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Old 04-18-2018, 05:19 PM   #11
Nautamaran
 
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Default Re: Black Death Returns

(I continue to be impressed with Dennis’ business sensibilities)
I agree that freehand cutting is best avoided... too much potential for tool chatter making things worse, and hand lapping with a flat abrasive works better and with less risk. That said, the thread Vic pointed to shows the factory sealing surface having a texture stamped into the surface of the aluminum, which in hindsight is also what I encountered during my repair but simply sanded flat (following advice here and my past experience working on Lister and Detroit Diesel engines). In the absence of visible erosion tracks I’m inclined in future to just use chemical cleaners, inspect for tracks, then leave the textured surface intact. But I did find erosion on the injector’s end surface (and the top of copper) which I had to sand out, and 12 months/20,000 miles later there is no sign of new leaks.

-dave
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Old 04-18-2018, 07:20 PM   #12
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Default Re: Black Death Returns

Quote:
That said, the thread Vic pointed to shows the factory sealing surface having a texture stamped into the surface of the aluminum
That looks like a repair job of a used surface, not new. Can anyone confirm what a new cylinder head sealing surface looks like? I'd be very surprised if it's not machined flat.
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Old 04-18-2018, 08:20 PM   #13
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Default Re: Black Death Returns

By reading all this...

I was about to order a set of seals and hold-down bolts to do a preventive maintenance in the near future, but now I doubt I will do it. My van has 341K kms, injectors were never touched. No black death sign. All clean and dry under the injector cover.

I guess my best bet is to wait and see... and checking regularly for changes under the cover. Aside from having black gunk, is there any other test that I should do to check for emerging injector leaks? I have a very slight ticking when hot at 1000-1200 rpm, and it points towards an injector noise, but is an injector ticking sign of black death?

Sorry if i'm confusing....
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Old 04-18-2018, 09:17 PM   #14
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Default Re: Black Death Returns

Quote:
Originally Posted by markxengineering View Post
That looks like a repair job of a used surface, not new. Can anyone confirm what a new cylinder head sealing surface looks like? I'd be very surprised if it's not machined flat.
A clear closeup picture of a new head seal surface would be great to have.

I studied the pictures quite closely before posting my opinion. The patterns don't have linked continuous crevices or flow patterns. To me the patterns shown don't look like they could be created by corrosion paths or any repair re-surfacing, but I cold be wrong.

vic
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Old 04-18-2018, 09:19 PM   #15
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Default Re: Black Death Returns

Here are my 5 injectors.







Anyone seeing something that I should worry about?

Thanks!

Vince
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Old 04-18-2018, 10:39 PM   #16
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Default Re: Black Death Returns

Quote:
Originally Posted by VinceP View Post
...

Anyone seeing something that I should worry about?

Thanks!

Vince
You should worry that jealous members will stop answering your posts. That looks great to me.

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Old 04-18-2018, 10:52 PM   #17
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Default Re: Black Death Returns

Hahahaha, Sorry Vic. That wasn't my goal... I am really Newbie on these injectors issues. So I don't really know what is good or not....
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Old 04-18-2018, 10:57 PM   #18
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Default Re: Black Death Returns

Looks great to me too! (but I’ll keep answering your questions ;-)

I recall reading a comment on the source of the brown dust in the “Remove/replace injector” write-up thread, but can’t recall if it was a concern or benign? I *think it collected from the hair pin clips holding down the return fittings?

The ticking may be from aging injectors, but could be from the valve train or exhaust manifold too? An injector leak-off test is one of many diagnostic tests available, indicating a worn injector valve, but there are many failure modes that a technician with real tools can diagnose for you without disturbing that pristine gallery...

-dave
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Old 04-18-2018, 11:15 PM   #19
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Default Re: Black Death Returns

I will add that once I encountered a cracked injector. The body itself was cracked and making the "fftt fftt fftt" sound. I thought for sure it was black death but when I removed the injector and inspected the seal and seat, I found no signs of leakage. So I put in a new seal and bolt and re used the old injector. Immediately upon startup it made the same chuffing sound and I was stumped. So I replaced the injector and the noise was gone.
Strange but true.
*I should add that I never found an obvious crack in the injector, but it clearly was a problem with the injector, not the seal.
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Old 04-18-2018, 11:31 PM   #20
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Default Re: Black Death Returns

Quote:
Originally Posted by Nautamaran View Post
...
I recall reading a comment on the source of the brown dust in the “Remove/replace injector” write-up thread, but can’t recall if it was a concern or benign? I *think it collected from the hair pin clips holding down the return fittings?

...

-dave
Benign. The ss return fitting clips fret against the steel injector body. Vibration from the injector triggering. The fine iron dust rusts from the moisture which causes the localized brown or rust color.

Even with the heat of the engine the environment under the black cover isn't as dry as might be expected.

vic
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