Audi Q7 2007 Workshop Manual page 103

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⇒ Fig. on page 98
" Checking
" Install using piston ring clamp
" If cracking is visible on piston skirt, renew piston
" Piston and cylinder dimensions
" Checking piston projection at "TDC"
" Checking cylinder bore
8 - Piston rings
" Offset gaps by 120°
" Remove and install using piston ring clamp
" "TOP" must face towards piston crown
" Checking ring gap
" Checking ring-to-groove clearance
Oil spray jet for piston cooling
1 - Bolt, 9 Nm
2 - Oil spray jet with spray nozzle valve for piston cooling
Checking piston ring gap
–
Insert ring at right angle to cylinder wall from above and
push down into lower cylinder opening approx. 15 mm
from bottom of cylinder. To do so, use a piston without
rings.
Piston ring
Dimensions in mm
1st compression ring
2nd compression ring
Oil scraper ring
Checking ring-to-groove clearance
–
Clean groove in piston before checking clearance.
Piston ring
Dimensions in mm
1st compression ring
2nd compression ring
Oil scraper ring
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
⇒ page 100
⇒ Fig. on page 98
⇒ Fig.
⇒ Fig.
New
0.25 ... 0.38
0.70 ... 0.90
0.40 (maxi-
mum)
New
0.120 ... 0.160
0.020 ... 0.090
0.020... 0.090
4 Dismantling and assembling pistons and conrods
⇒ page 99
Wear limit
0.80
1.30
0.70
Wear limit
0.175
0.115
0.115
Audi Q7 2007 !
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