Audi Q7 2007 Workshop Manual

Audi Q7 2007 !
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
4 Dismantling and assembling pistons and conrods
97
6
" Checking ⇒ Fig. on page 98
" Install using piston ring clamp
" If cracking is visible on piston skirt, renew piston
" Piston and cylinder dimensions ⇒ page 100
" Checking piston projection at “TDC” ⇒ page 99
" Checking cylinder bore ⇒ Fig. on page 98
8 - Piston rings
" Offset gaps by 120°
" Remove and install using piston ring clamp
" “TOP” must face towards piston crown
" Checking ring gap ⇒ Fig.
" Checking ring-to-groove clearance ⇒ Fig.
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.
Checking ring-to-groove clearance
– Clean groove in piston before checking clearance.
Piston ring
Dimensions in mm
New Wear limit
1st compression ring 0.25 … 0.38 0.80
2nd compression ring 0.70 … 0.90 1.30
Oil scraper ring 0.40 (maxi-
mum)
0.70
Piston ring
Dimensions in mm
New Wear limit
1st compression ring 0.120 … 0.160 0.175
2nd compression ring 0.020 … 0.090 0.115
Oil scraper ring 0.020… 0.090 0.115
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Audi Q7 2007 Specifications

General

Brand	Audi
Model	Q7 2007
Category	Automobile
Language	English