neo
02-21-2012, 12:28
Hi all, I am back from an extended vacation courtesy of my lovely employer. "Light Travel" is not what you would think anymore.
Anyway, about the time I left, a year and a half ago, I had built a 6.2 for my wagoneer conversion. When I started it up from the begining, there was a "cam-timed" knock that reminded me of a bad injector. During the trouble shooting, I changed each one out to no avail. Also checked compression, but did not notice any significant difference.
Becuase I had reused the lifters and was concerned about them, I decided to pull the heads and look at the cam wear and lifters. I have only had the time to pull the d/s head and found the lifters and cam apear fine (so far) however, and here it the nitty gritty, cylinder 1 had a noticable build up the other three did not at the top near the fire-deck. It also had a very slight redish flakes in the combustion part of the head aroudn the valves. The other three bores were very clean, little to no soot at the top and uniform in color. I looked at the gasket and did not see anything, but around cylinder 1 compression ring the gasket pulled away from the ring, like it was not uniform. This was between the water jacket and the cylinder.
Now that I think about it, the engine also seemed to put off a little white smoke when it ran. :( What I am currently hypothesising is that the gasket never sealed properly right there, allowing a very small amount of antifreeze in the cylinder on suction stroke, then did not allow the full combustion of the charge, leading to the knock (or perhaps retarding the combustion) and allowing this black sooty build up aroudn the top of the cylinder. These were not FelPro gaskets, but will be replaced with FelPro.
Any thoughts, provoking or ridicule is apreciated.
Neo
Anyway, about the time I left, a year and a half ago, I had built a 6.2 for my wagoneer conversion. When I started it up from the begining, there was a "cam-timed" knock that reminded me of a bad injector. During the trouble shooting, I changed each one out to no avail. Also checked compression, but did not notice any significant difference.
Becuase I had reused the lifters and was concerned about them, I decided to pull the heads and look at the cam wear and lifters. I have only had the time to pull the d/s head and found the lifters and cam apear fine (so far) however, and here it the nitty gritty, cylinder 1 had a noticable build up the other three did not at the top near the fire-deck. It also had a very slight redish flakes in the combustion part of the head aroudn the valves. The other three bores were very clean, little to no soot at the top and uniform in color. I looked at the gasket and did not see anything, but around cylinder 1 compression ring the gasket pulled away from the ring, like it was not uniform. This was between the water jacket and the cylinder.
Now that I think about it, the engine also seemed to put off a little white smoke when it ran. :( What I am currently hypothesising is that the gasket never sealed properly right there, allowing a very small amount of antifreeze in the cylinder on suction stroke, then did not allow the full combustion of the charge, leading to the knock (or perhaps retarding the combustion) and allowing this black sooty build up aroudn the top of the cylinder. These were not FelPro gaskets, but will be replaced with FelPro.
Any thoughts, provoking or ridicule is apreciated.
Neo