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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Detroit Diesel fuel pump

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Thomas R. Spiva

02-09-2008 20:02:01




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Anyone have any idea what kind of pressure I should have on the fuel lines from the pump on a 3-53 Detroit Diesel?
Can I check this at the top of the secoundary fuel filter canister where it appears there used to be some sort of sending unit?
This is on a 57 Michigan Loader and I'd sure like to find a engine manual if anyone has one.




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Thomas R. Spivak

02-14-2008 16:51:43




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 Re: Detroit Diesel fuel pump in reply to Thomas R. Spivak, 02-09-2008 20:02:01  
I found when I went to install the new injector tubes that the center injector was loose, the bolt that holds the clamp had come out and the injector was moving around so the tubes broke. As well, the brass sleeve that goes into the head for the injector to seat on had come up about 1/8 inch. I tried tapping it down aor geting up but did not want to damage it further so I opeted for putting the inject back in and tightening down again.
Machine is starting very well with more power but I suspect the injector is not seating correct now and will need to replace that brass sleeve. How to get it out and reinstall?

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Jon Hagen

02-12-2008 13:46:35




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 Re: Detroit Diesel fuel pump in reply to Thomas R. Spivak, 02-09-2008 20:02:01  
The only reason for those injector pipes breaking is over tightning and twisting off the flare. The nut is very large for the line size, so just snug is right and tight has likley cracked the flange BTDT.



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Thomas R. Spivak

02-12-2008 13:20:27




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 Re: Detroit Diesel fuel pump in reply to Thomas R. Spivak, 02-09-2008 20:02:01  
Well, I took the valve cover off and found that two of the injector lines had snapped off at the fittings and I guess one had finally popped out of the fitting resulting in hard starting and loss of power. Judging by the look of the the broken ends I would say they had been broken for some time as they were peaned over and polished smooth from vibration.
It's a wonder it ran at all, and assuming that everything is ok when I get the new set of lines on, I would say these are some tough engines.
Thanks for your help guys, and I will be getting the oil changed as its full of diesel now. Good engine flush I suppose.

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RENE'S

02-10-2008 05:35:50




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 Re: Detroit Diesel fuel pump in reply to Thomas R. Spivak, 02-09-2008 20:02:01  
YOU DID NOT SAY WHAT YOUR PROBLEM MIGHT BE BUT THE SEAL IN THE PUMPS CAN FAIL WITHOUT LEAKING FUEL BUT SUCKING AIR AND MIXING IT IN WITH THE FUEL. CHECK FUEL FLOW WITH CLEAR LINE. RENE'



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Bendee

02-09-2008 21:16:25




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 Re: Detroit Diesel fuel pump in reply to Thomas R. Spivak, 02-09-2008 20:02:01  
Series 53 engines
make sure readings represent true values,and instruments are accurate.

Fuel pressure..psi[normal,at cylinder head inlet passage. 45-70 at 2500rpm same for in-line but at 2800 rpm.
Fuel spill... gpm [minimum] no load .6 at 1200 rpm, 2500 rpm and in-line 2800 rpm.. Oil pressure ..psi.. at 2500rpm normal 40-60. minimum for safe operation 32 psi.
all in-line readings are at 2800 rpm.
Coolant temperatures. [normal] degrees F. 160-185.
Lubricant..MIL-L-2104B SAE 30 recommended for year round use.use of lower viscosity oils or multigrade products will usually result in less than normal engine life.

Can verify this.. used a multigrade recommended for diesels..using 2 litres a day..eventually blew a piston. 6V53. good engines..love the sound..

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Sam from WA

02-09-2008 22:42:00




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 Re: Detroit Diesel fuel pump in reply to Bendee, 02-09-2008 21:16:25  
I work on heavy equipment for a living. NEVER, EVER use multigrade oils in a Detroit diesel 2 stroke engine. unless you like buying oil, stick with SAE 30 oil. we've had mechanics ruin a detroit 8V-71T by using 15W40 in it. i love the sound of one of the old detroits, which is part of why i am in the process of putting a Detroit 6-71TA (turbo, aftercooled) in my 1994 Dodge one ton. just a fun toy and project.

enjoy your detroit, don't curse it, it won't get ya anywhere.

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tw

02-09-2008 20:46:47




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 Re: Detroit Diesel fuel pump in reply to Thomas R. Spivak, 02-09-2008 20:02:01  
10-15 psi at idle & up to 72 psi at n/l. You need to check press at the "out" fitting on the secondary fuel filter.



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Bendee

02-09-2008 21:32:29




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 Re: Detroit Diesel fuel pump in reply to tw, 02-09-2008 20:46:47  
Exhaust smoke analysis with water temp at 160degrees F..minimum.
Black or gray..1.incompletely burned fuel 2.excessive fuel or irregular fuel distribution 3. improper grade of fuel. Blue smoke.. lucricating oil burned in cylinder [blown through cylinder during scavenging period]

White smoke..misfiring cylinders... which is unburnt fuel $$$$$$$$.



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