critter Posted June 4, 2014 Share Posted June 4, 2014 Hi guys,I had my 1986 R in the field the other day idled up to around 1,000 rpm's using the air to run an impact wrench. All the sudden out of the blue the engine started pecking, I immediately shut it down checked the oil all good. Eased it home and with my high tech steel rod chased the sound to the valve train. Pulled the covers off found a dynatard solenoid loose and stripped out, replaced the front rocker shaft and solenoid ran the complete overhead. Didn't help at all, with engine running i loosened each injector line one at a time the noise never stopped which leads me to believe the noise is in the top. All valve adjustments look the same so I don't suspect a tappet problem. Please help, harvest starts next week got to have a dump truck... Quote Link to comment Share on other sites More sharing options...
wheeler73 Posted June 4, 2014 Share Posted June 4, 2014 I would leave the covers off and run the engine and feel each rocker arm and see if you can feel the noise. Is there a miss fire? Quote Link to comment Share on other sites More sharing options...
critter Posted June 4, 2014 Author Share Posted June 4, 2014 I have held down each rocker while running none loose and can't stop the noise, no misfire just a slight fuel knock which is normal for this engine.Thanks Quote Link to comment Share on other sites More sharing options...
b61mack Posted June 4, 2014 Share Posted June 4, 2014 I have had that happen on 2 valves, what it turned out to be was broken rings working there way on top of pistons. it just takes a little piece of the ring on top of piston to have a slight knock. Quote Link to comment Share on other sites More sharing options...
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