He may have 'tapped' his bellhousing and messed up the crank sensor reluctor ring on the flywheel.
Check oil pressure with an oil pump pressure gauge hooked up to where the oil pump gauge sender is screwed into the block.
He ran that eengine at a high back angle for some minutes. Maybee the engine did not 'like' that too much.
DID you crawl under this Jeep to look for physical damage?
Chicks dig me.....Fish fear me
Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.
"If we cannot afford to take care of Veterans, then we should stop making them."
David C. Wilker Jr. USAF (RET)