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- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
Main Bearing Set 0.25mm Oversize Inner - Standard Outer
Main bearings support the crankshaft within the crankcase
and provide the accurately controlled running clearance required for reliable
lubrication and smooth crankshaft rotation. This set is intended for engines
requiring a 0.25mm oversize inner bearing specification and is supplied with 12
bearings plus 2 thrust bearings.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
Diagram Ref No 23 and 24
Specification: 0.25mm oversize inner / standard outer
Contents: 12 bearings + 2 thrust bearings
What Do the Main Bearings Do?
Main bearings support the crankshaft as it rotates within the engine. Pressurised oil creates a lubricating film between the crankshaft journals and bearings, reducing friction and wear.
The thrust bearings also control axial movement of the crankshaft.
Why Do Main Bearings Wear?
Bearing wear can result from:
- High engine mileage
- Low oil pressure or oil starvation
- Contaminated engine oil
- Incorrect bearing clearances
- Crankshaft journal wear
- Engine overheating
- Previous internal engine damage
The cause of abnormal bearing wear should always be identified during an engine rebuild.
Why Use 0.25mm Oversize Bearings?
This is not a standard-size bearing set.
The 0.25mm oversize inner specification is intended for an engine where the crankshaft has been measured or machined to require this corresponding bearing size.
Accurate crankshaft and crankcase measurements are essential before ordering. Oversize bearings should not be selected simply because the existing bearings are worn.
When Should Main Bearings Be Replaced?
Main bearings should be inspected during an engine rebuild and replaced if they show scoring, excessive wear, surface damage, incorrect clearance or evidence of oil starvation.
Crankshaft journals, bearing housings, oil passages and thrust surfaces should also be inspected before assembly.
Main Bearing Sets
Correct main bearing selection is essential when rebuilding an air-cooled Porsche flat-six engine. The bearings support the crankshaft, maintain the required oil clearance and help ensure reliable lubrication throughout the engine.
This OE Match 0.25mm oversize inner main bearing set is designed for Porsche 911 2.7 and 930 Turbo 3.0 engines requiring this specific bearing dimension.
Always measure the crankshaft journals and crankcase accurately before selecting standard or oversize bearings. Design911 supplies Porsche main bearings, thrust bearings and associated engine rebuild components for classic air-cooled Porsche applications.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110190250
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
Identification: Yellow
Fits:
Porsche 957 Cayenne 3.0L DIESEL 2007-10
Porsche 958 Cayenne 3.0L / 4.2L DIESEL 2011-18
Porsche 95B Macan V6 TDI 2014-18
Porsche 970 Panamera 3.0L DIESEL 2010-16
Click 'Zoom in' for large parts diagram.
Diagram Ref No 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810124114
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
Identification: Yellow
Fits:
Porsche 957 Cayenne 3.0L DIESEL 2007-10
Porsche 958 Cayenne 3.0L / 4.2L DIESEL 2011-18
Porsche 95B Macan V6 TDI 2014-18
Porsche 970 Panamera 3.0L DIESEL 2010-16
Click 'Zoom in' for large parts diagram.
Diagram Ref No 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810124214
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
Identification: Blue
Fits:
Porsche 957 Cayenne 3.0L DIESEL 2009-10
Porsche 958 Cayenne 3.0L / 4.2L DIESEL 2011-18
Porsche 95B Macan V6 TDI 2014-18
Porsche 970 Panamera 3.0L DIESEL 2010-16
Click 'Zoom in' for large parts diagram.
Diagram Ref No 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810124113
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
Identification: Blue
Fits:
Porsche 957 Cayenne 3.0L DIESEL 2009-10
Porsche 958 Cayenne 3.0L / 4.2L DIESEL 2011-18
Porsche 95B Macan V6 TDI 2014-18
Porsche 970 Panamera 3.0L DIESEL 2010-16
Click 'Zoom in' for large parts diagram.
Diagram Ref No 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95810124213
The product you are viewing cross references to these numbers