Triple-locked LX470 blew plug out of cylinder 7 at 270k. New engine advice? (8 Viewers)

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Def some build up here

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Update! Mechanic has agreed to put in new valve seals for me on the offending head. He reached out to the head remanufacturer and they won’t do anything because 12mo warranty expired. Really pleased that he's backing up his shops work. I ended up pulling the injectors to get some photos of the valve stems, pretty cool what you can see with the bore scope.

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Also manually rotated the crankshaft to reposition valves so I could see on backside of exhaust valve stems.

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Since injectors were out, I sent them to Chuck @ FIS in Co. Out of 8 new injectors put in with the new heads last year, Chuck only approved of the spray pattern on 5 of them. Ordered another 6 used on ebay and only 3 of those were good ... so I now have 8.

Addressed some comments above regarding my power steering as well. Its flushed now fully properly ... ok I put in a new pump too and an inline filter.

And new fuel pressure regulator / pulsation damper.

Off to mechanic in a week to get new seals!

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What borescope are you using? Great pics.
 
What borescope are you using? Great pics.
This is what gave the good photos:
Two-Way Articulating Borescope... https://www.amazon.com/dp/B0CJY5C9QX?ref=ppx_pop_mob_ap_share

The articulation joystick just broke on it. It’s plastic and takes a decent amount of force to drive the head. I’m going to try fixing it. It also doesn’t have a good 45deg mirror attachment. I bought a different $30 borescope and taped its mirror to the end of the good one. $30 unit doesn’t deliver nearly as usable images.

That said, image quality is really good and it does video. Very impressive for $130.
 
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