Diagnosing a sick Detroit diesel 671
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- เผยแพร่เมื่อ 27 ก.พ. 2019
- I rebuilt this very engine 3 months later. Fresh rebuild DD 671 • Fresh rebuild DD 671
This was a sick detroit diesel 671. Running on 3 of 6 cylinders. Big hole in a piston. Still running of course.
That thing was boogered up pretty badly! Doesn't surprise me that she was still running, though. Good old Detroits were made to last because we didn't know how to build them any other way. Love those things.
A Jimmy will always get you home. If it aint leakin', it aint runnin'.
I don't know much about diesels, but I find this incredible that it kept running with that much damage.
Used to work on the 671 on LCM 6 while in the Navy stationed with Sea Bees back in the early 1960s. Had a few runaways but were pretty much bullet proof! Great old dependable engines that stood up to all the abuse a coxswain could throw at. Man could those guys handle a boat!
In the 70 and 80 I worked on every possible 71, 53, 110, 149 and 92 series you could ever imagine. Seen many 12V71 with 4 pistons with holes in ROCK trucks that were overspeed
Great video, and wow. What a hole. I'm wholly impressed with how much damage that engine could take and keep on running. It takes "reliable" to a whole new level.
wow back when they made things to get serviced too, so nice.
Now there's an award you don't want to win: "Definitely the biggest piston hole I've ever seen!"
Detroit Diesels are great - just love them. DD was my customer for many years, spent a lot of time there, used to call me when they had something special on the dyno like one time a huge mining truck engine. Also spent time at Electro Motive and was in dyno rooms testing locomotive engines. Last year was on a USCG buoy tender with two EMD V8 for startup after a long sleep. And . . . I have a pair of 8V71TI’s in my boat.
My first experience with a Detroit was a 671 in a 10 yd dump truck and it dropped a valve just like this video. I took the head to a old timer machinist down the road and we got the injector out cleaned up the head put in new valves and seats guides and reground the other valves. I put in a new rod cyl and bearings put it all back together, made sure I was right ready to slam the run away flap shut if the engine ran away. Didn't know any thing about setting the rack or this engine other that reading the book. It all came out well and ran great after that. Then went on and drove a water tender for the forest service behind an 871, got the job as I was the only person who was familiar with a Detroit 2 stroke Diesel! Past drivers had blown the engine up! Great engines but have their quirks.
This engine deserves to live! That's a lot of damage it took and still ran, so while it's expensive, it's worth the work.
That piston has the custom hole just to make sure the cylinder gets full lubrication.
I am glad I watched this video. Now I can really see how the engine is oriented in the bus, and what it takes to remove and install the engine if necessary.
I worked on the Jimmys when I was serving my apprenticeship a long time ago. I also worked on EMD's. The easiest way to narrow down a weak cylinder on those was to climb up on the roof and listen to each exhaust. One day a fellow apprentice and myself climbed up on to the roof to listen to an engine which had the brakes on full,but was in Notch 8. This was to make it work so the dead hole would show up.... while we were there, it started moving . the handbrake wasn't on.
Dude. Ive been binge watching all your great vids. I can't believe you're wearing gloves!!
Dead engine? There are 5 cylinders that make it start and it did reach the workshop! It is true that it is expensive to repair, but it is an engine that can continue to give much more after a readjustment and change of parts.
I've seen a 6V92 rear engine coach still move under it's own power with a broken crankshaft, just lost the rear two cylinders so no A/C or battery charging or cooling fan. They are tough old engines, starting to get thin on the ground here in Australia now.
Beast. Would have been cool to see more on that one
Worked on the ol 71's for years in the Navy, nice and simple like a SBC.
I use to make parts for DD engines back in the day.