Quote:
Originally Posted by Hendo
Is that backwards? Or am I just reading it wrong?
The heat shield is copper, so the magnet would *not* stick to it.
No heat shield means the magnet *would* stick to the steel head.
Right?
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Wrong. Heat shield is malleable steel, head is aluminum.
The injector heat shields serve at least 3 important functions:
1. Seals injector to head (combustion chamber) so gasses cannot escape between injector and head (threads).
2. Transfers heat from injector nozzle to head, where circulating coolant can remove the excess heat.
3. Protect aluminum head from sharp nozzle edge.
Leaking, or missing heat shield could cause the excessive carbon buildup on the injector body, and on the threads, making removal difficult.
This photo shows a new heat shield, upside down from the orientation it would be installed into the injector boss in the head. They are the same width or slightly larger, as the width of the injector nozzle.
Heat Shield.jpg
As Anders stated, it is designed to crush (deform), to make the seal, and is a one-use item. Some have managed to reverse the deformation with a 1/2" ball bearing and vise/socket combination and gotten a few more uses out of them.