I drove one of these as a boy and have recently have become interested in purchasing one. I have only looked at two to date, and both of them seemed to shoot white smoke from just one cylinder. The first definitely had a burnt exhaust valve or other lack of compression on the one cylinder, because it was really only firing on the other two. The second ran evenly, but still shot white smoke from one cylinder. The RD6 I ran as a boy, once started, put out absolutely no white smoke under any load condition.
My questions are: Are RD6's subject to burning an exhaust valve on one cylinder, say the middle cylinder, or perhaps from leaving them for long periods out in the weather with no can over the exhaust pipe, and is the white smoke issuing from the second tractor I recently looked at likely caused by a burnt exhaust valve or could it be from some other cause than low compression on the once cylinder, for instance like many modern diesel truck engines will shoot white smoke out the exhaust pipe due to a faulty injector?
My questions are: Are RD6's subject to burning an exhaust valve on one cylinder, say the middle cylinder, or perhaps from leaving them for long periods out in the weather with no can over the exhaust pipe, and is the white smoke issuing from the second tractor I recently looked at likely caused by a burnt exhaust valve or could it be from some other cause than low compression on the once cylinder, for instance like many modern diesel truck engines will shoot white smoke out the exhaust pipe due to a faulty injector?