3-53 Detroit rack timing

That crossed my mind too, trying to run backwards is just about the only way I see a 2 stroke diesel will backfire while running

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As well, the return line. If the restricted fitting in the head is plugged or the return line. The rack will go cock stiff when you try to turn it over. It won't allow the governor to pull out of no fuel position.

I know it's all comin out in bits, I'm working nightshift out of town. It's as it's coming back to me.

So in order, pull the valve cover, verify cam and crank are turning correct direction. Disconnect the governor rod from rack, crank move rack by hand while cranking. Guage fuel pressure. 50 psi is lots. Based on pressure and rack movement, pull transfer pump suction, install your own hose to bucket. Pull return, verify restricted fitting is free. Put your own return hose to bucket.

See where you are after that.





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would a CCW engine use a positive ground on the battery? If so we may try that....

Found this on another site Lynn:
Detroit Diesel 2cycle engine rotation. The model number will be 4 digits with a "-" or a space, and 4 more digits, ie 8083-7000. The 7, means normal rotation. 1,2,3,or 4 means oposite rotation. 5,6,7,and 8 mean normal rotation
 
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Lots of good info guys.. Bragg ^^^ and I are learning alot... Well try some more troubleshooting and see what happens... If a guy swapped the battery cables, and it was turning in the right direction, would it damage anything??
 
Well I'm not sure how the starter could ever turn the engine over backwards as the one way clutch in the starter drive wouldn't let power transfer.
 
Joesixpack said:
Well I'm not sure how the starter could ever turn the engine over backwards as the one way clutch in the starter drive wouldn't let power transfer.
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This. Or the bendix won't come out due to being spun the wrong way.


I've changed a awful lot of old tractors from positive ground to negative ground without doing anything to the starter and have never had one run backwards.
 
I wasn't suggesting that starter could drive the engine backwards. I agree, One would need to change to a ccw starter. To drive it backwards.



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1-5-3-6-2-4 said:
As well, the return line. If the restricted fitting in the head is plugged or the return line. The rack will go cock stiff when you try to turn it over. It won't allow the governor to pull out of no fuel position.

I know it's all comin out in bits, I'm working nightshift out of town. It's as it's coming back to me.

So in order, pull the valve cover, verify cam and crank are turning correct direction. Disconnect the governor rod from rack, crank move rack by hand while cranking. Guage fuel pressure. 50 psi is lots. Based on pressure and rack movement, pull transfer pump suction, install your own hose to bucket. Pull return, verify restricted fitting is free. Put your own return hose to bucket.

See where you are after that.





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1-5-3-6-2-4 said:
I wasn't suggesting that starter could drive the engine backwards. I agree, One would need to change to a ccw starter. To drive it backwards.



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Thanks.. Clears a lot up.. now just to wait til the rain stops so i can work on it...
 
well after some thought, the way the engine turns over, I don't believe it has much compression to it at all. I got the engine running on cheap ether only. Working the throttle a little bit and it barely changed anything other than one position would smooth out some. When pulled wide open, it had no effect at all. I checked the Rack travel and shut off position and everything seems fine. Seems it would only go up to about 800-1000 RPM maybe. Poured white smoke and oil out of the exhaust manifold and as soon as you pulled the ether from it, it would die. I'm thinking a rebuild is in order, altho i was doing some reading earlier and came across a statement that if the valve cover is off while running (which is what i did), it will start pulling oil into the cylinders...... not too sure how true that statement is tho.
 
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kino_fab said:
altho i was doing some reading earlier and came across a statement that if the valve cover is off while running (which is what i did), it will start pulling oil into the cylinders...... not too sure how true that statement is tho.
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I doubt it. When I was going through diesel tech classes, we ran a lot of Detroits without valve covers in order to bypass the governor with vice grips clamped on the rack. Granted, it wasn't much longer than 10 minutes at most.
 
it ran a total of about 45 seconds or so. gonna do a compression check tomorrow.
 
There's no problem running it with the cover off. I was suspect of no.compression, that's why I also said pull the side.cover and inspect the rings through the airbox. If you find rusted or wiped or stuck or broken rings. You will know there's no compression. You could do an actual compression test, but it would only tell you what you already know.

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Did a compression check today. A little on the low side with about 280psi, but it should still run on diesel. took the blower off and couldn't really see piston rings that well to see if they were stuck or broken. Only other thing we can figure that is causing it not to run is the injectors. Found 2 at a shop not far from here. Guy is letting us try them to see if it works or not. Altho gotta wait on a timing tool first.
 
Are the injector plungers moving freely? (the spring part)

If they are moving and the rack is moving freely it should be getting fuel. Timing cant be that far off unless a key way has went out.

I'd grab the rack with a pair of grips and try it again.
 
Why couldn't you see the piston rings in the intake slots? bar the engine over until each piston shows the rings in the intake ports. You didn't have to take the blower off. should of just pulled the airbox cover off the other side.
 
I cant even see the ports on my 53. They dont have the big air box covers like the the 71/92/149's do.
 
I've inspected 6v53s that way before. I didn't expect a 3-53 to he much different. Too bad. Mirror?

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I opened a 3-53 in my diesel tech classes. I was able to see the ports ok. Maybe some were different than others? I'm with Luke, snake a mirror in there if that's even possible.
 
it maybe possible to use a mirror. This skidder has a blade on the front that is chained up and is kinda in the way to get to anything on the side of the engine. Figured it was easier to pull the blower because the gov., lift pump, and fuel filters are in the way on the opposite side of the engine blocking the intake plate. The plungers and rack rod are moving fine, but we was told by an experienced mechanic that if the lash is set too tight on the injector it can destroy the internals with out notice after a while. We are honestly trying anythign we can because we do not know how many people have been into this thing before us or what they have tried.
 
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