Tolerances and Wear Limits Engine

Engine type

M 28.43/44/45/46/41 /42/47 When in- Wear stalled (new) Limits

Engine type M 28.21/22

When in- Wear stalled (new) Limits

Valve guide/valve stem

Intake

Exhaust

Compression clearance

8 bar and above

8 bar and above

Pistons and Connecting Rods

Cylinder/piston

clearance

0.024...

0.048 app.0.080

0.008..

..0.032

Mahle

K.S.

Mahle

K.S.

Piston rings

Side Nut 1

0.06...

0.05...

0.05...

0.04...

clearance

0.102 0.082

0.082

Nut 2

0.04...

0.05...

0.04...

0.02...

0.072

0.082

0.072

0.072

Nut 3

0.013...

0.023...

0.036..

.0.036...

0.127

0.137

0.136

0.136

Piston rings

end gap

Nut 1 =

0.20...0.40

Nut 1 =

= 0.20...0.40

Nut 2 =

0.20...0.40

Nut 2 =

= 0.20...0.40

Nut 3 =

0.40...1.40

Nut 3 =

=0.40...0.90

app. 0.080

0.072

app. 0.080

0.072

Conrod bushing/piston pin radial play 0.018...0.032 0.018...0.032

Crankshaft and Engine Block

Crankshaft runout 0.04 max. 0.06 0.04 max. 0.06

(measured on 2nd, 3rd or 4th bearing, bearings 1 and 5 on v-blocks)

Conrod bearing journal dia. 51.971 ...51.990 51.971...51.990

Conrod bearing/crankshaft radial play 0.034...0.092 0.027...0.069

Crankshaft bearing journal dia. 69.971 ...69.990 69.971...69.990

Crankshaft bearing/

crankshaft radial play 0.020...0.098 0.16 0.028...0.070 0.16 Crankshaft bearing/

crankshaft axial play 0.110...0.312 0.40 0.06...0.192 0.40

Cylinder bore out of rue 0.010 0.020 0.010 0.020

+1 0

Post a comment