I could use some help from the brain trust. New Member. 2014 JK Wrangler Sport, Manual Transmission, 123k miles. Short story (if you want long story see below) after replacing head gaskets, oil cooler, heater core, new spark plugs, new PCV, jeep won't start. Starter sounded like it was freewheeling, replaced starter... still won't start. After I got it all back together on first start attempt engine coughed for a second or two and now nothing since. Tried jumping battery...no difference. Looked over fuses and relays in TIPM...doesn't look like anything is blown. I can rotate harmonic balancer by hand with socket so it doesn't feel like engine seized. Engine was running before I took everything apart. Engine was apart in garage for 4 months (life and work got in the way of maintenance). When I got everything back together there is one ground coming off negative battery terminal wire bundle that I could not find original location for. See picture below. I've tried grounding to firewall and engine block but neither makes a difference. Tried hours of searching for OE ground locations found this thread https://www.jk-forum.com/forums/stoc...cations-355618 and I think it's either G101 or G104.

Long story, loaned jeep to 17 year old son for daily driver. Jeep had small oil leak from oil cooler, no big deal check oil once a week add half quart every month or so got new cooler waited on good chance to install. Showed son how to check oil, how to fill, how to change oil basic car maintenance stuff that anyone should know. One day son called from down the road that jeep was "overheating and leaking brown fluid from under engine". I told son to shut down and wait for me. When we got jeep towed back to house looked like chocolate milkshake leaking from engine. Turns out son put 3 more quarts of oil in without even checking dipstick. So I slapped my forehead and started my teardown / rebuild project. Drained oil and thankfully it was clean (no water / coolant in oil). However there was aerated / foamed oil mixed with coolant in EVERY part of the coolant system, radiator, heater core, engine block, oil cooler, etc. I can post pictures if anyone is interested, it was ugly. Don't let your teenagers over service oil in your car. Head gaskets were intact so my theory is that the extra oil got churned up by crankshaft and over pressurized oil system, blew past already leaking oil cooler and forced it's way in to coolant system / block / etc.

 

You wrote that the starter sounded like it was freewheeling, did someone verify the crankshaft was not turning with the starter motor energized?

Edit: Side note, I can't think of a way that aerated oil will raise oil pressure.

 

So after a lot of investigation today. The starter spins everything it’s supposed to (movement all the way up to the serpentine belt / crankshaft)

When I pulled the valve covers and chain case cover off again, the timing chains on left and right cylinder head camshafts had both jumped exactly 3 teeth on the camshaft.

So I removed both camshafts, phasers, reset left and right head chains, triple checked all my reference marks (from first disassembly at top dead center after jeep was running) and reinstalled everything (with the Chrysler engine build reference docs. This time) put everything back together and still have the same issue. Probably going to throw in the towel and let a good independent mechanic take a look. Guess this was probably over my head this time.