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Twicky Glow Plugs, Pics
For about 2 weeks now whey you first turn the Key to the pre-glow position the Glow Plug Light would not go on at first. If I cycled that Key of and back on the Glow Plug Light would come on normally.
I disconnected the Glow Plug Wire Harness at the Glow Plug Relay and used the Ohm Meter to check them. But, they all Ohmed out OK.
Today I decided to remove the Plugs to test them on a Battery and also to ream the Carbon out of the Glow Plug Holes.
The Car is seldom driven on the Freeway and mainly operates within a 10 mile radius of my Home so it is mostly a City car.
The Glow Plugs in the car are Monarks; which are not supposed to be very good and they have were in the Engine for about 2 years. I use the Glow Plugs as often as I can remember to do so even though here in S CA it is not cold.
Connecting the Glow Plugs to the Battery one by one I found that all but one Glow Plug glowed well at the very tip of the Glow Plug. First pic. (And an other one died during the test.)
On that one the complete tip glowed but as you see in the pic it glows at a lower temp. About a month ago on another Forum ForcedInduction described this as a bad Glow Plug.
Oddly during the testing another Glow Plug that had been working died during the test and when I Ohmed it and found it had an open circuit.
I have a bunch of Bosch Glow Plugs so I tested them on the Battery also; all the Bosch Plugs glowed at the tip as they were supposed to and I installed them in the Engine.
The other 2 pics are showing the amount of carbon I got out of 2 of the holes when I reamed them.
In the last pic you can see that the very end of the Tip of the Glow Plug is the part that is going to heat the Pre-Chamber. If the main body of the Glow plug Tip gets hot the Heat goes into the Cylinder Head instead of heating the Pre-Chamber.
Added:I forgot to mention that one of the reasons I was checking the Glow Plugs so completely was because I needed to know if it was the Ignition Switch that was causing the problem with the Glow Plug Light or the Glow Plugs.
With the new Glow Plugs the light is functioning normally.
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84 300D, 82 Volvo 244Gl Diesel
Last edited by Diesel911; 05-21-2010 at 01:34 AM.
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