455 gets to 200 to 250 degrees at at idle?
#1
455 gets to 200 to 250 degrees at at idle?
So I have a 1970 olds with some year old gas. It has a fan shroud and clutch fan and when I drive it runs around 160 degrees. When I idle however it it goes up to 200 to 250 degrees unless I give it gas then it will cool down. Anyone have any suggestions?
#2
Are you sure that you don't have air in the system? Check the clutch. Spin it. If it stops with only a few turns it's fine. If it keeps spinning freely change it. Do you have air, how many blades on the fan?
Last edited by 442much; July 19th, 2011 at 07:25 PM.
#5
#6
When it starts running above 200, pop the hood and stand to the side and poke your head just under the hood. If your hair ain't getting blown all around and you do not hear the roar of air being blown, it is time for a new clutch.
Mine did not spin freely when stopped but it never engaged either.
#8
...true that
About 190ish at the clutch.
When it starts running above 200, pop the hood and stand to the side and poke your head just under the hood. If your hair ain't getting blown all around and you do not hear the roar of air being blown, it is time for a new clutch.
Mine did not spin freely when stopped but it never engaged either.
When it starts running above 200, pop the hood and stand to the side and poke your head just under the hood. If your hair ain't getting blown all around and you do not hear the roar of air being blown, it is time for a new clutch.
Mine did not spin freely when stopped but it never engaged either.
#10
I think it might be a combination of thermostat and fan clutch. The top hose of the radiator is really hot while the lower one is warm but not burning which makes me think the thermostat is not opening to let more water flow. Also the fan clutch doesn't spin very freely when the engine is cool but the new one doesn't seem to either. I will try the thermostat first when I get to work on it tomorrow.
Thanks again for all the help.
Thanks again for all the help.
#14
...cool
i think the flow direction is from the motor past the pump, thru the thermo., out the upper hose, into the top of the rad., down the rad., into the lower hose, back to the pump inlet. is this right? sounds good to me. so if the upper hose is way hot, and mine is at operating temp., and by hot i mean you can't rest 'yer arm on it while setting the timing, ouch! the lower one should be alot cooler, that means the radiator isn't plugged and your probably getting enough airflow. i was told if you grab the fan blade and spin it by hand and it rotates a few times around and seems to have some drag on it then the clutch is working, it should also appear to sort of have lag. i also have the seven blade fan and a optional deep fan shroud, and a four-core rad. plus the air seal kit from a '74 on mine. i think the rad. uses a 15# cap too. a 40/60% mix may help, i run a 50/50 at least, probably 60/40, the rebuild guy said olds. 455's have a nasty habit of cracking the blocks by the motor mounts if left outside in cold climates. mine was bored .020" with 9.5 to 1 forged pistons and a cam with .454"/.485" lift, 205 degrs. dur./ 112 degr. C/L, seems to work fine. fun to drive too. they make a water pump that has an enclosed impeller, this may or may not help, that rad. can only dissapate so much heat.
Last edited by blueRAYwhale; July 22nd, 2011 at 01:21 PM. Reason: ...added things
#15
Thanks guys it looks like my issues are from the carb once I leaned it out it is running a lot cooler. Now I have another problem though. Once the engine warms up it seems to flooding or not getting enough gas it will start to sputter then die. If I half throttle it will run but when I floor it seems to cut out. If I let it sitand start it again it seems to run fine if going freeway speeds but once I start driving im traffic it will start the stuttering again.
#17
...cars
Thanks guys it looks like my issues are from the carb once I leaned it out it is running a lot cooler. Now I have another problem though. Once the engine warms up it seems to flooding or not getting enough gas it will start to sputter then die. If I half throttle it will run but when I floor it seems to cut out. If I let it sitand start it again it seems to run fine if going freeway speeds but once I start driving im traffic it will start the stuttering again.
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