Connecting Rod Bearings (.50mm Oversize) – 021-105-713A Ensure the internal longevity of your engine rebuild with these .50mm (0.020") Oversized Connecting Rod Bearings. Designed specifically for the Volkswagen Type 4 "pancake" engine and its Porsche counterparts, these bearings are required when a crankshaft has been professionally reground to its first undersize. By providing a precision-machined surface for the connecting rods to rotate upon, these bearings maintain the critical oil film necessary to prevent metal-on-metal contact at high RPMs. These bearings are engineered to handle the unique oiling requirements and thermal loads of the 1.7L, 1.8L air-cooled powerplants. Each bearing shell is constructed from high-strength multi-layer alloy, featuring a steel backing for structural integrity and a soft babbitt overlay to embed any microscopic contaminants. Using oversized bearings allows you to save an original crankshaft that has suffered minor journal wear, returning it to factory-smooth operation. Detailed Vehicle Compatibility Porsche 914: 1970, 1971, 1972, 1973, 1974, 1975, 1976 VW Bus (Type 2): 1972, 1973, 1974, 1975 VW 411: 1971, 1972 VW 412: 1973, 1974 Product Highlights & Features Crankshaft Restoration: Specifically sized for crankshafts that have been turned .50mm (0.020") undersize on the rod journals. Type 4 & Porsche Spec: Precision fit for 1700cc, 1800cc engines sharing the Type 4 architecture. Engine Code / Size: CA - 1700, CB - 1700, EA - 1700, W - 1700, AW - 1800, AP - 1800, ED - 1800 Multi-Layer Construction: Features a heavy-duty steel back with a high-fatigue strength lining for maximum durability under heavy loads. Precision Oil Grooves: Stamped with factory-correct oiling holes to ensure consistent lubrication to the rod journals. Technical Specifications Part Number: 021-105-713A (.50) Oversize Dimension: .50mm / 0.020" Engine Application: Type 4 / 914 Air-Cooled Material: Steel-backed Tri-Metal Alloy Installation & Maintenance Tips Measure Twice: Before ordering, use a calibrated micrometer to verify your crankshaft journals have been ground to exactly .50mm undersize. Installing oversized bearings on a standard-sized crank will cause the engine to seize instantly. Cleanliness is Critical: Even a single speck of dust behind the bearing shell can create a "high spot" that leads to premature bearing failure. Clean the rod bores and crankshaft journals with lint-free wipes before assembly. Assembly Lube: Apply a generous amount of high-pressure engine assembly lube to the bearing faces. Do not use standard engine oil for the initial build, as it may drain away before the engine builds oil pressure on its first start. 021105713A
