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Old 09-06-2016, 12:25 PM   #26 (permalink)
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Lugging them near stall..usually going up hill
Also bumping a dock. Bump, twist up, stall, un-twist, run reverse.
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Old 09-06-2016, 01:10 PM   #27 (permalink)
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whoa! no ignition to turn off

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Also bumping a dock. Bump, twist up, stall, un-twist, run reverse.
So when the engine is running backwards, are the reverse gears forward gears and vice versa?

part ridiculous question/part serious
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Old 09-06-2016, 01:22 PM   #28 (permalink)
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Every time you change the oil filter, re-torque the center bolt on the filter adapter.

It ruins your day when the seal blows out from under the adapter plate.
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Old 09-06-2016, 01:22 PM   #29 (permalink)
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whoa! no ignition to turn off

Fully mechanical injection and nothing other than compression needed to run, only way to stop them is to either remove their air supply or remove the fuel which in some cases ends up being the oil in the crankcase. Scary as hell when it happens.

So when the engine is running backwards, are the reverse gears forward gears and vice versa?

part ridiculous question/part serious
Yup, been many truckers injured/killed and lots of twisted trucks when lugging up a hill and dragging the motor down too low. They go for a lower gear right as the engine "stalls" and kicks over backwards just as the driver thinks they saved it and suddenly the truck is going the wrong way, trailer jacknifes and all hell breaks loose.
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Old 09-06-2016, 01:30 PM   #30 (permalink)
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If you turn the buffer screw in too far the engine will have a run away.
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Old 09-06-2016, 01:36 PM   #31 (permalink)
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Watched a concrete mixer start up backwards when I was a kid working with my dad. Guy stalled it as has been said. It started backwards. Cleaned that damn air filter out real good. Guy was a new driver, so he dumped the clutch and hauled ass in reverse. So yes forward years become reverse.
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Old 09-06-2016, 01:52 PM   #32 (permalink)
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When a 2 stroke diesel runs backwards,the intake and exhaust still function normally. The direction that the crank turns makes no difference.

The only issue I'm aware of is the oil pump may be direction sensitive.
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Old 09-06-2016, 02:17 PM   #33 (permalink)
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Yup, been many truckers injured/killed and lots of twisted trucks when lugging up a hill and dragging the motor down too low. They go for a lower gear right as the engine "stalls" and kicks over backwards just as the driver thinks they saved it and suddenly the truck is going the wrong way, trailer jacknifes and all hell breaks loose.
no kidding!! Instrumentation wouldn't show anything? I guess these are older trucks we are talking about too....

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When a 2 stroke diesel runs backwards,the intake and exhaust still function normally. The direction that the crank turns makes no difference.

The only issue I'm aware of is the oil pump may be direction sensitive.

You forgot about the water pump!

One last diesel noob question- the running backwards thing can only happen with a two stroke, I'm ASS-uming?
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Old 09-06-2016, 02:33 PM   #34 (permalink)
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https://www.youtube.com/watch?v=NgB1dDunbOg

Too much ether on a cold start will cause it too run away too.

Btw nice Petercar.

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Old 09-06-2016, 02:43 PM   #35 (permalink)
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I was waiting for the guy in the first video to remove some fingers.
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Old 09-06-2016, 02:44 PM   #36 (permalink)
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When a 2 stroke diesel runs backwards,the intake and exhaust still function normally. The direction that the crank turns makes no difference.

The only issue I'm aware of is the oil pump may be direction sensitive.
On the 2 stroke the oil pressure relief valve is directional dependent. You could mount it on the left or right side of the block. Depends on the rotations of the engine.

If you put it on the wrong side for rotation, you had zero pressure when it ran. First thing you check after rolling in set of main and rod bearings.
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Old 09-06-2016, 03:21 PM   #37 (permalink)
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One last diesel noob question- the running backwards thing can only happen with a two stroke, I'm ASS-uming?
Pretty much. Remember, the Detroit only has traditional intake valves, and bleeds exhaust out the side of the cylinder through ports. Every time the piston goes up, you've got air compressed and a shot of fuel from the injector to go bang. In a traditional 4 stroke you would be on exhaust... but that already happened on the bottom of the stroke as did fresh air incoming in a 2 stroke.


Here's what the sleeve looks like:

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Old 09-06-2016, 03:30 PM   #38 (permalink)
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Thanks for all the info guys, keep it coming. I have it parked in the shop and noticed a coolant leak coming from back side of engine on passenger side. Going to have to investigate it later.
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Old 09-06-2016, 03:33 PM   #39 (permalink)
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Pretty much. Remember, the Detroit only has traditional intake valves, and bleeds exhaust out the side of the cylinder through ports. Every time the piston goes up, you've got air compressed and a shot of fuel from the injector to go bang. In a traditional 4 stroke you would be on exhaust... but that already happened on the bottom of the stroke as did fresh air incoming in a 2 stroke.


Here's what the sleeve looks like:


6v71 has exhaust valves in the heads just like a regular motor. The slots in the sleave is the intake ports. The 6v71 has 4 exhaust valves per cylinder. The engines will not run without the supercharger. If you get into the engine for any reason leave all the carbon build up. If you start scraping it and dont get it all out its a bad day.
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Old 09-06-2016, 03:35 PM   #40 (permalink)
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Exhaust valves in head. Intake thru ports in cyl sleeve
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Old 09-06-2016, 03:46 PM   #41 (permalink)
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Got it... thanks for the follow up on my noob questions

Sorry for the side track discussion OP.
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Old 09-06-2016, 03:53 PM   #42 (permalink)
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One last diesel noob question- the running backwards thing can only happen with a two stroke, I'm ASS-uming?
I've seen it happen on 3 different 4 strokes as well. A Mitsubishi Bulldozer, an NHC-250, and a LDT-465 (deuce engine). The dozer was a pain in the ass. We couldn't stall it and turning the key off didnt kill it. Ended up having to yank the fuel line. All 3 also shit exhaust out of the intake and ruined the air filters.
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Old 09-06-2016, 04:01 PM   #43 (permalink)
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When a 2 stroke diesel runs backwards,the intake and exhaust still function normally. The direction that the crank turns makes no difference.



The only issue I'm aware of is the oil pump may be direction sensitive.


Wouldn't the blower(s) turn backwards?
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Old 09-06-2016, 04:14 PM   #44 (permalink)
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I've seen it happen on 3 different 4 strokes as well. A Mitsubishi Bulldozer, an NHC-250, and a LDT-465 (deuce engine). The dozer was a pain in the ass. We couldn't stall it and turning the key off didnt kill it. Ended up having to yank the fuel line. All 3 also shit exhaust out of the intake and ruined the air filters.
Wouldn't the fueling event be out of time? (now you got me thinking,lol)

Also, oil flow through stuff like main bearings might be a problem since some are designed directionally. (not directed at you specifically, just the backwards running engine discussion in general)
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Old 09-06-2016, 04:14 PM   #45 (permalink)
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I had a Cummins run away
Nut came off the turbo got sucked in, shredded the turbo so all the oil going to the turbo was getting sucked into the engine

Floor mat over intake didn't do anything

Split two Pistons broke the crank


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Old 09-06-2016, 04:28 PM   #46 (permalink)
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2 stroke Detroit diesels

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Wouldn't the fueling event be out of time? (now you got me thinking,lol)
No

Edit: maybe, but not too far off

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Old 09-06-2016, 04:46 PM   #47 (permalink)
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6v71 has exhaust valves in the heads just like a regular motor. The slots in the sleave is the intake ports. The 6v71 has 4 exhaust valves per cylinder. The engines will not run without the supercharger. If you get into the engine for any reason leave all the carbon build up. If you start scraping it and dont get it all out its a bad day.
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Exhaust valves in head. Intake thru ports in cyl sleeve
Whoops, made sense in my head at that moment. I'm too young to have seen much more than 60 series come through on the regular.

Either way, principle is the same. I don't know of any 4 stroke that can go backwards unless it was intended to.
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Old 09-06-2016, 04:47 PM   #48 (permalink)
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Wouldn't the fueling event be out of time? (now you got me thinking,lol)

Also, oil flow through stuff like main bearings might be a problem since some are designed directionally. (not directed at you specifically, just the backwards running engine discussion in general)
Nope.

The fuel still goes in at the same time.

And youll start burning your oil as fuel..

As for the previous blower question statement. Yes the blower will spin backs and just like you think its product will come out the intake. They will run without the blowers, just not make any power.

Ive slammed the mouse trap (the block off plate on the blower) shut and it kept running.

Interesting engines.
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Old 09-06-2016, 04:54 PM   #49 (permalink)
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I've had a cat 3306 in an old 980b loader run backwards. Was lifting the bucket and stalled it right as I kicked the lever off the detent. Took a second to figure out why the intake was blowing dust out and it was reversing all the sudden.

Edit we had an old ford water truck that was a Detroit and a Warner Swasey excavator as well. As everyone has mentioned they leaked like crazy (rust prevention feature) and are loud as hell. Not particularly good on fuel. But stout and great for new drivers as they are much harder to over rev.
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Old 09-06-2016, 06:18 PM   #50 (permalink)
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I've seen them run backwards and run away backwards. I don't remember what the common issue was that caused it, but 90% of the time it's someone inexperienced.
Same here. I'm not sure what caused mine to, but hearing that thing wind out with exhaust coming out of the air cleaner will wake you the fawk up! lol
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