I admire your energy and perseverance Paul. BTW, why the fusible links to power the ECM instead of fuses or resettable breakers?
As usual, you're too kind.I admire your energy and perseverance Paul. BTW, why the fusible links to power the ECM instead of fuses or resettable breakers?
The 65 mile drive revealed a venting issue with the differential. There seems to be an unexpected oil flow phenomenon. I wish I could see inside while it is operating, but I cannot. For whatever reason, the baffle is rendered ineffective, and oil is getting pumped right out the vent hose. It looks like I lost about 3 cups of oil going to the DMV. What a mess! Everything was so clean and tidy before.
So to keep an eye things and find out what's really going on, I rigged up a quick catch-can of sorts. Just an upside-down oil-dispensing bottle from the dollar store. I added two tubes to it--one short one for the oil, and one tall one to let the air out of the bottle.
On initial warm-up, it pushes a lot of oil out. Once temp cycling starts with going up hills, coasting down them, stopping in towns, etc...it starts to suck the oil back in.
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This isn't the final solution of course, as it doesn't really fix the problem. I was also surprised how much oil it pushes out on a 10 mile warm-up trip! Yikes. I'm going to need a bigger bottle, or a proper fix in short order. At least the mess has been stopped for now.
Since the coach is so well mannered, I felt pretty good about having the wife drive it. In our four years of owning the Glenbrook, she has only driven it at a boat ramp once. Carburetors and their quirks can be a bit of a challenge, and when you're 12,000 lbs, the stakes are high.
So Sunday, she got to drive the Palm Beach all around the local back roads, and both the kids got to come along. It was the first family drive, and they were pretty excited. My wife decided it's the coolest thing she's driven to date. I can't disagree!
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I'd noticed evidence of the diff being hot-ish. The old oil was cooked in places, and was building up carbon crud like the inside of a neglected engine. I'd never seen that in a diff before. I scraped out everything I could. I've pondered filling it with diesel and letting it idle in the air for a while. I'd bet it still had the original 70's oil in it. You can see how dark the new oil is already (benefit of the glass catch can I suppose).There was always discussion years back and concensus that the final drive can be run a little low. A few had issues with it burping out oil and tried a few things and eventually put the level down an inch from the fill hole rather then level and that seemed to solve the drain issue.
I had a 3.07 with the stock vent setup(felpro gasket with groove to the tiny hole in the top of the cover. And now a 3.21 that vents out the flange. No issues with fluid loss running 1” low.
Same with the 3.42 I installed in my friend’s eleganza.
Only other thing is that it has been noted the final drive does get surprisingly hot per those that put temp guages on.
Glad your family enjoys driving.
Larry, the missing puzzle piece is somewhere in the last few pages of this thread. Long story short, my vent is custom. That's why I'm able to plumb a hose to it like this. Everything else about the diff is original and crusty. I have a drain plug and a vent port in the cover. The desire was to be able to change the oil regularly and easily, without having to source the now incorrect diff cover gaskets, and then needing to fabricate correct ones each time. I'm happy to report the diff itself didn't leak a drop from its seals or the gasket-free cover. My new vent hose up my the frame rail has been puking out the oil though.Something else is going on here. It should NOT be puking oil out of the vent, especially if it is filled to 1" BELOW the filler. Is the FD a new one or has new ring and pinion? If so colld be tolerances are tight and heat is gears trying to break-in to each other. I wonder if the oil you are using is creating the elevated temps and making it almost boil out. Is the FD noisy with a speed whine? I have been using Amsoil 75W140 from the first day that I installed my 3.21. I have changed that oil 3 times in the last almost 100K miles and each time it comes out as clean as the day I put it in. I have never noticed that the FD is excessively hot after long 8hr days on the road. I'd say temps were 110* or so. Not hot but on the edge of warm/hot. Using a stock cover, not fined aluminum. Also, my guess is that you've somehow blocked the vent, either over tightening the cover bolts or gasket sealer squashed out and has blocked the vent. It just should not be puking oil. Keep us posted on what you find.
Funny you mention that, it's on my to-do list to shop for a temp/pressure sensor so I can try to kill two birds with one stone. It's an easy add-on with Winlog for sure.I've been wondering if transmission line pressure is something we should start monitoring.
Our transmissions are getting old and leaky inside. If the transmission pump can't keep the line pressure up, then the "clamp" on the clutch packs is going to drop and the clutches will start to slip amongst other problems.
When I had the engine rebuilt, I also had a rebuilt transmission installed. It had random issues with shifting from 1st to 2nd. After 10 years, it finally was not shifting most of the time, yet I could shift it manually. So I took it in for a rebuild, and it operated the same way on the first test drive. The line pressures were low, yet they could not find an issue. So another core was used for a rebuild and installed. Its been fine for the past 4 years, knock on wood.
Just a pressure sensor wired to my EBL would allow me to see the transmission line pressure and maybe warn of a problem before it happens on the road.