Broken Valve Spring

[eschaider]

Originally Posted by splenderleith

I was able to remove the intake and all 10 of the head bolts. I can definitely see a bent valve from the intake port.

I haven’t figured out how to get the head loose. Any ideas?

This picture is exactly what Gary described / predicted in post #15.


Ed

[undy]

Originally Posted by eschaider

This picture is exactly what Gary described / predicted in post #15.


Ed

...or what I said in post #6.

[HTM101]

The damage can sometimes be extensive. In 2008, #2 intake valve in my 427 dropped because both springs had broken. The piston split the cylinder wall.

When the failure occurred, and before I dismantled the engine, I knew things were bad. We were stopped on the side of the road with antifreeze running out of both side pipes.

[splenderleith]

I was unsuccessful in removing the head last night. I believe the air from the compression is plenty to break the seal, but the intake side seems to have a slightly weaker bond, which leads to a gap on the intake side. It seems that the air is then able to escape before it breaks the exhaust side loose.

What I think I may try this evening is to hook up the compressed air and pressurize the first cylinder to see if I can get enough space to get some plastic shims in. I believe if I can break the head gasket on the exhaust side free, I can probably pull it off.

If that fails, I will probably have to find a way to remove the studs. I think that will involve some thin jam nuts, with the same thread as the studs.

I will report back after I try option 1.

[eschaider]

Originally Posted by HTM101

The damage can sometimes be extensive. In 2008, #2 intake valve in my 427 dropped because both springs had broken. The piston split the cylinder wall.

When the failure occurred, and before I dismantled the engine, I knew things were bad. We were stopped on the side of the road with antifreeze running out of both side pipes.

Very impressive job there HTM101!


Ed

[HighPlainsDrifter]

The engine needs to be pulled and at least one piston replaced if it has wrecked the cylinder wall a sleeve can be installed. the connecting rod needs to be checked as it may be bent also.
Good Luck.