1084B18 ENGINE OIL PUMP, REMOVED - CHECK AT BENCH - Alfa - 156 - eLearn

3239082 - 1084b18 engine oil pump, removed - check at bench

) Position the engine oil pump in a vice fitted with projective jaws.1. Fit the tool.

	Name	Country
1	Counter-torque/Template	1.870.799.000

2. Undo the bolt (2a) and remove the oil pump drive chain assembly (2b).Remove the tool.

	Name	Country
-	Counter-torque/Template	1.870.799.000

1. Undo the bolts (1a) and remove the oil pump cover (1b).2. Remove the driven gear.3. Remove the drive gear.4. Undo the plug (4a) and remove the oil pressure relief valve (4b).Remove the crankshaft front oil seal.

Reassembling ( Dismantling

) Check the wear of the oil pump drive chain and, if necessary, replace the oil pump drive chain assembly.Check that the radial clearance between driven gear and pump casing is within the recommended limits; if this is not the case, replace the engine oil pump.

	Measurement		Value
-	Radial clearance between gears and pump casing (mm)		0.110 - 0.180

Check that the axial clearance between the upper side of the gears and the oil pump cover support plane is within the recommended limits; if this is not the case, replace the engine oil pump.

	Measurement		Value
-	Gear. cover upper end float/ (mm)		0.016 - 0.086

Check that the height of the spring for the engine oil pressure relief valve is within the recommended limits; if this is not the case, replace the spring.

	Measurement		Value
-	Check load (daN)		11.73 - 12.51
	Height (mm)	35

1. Fit a new crankshaft front oil seal (1a) using the tool (1b).

	Name	Country
1b	Fitting tool	1.821.247.000

Fit the oil pressure relief valve and tighten the nut.Fit the drive gear.Fit the driven gear.Fit the oil pump cover and tighten the bolts.

Manually rotate the gears to check that they turn without sticking.

Position the engine oil pump in a vice fitted with projective jaws.1. Fit the tool.

	Name	Country
1	Counter-torque/Template	1.870.799.000

2. Fit the oil pump drive chain assembly (2a) so that the references (2b) coincide and tighten the bolt (left-hand thread) (2c) to torque.

	Fastening	Component	Ø	Value(daNm)
2c	Left hand thread bolt	OIL PUMP GEARS	M10	0.6 - 0.7

WARNING: When checking the timing of a counter-rotating shaft on an engine that has not been serviced, the reference marks (arrows) on the gear secured to the crankshaft and chain body may be misaligned.If this misalignment is 90° or 180° or 270°, this is not a timing error but indicates that the Production department has used a timing adjustment procedure different to the procedure recommended for Servicing.It is not possible to check the counter-rotating shaft timing adjustment carried out during production; therefore the procedure described for Servicing must be followed.