Posted by Ragnarok on February 23, 2018 at 07:29:15 from (64.250.202.66):
In Reply to: Run away diesel!? posted by 56oliver on February 22, 2018 at 06:43:55:
Quoting Removed, click Modern View to see
Yes...the emergency flap or the cable are always stuck or un-hooked on the two stroke Detroits.
I over-hauled a 4-53 in a Oliver 1950 last summer. Of course the safety butterfly ahead of the super-charger was stuck...cable un-hooked to the governor...
I learned my Detroit lesson early on with a 8V71. Truck shop I worked in needed a 'new' engine for a customer's truck a cab-over Marmon. Anyhow..the customer bought a used..but supposedly 'good' 8V71 from a salvage yard. The lead mechanic and I got the power-pack out of the Marmon and had the replacement V8 hanging on the A-frame hoist and the lead man had the brilliant idea to start the thing before we installed it(good idea as it turned out).
I got a can of fuel rigged-up..lead man rolled our battery cart up to the engine. we set the engine down on wood blocks but still hanging on the hoist too. Jumpered the big Detroit and it took off right away and promptly began running away!!
We had the valve covers off so we could manually control the rack/racks...but no good!! The engine was just screaming and blowing solid black smoke and oil out the right bank...then the left bank too! I watched the lead mechanic disappear in the smoke as he was fumbling with the safety butterfly..I grabbed the fuel can and ran!! Engine would not die..just screamed louder with no fuel!!??...and blowing solid black smoke and oil out the exhausts....Lead man runs out of the cloud unable to shut the engine down!!
We just let it go!! The engine torqued itself off the blocks and swung around on the hoist until it's front pulley was against the leg of the hoist...was shooting sparks out the exhausts...and off the front pulley!!...all the while spraying oil and solid black smoke out the exhausts...it finally ran out of motor oil and locked-up....
There was a white Pontiac Grand Prix in the shop about ten yards behind the engine in line of the exhausts...the car was black with burned oil after the event!....I was black too...the lead mechanic was a black man anyhow...but he was really really black after the event!
Turns out there was a broken piston crown on the right bank...the piston cooler nozzle was supplying motor oil directly into the combustion chamber through the hole in the piston...the oil was getting distributed to all the cylinders through the air-box and she just ran and ran until she stopped....
We got a major azz-chewing for turning the bosses daughter's Pontiac black....No moral to the story except to always make for sure your Detroit's safety butterfly works
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