VALVE STEM OIL 'O' RING
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Cylinder heads - valve & guides
Cylinder head, valve and guides: Up to engine No TD22734 the cylinder head had “oval” water holes in the face and used ½” reach spark plugs. From engine No TD22735 the cylinder head had “round” water holes in the face and used ¾” spark plugs, the heads are best identified by the casting number embossed on the top to the head on the manifold side of the engine between the front two head stud holes. The TF 1200cc and 1500cc heads have the same casting number as the later TD heads but have the larger valve sizes and different combustion chamber volumes
Rocker Gear: The rocker gear fitted to the TD engine up to engine No TD9007 was the same as fitted to the TC with shorter bosses on the straight rockers, Nos 1,4,5,& 8, than on the angled rockers and with washers only at the outer ends of the end springs. From engine No XPAG TD/9008 rockers Nos 1,4,5 & 8 were changed to have the same length boss and bush as the angled rockers. The damping springs were changed to suit, washers were fitted between the ends of the springs and the rockers and a longer rocker shaft was fitted (14.75”).
