Questions tagged [general-concept]

Can you help me understand the general "torque-to-yield" concept, which is often used for head bolts. In the case of my Tacoma, the head bolts are specified to be torqued to a spec of 27 ft/lbs and then turned another 180 degrees. As I understand,…

A valve stem seal, which prevents oil from the camshaft case from penetrating into the combustion chamber, is mounted on its valve guide simply by fitting it on with tension. Yet it endures probably millions or tens of millions of reciprocation…

This is a very high level, conceptual question: it seems to me like every engine is designed so that pistons are extracted from the top, which requires removing cylinder heads, a huuuge pain in the rear end. My question is, why aren't they designed…