Original oil pressure hose, crossing the whole firewall
only to realize that there's no point in running a hose all the way to the other side, only to also run the sensor wire all the way there - so I removed that, and instead got a shorter hose to attach the sensor close by with the Show Planes clamp:
New oil pressure hose, connected to the sensor nearby
We tried to install the breather tube, it then realized the ANL fuse holders should have been maybe an inch higher up on the firewall to not interfere with it, plus the rubber tube clamp would've ended up right against the engine mount, so we instead got a longer (MIL-6000D) hose and trimmed/re-beaded the tube so they connect just above the top Adel clamp.
Breather tube installed in place
Breather hose connected to breather tube, immediately above an engine mount bar
Trimmed and beaded breather tube, along with the hose that will connect to it
Breather hose and tube installed in place
The main downside of this is that it counts on the Adel clamps not allowing that tube to rotate (which was previous assured by the top bend of the tube being connected to the hose), but I guess that's easy enough to inspect, plus the bottom of the tube is not low enough that it could turn backwards (which would create negative pressure and suck a ton of oil out in flight).
I also added a whistle hole, as described in various VAF posts and a Cessna AD:
Whistle hole, to relieve oil pressure if the breather gets iced up
With most of the near-firewall work done, I test-fit the oil cooler (without fully securing bolts or fittings), and realized that the hose lengths I have won't work too well:
Test fitting the oil cooler and hoses, iwth the hoses being too long
Too-long oil hose hitting the heat control cables
I replaced the hose to the outboard fitting with a shorter one, and we reclocked the engine fitting for the inboard one to give it clearance.
The bottom outboard bolt hole on the cooler was also impossible to use with a long bolt - it's just too close to the engine mount - so I trimmed that off as well:
Oil cooler, with two flanges trimmed to clear the engine mount
I also realized that the AN3-40A bolts that came with the oil cooler installation kit may be a tad too long for the bottom holes, as they were hitting the firewall - so they'll be replaced with -37As (for some reason there's no -39A or -38A? but 37A was the right length with one less washer):
Oil cooler bolts hitting the firewall (before even being fully tightened)
With that, we installed the cooler in place, and sealed the sides and corners with Permatex 27038:
Oil cooler installed and sealed in place
Last, we secured the hoses to the engine, engine mount and oil cooler:
Oil cooler with hoses connecting it to the engine
With this, the prescribed part of section FF5 is complete! Later we'll install the oil drain kit.
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