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Omega A (1986-1993) Omega B (1993-1999) Omega B2 (1999-2003)

Technical specifications (Opel Omega B)

Cylinder head
Maximum permissible non-flatness of the lower surface cylinder heads	N/A
Cylinder head height	140 mm
Valve seat width	1.4 – 1.8 mm
Valves
Height of valve guide bushing in cylinder head	11.20 – 11.50 mm
Valve stem diameter:
– inlet valve:
• nominal (K)	5.955 – 5.970 mm
• 1st size up (0.075 mm – K1)	6.030 – 6.045 mm
• 2nd larger size (0.150 mm – K2)	6.105 – 6.120 mm
– exhaust valve:
• nominal (K)	5.945 – 5.960 mm
• 1st size up (0.075 mm – K1)	6.020 – 6.035 mm
• 2nd larger size (0.150 mm – K2)	6.095 – 6.110 mm
Valve stem outlet	less than 0.03 mm
Valve guide bore diameter:
– nominal (K)	6,000 – 6,012 mm
– 1st increased size (0.075 mm – K1)	6.075 – 6.090 mm
– 2nd larger size (0.150 mm – K2)	6.150 – 6.165 mm
Clearance between valve stem and valve guide	N/A
Valve length:
- new	97.1 – 97.2 mm
- minimum	96.9 – 97.0 mm
Valve Plate Diameter:
- inlet valve	28.9 – 29.1 mm
- exhaust valve	25.9 – 26.1 mm
Cylinder block
Maximum permissible non-flatness	N/A
Cylinder diameters:
- standard:
• size group 8	83.975 – 83.985 mm
• size group 99	83.985 – 83.995 mm
• size group 00	83.995 – 84.005 mm
• size group 01	84.005 – 84.015 mm
• size group 02	84.015 – 84.025 mm
- increased size (0.5 mm)	N/A
Maximum cylinder ovality	N/A
Maximum cylinder taper	N/A
Pistons and rings
Piston diameter:
- standard:
• size group 8	N/A
• size group 99	N/A
• size group 00	N/A
• size group 01	N/A
• size group 02	N/A
- increased size (0.5 mm)	N/A
Piston clearance in cylinder	N/A
Piston ring lock clearances (installed in the hole):
- upper and lower sealing rings	0.3 – 0.5 mm
- oil scraper ring	0.4 – 1.4 mm
Piston ring clearance in the piston:
- upper and lower sealing rings	0.02 – 0.04 mm
- oil scraper ring	0.01 – 0.03 mm
Piston ring thickness:
– upper sealing ring:
• x20DTL engine	2.00 mm
• x20DTH engine	2.50 mm
- lower sealing ring:
• x20DTL engine	1.75 mm
• x20DTH engine	2.00 mm
- oil scraper ring	3.0 mm
Piston pins
Diameter	29 mm
Length	68 mm
Connecting rod
Lower connecting rod end side clearance	0.07 – 0.28 mm
Crankshaft
Axial play	0.05 – 0.15 mm
Main journal diameters:
– 1st size group (green)	67.966 – 67.974 mm
– 2nd size group (brown)	67.974 – 67.982 mm
– 1st reduced (0.25 mm)	67.716 – 67.732 mm
– 2nd reduced (0.50 mm)	67.466 – 67.482 mm
Connecting rod journal diameters:
- standard	48.971 – 48.990 mm
– 1st reduced (0.25 mm)	48.721 – 48.740 mm
– 2nd reduced (0.50 mm)	48.471 – 48.490 mm
Maximum ovality	0.03 mm
Maximum taper	N/A
Main bearing working clearance	0.016 – 0.069 mm
Operating clearance of the lower connecting rod bearing	0.010 – 0.061 mm

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Opel Omega B: Diesel engine repair 2.0 l

Next articles

Overhaul of a 2.0 liter diesel engine

Cylinder head
Pistons and connecting rods — removal, inspection and installation
Crankshaft — removal, inspection and installation
Engine Cylinder Block — Cleaning
Main and connecting rod bearings
Sequence of engine assembly during major repairs

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