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Database Forum Testing Area

Detroit 353 mot maintaining RPM's

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AL B

08-08-2012 13:35:48
71.173.69.137



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Hi , I have a mid 70's Detroit 353 mounted to a large irrigation pump . 2 days ago while I was pumping water I was in the fields and noticed the sprinkler heads were losing water pressure and then return to normal pressure then to lose pressure again and return to normal .

I went to the pump and every 2 minutes or so I could hear it kinda lugging or working hard to maintain RPM's . After doing obvious checks ( inspected intake screen on water suction pipe , installed new fuel filters on the engine ( primary and secondary ) checked the air filter which was clean I ran it again and it still was laboring to run normal RPM's .

The engine does not seem to be smoking while this is happening .

Maybe ejectors need adjustment ?

It just does not Rev up like it use to , seems to labor somewhat when I turn the throttle up to set engine speed .

Hope I can get reply's soon as I need to water my crops .

Thanks for any assistance .


AL

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Al B

08-09-2012 18:37:18
71.173.76.15



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 Re: Detroit 353 mot maintaining RPM's in reply to AL B, 08-08-2012 13:35:48  
I checked fuel pressure today 70 psi at fast idle , also connected a piece of clear tygon tubing on the suction side fuel line to look for bubbles to check for any air leaks and found none .

IF I do not fill my water pump priming tank to pump water right off and start the engine and run it , it runs excellent rev's up real nice sounds great etc .

BUT once I fill the priming tank of the water pump and start pumping water that's when the engine bogs down and the rpm's slowly drifts up and down.

I've inspected everything on the water pump ( inlet screen , inlet pipe outlet pipes , inside water pump housing ) thats all clean , once I apply a load to the engine thats when it bogs down .

Use to be able to rev it up with no problem when I needed to pump water before this problem started .

Going to have to have a good diesel guy come check it I guess .

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730d se

08-09-2012 17:03:43
68.189.186.53



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 Re: Detroit 353 mot maintaining RPM's in reply to AL B, 08-08-2012 13:35:48  
Likely a restriction in either fuel or air. It will not run good anytime if the injectors are bad, the fuel pump is gone, etc.
Check the complete air intake for anything that could be blocking it. Check entire fuel system, including inside the tank.
I had one that had a small mass in the fuel tank. It ran great until that mass got over the fuel outlet, then it would act up. I could let it sit a while (mass would move away from outlet) and it would run fine again, for a while.

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