Wife's S-10 Jimmy started doing that after a few years and after the 100,000 mile mark. Didn't mater that the water pump was changed, the rad flow verified. Tried four different brands of thermostats that were correctly installed. Even drilled a vent hole in them if there wasn't already a vent. Each stat over heated the engine then suddenly the engine would run too cool at light loads and too hot at high loads. Every stat removed was found stuck about 1/3 open. Even after an engine rebuild when it was running on 5 cylinders due to a stuck lifter after an Quick Lube oil change. The engine kept over heating with a new stat . And the stat would later be found stuck 1/3 open. Still did it after the 2nd rebuild after the rebuilder used the wrong balancer shaft bearings. All block, head and pump coolant passages were verified open. I was about to just pull the stat and run an electric cooling fan set to start at 210F. However it cracked a piston and vehicle was scraped. Hence my belief that getting rid of an old worn machine and purchasing new or newer is cheaper in the long run. If indefinite repairs were cheaper. Trucking companies would still be using 1970's and 80's vintage tractors.
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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
... [Read Article]
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