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CYLINDER ENGINE . REMOVE AND OVERHAUL ROCKER SHAFTS AND VALVE GEAR . 1. Remove t h e four screws and lift off the rocker 2. Remove the four rocker shaft bolts and covers lift off t h e assembly complete with baffle plate. 3. Withdraw the pushrods and retain in the sequence removed. Dismantle rocker shafts 5 . Remove the split pin from one end of the rocker 4 . Withdraw the following components and retain 7 . A plain washcr. 8. A wave washer. 9. Rocker arms. shaft. them in the correct sequence for reassembly: Brackets. 11. Springs. the rockers and shafts. Discard weak or broken springs. 4. Remove the hydraulic tappets and place to side with their respective pushrods. If a tappet cannot be removed leave i n position until the camshaft is removed. Inspect tappets and pushrods 13. Hydraulic tappet; inspect inner and outer surfaces of body for blow holes and scoring. Replace or grooved, or has a blow hole extending through the i n a position to permit oil leakage from lower chamber. 14. The prominent wear pattern just above lower end it is definitely grooved or scored. I t is caused by side of t h e cam against body while the tappet is moving vertically i n its guide. 15. Inspect the contact surface of t h e tappets. Fit new tappets i f the surface is worn or damaged. 16. A hydraulic tappet body that has been rotating will have a round wear pattern and a non-rotating tappet body will have a square wear pattern with a very slight depression near the centre. 17. Tappets MUST rotate and a circular wear condition is Tappets can be refitted provided are no other defects. 18. I n t h e case of a non-rotating tappet, fit new replacement and check camshaft lobes for wear; ensure the new tappet rotates freely in the cylinder block. inued 95 |