454 running hot

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454 running hot

Home > Discussion Forum > Mechanic's Corner - Engines

email thomas d (the rv rookie)

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All Messages in Thread	Author	Date
454 running hot	thomas d (the rv rookie)	10-4-06
I have a 454 in my 91 fleetfood rv and when i start it up it runs fine, but as it warms up the fan seems to slow down and it gets even hotter, even up to 240, i notice at this time the coolant overflow resivior starts to concave. we want to replace the clutch fan, can we put in a regular fan that always runs full blast? is this smart? is this the best thing to do? any advice when embarking on this procedure? appreciate any and all help guys. thomas
Re: 454 running hot	Bubba The Bus Tech	10-5-06
I think concave meanse to curve in, if the overflow i sucking in the first thing to do is find out why the system is sucking in coolant, the system will do this if it is low or air locked. The unit will over heat unill the base problem is repaired. The fan clutch is saving you a ton going down the road, probably a mile to the gallon at speed. It will not cut in unless the fan itself gets hot, so does the air coming off the fan get hot, with engine running 240 the air coming off the fan/rad shoiulld be so hot as to be uncomfortable, more so since the fan is not running fast. So no hot air means no fast fan, No hot air means no coolant circulation, colapsing over flow tanks mean low coolant or air lock or bubble in system. also means vent plugged on over flow. In cases like this I like to disconect a coolant line from the block or intake, usualy feeding the heating system and top up system thru cap until I see coolant, reconect and test run, usualy if the air lock gets small enough using this process it will self purge. Also replace rad cap and fix over flow bottle.
Re: 454 running hot	Don_a	7-8-07
I had a 83 P30 chassis with that problem. I burnt up an engine before I finally decided to purchase a new radiator. I went to the local small town radiator shop, the guy had been in the same business for 40 years and knew just what to oder for me. It was under $300. (Mine was so corroded it could not be "rodded".) The no-slip fan clutch should not hurt you unless you dislike riding on top the sound of of a jet engine. It's hard to talk to the wife but you can always buy a MP3 player with sound blocking headphones for the ride and catch up on gossip at the next campsight. :-) My personal opinion is that if you can't make a heavy duty slip clutch work, you have other problems. Otherwise, look for a "truck fan clutch" once you get the radiator fixed. You will burn up a "normal" 454 fan clutch realy quick. The truck clutch will last longer. I am now on my second "truck fan clutch" (heavy duty and larger than regular) as the first "truck fan clutch" went out too (new defective but I couldn't get back to the parts house where I bought it to exchange it). My latest truck clutch has been working for about 5 years. By the way the "normal" (not heavy duty) 454 fan clutches last about 500 miles on my engine ;-(