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MEA MAGNUM OPUS (My 1947 Autocar U-70 build)

Posted By Wolfcreek_Steve 9 Years Ago
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Tony Bullard
Posted 2 Years Ago
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Yeah the piston pin retainers are concave seals like an expansion plug. The pressurized oil in the connecting rod doesn't enter the piston pin. It goes around the floating pin and on to the cooling squarters. Any pressure that gets past the the rod bushing falls to the pan. The piston bushing are splash lubed and not much oil gets past them. If there is a lot of oil running out of the are box drains I'd be looking at the blower seals. The intake side of the blower will still be dry.





Tony
W921
Posted 2 Years Ago
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I see old big block gas motor homes selling at farm auctions really cheap. Some (I think gm?) Had non computer Alison automatics in them? This might be a simpler easier solution for you? One thing about these motorhomes is they sucked so much gas that most of them are old but have little mileage. Could you just make an adapter plate and linkage or cables?
Wolfcreek_Steve
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I have the modern Allison already, similar to the one they use behind the diesels in Chevy pick-ups. The version I have will bolt up to the Detroit with a simple adapter ring (SAE 2 to SAE 3) The firetruck came with an older style Allison, but it was a 4 speed and without overdrive, just wasn't what I wanted. With 32" tires, 3.54 gears and a .64 overdrive, I should be able to run 120 mph at 3,000 rpms. (that old Autocar be shaken like a puppy poopin peach pits)


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“He, who is without oil, shall throw the first rod” Compressions 8.7:1
Steve Peterson
Central Wisconsin

Follow The Leaders For They Know The Way AUTOCAR

Wolfcreek_Steve
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Today I finally got around to tearing down the Detroit in preparation for a rebuild! You could have knocked me over with a feather when I pulled a head and found this!
http://forums.justoldtrucks.com/uploads/images/61165847-9eab-4a0b-b392-e785.jpg
http://forums.justoldtrucks.com/uploads/images/f2cd7d09-2dac-4ad2-a403-eba2.jpg
Now we know!
Newfie Trucker lived in the small town this firetruck came from and he mentioned that he had seen the firetruck in a shop getting engine work done sometime before I bought it. Seeing as how I found many loose and missing nuts and bolts, I'm thinkin' someone was punching way above their weight and didn't get a valve keeper in right.
It will need a different head for sure and I haven't gotten to the crank yet to see if there is damage from oil starvation.


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“He, who is without oil, shall throw the first rod” Compressions 8.7:1
Steve Peterson
Central Wisconsin

Follow The Leaders For They Know The Way AUTOCAR

Aaron
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Well now that'll dog an unnecessary hole in ones back pocket.


Driving the greenies nuts
http://www.killcarb.com/
Tony Bullard
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Wolfcreek_Steve (11/23/2019)
Yeah, I don't follow the masses much!
I decided I wanted the Detroit just because the logical choice would be a 5.9 Cummins, so I found a small firetruck with one on Ebay for $2500, sitting down in Kentucky. Unfortunately, shortly after I set out for home with it, something came apart inside the engine and it was blowing a gallon of oil out the exhaust about every 2 1/2 miles. I had it hauled home and the truck was dismantled, but I haven't torn the engine down to see what went wrong. (I suspect a wristpin seal)
At present I have the cab off the truck and in the garage where I can work on it this winter. (finish the floor and insulate, plus a million other little things)


We now know where the oil was coming from.



Tony
Michael Yarnall
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Steve,
I’d like to get that bumper from you if we can figure how to get it to PA. Good luck with that engine. Thanks. Mike.

Michael Yarnall,

Boyertown, PA


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