Piston And Cylinder Dimensions; Checking Radial Clearance Of Conrod Bearings - Audi Q7 2007 Workshop Manual

Audi Q7 2007 !
6
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
Procedure
–
Set up dial gauge -VAS 6079- with -VW 382/7- and
-VW 385/17-.
–
Measure piston projection at two points -1- for each pis-
ton.
Piston projection above top
surface of cylinder block
0.39 ... 0.49 mm
0.49 ... 0.54 mm
0.54 ... 0.65 mm
Cylinder head gasket identification
1 - Holes
2 - Part No.
Note
The gaskets for the left and right cylinder heads have different
shapes and cannot be interchanged.
4.3

Piston and cylinder dimensions

Honing dimension
(in mm)
Basic dimension 82.939 ... 82.951
Repair oversize 82.979 ... 82.991
•
1) Dimensions not including graphite coating (thickness
0.02 mm). The graphite coating will wear down in serv-
ice.
4.4 Checking radial clearance of conrod bear-
ings
Special tools and workshop equipment required
Plastigage
♦
Procedure
–
Remove conrod bearing cap. Clean bearing cap and bearing
journal.
–
Place a length of Plastigage corresponding to the width of
the bearing on the bearing journal or bearing shell.
–
Fit conrod bearing cap and tighten to 30 Nm. Do not rotate
crankshaft.
–
Remove conrod bearing cap once more.
–
Compare width of Plastigage with measurement scale:
100
Repair Group 13 – Crankshaft group
更多资料请访问深度汽车论坛 http://shenduauto.com/ 客服QQ：1398556747 电话：18218750259
Identification
(No. of holes)
Piston ∅ Cylinder bore ∅
83.006 ... 83.014
1)
83.046 ... 83.054
1)
1
2
3