Tweet
My 63, 327/340, Carter 3461 ran ok until the coolent temp was at 180 plus for 5 or 10 minutes. Afterwhich the idle would become very rough, and the coolant temp at idle would rise dramatically and approach 220+ on a 80 degree day. (The gas would also percolate and puke after shutdown (didn't smell or look pretty!).A number of things were done which lessened the severity of the problem ( metering rod springs, jets, , float level, vacuum advance -all of which were fixed with help from this board. ) But, the problem persisted. Clem Z suggested blocking the intake manifold exhaust crossover. That did it. It idles no differently when hot, no longer floods, the coolant temp does not rise above 190 even after long periods of idling, and the exhaust sound is virtually the same. So, thanks to everyone who helped me thru my baby steps during the past year, and thanks to Clem Z for the last puzzle piece (until the next puzzle anyway). Les
-
-
Re: C2 Hot Idle / Fixed At Last!
Les what did you use to block the intake crossover? -
Re: C2 Hot Idle / Fixed At Last!
Jim Clem suggested using .005 stainless steel stock, cut into two pieces 1 3/4 by 2 1/4 with the longest side bent 1/4 inch. The piece fits neatly between the two adjacent bolts, with the 1/4 outside the IM to hold it in position. I tried to insert the shims without removing the manifold but that didn't work and eventually pulled the IM.Comment
-
Re: C2 Hot Idle / Fixed At Last!
Les -
If you blocked both sides, make sure your heat riser valve is operating freely, wired open, or replaced with a spacer; if it sticks shut, the exhaust gases from the passenger side bank will have nowhere to go.Comment
-
frozen closed heat riser valve
will cause the engine to not rev over 4000 rpm because of the back pressure in the exhaust system. years ago i had a customer that the engine would not rev over 4000 rpm and after checking everything i could think of i ask if he had change anything on the engine and he said he had put on a new heat riser valve because the old on rattled. he had installed it upside down and it would not open under the exhaust pressure as it was being forced closed not openComment
Comment