Most inaccessible bolt

What do you think is the most inaccessible bolt on 1GR-FE?

I haven't tinkered around the drivetrain much but have taken the engine apart two times now and, so far, the worst b***h of a bolt to torque has been the lower rear (towards the driver, away from the mechanic standing in front) of the 4 bolts that hold the AC pump, assuming no drivetrain components removed out of the way. I was able to get it (the first obstacle being that you virtually have no way of seeing it from the above at all, or even when you get under but the wheel is on) but then the space to even fit the wrench is very tight, The torque is 18 ft/lbs, for which I would normally use my medium wrench that is denominated in ft/lbs and goes up to like 100 or so, but because of the tight space I went with my little one set to 206 in/lbs. I used a long 12mm socket. The short one with the shortest extension was already too long but a short one alone wouldn't reach.

So far I haven't had a more difficult bolt to reach.

 

I’m pretty sure I only have 3 bolts in my ac pump for that reason

 

LMAO. It's possible if you have the grit. It might be a job for the lady of the house (smaller hands help)

 

To access the AC compressor bolts such as when you need to change the tensioner assembly take the drivers side wheel off and wheelwell mud shield and have several long 3/8 drive extensions and a universal joint (wobbly joint) and find the way thru the suspension as there is a way - been there. Torque wrench was not used by me down there I just tighten them up. It's a pain.

 

I was able to do it without it (blind) but it wasn't by any measure easy nor pleasant for my hand (kept poking it).

I wouldn't look forward to doing it again.

 

The tools to solve most difficult access issues.

$140 Milwaukee 2457-21 3/8-in Cordless M12 Lithium-Ion Ratchet Kit (Ratchet Kit w/Tool Bag)

Electric ratchets
Or

$102 TEKTON 3/8" Drive Universal Joint Socket Set, 10-Piece (10-19 mm) | SHD91119

Tekton wobble sockets

$19 NEIKO 02486A Impact Universal Joint-Socket Swivel Set, Socket Extension Set Made From Cr-Mo with Included 1/4-, 3/8-, and 1/2" Sockets, Set of 3

Wobble joints

$15 Powerbuilt 640857 3 Piece 3/8" Dr. Wobble Extension Set, Silver

wobble extensions

$100 GearWrench 9901DBE 12 Point Flex Head Ratcheting Combination Metric Wrench/Spanner, Black, 8-19 mm, Set of 12 Piece

Ratcheting wrenches

I wrench a fair amount, my favorite tool is my electric ratchet. Before I had one, I was skeptical they were that handy. I have been converted, it's amazing.

Also strong shoutout to wobble sockets and some sort of electric drive tool like an impact driver. Super time saver there.