.
Disconnection of the Glow Plug's Power Supply
Unscrew the plug's power supply strip held by the 10mm nuts. The plugs are located on a side of the engine from which they can't be seen and can only be reached using yourhands or wrenches. And a camera.