Camshaft engine problem Brisbane - FLOGGED / WORN OUT
Camshaft lobes are very prone to wearing out or being wiped as it is referred to. The downward force created by the valve spring combined with the wiping action of the lobe creates a critical point of stress at the lifter that can develop into lobe failure. The lubrication of this point is very important, as the hardened lifter will quickly destroy the lobe if there is surface contact between the lifter and lobe. Modifications to valve springs, valves or lobe profile can promote lobe failure. If a failure of a lobe occurs soon after a camshaft grind it is important to check the finish and convex profile of the lifter base. (.001" to 002") The first few seconds of a reground camshaft's life is very critical. A dry start will start the scuffing of the lobe and total failure as the lobe is wiped away. A small amount of cam lube on new reground lobes is a good practice to help initial bed-in of cam lobes to lifter. (Caution as to the amount of anti- friction additives are used as piston ring bed-in can be effected.) As described elsewhere in this section oil pressure must be established under cranking speed if a new engine is to have a chance to survive. Disclaimer Agreement : Every care has been taken in writing this information and procedures, but no responsibility can be excepted for errors, omissions or misuse of this information and procedures. The information available on this site is for your instruction only and cannot be copied for sale, © copyright 2001 UMR Engines
Camshaft lobe flogged off
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Camshaft engine problem Brisbane -
FLOGGED / WORN OUT
Camshaft lobes are very prone to wearing out or being wiped as it is referred to. The downward force created by the valve spring combined with the wiping action of the lobe creates a critical point of stress at the lifter that can develop into lobe failure. The lubrication of this point is very important, as the hardened lifter will quickly destroy the lobe if there is surface contact between the lifter and lobe. Modifications to valve springs, valves or lobe profile can promote lobe failure. If a failure of a lobe occurs soon after a camshaft grind it is important to check the finish and convex profile of the lifter base. (.001" to 002") The first few seconds of a reground camshaft's life is very critical. A dry start will start the scuffing of the lobe and total failure as the lobe is wiped away. A small amount of cam lube on new reground lobes is a good practice to help initial bed-in of cam lobes to lifter. (Caution as to the amount of anti-friction additives are used as piston ring bed-in can be effected.) As described elsewhere in this section oil pressure must be established under cranking speed if a new engine is to have a chance to survive. Disclaimer Agreement : Every care has been taken in writing this information and procedures, but no responsibility can be excepted for errors, omissions or misuse of this information and procedures. The information available on this site is for your instruction only and cannot be copied for sale, © copyright 2001 UMR Engines
Camshaft lobe flogged off
7 Moss Street, Slacks Creek, Qld 4127
