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Development of Plastic Region Tightening Cylinder Head Bolts for New Diesel Engine
In developing the new 2.0-liter and 2-2-liter diesel engines, the plastic region tightening method was applied to the cylinder head bolts, with the following factors taken into consideration:
Ease of precise fastening at expected preload
Reliability against fatigue fracture
Resistance to delayed fracture
This paper describes the effects on these factors of bolt form, i.e., thread length, shank diameter and threaded shank, heat treatment after or before thread rolling, and tensile strength.
Discussed also are reliable specifications based on the preload, gas pressure, and the load due to thermal expansion of the aluminum alloy cylinder head.
Yamashita, H., Makimae, T., Yoshizu, K., and Nakatani, S., "Development of Plastic Region Tightening Cylinder Head Bolts for New Diesel Engine," SAE Technical Paper 851641, 1985,
Hajime Yamashita, Tatsumi Makimae, Kohji Yoshizu, Shigeki Nakatani
Mazda Motor Corp. Technical Research Center, Mazda Motor Corp. Engine Design Engineering Div.
Passenger Car Meeting & Exposition
SAE 1985 Transactions-V94-85
Diesel / compression ignition engines
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