Valve guide moved

Phillybo

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Sep 5, 2025
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if the head has not been off, do a visual inspection with a bore scope on the piston. You may find that the pushrod was bent when the piston and the valve met. That can be because the piston cracked and broke into a top and bottom, or a valve hung open. The leak can be either the hole in the piston, cracked piston or a broken guide and bent valve where air is leaking past the guide. Usually that will also show up in the intake or the exhaust.
I don’t have a scope.It did sound like some air movement around the valves also But mostly out of the dipstick. The plugs got slightly oil running it just for a couple minutes so I’m guess rings or piston.
 

slomo

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the only real way to make it right long term is a new cylinder head.
Totally agree.
Yes there are ways to “bush fix” it, but not recommended.
Why, because that Band-Aid repair will not last.

People have $1400.00 cell phones and skimp out on mower repairs. Probably have $150,000 worth of cars "laying" on the driveway......... I don't get it.
 

slomo

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Valve lash was VERY loose so I may have gotten lucky and just bent a push rod.
No talk about the cooling fins. All hey let's hammer down the valve guide. What about what caused this to happen in the first place?
 
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