' Engine body 14. Fit the sea water pump on the timing gear casing. Connect the water hoses to the pump. 6. MD2O10, MD2020: Remove the gear for the mechanical tachometer drive*. 15. Fit the drive belt to the alternator. Note: If the tension is correct the belt should be able to be pressed in approx. 10 mm (.40 i n) be- t ween the pulleys. * Note: Mechanical tachometer driving is not used by Volvo Penta. The gear must, however, be in position. 16. Open the fuel cocks. Bleed the fuel system as per the directions on page 59. 17. Connect the battery leads. I nspection of valve lifter and camshaft NOTE! If the lifter is worn over the lift surface the lifter must be scrapped.
The "dike" shows that the lifter has not rotated. A dark stripe on the outer lift surface shows, however, that the surface is not worn. I t is the condition of the valve lifters that determines whether further checking of camshaft wear is necessary. Camshaft Dismantling the camshaft The cam for example may be skew worn in an axial di- rection. This can in less severe cases be adjusted by grinding the cams. Replace the camshaft in the event of further damage or wear. 1. Dismantle the cylinder head. See "Dismantling of cylinder head" on page 25. Lift out the valve lifters and place them in order in a rack. Note: When replacing the camshaft all the valve lifters must be replaced. 2.
Remove the timing gear casing. See under heading "Dismantling of timing gear" on pages 40 and 41. 3. Remove the regulator sleeve from the camshaft. Measuring the camshaft to A Fig. 67. Dismantling of camshaft Fig. 68. Measuring the camshaft. 1. Gear 3. Regulatorsleeve 2. Lock washer Cam height (inlet and outlet) "A", Fig. 68. MD2O10, MD2020, MD2030: min. 26.1 mm (1.027 in) MD2040: 33.7 mm (1.326 in) 4. Remove the screws for the lock plate (one screw is accessible through the hole in the camshaft gear), Fig. 67. Cam height "B" (for injection pump) MD2O10, MD2020: min. 34.3 mm (1.350 in) MD2030: 33.8 mm (1.330 in) MD2040: 41.8 mm (1.645 in) 5.
Lift out the camshaft complete with gear and regu- l ator weights. Note: Observe care so that bearings, bearing races or cams are not damaged. Cam height "C" (for feed pump) MD2O10, MD2020, MD2030: min. 27.0 mm (1.062 in) MD2040: 30.0 mm (1.181 in) On MD2030 and MD2040 the gear for the mechan- i cal tachometer drive* must be removed together with the camshaft. Replace the camshaft if the wear tolerances are not maintained. 44