Hi Alan

That the glow plug glows doesn't mean that the glow plug is in good condition...

The glow plugs aren't good anymore when things like the following occur:

1. Carbon buildup
2. Distorted filament
3. Filament looses his bright (when cold, the platinum filament is not shiny)
3. The filament is melted and take another shape...

By the way...from the pictures I can't see much...

About the scratches....if the engines holds compression...it's ok....I would say that if the engine runs at all, no worries... I'm sure that your problem is not related to the piston/sleeve fit....

Make sure you assemble the liner and the piston in the same way they were...

Saludos,

Jorge</p>