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7.3 Engine Re-Build Help

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Old Aug 10, 2010 | 10:35 AM
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7.3 Engine Re-Build Help

I need some help from readers.

I recently finished rebuilding my 7.3 diesel, had a small pinhole in #7 cylinder squirting water into it. The machinist determined it could have been due to a casting flaw. he had a couple of other machinist look at it also.

My problem is after I put in the crank the instructions told me to put the mark on the crank in the twelve o'clock position then aliagn the marks on the camshaft gear with the marks on the crank. Number one cylinder is in what I will call "mid-stroke". If anyone could verify that is the correct position of the cylinder with the two marks lined up, this would be very helpful to me in order to complete this rebuild and put the engine back where it belongs.

Thank for any help
Rad Duke
F-350 Head Replacement pictures by nstig8r - Photobucket

 
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Old Aug 10, 2010 | 11:18 AM
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I would have bet a buck that #1 should be TDC. So hanging out to learn something.
 
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Old Aug 10, 2010 | 11:22 AM
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same as above. usually motors get assembled and timed cyl#1 at TDC. I've never done a 7.3 though!!!
 
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Old Aug 10, 2010 | 01:59 PM
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Originally Posted by NSTAG8R
I need some help from readers.

I recently finished rebuilding my 7.3 diesel, had a small pinhole in #7 cylinder squirting water into it. The machinist determined it could have been due to a casting flaw. he had a couple of other machinist look at it also.

My problem is after I put in the crank the instructions told me to put the mark on the crank in the twelve o'clock position then aliagn the marks on the camshaft gear with the marks on the crank. Number one cylinder is in what I will call "mid-stroke". If anyone could verify that is the correct position of the cylinder with the two marks lined up, this would be very helpful to me in order to complete this rebuild and put the engine back where it belongs.

Thank for any help
Rad Duke
F-350 Head Replacement pictures by nstig8r - Photobucket

Was the hole in the cylinder wall? If so, did your machinist repair it? ...mike
 
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Old Aug 10, 2010 | 02:29 PM
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Originally Posted by katula
Was the hole in the cylinder wall? If so, did your machinist repair it? ...mike

yes about the 4 o'clock position, he bored and sleeved it
 
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Old Aug 10, 2010 | 02:53 PM
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Well that looks like #8 too me (Oil Cooler and drivers side up-pipe shown). Number one is the front cylinder on the passenger head.
 
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Old Aug 10, 2010 | 03:42 PM
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i think i got my left and right banks reversed.

all the marks were aligned (crank gear/cam gear) and the harmonic balancer mark was put at the 11 position when i installed the rocker arms.

should i be worried anymore and continue?
 
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Old Aug 10, 2010 | 03:52 PM
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I would set it back to #1 and re-check everything.
 
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Old Aug 10, 2010 | 03:56 PM
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