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Tractor Talk Discussion Forum

Injectors on old Detroit 3-53

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salsanta

10-11-2004 19:29:51




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Can anyone tell me how to bleed the injectors on an old 3-53 Detroit. I have an older Dynahoe (which I let run out of fuel). It starts but seems like it has lost all power. I changed the filters already (Prim and Secondary), filled them before I installed them, but still problems. Any help would be great.
Thanks
Sal




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salsanta

10-12-2004 16:08:35




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 Re: Injectors on old Detroit 3-53 in reply to salsanta, 10-11-2004 19:29:51  
Thanks everyone. I didn"t realize you do it with the fuel lines from the filter. I guess I was looking for a "bleeder" which would be off some type of injector, but the only thing I saw was the direct piping from the secondary filter directly into the head.
I am going to try some of the things tomorrow (I got home late tonight and its dark already). I will post how I make out. Again thanks for the help.
Sal

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lucas boy

10-12-2004 05:27:08




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 Re: Injectors on old Detroit 3-53 in reply to salsanta, 10-11-2004 19:29:51  

i usually fill the filters then loosen the supply line on the injector farthest from the pump till she starts,,that will bleed the air out while cranking..lucas



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Redmud

10-12-2004 03:39:46




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 Re: Injectors on old Detroit 3-53 in reply to salsanta, 10-11-2004 19:29:51  
The old Detroit was an easy engine to get going after running out of fuel, when one didn't want to fire off we would do what Harley said, a little air pressure in the tank, and you may have to remove the fuel return line from the tank while doing this. also check your emergency kill, maybe the latch was bumped and your intake air is shut off. I have seen detroits run this way, you didn't get a lot of rpm's but would run.
Redmud:

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NC Wayne

10-11-2004 20:32:03




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 Re: Injectors on old Detroit 3-53 in reply to salsanta, 10-11-2004 19:29:51  
You say you ran out of fuel and now it seems to have lost all power. Sounds to me like you could have a stuck injector. The fuel acts as a lubricant for the plungers in the injectors. If the fuel flow stopped the the injectors lost their only source of lubrication and one or more of them may have siezed. The way the rack is designed in a Detroit if one of them siezes at any point in the throttle range then none of them will be allowed to go past that point. This usually results in an engine that will start and go to that particular throttle level and then won't shut down with the fuel stop alone. However I have seen them where they will shut down but are weak when run, it just depends on wether the plunger is completely siezed in both directions or wether it's siezed to where it just won't rotate past a certain point when throttled up. Beyond that the a Detroit has a positive displacement gear pump for the fuel transfer pump so with everything right it should built pressure in the injectors without any problem simply by cranking the engine. One thing that I often see is that Detroit origionally put an orfice in the return side of the fuel system to help build fuel pressure instead allowing it to "free flow" and over the years it gets left out for one reason or another. If that orfice is missing it can cause a problem getting the system to prime, or if the fuel pump is simply worn out it can cause the same problem. In a case such as this I always take loose the fuel line coming out of the pump and the return line back to the tank an. Using a seperate jug of fuel I then hook it up to a small electric pump and let it prime til the fuel starts flowing out of the return line. Once you have flow hook everything back up quick and start the engine. I've never had this trick to fail. Good luck.

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Wardner

10-11-2004 19:49:22




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 Re: Injectors on old Detroit 3-53 in reply to salsanta, 10-11-2004 19:29:51  
Apply a vacuum to the return line while cranking. Do it with the siphon tube on a spray paint gun or something similar. You can also attach a long hose to return line and suck with your mouth.

If you are apt to run out of fuel alot, buy a hand primer or small electric fuel pump. Connect it to one of the 1/4 pipe plug taps on secondary fuel filter. You will need a check valve ahead of primary fuel filter.

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harley1983

10-11-2004 20:50:59




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 Re: Injectors on old Detroit 3-53 in reply to Wardner, 10-11-2004 19:49:22  
Another thing I have done off and on over about thirty years of experience on diesels from the 53 series Detroits to the 250 and up Cummins, cut a piece of plywood a little bigger than the fill hole on the fuel tank. cut out a piece of inner tube about the same size, place the inner tube below the plywood for a seal and drill a hole through both of them. Insert an air nozzle off an air line and put a little air to the tank to put a little pressure on the fuel system. Be careful not to get carried away and blow something up, but just keep triggering the nozzle to keep 5-10 lbs on the tank while someone turns the engine over. This usually picks up the fuel and gets you going. Later, Harley

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