I installed tensioner without removing that metal ring around the piston and it did not tension the chain. I heard chain slapping like there is no tension. I removed it and took off that metal ring and piston came out further. Reinstalled tensioner and slapping went away. I guess that ring did not let piston to travel out the housing when oil pressure was applied. The problem now is that oil leaks around tensioner like a sip. Shut the motor and will get back to it tomorrow after work. I can't see around the tesioner but guess I need new seal.

__________________
1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod