Piston Ring Measurements

M52TU 2.5L/2.8L Piston Rings

M52TU 2.5L
1st groove
End clearance	mm	0.10 - 0.30
Axial play	mm	0.020 - 0.060
2nd groove
End clearance	mm	0.20 - 0.40
Axial play	mm	0.030 - 0.065
3rd groove
End clearance	mm	0.25 - 0.50
Axial play	mm	0.020 - 0.060

M52TU 2.8L
1st groove
End clearance	mm	0.10 - 0.30
Axial clearance	mm	0.020 - 0.060
2nd groove
End clearance	mm	0.20 - 0.40
Axial play	mm	0.030 - 0.065
3rd groove (oil scraper)
End clearance	mm	0.25 - 0.50
Axial play	mm	0.020 - 0.060