70deuce
Active member
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- Franktown, CO
Look what ONE improperly torqued head bolt can do. One head bolt on cylinder #6 on my Cummins 250 (M81
was very loose. I found this out by first a tell tale sign of moisture dripping out of the engine breather tube, then oil in the water and water in the oil. Measured the temp on each exhaust runner with an infra-red thermometer and sure enough #6 was 120 degress cooler than the others. Come to find out it was a dead cylinder. The one loose head bolt has allowed water and oil to mix with each other. When that head was removed I had been sitting on the fender with both feet pushing against a ¾” drive socket wrench to get the head bolts loose. The culprit bolt was loose enough to get it to turn with hand pressure. Does not appear to be any damage to the engine. This truck has 53,000 miles on an original engine. Must not have been torqued correctly at assembly. A metal straight edge check for a warped head came up negative. The cylinder looks good also. #6 cylinder is on the left in the pics. Oil pressure never dropped. Check out the combustion area on the head and the completely gummed up injector, You can see a nice burn pattern on its neighbor #5 though it looks like one orifice on that injector may be plugged. A screw driver points to the loose head bolt opening. A puddle of raw diesel was on top of #6 piston. Also check out the pic of the culprit bolt and properly torqued bolt. Note the loose one was oil wet. All the rest of the bolts on #6 were completely dry. The weird part was that the M818 this engine is in ran pretty good despite running on 5 cylinders. Did red (52 mph) line fine but it sure didn’t like the 38 foot van trailer behind it on hills. It looks like a new head gasket and the proper torque may give me back the 855 CI I’m supposed to have.
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