Main Bearing set. Porsche 356C / 912 - 0.50 case oversize  ❭  616100138

Set Of Main Bearings For Porsche 356C / 912.
Oversize: 0.50 mm Case
Restore correct crankshaft support, oil clearance, and dependable engine operation with this OE Match Set of Main Bearings for Porsche 356C and Porsche 912, available under references 61610013895A, 61610013895AO1, 616100138100A, and 61610013890A.

Engine: Porsche 356C and 912

Sizes available: in "MM"

0.50mm Case / STD Crank
0.50mm Case / STD Crank / Thrust +1mm
0.50mm Case / 0.25mm Crank
0.50mm Case / 0.25mm Crank / Thrust +1mm
0.50mm Case / 0.50mm Crank

Please Pick size when ordering below:

Main bearings are precision internal engine components located between the crankshaft main journals and the engine crankcase. Their purpose is to support the crankshaft while allowing it to rotate smoothly on a controlled film of pressurised engine oil. Correct bearing clearances are essential for maintaining lubrication, controlling crankshaft movement, reducing friction, and protecting the crankshaft and crankcase from excessive wear.  

What This Product Does:

• Supports the crankshaft within the engine crankcase.
• Provides a precision running surface for the crankshaft main journals.
• Allows the crankshaft to rotate smoothly on a lubricating oil film.
• Helps maintain correct crankshaft alignment.
• Controls radial crankshaft movement.
• Helps control crankshaft end float where applicable.
• Reduces direct metal-to-metal contact and friction.
• Supports correct engine oil clearances and lubrication.
• Protects crankshaft journals against excessive wear.
• Withstands substantial combustion and rotational loads.
• Replaces worn or damaged main bearings during an engine rebuild.
• Is intended for compatible Porsche 356C and Porsche 912 engine applications.

Symptoms Of Wear Or Failure:

• Low engine oil pressure.
• Oil pressure becoming particularly low when the engine is hot.
• Deep knocking or rumbling noises from the lower engine.
• Excessive crankshaft movement or end float.
• Metallic particles or bearing material in the engine oil.
• Metallic debris in the oil filter or strainer.
• Excessive main bearing clearance during engine inspection.
• Scoring or abnormal wear of the crankshaft journals.
• Scratched, pitted, or discoloured bearing surfaces.
• Evidence of bearing overheating or oil starvation.
• Uneven or accelerated crankshaft journal wear.
• Serious internal engine damage in advanced cases.

Why Replacement Matters:

• Main bearings are fundamental to the reliability of the engine because they support and locate the crankshaft every time the engine operates. Combustion forces place considerable loads on the crankshaft, and the bearings must maintain a precise lubricated clearance while allowing smooth rotation.
• As main bearings wear, the clearance between the bearing surface and crankshaft journal can increase. Excessive clearance can reduce oil pressure, increase crankshaft movement, and accelerate wear of both the bearings and crankshaft journals. This can eventually result in knocking, poor lubrication, and deterioration of other internal engine components.
• Severe bearing wear can cause the protective oil film to break down, resulting in direct metal-to-metal contact. This may generate excessive heat, score or damage the crankshaft, contaminate the lubrication system with bearing material, and potentially cause major engine failure.
• Correct bearing sizing is especially important when rebuilding a classic Porsche 356C or Porsche 912 engine. Previous crankshaft grinding or crankcase machining can change the required bearing dimensions, meaning a standard-size bearing set may no longer provide the correct running clearance.
• Replacing worn components with the correctly sized OE Match Main Bearing Set – 61610013895A, 61610013895AO1, 616100138100A, or 61610013890A – for Porsche 356C / 912 helps restore correct crankshaft support, oil clearance, lubrication, and dependable engine performance.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

616100138

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