Posted by ScottyHOMEy on September 04, 2009 at 03:53:53 from (70.105.246.43):
In Reply to: Super A running hot posted by Dave Welsh on September 03, 2009 at 17:40:22:
It might depend on what manner of 123 you have. If it was built as a 123, meaning it came out a late C, a SuperC or a Super A-1, then CNKS's point about narrower passages may be in play.
If it started life as a 113 and is now a 123 by virtue of having been overhauled and having the original 3" sleeves replaced with 3-1/8", I shouldn't think the passages are your problem.
Built up sludge at the rear of the block and head as has been mentioned is a common find. In overhauling both my tractors' motors (113 on a BN thermosiphon and 123 on a SuperC with pump), both motors had a wedge of sludge that sloped down from the top of the rear of the water jacket to bury/surround about half the sleeve on #4 and about a third of #3. Similar though not as pronounced in the head.
An easy and not to messy way to estimate whether that's the problem is to start with your coolant at the regular operating level, then drain it into gallon jugs. The system holds 13 qts. If you get too much less than that, and certainly if you get less than three gallons, then it's fair to assume you've got a lot of sludge in there (13 qts minus the quantity drained = the volume of the sludge) causing your overheating. If that's the case a cleaning like el61 described is in order. That's easier to do well if you remove the fan, and then the radiator leaving the hoses right on and unbolting the lower inlet from the block and the outlet from the head so you can see and get air and water in there to clean it out. Air works but so does some scraping with a coathanger or whatever else you can get in there, as well as a high pressure stream of water, even if it's from a garden hose nozzle.
If the block and head are clean, you might have a look at your ignition timing. If it's too far retarded, the gas will still be burning when the exhaust valves pop open and cause you to overheat. On a magneto, that could be caused by your impulse sticking, meaning the motor is firing at TDC instead of 35 degrees before. On a regular battery ignition distibutor, it could simply be misadjusted, or it could be your advance mechanism isn't working properly (a few various causes for that).
I'd check out the sludge situation first. See how much coolant you get out of it and go from there.
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