cam                             

When the tappets become worn, Normally 80000 miles The Tappet base becomes concave so when the camshaft rotates, through360 deg.cam in a Rover V8 is Hydraulic in its design, this means when it is manufactured the lobe is cut at a slight angle so that it
rotates the tappets essential for them to fill with oil so even when lobes still look to be intact, if the cam is starting to
discolor it is well on the way out, Tappet pre-load is the distance between the pushrod seat in the lifter and the circlip,
when the lifter is on the heel of the cam and the valve is closed. Not setting the lifter pre-load, will cause premature wear,
noisy valve gear. The following information assumes that the following components are in good condition - rockers, pushrods,
valve guides and valve stems. a clearance of .020" to a maximum of 0.60" must exist between the spring loaded pushrod seat in
the top of the lifter, and the underside of the retaining circlip. This check should be made with the valve gear fully assembled,
and the lifter empty of oil, positioned on the lowest point, on the back of the camshaft. various ways to adjust the pre-load on
the Rover V8. normally a decrease off pre load is required and this is achieved by using the "rocker pedestal shim kit" if the
opposite applies the it would be achieved by machining the rocker pedestals however in race and higher end applications adjustable
pushrods would be used .There are various ways to adjust the pre-load on the Rover V8. normally a decrease off pre load is required
and this is achieved by using the "rocker pedestal shim kit" if the opposite applies the it would be achieved by machining the rocker
pedestals however in race and higher end applications adjustable pushrods would be used., the rocker ration is 1.6 that of the clearance
that needs correcting, so a 16 thou shim will make approx 25 though difference

     MGB                   SD1     

The Illawarra        Gas turbine     ROVER SD1         SS ORONTES     

F100                     MONARO GTS 350       

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