B engine: fuel leak between nozzle holder body and head

[M1A1cruiser]

Merry Christmas all,

03/81 BJ40. B engine. Rebuilt injectors (shop did it, not me), but not the engine. It ran when I started the "resto" (more like a salvage/resurrection of a rusted bondo-monster... but that's neither here nor there), but I didn't pay close attention to the specifics of the engine before I started tearing it apart (yes, lesson learned).

Now that it's getting back toward road-worthy, I've been running the engine more and more. A little bit of white smoke (which I understand means un-burnt fuel) quite a bit of blow-by coming out of the side cover tube (might be rings, might just be cold, might just be normal and need a catch can).

But the main problem for me at the moment, is some diesel leaking out from between the number 2 'Nozzle Holder Body' and the head.

What you're seeing there is the second from the front injector, looking from the rear of the engine toward the radiator. This is while the engine is running.
I've torqued the Nozzle Holder Body into the head at 51 ft/lb (twice).
I've replaced the Nozzle Seat (the thick, brass "washer") twice (once with the one I got from the diesel shop with the rebuild, and again with Toyota OEM)
I've replaced the Gasket (the smaller washer with the 'u' shape to it - yup, I oriented it as per FSM) also twice.

As the leak is clearly between the head and the Nozzle Holder Body, I have not torqued the Nozzle Holder Retaining Nut into the body; I suppose this may get the Nozzle deeper into the Nozzle Holder Body, and thus press down more firmly on the Gasket (again, the smaller u-shaped cross-section one) at the bottom of the housing, but I'm afraid to torque on that as I assume this was completed when the shop rebuilt the injector and if I go cranking on it, it might change a critical distance *within* the Nozzle Assembly. But I don't know.

I guess - finally getting to the point of my post/question - do I need to put thread tape around this union? There isn't such on any of the other injectors, and it doesn't call for it in the FSM. Is it possible that the nozzle is not seated far enough down into the Nozzle Body Holder to apply proper sealing against that small gasket at the bottom (if that's even the purpose of said gasket - I've also read where it's merely a bit of protection from the flame of ignition...)?

The truck idles and revs (not sure how well it pulls - yes, I don't expect much (haha!!) as I haven't had it on the road), and aside from the above mentioned issues seems to be OK. I cannot tolerate this leak as it's not insignificant. Perhaps I can ignore it long enough to get back to "road worthy" and take it to a shop for a look. But if there's a solution here on 'MUD' it'd be a happy Christmas for me!

Thanks for any guidance.
Regards,
Travis.-

 

[M1A1cruiser]

Monday bump for a question getting a few views, but I''m still looking for some input from the experts.

Clearly it's not correct that one of the injector seats is leaking fuel out (and presumably letting air in...) but I don't know what to do about it.

Thanks for considering this issue and any opinion on how to remedy it.

Best, TDC.-

 

[hiluxjeremy]

No thread tape.

My best guess is that the two main halves of the injector ie "nozzle holder retainer nut" and the "nozzle holder body" were either improperly torqued on assembly or as a distant second, the unit was assembled with less than ideal cleanliness and a chunk of something is in there.

Fact is, whoever did the work in the first place was just as human as the rest of us.

So, I would pull the injector in question for disassembly, clean/inspect and reassemble. Clean is key. Lay the pieces out in order as they come apart, paying attention to exact orientation. Compare to fsm, always a chance something wasn't together right in the first place. Watch closely for any imperfections or odd marks on machined surfaces throughout. Weird things happen all the time. Would recommend a new nozzle gasket (the smallest one closest to combustion chamber). But I have reused them in a pinch...not ideal.

On the bright side, it's a Landcruiser, not a spaceship. Can't be that broken.

 

[DEADSALT]

Above,

tourque the nozzle holder nut to the nozzle body 51 ft/lbs
then
torque the nozzle body to head 74 ft/lbs (check my memory)

and be sure that the previous copper gasket is not underneath the new copper gasket.
They can get pretty coked up, blend right in, hard to see and hard to get out.

Once you get the injectors seated and bled,
there a few little things here and there to make the B happy again.