Posted by the Unforgiven on July 16, 2013 at 11:35:42 from (66.146.251.119):
Still don't have a handle on this pump motor. Temp switch/gauge sits at 170 for a while, then swings wildly a couple times and hits the top peg, killing the engine, all in about 5 seconds. Still acts like it's got an air pocket around the sender that moves and slugs the sender with hot water, but the engine isn't that hot. Start it back up, throw the clutch in, pull the throttle back and the temp comes right back down. Bleeding the t-stat and sender before and after it's running. Winding it up to around 3K to sweep the water jacket. Water pump is working. Switched it to vapor and took the hoses off off the vaporizer. Crawled all over it with the heat gun and nothing is out of line. Took .006 off of the heads to clean them up, pressure checked fine, the gaskets looked fine, could not ask for a cleaner water jacket. No joy. Just a couple of times I have got it to stay running, the gauge is all over the dial, up and down wildly, but it didn't shut down, and calms down after a couple hours and works right, well, until you have to shut it down and restart, then I'm back to the same angry rodeo! About all that is left is a water pump that is sucking air or maybe cavitating at an oddly low rpm or a cracked block. Fighting this engine for three days to do a 20 hour pass is really starting to put a layer of frost on my donkey. Thanks for all the suggestion the first time around, I have been hoping for a happy ending to tell you guys about, but I'll have to settle for an update.
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