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D282 Cylinder #2


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I've worked on truck diesels for more years than I care to say. I have run into an odd issue with my TD6 62. It was skipping and I cracked injectors to try to find it, but didn't help much. I pulled the rocker cover and all valve train is working and none at too tight. I removed the intake manifold and immediately saw that #2 was wet. I cranked it over and sure enough it is popping back thru the intake. I  completely disconnected the injector line, and it still does the same. The exhaust valve is opening fine and the intake is working properly as well. I turned it very slowly until just before the intake opens, then slowly opened and sure enough it blows out intake. This acts like the exhaust is plugged solid yet the valve is clearly opening fine. This sat for a few years, my only thought is that a mouse made a nest in the exhaust port or manifold? I wouldnt think it could hold up to the pressure, but what else could do this? I'm soaking the bolts that hold the exhaust manifold on and will remove that next. 

 Any thoughts?

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No, the valves seal fine, it only blows back out of the intake when the intake valve opens. I had rocker cover off and could see valves operating. See above pic, the exhaust manifold was coked up enough that the exhaust couldn't escape fast enough that when the intake opened during overlap it vented out the intake. I cleaned the exhaust manifold and it no longer puffs out the intake. I have to pop test the injector from that cylinder but I believe it's a leaker.

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On 4/12/2020 at 5:21 PM, mrbrettbaker said:

No, the valves seal fine, it only blows back out of the intake when the intake valve opens. I had rocker cover off and could see valves operating. See above pic, the exhaust manifold was coked up enough that the exhaust couldn't escape fast enough that when the intake opened during overlap it vented out the intake. I cleaned the exhaust manifold and it no longer puffs out the intake. I have to pop test the injector from that cylinder but I believe it's a leaker.

I don't think that plugged port was bad enough to cause your issue, unless it was closed off more further inside.  I would be setting a dial indicator on the rocker and checking the cam lobe lift. Barring it by hand it, air should have been able to exit that coked hole. 

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