Timing belt and valves replaced, bad lifters?

[nater321a4]

Hello everyone,

I have a 1999 Audi A4 1.8T AEB 168K. My girlfriend was driving the car and the crank bolt came loose and wrecked 10 valves. I have owned the car for 40k and never touched the belt myself as it was replaced before I purchased it but whoever did the job loosened the crank bolt and didn't replace or torque correctly. I brought the head to a shop and had it checked over and the valves replaced. I put the car all back together and had a bad misfire on cylinder 4. I did a leak down test and found out I had an intake leak on cylinder 4. I pulled the head and saw one of the intake valves was smashed. Timing was dead on and I waited 30 minutes before starting the motor after messing with the cams. I made sure to wait 30 minutes before turning the car over per my Bentley manual, as if I could get the car all back together and fired over in 30 minutes anyways. Timing was perfect for both the timing belt and cam chain. After seeing the bent valve I took it all apart and pulled the head. I brought it back to the shop and was told that some of my lifters are bad.

My question is with only one valve being smashed does the lifters being bad sound right? I never had any excessive chatter when the car was running, no excessive sludge built up that I can see and the head looked pretty good when I first pulled it after all the valves got bent. I got the head back from the shop and didn't install the cams for a week or so. I made sure to wait 30 minutes before turning the car over so I didn't risk the lifters not adjusting right and the valves meeting the pistons. Any tips or suggestions, anything I can do to figure out if the lifters are truly bad and need to be replaced? Would a bad lifter cause the valve to meet the piston?

Thanks in advance!

[Nollywood]

An over-extended, jammed lifter would most certainly send the relevant valve into the piston crown. It would cause excessive valve lift. An oil pump pressure relief valve stuck closed can also cause excessive oil pressure, which can also force the lifter/s to lock. I would check oil pressure, and oil return from the cylinder head.

I would replace the lifters as a set.

[V70R]

Jammed lifter from valve to piston contact. Any time a hydraulic lifter hits the piston it cannot be reused when reassembled. Do you know all of which lifters were damaged? I would replace them all just to be cautious, especially if you plan to keep the car and drive it.