Glow plugs leaking

[pathfndr]

Some of y'all were helpful enough to offer me some advice on rebuilding my m25xp. Last night I fired it up for the first time. Success! It ran....I celebrated....it was great. Then today I inspected the engine and saw a bunch of black "stuff" near all three glow plugs. I assume its diesel from the combustion chamber. The plugs are in there pretty snug. I googled and searched the forums but don't see anything obvious. I'm brand new to diesel so there's no doubt I could have made a newb mistake. With a sparkplug, there is a gasket that seals down on top of the hole. With these plugs, they just thread in and the threads do the sealing? What am I missing? I'll disassemble the intake manifold and hit them with the torque wrench, I just wanted to see if I was missing a gasket or something first. Since its all three, seems like user error to me.

 

[RitSim]

As I remember it, the glow plug has only a taper at the end that seats against the head. I think you either have debris in the holes or seat damage. The problem you have is that any cleaning/grinding allows that material down into the engine where it may live forever- doing damage.

 

[RitSim]

Did a quick Google search and there are other possibilities "leaking glow plugs". Could also be cracked glow plug ceramic, spray from the injectors pooling in the glow plug hole.

 

[pathfndr]

So apparently there is about an 1/8 of a turn difference between "snug" and 18 ft/lb. I torqued it to the proper spec, hit it with some brake cleaner, ran it through 2 buckets of water, and no more leak. Thanks!