matt k
05-29-2011, 01:42 PM
1987 comp. Put it back in the water this year, and the temp climbed up to about 200 degrees. I pulled it out, replaced the impeller (old one looked fine) and the thermostat (with a 143* tstat from skidim). Started it up on the trailer, at idle the temp steadily climbed up to 200ish again. Shut it down, tested both the old and new tstats in a pot of water on the stove, they both appear to work correctly. Tried again, 200. Tried running it without the tstat in place, and the temp stays down in the 130* range (inlet water from the bucket is probably around 50*).
So basically, if I put the thermostat in, it overheats. if i leave it out, it doesn't. But both the new and old thermostat appear to work fine.
I pulled the belts and checked the circulation pump for wobble and end play, and it feels fine.
Any ideas? I'll replace the circulation pump if I have to, but I'd rather not drop $120 if that's not the problem...
Is it possible for air to get into the cooling system, and need to be bled out, like in a normal pressurized car coolant loop? I sort of assumed not, since the system isn't closed...
edit: on the trailer, i had all the belts off and spun the circulator pump by hand, it feels fine. A couple bubbles came out of the thermostat hole (had that open at the time). I put it back together, and now it seems to hold steady at 160*, where it's supposed to (at roughly idle speed, anyway). also, i seem to get a lot more cooling water flow through the right exhaust than the left. possibly related? I can't figure it out.
So basically, if I put the thermostat in, it overheats. if i leave it out, it doesn't. But both the new and old thermostat appear to work fine.
I pulled the belts and checked the circulation pump for wobble and end play, and it feels fine.
Any ideas? I'll replace the circulation pump if I have to, but I'd rather not drop $120 if that's not the problem...
Is it possible for air to get into the cooling system, and need to be bled out, like in a normal pressurized car coolant loop? I sort of assumed not, since the system isn't closed...
edit: on the trailer, i had all the belts off and spun the circulator pump by hand, it feels fine. A couple bubbles came out of the thermostat hole (had that open at the time). I put it back together, and now it seems to hold steady at 160*, where it's supposed to (at roughly idle speed, anyway). also, i seem to get a lot more cooling water flow through the right exhaust than the left. possibly related? I can't figure it out.