Tappet Noise Reduction in Motorcycle Engine

  Nakul Bansod,  Harinder Singh Negi

Abstract: The tappet noise is a major concern in Internal Combustion (I.C.) Engines. The tappet noise refers to the noise made by Lash or clearance between rocker arm and valve stem in an engine. It also occurs as a result of lash or clearance between valve lifter and valve stem at start up for at least 30 seconds. The tappet noise is characterized by its characteristitic “tak-tak” sound which is clearly audible on the engine dynamometer at 1400 r.p.m. Tappet noise predominates when engine is in hot condition, i.e. after 4-5 kms of running after it is assembled on the vehicle frame. Earlier there were cases of about 300-350 (average) engines suffering from tappet noise out of the average 1000 engines assembled at an average daily. This led to increase in engine rework after its assembly and considerably leading to annoying noise. Investigations suggested that the camshaft design was the major source of tappet noise. Following that the camshaft design was changed and a new camshaft was introduced by replacing it with the older design of camshaft.. To further reduce the no of cases to minimum the further investigations was started. It was concluded that the change in design does not contribute to the tappet noise anymore. Now the investigations on engine assembly tappet setting station started (both at sub assembly and main assembly station) and it was concluded that the noise was coming due to the improper setting of the tappets (inlet and exhaust) at the sub assembly of tappet setting station and at the main assembly station.

Keywords- Keywords: Tappet Noise, Shim, Decibel, Valve Stem, Lash

Unique Identification Number - IJEDR1502088
Page Number(s) - 461-474
Pubished in - Volume 3 | Issue 2 | May 2015
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Nakul Bansod,  Harinder Singh Negi,   "Tappet Noise Reduction in Motorcycle Engine", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.3, Issue 2, pp.461-474, May 2015, Available at :http://www.ijedr.org/papers/IJEDR1502088.pdf