When I redid my TB I test ran it to make sure the tensioner was correct per some of the threads but I don't recall any cautions about over heating. It only ran for a few seconds but still, you have me worried now!

Thanks for the videos Sir Sam, they will help with my head R&R. At least now I have an idea of what things look like and are, plus the tips.

Did either of those junkyard KJs have the owners manual in them by chance?

Thanks,

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2005 Liberty CRD, with 135,XXX miles. Rockers, exhaust valves, Provent, EGR block & butterfly delete & V6 air box at 100K

1998 XJ 4.0L, stock with 130,XXX miles

First Jeep: 1962 Willys CJ-3B

I think a short while, up to 30-60 seconds on a dead cold engine, is fine.

I would not run it an extended amount of time though.

_________________
http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

You are correct to a point. if the block is cold, a few revolutions should not hurt but this can be done by hand without firing the rig anyways. Being a heavy equipment mechanic and operator, one thing I learned a long time ago on starting a sub zero diesel engine is to turn it over for 20-30 seconds then let it sit for a few minutes. The diesel will continue to burn and heat up the cylinders while you wait. Works every time. As for doing this when the ambient temps are warm and there is no coolant, you are very correct in not taking the chance!

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GDE FT Ecotune, EHM, Weeks kit stage 1 & 2, Carter 4600 lift pump, Upgraded tranny, Fishing boat hauler!
New at 164K: head gasket, rockers, exhaust valves, ARP head studs, Injectors, 5v Bosch glow plugs, water pump, timing everything, serpentine everything,
New at 225k: new head, timing belt

Minor update for the junkyard engine. Turns out it was really good timing, in December my dads CRD dropped a valve, luckily I had this low mileage engine to drop in.

It still took a bunch of time to get everything swapped over, but its running and back in CA with him.

Video of the valve carnage:
https://www.youtube.com/watch?v=lW8i7nKSsX8

_________________
http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic