Cully's spare Gti6 engine

[cully]

the head is saved!

ok
to check the head for true
sheet of glass on a flat surface, coat the glass in engineers blue which is a dyed grease,
now rub the head in a figure of eight motion on the glass and blue,
role head over and the high spots will pick up the blue on the head the unmarked areas are low points,
my head was almost all covered,
so i decided to "lap" the head instead of haveing it skimmed as the head was at its maximum cut

to lap the head is the same principle as the engineers blue method but with fine grinding paste,

coat glass with fine grinding/lapping compound

   

place head on glass and rub in the figure 8 motion

   

perodicly check buy turning head over you are now looking for a unifom grey finish
this then means you have taken enough meterial off to flaten the high spots

   


you can recheck this with the engineers blue but you can see the finish easy when you clean the face with WD40 it looks clean and grey

remember you need to clean the head well as you have used gringing compound
you dont want this in the engine

so now i have 16 Valves to clean and to lap in should take me a while