BMW 1989-1995 525i Service Manual page 127

CAMSHAFT TIM ING CHAIN
117-7
Fig . 17. Pru lary lUn ing cham tensionor (arro w ).
Fig . 18. f,mll19
chain
gUt(Je
rnoun tinq IXlIt (arro w).
To install camshaft tim ing cha in
(M50/M50TU engine)
1. Install the timing cha in to the cranksha ft sprocket and
tie it up through the cylinde r head open ing .
2. Using new gaskets. install the front cover.
• drive the timing cover dowels in just until they protrude
slightly from the sealin g surface .
• apply a small bead of silicon sealer (Three Bond 1209
or equivalen t) to the corne rs of the cylinder head
where the liming cover meets the head and the block.
• tap the cover into position to engage the dowels.
• install the moun ting bolts hand tight. including the two
outer Torx bolts from above.
• drive the dowels in flush to the front of the cover.
• tighten the cover mount ing bolts alternately and in
stages .
Tightening Torque
• Front timing cover
to cylinder block or cylinder head . . . . 10 Nm (89 in-Ib)
3. Install the oil pan using a new gasket. See 119 Lubri-
cation System .
4 . Mount the primary timing chain sprocket to the primary
chain
50
that the arrow on the sprocket faces up. Mount
the sprocket to the camshaft such that the tapp ed holes
in the camshaft are on the left side of the elongated
holes in the sprocket. See Fig. 19.
Fig. 19.
Prima,y
llfnulg chaul sproc ket
correc ty
aligned
to
e. I '31ls1
camsna Elongated sprocket holes should be aligned 1 0 !ell
sine ot IIlJ eade-:l camshaft 11 01 " 5.
5. On 1993 and later cars. install BMW special tool no. 11
3 390 into Ihe primary timing cha in tensio ner sleeve .
Thread the tool in finger tight until the slack is removed
from the chain. Check that the elonga ted holes in the
primary sprocket are ce ntered to the bolt holes in the
camshaft and the chain is free of slack .
CAMSHA FT TIM ING CHAIN