Grinding noise, coolant leak, sudden death, and now won't start

[abscate]

Head off and valve replacement is about 20 hours of Labour. Document where you lost compression so you remember which ones to replace! I think it’s only exhaust which contact, someone confirm please.

[befarrer]

Remove the spark pliugs too, then when you are turning the crank over you dont have to worry about compression. Any resistance would be valves to piston, back crank off a bit, turn cams ahead, keep going until allignment marks are alligned. Dont force anything as its likely valve to piston contact.