"I tested them, some 90 Ohms, some not even making a connection. only 1 plug is doing 1 ohm. "
I'm gonna stick my neck out here and say that I've probably dealt with a exponential factor more glow plugs than you and have NEVER seen one Ohm out at 90 Ohms.
Almost without exception there are either "open" or "good".
A GREAT way to check them is with an Ammeter that can be connected in series with each individual GP or a clamp-on Ammeter that will read DC Amps.
When powered, prechamber GP's typically draw between 8 and 20 Amps.
When checked in that manner, the good ones will read similar Amps for a given system, and the open ones will read ZERO Amps.
As far as removing them, sticking in the threads is typically not an issue, it's the ones that expand/blow open at the tip as they fail and would rather break off in the prechamber that you have to worry about.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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