And Later Cars) - BMW 1989-1995 525i Service Manual

113-12
CYLIND ER H EAD R EMOVAL AND INSTALLATION
Fig . 28. Protractor and pointer being used to t,ghten boils to specified
torque angle.
Tightening Torques
• Cylinder head to cylinder block
(M50 and M50 TU engines )
stage 1 30 Nm (22 tt-lb)
stage 2 +90·
stage 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +90"
• Cylinder head to lower timing
chain cover 10 Nm (89 in-lb)
8. Mount the primary chain sprocket to the primary chain
so that the arrow on the sprocket faces up. Mount the
sprocket to the exhaust camshaft such that the tapped
holes in the camshaft are on the left side of the elongat-
ed holes in the sprocket. See Fig. 29.
9. Install the timing chain guide and the secondary chain
tensioner. Tighten the mounting bolls.
10. On 1991 and 1992 cars, install the cylinder identifica-
tion trigger plate to the front of the intake camshaft.
11 . Install as an assembly. the secondary chain sprockets
and chain so that the arrow(s) on the sprocket(s) are
pointing up. Center the mounting holes in the sprockets
to the bolt holes in the camshafts. See Fig. 30 . On 1993
and later cars, install thrust washers to the sprockets.
CAUTlON -
On 1993 and later cars. mount the intake ca m-
shaft sprocket so that the collar side of the sprock -
et faces the camshaft.
REMOVING AND INS TALLING CYLINDER HEAD
Fig. 29. Primary chain sprocket correctly allgnoe] 1 0 exhaust cam -
shaft. Camshaft holes sbould be on left most side 0 sprocket
holes,
Fig. 30. Secondary chain sprockets and chain being Installed on non -
VANOS engine. Attach sprockets with arrows pointing up and
elongated holes centered ,
12. Install and tighten the sprocket mounting bolts and/or
nuts finger tight only.
13. On 1993 and later cars, tighten the intake camshaft
sprocket mounting nuts.