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rebuilding some went really wrong


Created On Saturday November 12, 2016 01:53 Diesel Talk
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99Classic
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Note Saturday November 12, 2016 01:53 View thread in raw text format
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hello, im new torebuilding ddc engines but been in trk 17yrs. recently ive attempting to get my ddc4 12.7 detroit done run into sna foo, pulled it down cause useing excessive amount of oil. well pulled it down triangle on in front of cam to hold it still lined up timeing marks etc... well since replace mains, rod,rings,liners kits. sent head down to local mach shopdisgusted shop says need valve job, .002 wharp . told to fix it!!!!!! well get it back start reassembly rolling crank back n forth to insure its moveing . all so far so good. markes lined back up place head on block torque to spec. get to cam and bearings in place cam in cradle torque to spec try n bar engine and wont move,,,, loosen nut on gear back gear off n still wont move. im lost can anyone help please

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Loyd Hicks
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benjamin2606
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Note Saturday November 12, 2016 17:04 View thread in raw text format
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So you pinned the cam gear in place before taking it apart? Is it locked in place or can you turn it one direction but not the other?

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2000 Western Star 4964 14L 550 S60
2003 Western Star 4900EX 12.7 500 S60
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99Classic
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Note Monday November 14, 2016 00:06 View thread in raw text format
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Yes cam was lock n place

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Loyd Hicks
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benjamin2606
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Note Monday November 14, 2016 20:36 View thread in raw text format
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If the timing marks were lined up before you took it apart and you lined them back up, it should be fine. If the timing marks weren't lined up perfectly before you took it apart and you just rolled it around until they were when you put it back together, it's out of time and your valves are hitting the pistons. Other than that, I can't see why it would stop turning when you put the cam in. Maybe someone else has an idea

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2000 Western Star 4964 14L 550 S60
2003 Western Star 4900EX 12.7 500 S60
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ponway
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Note Monday November 14, 2016 20:50 View thread in raw text format
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I am no expert, that being said, If you had that head surfaced, I would say you need to check your gear lash.

First time I overhauled mine, I got it out of time, I was not aware of the "hunting tooth" timing. The crank will rotate I believe 50 some times before all the marks come back into alignment. I mention this only because you say you rolled the crank around putting cylinder kits in. That"s what I did and when I went to put the cam gear back on my marks didn't line up 2,3 or 4 teeth, so as difficult as is was, I lined them up and actually put it out of time. It lasted about 20 miles, piston to valve contact. Not a pretty sight and very hard on the wallet. But who said the school of hard knocks would be free.

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Wayne Pontius
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QUALITYTRUCK
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Note Wednesday November 16, 2016 13:39 View thread in raw text format
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When you "pop" the cam gear off, it should just slightly fall forward and remain meshed with bull gear without losing its place as long as you did not remove front cover. I would loosen all of the rocker arms and then try to bar engine over.
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99Classic
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Note Thursday November 17, 2016 02:51 View thread in raw text format
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thank you all for ur help so btw.we rolled it back n forth while dropping piston in, set it back to we started, i marked balancer to cover, cam gear to bull . marked as for those go they went rite back in place. never made full revolution w balancer marks. w/ that being said still believe its outta of time? went n had head mic. 6.4825 f/s 6.4865 in the back. so i know head good but my cam bearing # 1,4,7 show marks from where we torqed cam caps down, never got to rocker assy or jake boxes. wen it wouldnt move we stop

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Loyd Hicks
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QUALITYTRUCK
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Note Thursday November 17, 2016 16:39 View thread in raw text format
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Ohhhhh......not good! I would guess rod/main bearing install issue. Back track step by step until you find. Good luck.
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