The cylinder head gasket (CHG) joint is the most critical sealing joint for IC engine performance. Cylinder head bolt preload application should be stoichiometric. Excess cylinder head bolt pre-tension develops more stress and further leads to bore deformation. Insufficient cylinder head bolt pre-tension leads to gasket leakage. It is challenging to achieve uniform pressure distribution because of variation in stiffness of block and head. But the minimum pressure must be ensured for leak-proof joint. In this article, gasket pressure distribution around the cylinder bore is estimated by non-linear Finite Element Analysis (FEA) and compared with Fuji Film results. Bore deformations, due to spiral and cross patterns, are determined and compared. Piston ring conformability is estimated in terms of percentage sealing of the ring to the liner. Effects of bolt tightening strategies are investigated for engine gasket sealing parameter, bore deformation and piston ring conformability. © 2018 Engineers Australia.

Venkatachalam G

Mechanical

School of Mechanical Engineering

Chennai Campus

Marathe A.V

Marathe N.V.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Cylinder Head Bolt Tightening Strategies in Case of Multi-Cylinder Engines and Its Effect on Gasket Sealing Performance, Bore Deformation and Piston Ring Conformability

Australian Journal of Mechanical Engineering

Cylinder Head Gasketed joint is one of the important joint for internal combustion engines. The main function of cylinder Head Gasketed joint is to seal combustion gases, oil and coolant and avoid entering the air into combustion chamber. Preload is applied on cylinder head bolt to avoid the leakages. Excessive preload on cylinder head bolt will cause extra stresses and cylinder bore deformation also increased which reduces the engine performance. Hence, it is very essential to determine adequate and accurate preload on cylinder head bolts. There are different types of bolt tightening methods followed by engine manufacturers as compared to other methods loss of preload and preload variation is less in angle torque method. In this work, Angle torque method for cylinder head bolted joint classical mathematical model is developed to estimate the snug torque and angle torque. Model is validated with FE analysis and experimental work. High performance 3-cylinder diesel engine's cylinder head, cylinder head bolts and crankcase are taken for methodology development, FE and experimental work.

International Journal of Manufacturing, Materials, and Mechanical Engineering

Angular Torque Methodology for Cylinder Head Bolted Joint and Validation by FE and Experimental Work

Procedia Engineering

Simulation of Optimized Bolt Tightening Strategies for Gasketed Flanged Pipe Joints

Sealing Technology

Head gasket with a double half-bead structure

Journal of Pressure Vessel Technology

Achieving Uniform Clamp Load in Gasketed Bolted Joints Using a Nonlinear Finite Element Model

International Journal of Automotive Technology

Assessment of an engine cylinder head-block joint using finite element analysis

Journal	Australian Journal of Mechanical Engineering
Publisher	Informa UK Limited
ISSN	1448-4846
Open Access	No