Loud ticking/tapping/knocking from 1.6 IDI 81 jetta

[Krisverde]

Cool thanks for the tips. Yea you said cone side down on the seal washers right? Also I don't know if I have a bad nozzle yet. Ill get to it this week hopefully. Ill keep yall updated.

[ORCoaster]

Yep, cone side down, and I second the dab of anti-sieze and 55 lbs torque.  Never know when they might go gunny again.  I love the push to remove, push to tighten line.  No pulling allowed on that head. 

[mtrans]

I have another IP for 5 yr so change it just to see,before I have 4 plate on advanse piston so I remowe 2 biger and now I have big noise on Disel,but very good sound on oil fuel after heat engine.Good thing I didn`t shave piston too.

[theman53]

Try searching for heat sheild pics. There are 2 sides to a cone so saying cone side down doesn't really get it for me. Concave side down might be better, but as long as you know the little hole is supposed to seal around the needle of the injector to be correct you should be OK.

[Krisverde]

Alright so diesel place said my injectors weren't good... But they aren't the issue to what I am having.  So ill be doing a compression test. what are the specs I should see?

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[libbydiesel]

If you look at a heat shield there it is an intersection of TWO cones.  The center cone should point UP, the outer cone should point DOWN.  To say just that they should go "cone down" is intrinsically misleading. 



Here's a cutaway.  Red is the heat shield, blue is the injector and black is the head and cut lines.

[Krisverde]

Alright I moved injectors around and it's still running rough and the issue seems to be from#1 cylinder still. So ill check the valves and do a compression test.  I have a bentley sitting around for a mkII diesel I imagine its the same stuff?

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[ORCoaster]

Might you have a loose piston at the crank? 

Libby is back with the AutoCad.  The forum is now complete again.

The Man53  how about washer looking up for orientation purposes.  Rather than cone up, cone down.  Or Washer like face to injector face.  Is that less confusing?

[Krisverde]

I just need to check the valves. It had a moment where it idled real smooth then started clacking real loud. Revved it up and missed then cleared up but still clacked real loud. I've only seen white smoke when it started missing.

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[Krisverde]

Oh and yall can call me stupid for this but I sprayed carb cleaner around the injectors while she was running. Once the fluid hit the spot where the nozzle threads onto the main injector the idle went up and I saw bubbling.

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[R.O.R-2.0]

Oh and yall can call me stupid for this but I sprayed carb cleaner around the injectors while she was running. Once the fluid hit the spot where the nozzle threads onto the main injector the idle went up and I saw bubbling.

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just as long as you didnt spray it in the intake, its fine..

and of course it will bubble, the engine was HOT..

whats the MAIN injector?

i didnt know there were primary and secondary injectors?

[ORCoaster]

I know you don't want to think this hard R.O.R. but how many times does the fuel get compressed between the intake of the IP and the output of the injector bodies. 

Does the vane pump compress then inject to the secondary then in the internal pump in the head then again at the injector?  Does the injector count at all because it only recieves a compressed stream of fluid and reacts to it?  I think the name is misleading, true it allows the fuel to enter the cylinder but does it actually inject it? 

I know nit pick, nit pick.

I think for bubbling at the threads most any liquid would do.  Water, WD40, brake clean if you are fast enough to see it, watch the flash point there.  The use of carb cleaner was more accidental than anything else. 

MY 2 pennies

[745 turbogreasel]

I'm envisioning the threads between the injector body and the nozzle holder.

If the intake inhaled even a whiff of carb cleaner, there will be a bump in RPM.

When i suspect a leak, I dry the injectors with brake clean, and watch for the reappearance of liquid.

[Krisverde]

Yes that's right. I just know the bentley shows upper and lower body of the injector. Anyways I sprayed around the area again and made sure to stay away from intake... No change in idle speed.

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[R.O.R-2.0]

Yes that's right. I just know the bentley shows upper and lower body of the injector. Anyways I sprayed around the area again and made sure to stay away from intake... No change in idle speed.

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so, it was just getting a WHIFF of vaporized carb cleaner to the intake air.. that would definitely account for a rise in idle speed..

being that the injector, and pre-chamber are both under VERY HIGH pressure, i didnt see how the engine could actually ingest enough carb cleaner thru the injector threads to actually change anything..