1999 Volvo Penta "WT" Models Workshop Manual, Page 125Get this manual
Valve Train The valve train is ball-pivot typeMotion is transmitted from the camshaft through the valve lifter and valve push rod to the valve rocker armThe valve rocker arm pivots on its ball and transmits the camshaft motion to the valveThe valve lifters with roller followers keep all parts of the valve train in constant contactEach lifter acts as an automatic adjuster and maintains zero lash in the valve trainThis eliminates the need for periodic valve adjustment
Intake Manifold
The intake manifold assembly is two-piece designThe upper portion is made from composite material and lower portion is cast-aluminumThe throttle body attaches to the upper manifold
Tools and Shop Equipment
A clean, well-lit, work area should be availableOther necessary equipment includes: suitable parts cleaning tank, compressed air supply, trays to keep parts and fasteners organized, and an adequate set of hand toolsAn approved engine repair stand will help aid with the work and help prevent personal injury or component damageSpecial tools are listed and illustrated throughout this section with complete listing at the end of the sectionThese tools (or their equivalents) are specially designed to quickly and safely accomplish the operations for which they are intendedThe use of these special tools will also minimize possible damage to engine componentsSome precision measuring tools are required for inspection of certain critical componentsTorque wrenches are necessary for the correct assembly of various parts