exhaust manifolds

[tim sparks]

guys why would my exhaust manifolds be turning frost color i think they have slight leaks would that cause it thanks for any input

[Tony and Ginny 429]

Let me know what you find
Regards

[tim sparks]

thanks tony will pull plugs asap dont think engine is running ho t yust put water pump and thermstat in jan will check all an d get back to yous thanks again

[Tony and Ginny 429]

Is the engine running hotter than it should be ??

Pull a few plugs and examine them ,to see there color

They s/b the color of a brown paper bag

If they are more on the  white side , you are running hot and could have developed a vacuum leak

If a 64 ,you are more prone to vacuum leeks due to the comfort control system with a lot of vacuum hoses under the dash

The white on the intake is the heat passage to warm the carb ,and hard to keep paint on that surface for that reason

My best quess is you are running hotter than you s/b for some reason

Could be a vacuum problem or a cooling system problem--bad water pump or need antifreeze-your termistate  may have  gone bad (first best quess ) if hot running

Something has changed if this just started to happen

[tim sparks]

looked at more closely on rt intake one of the ports is also white and top only of rt manifold is all whit e along with top lft ex. manifold is all white someone mentioned it cld be hot plugs

[Jason Edge]

Kinda odd that the manifolds have suddenly frosted (assume a whitish color) within the month.  I'm not sure it will matter but where are the leaks? Are they cracks in the physical manifold are where the tail pipe/heat riser attaches to manifold, or where the manifold attaches to cylinder head?  You can often take a pipe up to your ear and pinpoint where the leak is coming from.  They also sale auto stethoscopes pretty cheap at places like Harbor Freight around where I live.

[tim sparks]

jason have had car 24 years dont beleive they have been off it is both of them both fully frosted rt one newly leaking lft ono been leaking for a month no paint on them did paint engine blue no on manifolds not sure how long theve been frosted maybe a month

[Jason Edge]

Have you recently painted or reinstalled the manifolds or is this something that just appeared on manifolds that had been on the engine for many years? Is it both manifolds or just one? Is it in one spot or all over?  Can you hear or feel a leak?  Painted manifolds will burn the paint off if it is not ultra high temp paints or powder coating design for the fire hot blast of the exhaust gases. I've had cracked and leaking RH manifold on a driver car I had a while back and don't remember it being frost color....but I could hear and feel the leak.