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58Custom
Jedi Warrior
Offline
NOTE: Pix below is NOT my head.
Engine is a 1275.
I had head sealing problems so I decided to lap the valves in an extra head I have and swap the heads with a new gasket. Just a quick swap so I can get some driving in now that the temps will be cooling down. What was happening was the cooling system would get pressurized under heavy loads and it would blow the coolant out. No water in oil.
I pulled the head this evening and when I had the two heads side by side I noticed something about the brass plug in the center of the deck surface. On the original head the plug was recessed about a 1/6th of an inch. On the swap head it was recessed only slightly. There were clear signs that cylinder pressure was leaking across the recess. The recess area intrudes on the cylinder sealing rings on the 1275 as you guys know. The entire center area between the cylinders and the head gasket was very dark. I believe this is my problem area.
Shouldn't the brass plug be flush to the surface? Why would it be recessed? Seen this before? Any way to put it back?
The pix below, which I found with Google, clearly shows the center brass plug.
Engine is a 1275.
I had head sealing problems so I decided to lap the valves in an extra head I have and swap the heads with a new gasket. Just a quick swap so I can get some driving in now that the temps will be cooling down. What was happening was the cooling system would get pressurized under heavy loads and it would blow the coolant out. No water in oil.
I pulled the head this evening and when I had the two heads side by side I noticed something about the brass plug in the center of the deck surface. On the original head the plug was recessed about a 1/6th of an inch. On the swap head it was recessed only slightly. There were clear signs that cylinder pressure was leaking across the recess. The recess area intrudes on the cylinder sealing rings on the 1275 as you guys know. The entire center area between the cylinders and the head gasket was very dark. I believe this is my problem area.
Shouldn't the brass plug be flush to the surface? Why would it be recessed? Seen this before? Any way to put it back?
The pix below, which I found with Google, clearly shows the center brass plug.
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