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Manifold vacuum should be in the neighborhood of 20 (inches of mercury) ideally...the hiss from the brake booster is probably a bad diaphragm. Maybe disconnect the brake booster and plug it's vacuum source and re-check.
An oilpressure of 5 (PSI) is a little worrisome, but if the engine is hot may almost be normal. Oil generally just drips from the rockers... Wonder if maybe you could adjust that oilpressure relief valve and bump up the pressure a little? Make sure you didn't plumb it backwards too.
I realize you're an air-cooled guy, radiators traditionally overflow as the water heats up. Most Pigs did not come with an overflow bottle. Most owners buy a generic overflow bottle and fit it in near the radiator cap...
, but it was a VERY slow drip.
I forgot, you have the early oiling...your oil does not get to the head through the cam bearing, it gets up there through the little brass tube and banjo fitting around the rocker shaft. A few drops is all I'd expect, especially with your low oil pressure.
If the hiss is truly a bad master diaphragm it will certainly lower your vacuum readings. Your altitude will also lower it. valve adjustment will probably improve it, your timing will also affect vacuum. I use my vacuum to help with timing. Advance the dizzy to find best idle vacuum, then retard just a hair and try it there. Carry a 10mm endwrench in the glovebox so you can retard it more if it pings.
Brake booster: After some searching and reading, I think the hissing means replacement or rebuild. I have not been able to locate a rebuild kit - although I only looked at a few online places and one may be available somewhere.
Battery hold-down: I need to add some straps or fab some spacers as the battery I have is too short and the stock hold down studs aren't threaded deep enough to allow the stock hold down to snug it up.
Muffler heat shield: I noticed on my short drives around the block that the driver's side floorboard above the muffler/exhaust heats up - a lot. A friend had mentioned this happens on his FJ55. Is there a common set-up to help w/this? I don't want to melt the sole of my shoes!
Parking brake: I need to source all the e-brake guts and figure out a cable length that'll work etc...
roof: I need to pop the roof back out/up. Also the 2 main roof supports are sagging. Is it common to add some sort of reinforcements to these supports or the roof in general to help it keep its shape?
Headliner: I don't think I want to endure reinstalling a stock headliner right now, but I do want to put something up there. I was thinking about some heavy felt or perlon carpet. I've seen it done on vintage race cars and I think it looks good. . . see pics below.
Headlights: This could fall under the general electrical note below, but adding a relay set-up for brighter headlights is on my list.
Dash cap & instrument panel cover: I see that SOR offers a plastic dash cap for 9/72-later FJ55's. Will this fit my 4/72? My dash is intact, but has about 6 cracks and is a bit nasty looking. Alternatively, I could use some carpet I suppose. w/the instrument cover - SOR offers a replacement piece - is that a good option?
Rear interior panels: I need to fab some rear interior panels - the pieces that cover the emissions tanks in the rear. Mine were not-so-nice. I have the originals to use as templates and was thinking about aluminum or stainless sheet - maybe covered in carpet to help w/the tin can feel and noise.
Wipers: turn on and work fine, but the arms are broken and have no blades. I did some searching and am not exactly clear on the path to having an arm that accepts non-specialized blades. Is there one? I'd like to end up w/an all-season wiper that's easy to find replacements for.
Trailer hitch: need to fab one to fit the existing holes on the rear bumper - just for our yard trailer, nothing big. Also need to wire for trailer lights - is there something to this w/an FJ55? I must admit that I've been spending A LOT of time w/the wiring diagrams and don't really understand the tail light wiring at all yet.
Weatherstripping: I spent a long time reading through this thread yesterday: https://forum.ih8mud.com/fj55-iron-pig-preservation-society/90960-fj55-weatherstrip-guide-30.html In order to uphold some sense of budget, it looks like I will have to mix and match pieces from a few different sources - JC Whitney or similar, SloCruisers and maybe Cabe Toyota. I'd REALLY appreciate any directional help w/this as there seemed to be some conflicting info on the weatherstripping thread about part numbers and fitment of some of the pieces. I'd like to do it cheaper than the $2,150 kit from SloCruisers if possible. I'm sure the kit is great, but it's out of my budget for the moment - maybe if I do a more complete restoration in the future. . :
And nuclearlemon - It looks as though I may actually already have a muffler heatshield - see pic below. Is it common to add heat reflective material underneath to help w/heat transfer through the floorboards? I hate to add a dirt/water catch underneath, but I don't want to melt my shoes either!
Also have a quick wiper question. In the pics below, is the plastic end piece replaceable or do I need an entirely new arm? Is this the adapter part that comes w/some wiper blades? Also, How do the arms come off the wiper studs? There are no visible nuts - do I need to be more forceful w/the cover?
As I can only post 3 pics at a time, see next post for more. . .
Thanks a lot,
Tom