Connecting Rod Machines

Connecting rod machines perform the reconditioning operations of engine connecting rods after wear or mechanical problems: alignment (correction of twisting and warping), boring of the small/big end bores, honing and grinding. The Chinelatto lineup covers these operations with manual aligners like the A-650-2R and boring machines like MB-98, MB-125 and RB-125, serving connecting rods from motorcycles, cars, trucks and industrial engines. The choice of equipment depends on the type of service your shop performs: alignment uses dedicated machines, while boring and honing require specific equipment.

The manual aligner, like the A-650-2R Chinelatto, offers greater control and precision in the process, allowing gradual fine adjustments until perfect alignment — the operator feels material resistance. Hydraulic models are faster but may apply excessive force and damage more delicate connecting rods (like aluminum ones). For shops with varied work, manual is usually more versatile and safe. Hydraulics produce more in series production of robust connecting rods. The choice depends on the volume and type of connecting rods you process.

The Chinelatto connecting rod machine lineup serves most engines on the market: motorcycles, passenger cars, light and heavy trucks, diesel engines, tractors and industrial machinery. Each model covers a specific range of diameters and lengths — for example, the A-650-2R works connecting rods from 1.18" to 5.67" (Ø30 to 144mm) with 15.75" (400mm) between centers. To define the right model for your application, consider the typical connecting rod sizes your shop processes and refer to each unit's technical datasheet.

Alignment uses tempered expanding blades that fix into the connecting rod bore, expanding to make full contact with the internal wall. The connecting rod hangs between both holes (small end and big end) over the machine's ground surface. With squares and dial indicators, the operator measures misalignment and applies controlled pressure to correct twisting and warping. The blades distribute force evenly, preventing damage to the material. The result is the connecting rod aligned perpendicularly to the crankshaft axis, eliminating vibration and irregular bearing wear.

These are robust machines that mainly need regular cleaning, lubrication of moving parts and rust protection of the ground surface. The expanding blades are the item that wears most with use but last years with proper care. The dial indicators must be calibrated periodically to maintain precision. The cast iron structure is durable — it's not uncommon for these machines to work for decades with basic maintenance. Chinelatto supplies spare parts for the entire lineup when needed.