I have a intake valve that seems to have some gunk under the valve which is causing a low compression (50/80). I ran it for about 10 hours and got the same thing. However, I could never get the temps very high as it was winter in MN. I'm thinking of trying to either stake or lap the valve to try to get this out.
When staking the valve, should the valve be closed? I'm a little worried about hitting it too hard. How hard do I need to smack it? (I know to use a block of wood and mallet)
I've read a little bit about trying to lap the valve while on the engine. Are you able to get grinding compound on the valve through the spark plug hole, or can you go up through the intake pipe? How do you get the grinding compound back off completely when your done?
Can anyone tell if this looks like carbon or lead buildup? How hot do you need to get the cylinder to burn each off?
https://lh3.googleusercontent.com/b...U3woE47U5PCXBMSF3lL7Pe-gkQteXHIw=w640-h480-no
Thanks
Vince
RV-7
IO-360
When staking the valve, should the valve be closed? I'm a little worried about hitting it too hard. How hard do I need to smack it? (I know to use a block of wood and mallet)
I've read a little bit about trying to lap the valve while on the engine. Are you able to get grinding compound on the valve through the spark plug hole, or can you go up through the intake pipe? How do you get the grinding compound back off completely when your done?
Can anyone tell if this looks like carbon or lead buildup? How hot do you need to get the cylinder to burn each off?
https://lh3.googleusercontent.com/b...U3woE47U5PCXBMSF3lL7Pe-gkQteXHIw=w640-h480-no
Thanks
Vince
RV-7
IO-360