It also depends on where the vacuum line is hooked. Some are hooked directly to intake manifold, most are above the throttle shaft. The larger IH v8 gasoline engines hooked into intake manifold. You had to unhook them to time the engine with a light. With it unhooked and timed correctly the engine would labor, then you hooked it back up and it ran free. I remember a service station in town timed one with it hooked and that made timing about 14 degrees late. Was an easy fix to get the power back up for that customer . Other engines hooked that way also but this one always stuck in my mind.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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