Engine timing, valve train,  M110

Replacing timing chain

 

 

05—320 Replacing timing chain

 

Valve clearance
Cold engine (approx. 20 °C) (68 °F) Warm engine (60 °C ± 15 °C) (140°F±59°F)

 

Intake
0.101)
0.151)

 

Exhaust
0.25
0.30

 

M 0.05 mm more for consistent outside temperatures below —20 °C (—4.0 °F).

 

Tightening torques
Nm
Cylinder head cover bolts and capped nuts
5
Chain tensioner ball locating ring
25
Valve adjusting screw
20-40
Special tools

 

 

Depressor for valve springs
m110 - 0196-1.jpg
110 589 04 61 00

 

27 mm wrench socket, to turn engine
1/2″
square,
UP
11004-tvn
001 589 65 09 00
Rigid chain tensioner

 

 

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110 589 03 31 00
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Holder for chain tensioner
m110 - 0196-2.jpg
110 589 02 31 00

 

Valve adjusting wrench 17 mm

m110 - 0196-3.jpg

11004-7003
110 589 01 01 00

 

Wrench socket 10 mm, 1/2″ square, 140 mm long
m110 - 0196-4.jpg
000 589 05 07 00

 

05.2-320/1 F3

 

 

 

Note
m110 - 0197-1.jpg
For repairs a repair chain with plug link, part no. 000 997 69 94 is available.
If only an endless timing chain with 130 links is available, chain can be split by grinding into both pins of a link and using a plug link for assembly. (Do not apply pressure, since this would result in lateral deflection). Use only one plug link, part no. 000 997 05 98 with two lock washers.
Check sprockets for scoring and pitting.
J05-9259

 

Replacing
m110 - 0197-2.jpg
1    Remove spark plugs and take off cylinder head cover.
2   Remove rocker arm of righthand camshaft (ex­haust) (05—230), so that camshaft will not rotate in jerks.
3   Remove chain tensioner (05—310). Install rigid chain tensioner and tighten by hand.
Chain drive
1 Exhaust camshaft sprocket 2-2b Sliding rail
3   Intake camshaft sprocket
4   Guide wheel
5   Lock screw
6   Intermediate gear
7   Timing chain
8   Camshaft sprocket
9   Bearing pin tensioning rail
10  Tensioning rail
11   Hydraulic chain tensioner

 

4 Cover chain housing with a clean cloth and break timing chain with chain separating device or grind off both chain pins of one link.
m110 - 0197-3.jpg

 

05.2-320/2 F3

 

 

 

5 Connect new timing chain to old timing chain with one link, whereby the broken link is pressed out.
m110 - 0198-1.jpg

 

6 Turn crankshaft in engine’s direction of rotation slowly with a 27 mm socket wrench and a ratchet, and at the same time lift the old chain until the link is at the uppermost point of the right camshaft sprocket.
Attention!
While turning the timing chain must be in constant engagement on both camshaft sprockets.
m110 - 0198-2.jpg

 

7 Detach old timing chain and connect ends of new timing chain with one link. Install center bar (arrow) and outer bar. Press on lock washers.
m110 - 0198-3.jpg

 

8   Turn crankshaft and check adjustment marks with engine in TDC position.
9   Disassemble chain tensioner, move to assembly po­sition and install (05-310).
10    Install rocker arms (05-230).
11    Adjust valve clearance of exhaust camshaft (05-210).
m110 - 0198-4.jpg

 

05.2-320/3 F3