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Oct 22, 2013 11:48 am
Oct 22, 2013 11:48 am
Subject: Re: Rocker pin survival rate!
Hi John, I had a series of pin and rockers fail a few years ago following the fitting of my new semi downdraft head. The problem was finally traced to a valve guide not fully pressed home. Although when I replaced the broken item I set the correct clearance when the engine heated up the rocker hit the top of the valve guide and then either the pin or rocker broke! As I was on a rally in France at the time I did not fully investigate until I came home. Is it the same rocker/pin failing? Have you had the valve guides changed? I would suggest you check the clearence between the top of the guide and rocker.When I finally found the cause of the problem I took about 20th from the top of each guide.
Hi John, I had a series of pin and rockers fail a few years ago following the fitting of my new semi downdraft head. The problem was finally traced to a valve guide not fully pressed home. Although when I replaced the broken item I set the correct clearance when the engine heated up the rocker hit the top of the valve guide and then either the pin or rocker broke! As I was on a rally in France at the time I did not fully investigate until I came home. Is it the same rocker/pin failing? Have you had the valve guides changed? I would suggest you check the clearence between the top of the guide and rocker.When I finally found the cause of the problem I took about 20th from the top of each guide.