My engine seems to have "seized" after a thorough brake job in my garage at home.
The job took exceedingly long due to some complications with the work, but mostly, in a time soak due to a forearm injury in an outside, unrelated accident in the midst of the job, and that waylaid things.
The 2010 Mazda 3i touring, manual trans, was running super fine at 158,900 miles. Synthetic oil level was and still is up to par.


I did a very thorough brake job starting in mid July. The brake job required cutting into the steel brake line a bit, for new Dorman flexible brake hoses, and then double-flaring and bending back into place. So the car sat much longer than I’d have liked with all this hullabaloo.

Finishing up the final flaring and wheel early last week, the symptoms to start were no start, very marginal short attempt at crank of the starter motor and a dry nashy metallic sound from the starter.

For sure the garage interior got humid, dank, lack of circulation as we had a lot of rain in Aug and Sept. But wow, Mazdas are they ever susceptible to rusting to **** all over the place. Thought the engine would have gotten a pass on this.

I tried rotating the crankshaft yesterday. And the car’s in neutral up on 4 jack stands, after said full brake job. Today I confirmed it rotates in the counterclockwise direction, and there's a "squeegee like wiping sound" coming from within the block it seems. But I cannot get any rotation in the service-manual advised, appropriate clockwise direction.

I've soaked the cylinders since yesterday morning in about 100ml/each of Marvel Mystery Oil,. Yesterday afternoon I added several shots of PB Blaster in the mix- down each cylinder head hole. I sucked all that out of each cylinder today with a Mityvac hand pump.
Now. more thinking, talking and troubleshooting today, it occurred to me that I may have a completely seized accessory- particularly the original AC compressor.
I've ordered 2 new serpentine belts to replace and a stretch belt tool.

I have a couple of questions.
1) What chances do you think a frozen accessory on the serpentine belt with the crank pulley could cause all this headache?
2) Has anyone seen such starting problems and "frozen/seized motor" from just sitting for a few months with this kind of age and mileage? And assuming the car was well maintained, cared for, and wasn't fed a reason to seize(no oil starvation)?
3) What happens if I continue to rotate the crank in the counterclockwise direction during my troubleshooting? I'm being very cautious as clockwise was stipulated.

I can take the valve cover off and inspect valve clearances and look for anomalies in "bent valves" or other such things preventing a clockwise rotation of the crank, but I'd rather not yet.
I'm hoping that the AC compressor just decided to seize, and that I can take it out(cut the belt) and get the car started.

Thanks!