OSDart
Well-Known Member
First, a little background. I've been mechanic/building for 50+ years and never run across this. New 470 bbm. New Be Cool radiator, New 13psi cap, Be Cool overflow. New 180° t-stat, all new hoses.
Compression test good. Leak-down test good. Checked for combustion fumes in radiator. None. All cylinders free of moisture. No water in oil.
Engine was run on test stand. Several times. No issues.
Now to the problem.
I drove the car two weeks ago to a car show. Ran great without any issues. Two days later I was doing a once-over and there was still pressure on the cooling system. Hoses were still hard. I eased the cap off and checked water level. Was fine.
Saturday I moved it outta the shop, left it ideling, while I moved a few things around. I checked it last night and there was still pressure on the cooling system.
Never run across a cooling system holding pressure for days. Usually the pressure drops when temperature drops.
Any ideas?
Compression test good. Leak-down test good. Checked for combustion fumes in radiator. None. All cylinders free of moisture. No water in oil.
Engine was run on test stand. Several times. No issues.
Now to the problem.
I drove the car two weeks ago to a car show. Ran great without any issues. Two days later I was doing a once-over and there was still pressure on the cooling system. Hoses were still hard. I eased the cap off and checked water level. Was fine.
Saturday I moved it outta the shop, left it ideling, while I moved a few things around. I checked it last night and there was still pressure on the cooling system.
Never run across a cooling system holding pressure for days. Usually the pressure drops when temperature drops.
Any ideas?