Runaway Diesel???

[98rammer]

Re: Screamin Detroits...

Originally posted by FFutch

... When we would mess with the rack on one,we would usually have 3 people around when we started it. One with vise grips on the rack,one with a shut-off board at the intake,and the failsafe guy with a big hammer at the fuel lines . I seen one run-away at a diesel school and the kid threw a paper back shop manual over the blower intake,yep it ate it ,good thing it was just a trainer engine. I've seen a few 3406 cats run-off if the rack in the fuel pump wasn't right,or if someone put on a new turbo without cleaning the oil out of the after-cooler from the failed unit. A diesel runs dam good on motor oil . Hey diesels don't run-away,just the mechanics :... Doug

must have been Wyotech

 

[RThompson]

I think we can add the 51 series and the 110 series to the uniflow designation. 51 series didn't stay around to long BTW. Another odd motor was the 8V53, it kind of overlapped with the 6-71 in regards to power output.

 

[Skydiver]

Oh the memories.

In or on about summer of 1995 my uncle found a very good deal on a charter boat in Panama city beach Fl. He was happier than I have ever seen the old man. On a moments notice he swings by my home town and says lets ride down to check out my charter boat. The deal wasn't even final.



After asking him 20 questions about the 69 hattaris(sp) it sounded like it really was a good deal. Next morning. Water in the port engine oil. Guess who gets to tear down the 8v71. ME!!!



Next month I really want to go bottom fishing so off to p. c. beach.

I found water leaking from a hose going to the heat exchanger on the starboard engine. The old detroit was hot,the engine room was small. So i said lets let it cool. Next morning fixed the leak even ran it up to 195 degrees to check for leaks. (These marine engines have a sealed cooling system and the water leaking from the hose was keeping the pressure on the cooling system down) No leaks. Wait. That afternoon we were to go on a 3 hour tour. THE starboard engine will not even spin over. It will turn about 1 round then stop. 5 minutes later it will turn 1 round only. I said it sounds like it is hydro-locked. Well after installing 2 rebuilt starters it ain't no better. I said "uncle lets pull the side plate off the engine" well sure enough water comes rolling out.

3 weeks later both engines having had heads replaced I am thinking I will finally get my fishing trip in.

I am in the wheel house at the wheel I notice the starboard engine losing rpm's so I bring it back to an idle and it dies. The temp guage in the wheel house was not working but the temp guage in the cabin is pegged. A lose fitting on the exhaust cooling port. It lost its water. We let it cool for 2 hours refill it with fresh water and it smokes all the way back to land. About 8 miles. 2 bent valves and some slightly scorched cylinder walls.

I only was responsible for tearing down these Detroit's. My time off did not allow me to remain in Florida and reassemble.

When these 8v71's are running good you can't beat them for a marine engine. The like to be ran fast.

I have not been back to that boat since.

Disclaimer:I do not have any interest in any boat that runs a Detroit.

Tim

 

[Blakers]

Originally posted by RThompson

Another odd motor was the 8V53, it kind of overlapped with the 6-71 in regards to power output.

I bet that thing really screamed! We had a 4-53 in a C-65 Chevy. What a dog! But it was only 212 cubic inches. Had about the same power as our C-60 with a 350 Chevy V-8. No torque on either.



The best thing about a Detroit is they're the most efficient means ever developed to turn diesel fuel into noise!

 

[pepecat]

P.S. Runaway leading to scatter

One time (@ band camp) a contractor was changing his oil in a few of his forf P. S. rigs. Apperantly he got confused and added a full servicing of oil into the engine without draining the old oil, started it up and it ran like mad off of its OWN engine oil getting past the rings... It ran in the upper echelon of RPM's for a while and the fire dept across the street heard it and came running over. needless to say there was nothing they could do and it was scatter time... Don't do this is your cummins!

lol

 

[RM]

If you ever run in to a cat engineer tell him you ran the rack on a 3116 and watch him turn blue. i dont see the difference but some how engineers do. no sense of humor i guess

 

[PRyker]

I owned a 44' Trojan Motoryacht for a few years (Yes, I know, trojan!! I got so much teasing about that). The boat had twin Detroit 671 Naturals (no turbo). Man I loved them engines!! They sounded soooo sweet and were work horses. Never failed me!! I still day dream about them monsters!



Anyways, the boat had a large flap (for lack of a better word) that would close the intakes off in the event of a run-on. Never had to use it but the previous owner told me he did once. I had to put Walker airseps on them cause they were dirty oily beast heaving out oil vapor all over my pretty engine room.



Phil

 

[stumphumper]

You might want to pull an oil analysis on that rig. Could tell you info.