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Bad manifold??? AKA : (How I spent Christmas Day
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Posted by AC on December 28, 2003 at 05:22:58 from (67.27.116.148):
I got my M running for the first time in 20 years Christmas day. It sat out for about 6 to 8 years, and got one good drink before someone put a can over the manifold. I pulled the head, broke the front two cylinders loose (actually, the motor had been soaking for 4 months, and broke free quite easily. The rear two cylinders were not stuck. Anyway, the cylinder walls were good and the pistons were good. I cleaned them up. I then took out the valves and cleaned them up, and cleaned the head. There was a considerable amount of rotted metal from the manifold in the cylinder ports above the two cylinders that were stuck. I then removed the manifold only to find about a can full of rot and rust. The outside of the manifold is quite rotten and has a hair line crack, but does not seem to leak. But there was a tremendous amount of rotten metal and rust that came out of the manifold. So I got it running. It runs on the two back cylinders that were not stuck. The two fronts pop every now and then, but the spark plugs come out clean and cold. Its a crying shame because the two rear cylinders run with no smoke at all and if the front two would kick in, I think It would run well. Do you guys think that the manifold is so rotten in the inside, that it is keeping most of the fuel/air from traveling to the cylinders in the front? Appearantly, most of what fell off ended up in that part of the head. I have tried about everything. I have all the valves working properly, I lapped the HE!! out of the valves just to get them to seat properly. The valves are on good shape. The seats could be better, but I cleaned it up pretty well. It has good compression and blows my finger off the plug hole HARD...I am running out of things to try...Thanks...AC
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