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Old 08-04-2017, 10:35 PM   #1
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Valve job question

Exhaust side valve 1st. Cylinder.
After loosening the retaining screw i had a difficult time turning the adjusting screw. I turned quite a bit until it loosened up but couldnt set a gap. It looks like it is turned out too far.
I turned it over for a minute or two getting diesel to the injectors. It really sounded nice. But i didn't start it.
I didn't see much travel in the valve. If i start it and that cylinder doesn't exhaust what could happen ?

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Old 08-05-2017, 08:37 AM   #2
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Its a 5.9 cummins 12 valve by the way

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Old 08-05-2017, 11:44 AM   #3
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So it's a bent push rod. Anyone know a good mechanic in chillicothe ohio? Or even a decent tow?

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Old 08-05-2017, 12:08 PM   #4
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I can't believe all the bad luck im having with this thing. I got the rod straight and it works now, but It doesn't sound right.

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Old 08-05-2017, 12:26 PM   #5
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The problem, and I am far from a mechanic, is something caused the bent rod. Timing? Wear? Need to figure that out before you do anything else. If you can limp it to a mechanic, that would be a good start.

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Old 08-05-2017, 12:54 PM   #6
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Thanks. Timing on a 5.9? Valves are not my speciality. It runs tho. Not well but it runs

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Old 08-05-2017, 01:04 PM   #7
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Timing is in the fuel system on diesels. But valves are actuated by the cam. So fuel timing causing detonation? I am really sketchy on diesel engines. If the lifter isn't perfectly straight your probably not seating the valve all the way. If it isn't already damaged, running it is going to cause the valve seat to wear. If it wears too much, it could be the difference between a new push rod or a valve job, or even new heads.
The valve lash could have been out of spec to cause a bent push rod.

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Old 08-05-2017, 01:05 PM   #8
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Sorry, I am just throwing whatever I have gleaned out there.

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Old 08-05-2017, 01:28 PM   #9
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This is where I'm at? Without pulling the head I'm not sure how to tell

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Old 08-05-2017, 01:51 PM   #10
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You can check the rest of the valves for lash. I don't know if you can change 1 push rod. The lifter should be checked too.


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