Re: Cylinder and piston wear

Posted by Tim Cole On 2014/10/1 15:34:29

Hi Ken:

Worn rings and valve guides can cause the smoking. Even with flathead motors.

External cracks on monoblock Packards are not rare. The principal issue is whether the leak is the result of a rusted block rather than damage. Sometimes weak castings cause that kind of persistent leak.

The usual diagnosis for rings is if it smokes under load it's rings. Your case sounds severe so take the valves out and check the guide clearances. You can buy ball gauges for a micrometer from McMaster-Carr.

As well, sometime rings stick and cause smoking even with good compression.

Hope this helps.