B1BJ0QK1 - 206 TU ENGINE

MATCHING OF BEARING HALF SHELLS, ENGINE NOT MARKED

There are 2 different cases :

- ENGINE WITH IDENTIFICATION
- engine without identification ; engine reworked or fitted with a reground crankshaft

When the crankshaft or cylinder block have no identification markings, use PLASTIGAGE type plastic gauge .

1 - MATCHING USING PLASTIC GAUGES

Clean :

- the crankshaft
- the bearing caps
- the half shells

1 - 1 - ALUMINIUM CYLINDER BLOCK

Fit the (W) grade (black) or half shells of repair dimension on each bearing on the cylinder block side (observe the position of the smooth and grooved half shells) .

Fit the crankshaft .

Fit grade (U) (blue) or half shells of repair dimension on each bearing cap .

Cut lengths of plastic gauge to the width of the shells .

Open the envelope and extract the plastic threads .

Position the plastic threads on the crankshaft journals .

Fit the bearing caps .

Tighten the bearing bolts to 2 da.Nm + 44° .

IMPERATIVE : the crankshaft must not be turned during this operation .

Remove the cap assembly .

Compare the width of the flattened plastigage at its widest point with the graduations on the envelope (scale in mm) .

The value read indicates the running clearance .

NOTE : the measurement may be made on the crankshaft or the shell depending on the adhesion of the bearing surface .

grade of shell for each bearing
operating clearance | category | colour | clearance obtained
--- | --- | --- | ---
0,01 to 0,027 | A (U*) | blue | 0,01 to 0,036
0,028 to 0,039 | C (W*) | black
0,04 to 0,054 | E (Y*) | green
(*) grades of repair dimension half shells

Having selected the shells, check the main bearing running clearance with the PLASTIGAGE gauge .

After checking, clean marks left by the plastic gauge, and oil the crankshaft .

Tighten the bearing bolts to 2 da.Nm + 44° .

1 - 2 - CAST-IRON CYLINDER BLOCK

Fit the (Y) grade (black) or half shells of repair dimension on each bearing on the cylinder block side (observe the position of the smooth and grooved half shells) .

Fit the crankshaft .

Fit grade (Z) (blue) or half shells of repair dimension on each bearing cap .

Cut lengths of plastic gauge to the width of the shells .

Open the envelope and extract the plastic threads .

Position the plastic threads on the crankshaft journals .

Fit the bearing caps .

Tighten the bearing bolts to 2 da.Nm + 49° .

IMPERATIVE : the crankshaft must not be turned during this operation .

Remove the cap assembly .

Compare the width of the flattened plastigage at its widest point with the graduations on the envelope (scale in mm) .

The value read indicates the running clearance .

NOTE : the measurement may be made on the crankshaft or the shell depending on the adhesion of the bearing surface .

grade of shell for each bearing
operating clearance | category | colour | clearance obtained
--- | --- | --- | ---
0,025 mm | A (Z*) | blue | 0,01 to 0,036
0,038 mm | B (Y*) | black
0,051 to 0,076 mm | C (X*) | green
(*) grades of repair dimension half shells

Having selected the shells, check the main bearing running clearance with the PLASTIGAGE gauge .

After checking, clean marks left by the plastic gauge, and oil the crankshaft .

Tighten the bearing bolts to 2 da.Nm + 49° .