timing jumped, valves hit pistons, etc. (Crank bolt got loose)

[Aphix]

Somehow my crank bolt started backing out that allowed the crank timing belt pulley to back off the crank and disengage with the key on crank. Thus while driving the timing slipped and all valves hit pistons. My questions is how bad is acceptable for dents in pistons from valves kissing them? I will post up some pics of the pistons in a bit.

 

[Aphix]

Here are pics of the horror..

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[hubz91talontsi]

Looks borderline to me. Id run them

 

[95eclipser]

if it wasn't for the blown up picture i would even have noticed them.. i think you should be fine but i would get a second opinion.. glwe

 

[92AWDHX40]

Youre fine ive seen many of those in my dsms, over the years, no harm.

 

[Littlebeeper]

i had some jagged metal pieces on the reliefs from when my valves met the piston. i tapped them down a bit with a small hammer and they gave me no problems. try not to have sharp edges that can heat up and cause detonation.

 

[mosul210]

I agree with the others you should be fine. On another topic since you already have the head off the car, I would go all the way and re-hone the cylinders and install new piston rings. I regret not doing this on my GSX the last time I took the head off to replace an exhaust valve and valve stem seals.

 

[crimsondragon]

Clean the top of the pistons. Any raised edges from the contact should be filed down smoothly.

 

[HIGHPSI4]

I take a Dremel tool and a rotory burr and smooth them down.

 

[TOONAH]

Do you have any bent valves?

 

[Aphix]

every single valve bent...

 

[sbengineering]

File down any sharp edges on the valve reliefs, sand paper the valve relief contour back in, wire wheel the carbon of off the top of the pistons and you will be good to go.

 

[BogusSVO]

You may want to drop the oil pan and pop the pistons out, and check to make sure the rings still spin freely in the ring lands.
Better to know than guess or assume.

I hope you did not pinch a ring.