7.3l no start after rebuild - Ford Powerstroke Diesel Forum
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Old 08-28-2013, 07:39 AM
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7.3l no start after rebuild

1st time here- I did a complete rebuild of my 01 7.3 PSD after melting thru a piston. Put remanufactured heads on it, and used a Ford OEM rebuild kit with .020 pistons. Now it will not start. #1 injector is leaking oil out of the top, and I assume that will not allow the HPOP to generate enough pressure to drive the injectors. I replaced the O-rings for a second time on that injector, and even replaced the head b/c it looked like the machined surface was rough and might not seal.

Still leaking, is it possible the injector itself has cracked??

Also- when I am cranking it over, the oil pressure gauge does not move, and I have to keep refilling the HPOP reservoir. Is that normal?
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Old 08-28-2013, 08:22 AM
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as far as the injector leak , probably the injector itself is bad ,internals are worn , did you prime the base pump when installed on front of engine , sounds like you aren't getting prime , it does take quite awhile for all the oil to build back up after the engine has been apart and everything is dry , which im sure you know , if you have to keep filling reservoir then its not pulling oil from pan
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Old 08-28-2013, 08:34 AM
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Priming the LPOP

So, I did not prime the pump, didn't know it needed it. Will it catch eventually, or do I need to pull it off and prime it? If so, what is the procedure?
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Old 08-28-2013, 08:40 AM
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somethings' not right, with hpop draining back. Did you install the correct hpop gasket? Check the C.V. below the hpop / drivers side for debris..etc? Inspectthe standpipe from pan to hpop for crack/s? Use new injector orings? Lay a straight-edge across injectors for proper "seating"?
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Old 08-28-2013, 09:08 AM
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I don't think the HPOP is draining back, it is just not getting filled automatically as I crank the engine trying to get it to start. I put new O-rings on the injectors when I did the rebuild (OEM ford O-rings), and none of the other injectors seem to have a problem. Can't see any cracks or damages to the injector in question, and it wasn't dropped, pried on or mishandled during the process...
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Old 08-29-2013, 03:50 AM
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Quote:
Originally Posted by ffcrapp View Post
So, I did not prime the pump, didn't know it needed it. Will it catch eventually, or do I need to pull it off and prime it? If so, what is the procedure?
they can catch eventually but still doesn't need to really be spun over without some kind of lubricant , as far as procedure , just pack the gears with some assembly lube , Vaseline , wheel bearing grease , anything that will help it just catch prime ,and see if that makes any difference
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Old 08-29-2013, 02:56 PM
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As far as laking injector, can you put a fatter O-ring in the top groove to fix? Any chance the injector itself can crack?
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hpop, injector, oil leak

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