Does Replacing Connecting Rods Require Major Engine Disassembly?
2 Answers
Replacing piston connecting rods does not require complete engine disassembly, but it is necessary to remove the engine cylinder head and oil pan for replacement. However, some mechanics may remove the entire engine assembly for easier operation. Below are the reasons for connecting rod breakage: 1. Water in the cylinder. If water enters the engine cylinder, it can create increasing compression pressure on the connecting rod, leading to bending or deformation of the removed connecting rod. 2. Abnormal fuel injector spray. Most excavator engines are either 4-cylinder or 6-cylinder. If one cylinder's injector continuously sprays fuel, the likelihood of connecting rod bending or deformation is very high.
Replacing connecting rods indeed requires major engine disassembly. After years in auto repair, I can confirm this job always involves opening up the entire upper section. First, we remove the intake manifold and cylinder head to access the connecting rod assembly, then drop the oil pan to extract the crankshaft. The entire process is quite time-consuming, typically taking about two days, as we must ensure perfect alignment of every bearing and piston ring - otherwise you risk piston slap upon reassembly. V-type engines make this procedure even more complex and costly, with labor potentially exceeding a thousand yuan. I strongly advise against DIY attempts unless you possess professional tools and expert guidance, since improper installation could total the engine. Always opt for a reputable repair shop for such critical work.
