OM606 glowplug tungsten blew out while running and all tips melted.
OM606 glowplug tungsten blew out while running and all tips melted.
Today while revving i heard an explosion from the engine bay and a compression leak started. I pulled into my garage and removed manifold and plugs. All tips are heavily deformed and have heat colouring on plug frames + 2 tungsten tips were missing.
Could this be caused by the nonprogrammed EDC pump causing car to roll coal like a steam train and having massive egts,? This is not an overstatement either and the car is embarassing to drive due to the smoke. I have ordered parts to program ecu so I will sort this out.
Then i'm also using pump timing 10° atdc without any custom offset to the pump. Could this cause issues like this?
My glowplugs are cheap kamoka plugs but i would bet that they would last normally in a stock car.
I don't want to buy bosch because they are way more expensive and if this happens again it's a waste of money.
Any help is very appreciated
I swapped 7.7mm elements a while ago and replaced glowplugs.
Today while revving i heard an explosion from the engine bay and a compression leak started. I pulled into my garage and removed manifold and plugs. All tips are heavily deformed and have heat colouring on plug frames + 2 tungsten tips were missing.
Could this be caused by the nonprogrammed EDC pump causing car to roll coal like a steam train and having massive egts,? This is not an overstatement either and the car is embarassing to drive due to the smoke. I have ordered parts to program ecu so I will sort this out.
Then i'm also using pump timing 10° atdc without any custom offset to the pump. Could this cause issues like this?
My glowplugs are cheap kamoka plugs but i would bet that they would last normally in a stock car.
I don't want to buy bosch because they are way more expensive and if this happens again it's a waste of money.
Any help is very appreciated
(02-27-2025, 11:10 AM)Niko Were they on when that happened ? If they were glowing and flooded with fuel, sounds like a possible cause . You might want to check the relay is functioning right . Also I'd drip test the pump to see the SOI (around 16-20 BTDC by memory ).
The plugs were off when it happened. Checking the relay is probably a good idea too. I haven't drip timed the pump but the element seller says 10 atdc when installing the pump with locking tool with these elements. I had it at 13° but it sounded quite mild. At 10° it nails a little bit. I also got 150 bar injector pop pressure so it might retard it a degree or so? I would post a picture of the glowplugs but it wont let me.
I inspected them and it looks like the tungsten is threaded into the glowplug frame and this thread wont handle the cylinder pressures and the tungstens starts coming out of the frames. Almost all plugs are like that. I wonder if the tips melted because the tungstens had been pushed out a bit and didn't absorb combustion heat from the glowplug tip anymore and causing it to burn through it at long WOT. I'm thinking that the kamoka plugs are built too weak because 1 plug is not deformed at all and it's the only one where the tungsten is still completely seated.
(02-27-2025, 11:10 AM)Niko Were they on when that happened ? If they were glowing and flooded with fuel, sounds like a possible cause . You might want to check the relay is functioning right . Also I'd drip test the pump to see the SOI (around 16-20 BTDC by memory ).
The plugs were off when it happened. Checking the relay is probably a good idea too. I haven't drip timed the pump but the element seller says 10 atdc when installing the pump with locking tool with these elements. I had it at 13° but it sounded quite mild. At 10° it nails a little bit. I also got 150 bar injector pop pressure so it might retard it a degree or so? I would post a picture of the glowplugs but it wont let me.
I inspected them and it looks like the tungsten is threaded into the glowplug frame and this thread wont handle the cylinder pressures and the tungstens starts coming out of the frames. Almost all plugs are like that. I wonder if the tips melted because the tungstens had been pushed out a bit and didn't absorb combustion heat from the glowplug tip anymore and causing it to burn through it at long WOT. I'm thinking that the kamoka plugs are built too weak because 1 plug is not deformed at all and it's the only one where the tungsten is still completely seated.
Try posting an image on some hosting site.
When you were mounting them did they fit really snug ? The BERU ones I installed in my daily needed a good tap once the heating tip started to go in the head . The tip also seemed to be rolled and not threaded. If I dig around I'll find an old bosch plug and section it .
Try posting an image on some hosting site.
The glowplugs fit good. I had the prechambers off and used ultrasonic cleaner on them and they had 0 soot after that on them. Also I had 3 plugs break in the head and had to drill them out so I chased all the threads with a tap so the plugs went in easily and I also torqued 20nm + 2nm.
I theorized that the cheap plugs cannot handle the low injection duration off the 7.7mm elements paired with advanced timing because it probably generates a very large combustion chamber pressure peak. I am going to order bosch plugs and retard timing a degree or two. I expect these to last.
https://imgur.com/a/Hd2X4xG
Ok, here are pictures of the worst glowplug, all had the tungstens coming out and would have had the same thing happen soon.
The glowplugs fit good. I had the prechambers off and used ultrasonic cleaner on them and they had 0 soot after that on them. Also I had 3 plugs break in the head and had to drill them out so I chased all the threads with a tap so the plugs went in easily and I also torqued 20nm + 2nm.
I theorized that the cheap plugs cannot handle the low injection duration off the 7.7mm elements paired with advanced timing because it probably generates a very large combustion chamber pressure peak. I am going to order bosch plugs and retard timing a degree or two. I expect these to last.
https://imgur.com/a/Hd2X4xG
I'm thinking the advanced timing is the issue when paired with cheap plugs
The engine sounded completely normal, at 13° it was very similar to 6mm elements but when I advanced it to 10° it nailed a bit at idle. I have 1 om617 too that I run at advanced timing and have had 0 issues with it but that only has 6mm elements.
I'm thinking the advanced timing is the issue when paired with cheap plugs
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