Machining Cylinder Head Mating Face

Permissible roughness of mating face: 0,03 mm Max. depth of material removed: 0,2 mm peak-to-valley height = 0,015 mm

MotortypM 28.21/22

Size new A = 24 + 0,1 Size worn A = 23,8

Engine type M 28.43/44/45/46/41/42/47

Installing Cylinder Head (32-valve engines and M 28.21/22) Cylinder head attached by means of threaded studs

Installing Cylinder Head

Torquing sequence (4 steps) see Fig.

Sequence for removal: reverse

2nd step 90° of rotation 3rd step 90° of rotation 4th step 90° of rotation

1 st step 20 Nm

Installing Cylinder Head (32-valve engines) Hexagon cylinder-head bolts


The cylinder head can also be installed with the engine in place. If both cylinder heads are to be removed and installed, it is advisable to remove the engine first.

Torquing sequence (3 steps) Sequence for removal: reverse 1st step 20 Nm

2nd step . 90° of rotation 3rd step 90° of rotation


As a rule, do not use lubricant when Mod. 89 onward new cylinder head installing the cylinder-head nuts or screws hex bolts and washers. new screw length 20 mm longer

It is only necessary to apply a light M 12 x 199

coat of engine oil to the stud bolts M 12 x 149

or hex bolts.

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