Posted by J.R.
on 5/19/2012, 13:20:35, in reply to "Re: fc 4cyl and 6 cyl radiators"
71.95.18.40
x2 on testing your thermostats... even new ones.
A wholesale customer called me to say that his customer's Chev V8 was not circulating coolant with the new 180-degree Fahrenheit (brand S**** "Super-Stat") thermostat I'd sold him. Wanting to get him one that functioned properly, I "boil-tested" 10 new 'identical' thermostats, right out of their boxes: 3 were defective. One of them wouldn't open at all, even at 212 degrees! IMHO the RobertShaw brand seems to work best, but it's hard to find them anymore.
You can also check that there's no casting flash present on the pump inlet & outlet; just don't mess with the impeller-to-pump wall clearances.
J.R.
SoCal
--Previous Message--
: I would watch the temp. if running with out a
: thermosat, I have done that myself in the
: past, but never again. After I got into the
: marine repair and service end, 23+ yrs. what
: I have seen in a inboard engine, like a 4
: cyl. Gm. eng., small & big block Fords
: & chevy's, if run below aprox. 160
: degree all the time, the cyl. wall wear
: increase and some times will go egg shaped,
: even the factory's told us about this,
: Mercury & OMC. The problem is all the
: engines are set up to run at a set temp.,
: most auto's is 180-200 degrees, the marine
: eng's at 160 degree's, if they have a
: enclosed cooling system, then thay will also
: run around 180 degree's. I would get a 160
: degree thermosat and try it,also, when
: thermosat is marked 160, it will
: "start" to open at 160, it may not
: open 100% untill it gets to 170 or so, I
: have tested many to make sure they work OK.
: Another thing we would find, the water pump
: vanes would wear down, hard to see unless
: you have another pump to look at., just my
: 2-cents, good luck with it, Wayne in sunny
: Fl.
:
:
:
:
: --Previous Message--
: Hey Dan:
: Are you not running a thermostat at all with
: no problems?
: Interesting, I had always understood that
: the thermostat not only keeps the engine hot
: enough but also slows down the coolant flow
: so it has time to cool as it passes through
: the radiator.
: Too fast a coolant flow can also cause the
: engine to overheat.
: Will R
:
: --Previous Message--
: That is good info, so I must have the right
: radiator. Finally found my manual, the 6
: cylinder is 11 quats vs 10 for the 150.
: That extra capacity could be in the engine.
:
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