What is the purpose of using short pieces of hose when assembling an engine?

The purpose of using short pieces of hose when assembling an engine primarily revolves around protection and spacing. In this context, using short pieces of hose can serve to protect the rod journals from potential damage during assembly. Rod journals are critical components that connect the connecting rods to the crankshaft; any scratches or wear on these surfaces can lead to severe performance issues or even engine failure.

Using hose can help create a barrier that prevents direct contact with tools or other hard surfaces, minimizing the risk of marring or damaging these crucial areas. The hoses can also act as spacers, ensuring that components are properly aligned during the assembly process. This protective measure is particularly important in delicate engine assembly tasks where precision and care are paramount.

Although other components like cam bearings, rod bearings, and main bearings also require protection during assembly, the need to specifically safeguard the rod journals from potential injuries makes that answer particularly valid in this case.