4.2. Removal of the engine from the car and capital repairs of the engine

Specifications

Head of cylinders

Height (new head):

Models till 1993 of the issue. 140.5 ± 0.1 mm
Models since 1994 of the issue. 139.4 - 139.6 mm

Height (new head):

Height (minimum):
Models till 1993 of the issue. 140.1 mm
Models since 1994 of the issue. 139.0 mm
Valve rod side play in the directing plug
(maximum)
0.50 mm (measurement is performed at the head of the valve raised over a saddle by 3 mm)

Valves

Diameter of a plate of the valve:

Inlet valve 33.0 mm
Final valve 29.0 mm
Angle of processing of a facet of the valve
(only for inlet valves)
44.34 ° - 44.67 °
Valve saddle facet corner 45 °

Diameter of a rod of the valve:

Inlet valve 6.960 - 6.975 mm
Final valve 6.965 - 6.980 mm
Free length of a valvate spring 45.5 ± 1.5 mm

The end face of a rod of the valve is lower than the surface of the bearing of a cam-shaft on:

When checking 19.5 ± 0.05 mm min. - 20.5 ± 0.05 mm max.
At installation 20.0 mm min. - 20.4 mm max. (20.2 mm of number.)

Block of cylinders

Diameter of cylinders:

B202 engines:

Nominal (A) 90.000 - 90.010 mm
Nominal (B) 90.010 - 90.020 mm
With excess, 1 90.500 mm
With excess, 2 91.000 mm

B204 and B234 engines:

Nominal (A) 90.000 - 90.012 mm
Nominal (B) 90.003 - 90.020 mm
Nominal (In +) 90.011 - 90.030 mm
With excess, 1 90.500 - 90.512 mm
With excess, 2 91.000 - 91.012 mm

Balancing shaft

Longitudinal side play 0.050 - 0.450 mm

Diameter of a neck:

Bigger, internal
39.900 ± 0.008 mm
Smaller, external 9.947 - 19.960 mm

Diameter of bearings:

Bigger, internal 39.988 - 40.043 mm
Smaller, external 20.000 - 20.021 mm
Radial gap of bearings (max.) 0.080 - 0.151 mm

Pistons

Measurement of diameter of the piston is performed at the correct coal in relation to a piston lug, and at a certain distance from bottom edge of a skirt of the piston.


Distance from bottom edge of a skirt

B202 1 6.00 mm
B234, models till 1993 of the issue. 9.0 mm
B234L/S, B234L/R/E, models since 1994 of the issue. 9.3 mm
B204i and B234i, models since 1994 of the issue. 11.0 mm

Diameter of pistons:

B202I:

Nominal A
89.971 - 89.980 mm
Nominal AB
9.980 - 89.989 mm
Nominal In
89.989 - 90.000 mm
Nominal With
90.000 - 90.008 mm
With excess 1 (0.5 mm)
90.470 - 90.485 mm
With excess 2 (1.0 mm)
90.970 - 90.985 mm
Nominal piston gap (for new pistons) 0.010 - 0.039 mm

B202 of Turbo and B202S:

Nominal A
89.967 - 89.977 mm
Nominal AB of 89.977 - 89.985 mm
Nominal B 89.985 - 89.993 mm
Nominal With 89.993 - 90.009 mm
With excess 1 (0.5 mm) 90.470 - 90.485 mm
With excess 2 (1.0 mm) 90.970 - 90.985 mm
Nominal gap of pistons (new) 0.015 - 0.043 mm

B204 and B234:

Nominal A 89.971 - 89.980 mm
Nominal AB 89.980 - 89.989 mm
Nominal B:
B234i till 1993 of the issue. 89.989 - 90.000 mm
B204/B234 since 1994 of the issue. 89.989 - 90.000 mm
Turbo B234 till 1993 of the issue. 89.989 - 89.997 mm
Nominal C
B234i till 1993 of the issue.
90.000 - 90.013 mm
B204/B234 since 1994 of the issue. 90.000 - 90.013 mm
Turbo B234 till 1993 of the issue. 89.997 - 90.013 mm
With excess 1 (0.5 mm) 90.482 - 90.488 mm
With excess 2 (1.0 mm) 90.972 - 90.988 mm
Nominal gap of the piston (new):
Models till 1993 of the issue.
0.006 - 0.041 mm
Models since 1994 of the issue. 0.011 - 0.041 mm

Rods

The maximum difference in scales of any two rods:

B202
9.0
B204/B234 6.0

Crankshaft

Longitudinal side play (for all engines) 0.06 - 0.31 mm

Diameter of necks of radical bearings:

Nominal 57.981 - 58.000 mm
With excess 1 57.731 - 57.750 mm
With excess 2 57.481 - 57.500 mm
With excess 3 57.237 - 57.250 mm
With excess 4 56.987 - 57.000 mm

Diameter of conrod necks:

Nominal 51.981 - 52.000 mm
With excess 1 51.731 - 51.750 mm
With excess 2 51.481 - 51.500 mm
With excess 3 51.237 - 51.250 mm
With excess 4 50.987 - 51.000 mm

The most admissible ellipsoidnost of necks of bearings (for all engines):

New
0.005 mm
Worker 0.050 mm

Radial gap of radical bearings:

B202 0.020 - 0.062 mm
Issue B204/B234 till 1993. the issue 0.020 - 0.062 mm
B204/B234 since 1994 of the issue. 0.014 - 0.062 mm

Radial gap of bearings of the lower head of a rod:

Till 1993 issue.
0.026 - 0.062 mm
Since 1994 issue. 0.020 - 0.068 mm

Piston rings

Gaps in locks:

Top compression ring:

B202
0.35 - 0.48 mm
B204/B234 0.30 - 0.50 mm

Second compression ring:

B202 0.25 - 0.38 mm
B234 till 1993 of the issue. 0.30 - 0.45 mm
B204/B234 since 1994 of the issue. 0.15 - 0.65 mm
Oil scraper ring (can be segmentary) 0.38 - 1.40 mm

Side gap in a ring flute:

Top compression ring:

All engines of 0.050 - 0.082 mm  

Second compression ring:

Till 1993 issue. 0.034 - 0.070 mm
Since 1994 issue. 0.040 - 0.072 mm
Oil scraper ring It is not regulated

Efforts of tightening of threaded connections

Address Specifications in the Head Remont of the engine.