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Overheating-Bounder

Home > Discussion Forum > Mechanic's Corner - Engines

Email Author email Randy Green  Reply to Message reply to message  Post New Message post new message      search forums
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Overheating-Bounder Randy Green 7-1-01  
We bought an 1988 34 foot P-30 that had been sitting for 2 years with a 454 California pollution (twin air pumps) no catalitic converters. Leaving CA, over heating was a problem (boiling). I removed the thermastat, refilled the water and drove to TX. The factory gage was broken. I installed a new S/W electric gage. It said the water temp was 240 degrees at idle. So I changed to a S/W mechanical gage. It read the same. I then tested the water and found there was exhaust fumes in the water. So I then replaced the head gaskets and new thermastat 105 degrees; no relief. the next thing I did I had a new high flow core installed in my radiator; still no relief. So last but not least I installed a new water pump and fan clutch; still running about 240 degrees. So I drained the 50/50 mix and refilled with water; now it seems to run about 225-230 degrees. I am still not happy with this temp. I have owned 454's all my life and have never had this kind of problem. Also I left the a/c condenser/oil cooler out. But I installed a auxillary oil cooler and a auxillary trans cooler. This motorhome came with twin electric fans that arm a 217 degrees and go off at 230 degrees. I don't really know what else to do, short of removing the air pumps and related items. I thought there might have been an exhaust blockage and I went ahead and changed the mufflers. Does anyone have any suggestion about this major problem? We have yet to enjoy the motorhome since we bought it and would like to use it soon. Thanks Randy
Re: overheating-Bounder Kent 7-2-01  
We bought an 1988 34 foot P-30 that had been sitting for 2 years with a 454 California pollution (twin air pumps) no catalitic converters. Leaving CA, over
heating was a problem (boiling). I removed the thermastat, refilled the water and drove to TX. The factory gage was broken. I installed a new S/W electric gage. It said the water temp was 240 degrees at idle. So I changed to a S/W mechanical gage. It read the same. I then tested the water and found there was exhaust fumes in the water. So I then replaced the head gaskets and new thermastat 105 degrees; no relief. the next thing I did I had a new high flow core installed in my radiator; still no relief. So last but not least I installed a new water pump and fan clutch; still running about 240 degrees. So I drained the 50/50 mix and refilled with water; now it seems to run about 225-230 degrees. I am still not happy with this temp. I have owned 454's all my life and have never had this kind of problem. Also I left the a/c condenser/oil cooler out. But I installed a auxillary oil cooler and a auxillary trans cooler. This motorhome came with twin electric fans that arm a 217 degrees and go off at 230 degrees. I don't really know what else to do, short of removing the air pumps and related items. I thought there might have been an exhaust blockage and I went ahead and changed the mufflers. Does anyone have any suggestion about this major problem? We have yet to enjoy the motorhome since we bought it and would like to use it soon. Thanks Randy

After the rig had set 2 years, I'd sure look at the centrifugal advance in the distributor, or just throw an advance type timing light on it to check both the vacuum and centrifugal advances, seems you've done the most obvious things. They won't run much hotter with a blown vacuum advance diaphragm, but they sure will with the centrifugal weights frozen in the initial timing position.
Re: overheating-Bounder Kent 7-2-01  
We bought an 1988 34 foot P-30 that had been sitting for 2 years with a 454 California pollution (twin air pumps) no catalitic converters. Leaving CA, over
heating was a problem (boiling). I removed the thermastat, refilled the water and drove to TX. The factory gage was broken. I installed a new S/W electric gage. It said the water temp was 240 degrees at idle. So I changed to a S/W mechanical gage. It read the same. I then tested the water and found there was exhaust fumes in the water. So I then replaced the head gaskets and new thermastat 105 degrees; no relief. the next thing I did I had a new high flow core installed in my radiator; still no relief. So last but not least I installed a new water pump and fan clutch; still running about 240 degrees. So I drained the 50/50 mix and refilled with water; now it seems to run about 225-230 degrees. I am still not happy with this temp. I have owned 454's all my life and have never had this kind of problem. Also I left the a/c condenser/oil cooler out. But I installed a auxillary oil cooler and a auxillary trans cooler. This motorhome came with twin electric fans that arm a 217 degrees and go off at 230 degrees. I don't really know what else to do, short of removing the air pumps and related items. I thought there might have been an exhaust blockage and I went ahead and changed the mufflers. Does anyone have any suggestion about this major problem? We have yet to enjoy the motorhome since we bought it and would like to use it soon. Thanks Randy

After the rig had set 2 years, I'd sure look at the centrifugal advance in the distributor, or just throw an advance type timing light on it to check both the vacuum and centrifugal advances, seems you've done the most obvious things. They won't run much hotter with a blown vacuum advance diaphragm, but they sure will with the centrifugal weights frozen in the initial timing position.
Re: overheating-Bounder Jeff Mah 1-7-03  
Randy, I read your post from Rv-coach online back in July of 2001 about your 454 over heating problem. Did you ever find a solution to the over heating? I'm combating the same symptoms on my "calif." p-30 454 also. Thanks, Jeff
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