![]() ![]() Yes I'm sure you might find a D6 to actually cost more than the D8 but if you plan on selling it after the project is done that may cancel itself out. Might be better off buying a smaller machine like a D6 even if it takes a few extra passes to move the same pile of rock. It not only saves any cost of a machine failing at the wrong time and hopefully you get someone who knows how to run the machine and therefore get a better job done in less time.īut if you are looking for a machine to just play around on and don't care how long the project takes go for it but have your eyes open wide as any machine of that size can cost big dollars to have even simple repairs made. Sometimes I think one is better off hiring somebody with a machine to do the job. Guess a lot depends on what your project is and how many hours you expect to be using this machine. It is a newer and in many ways an improved design. ![]() I would be more interested on how well the machine was taken care of than if it did or did not have a spacer plate engine. They are very old machines now, have acquired many hours of wear and tear and need someone with a lot of experience to operate, maintain and repair them in a way that will allow you make money on their operation.Ĭlick to expand.In my opinion, and it is worth every penny you pay for it, I would say no. Your questions about the D8 indicate you might be a little light on experience to be using these machines in any production application. If what you are looking at has the muffler under the hood, run away. Overheating became a big issue until the exhaust system was modified by putting the muffler on top of the hood. The big issue with the "K" engines was the placement of the muffler under the hood. It did bring up other issues with trying to get that spacer plate to seal. The liners will still dance a bit and mark up the top of the block but you can just have the top machined flat and get a little thicker plate instead of worrying about cutting counterbores, doing shims or putting in Z sleeves. The spacer plate engines did away with the counterbores and the cracking counterbore problem. The other issue was they seemed to allow the liners to vibrate a little more than the spacer plate engine which was evidenced by the liner pitting I've seen in every counterbored D342 engine I've pulled down. kshansen says the counterbores can crack in the corners causing compression gas to leak into the cooling system. ![]() If they weren't in spec you could put shims in a low counterbore to maybe get a liner up enough to be in spec with the liners next to it. The counterbored engines could be a pain to rebuild because all the counterbores were supposed to be the same so the liner heights would be close or the same. It's just basically the D8H engine with a little more horsepower. But when are all things equal?Įarly D8K engines were counterbored. There are other versions of this design but I'll leave those some one else.īasic point is a "spacer plate engine" "should" be a better one all things being equal. The basic theory would be that when the counter bores are cut into the top of the block that causes what would be called a stress riser, Google that one, and makes cracks likely.Ĭat is the only one that I have seen use this design but I'm sure someone else has. Now if you have a spacer plate engine the top of the block is flat, not counter bored, instead a plate of steel slightly thinner than the flange on the liner is used with all the holes for the head bolts, water and oil passages and the liners is installed between the top of the block and the head gasket. Then the head gasket holds down on the top of the liner when head bolts are tightened. On older Cats and most other engine with wet sleeves the top of the block is bored out a few thousands of an inch less that the thickness of the liner flange. If you are familiar with any "wet sleeve" engines the sleeve has a thick flange at the top, maybe 3/8 thick. Cmarks answer is probably all you need to know but if you have some time to waste here are my additions ![]()
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