Posted by RAB on July 19, 2008 at 00:13:14 from (195.93.21.10):
In Reply to: Super C overheats posted by Dan-IA on July 18, 2008 at 22:34:23:
Over-running clutch is a safety issue for non-live pto's. A longer belt is a small price to pay to avoid an accident.
But that aside, the overheating, assuming a gas engine but most symptoms are appliccable to either gas or diesel - could be due to quite a few causes.
Leaking/blown gasket, rad blocked, block full of sediment from years gone by, thermostat, engine overload, timing, fuel mixture, water pump, w/pump drive belt, fan installed the wrong way round, rad cap (in a pressurised system), inappropriate fuel, etc(?).
Water/antifreeze loss could have been due to overfilling, but might be associated with the above.
Initially, 'seems to overheat' needs to be confirmed. Measure the temperature with a reliable device (compare to, or standardise with, boiling water).
A vinegar flush would not be apporiate unless the 'cause was appropriate to the fix'.
Can't say exactly what your problem is but it needs to be sorted before serious damage occurs.
Fill system up to the rad neck and start engine. If a continuous stream of bubbles are seen at the radiator outlet it probably means a leakage from a combustion chamber to the water jacket - head gasket or a crack are possibilities.
A cold bottom hose (when engine is hot) might mean a blockage somewhere around the circuit.
Feel the rad core when hot (stop engine and do it immediately) to see if the core is cool around the edges or one side, for instance.
Check plug colour for mixture weakness. Check timing is not retarded, Check fan belt for tension or excessive wear.
Hope this lot helps to find the cause. No point in cleaning the rad if it is clean already and the problem is a failed head gasket.... Diagnose first and 'cure the disease, not just the symptoms'.
I wouldn't be surprised if someone jumps in and suggests I don't know a lot about engines or Super C's and that it must be just one of those possibilities, but I reckon the above might help you to sort out the cause, and then take the approriate remedial course.
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