PISTON RING FITTING PISTON RING END GAP NOTE: Before reinstalling used rings or installing new rings, the ring clearances must be checked. 1. Wipe the cylinder bore clean. 2. Insert the ring in the cylinder bore. NOTE: The ring gap measurement must be made with the ring positioned at least 12 mm (0.50 inch.) from… Read More »
1. Before installing piston and connecting rod assemblies into the bore, install the piston rings (Refer to 9 – ENGINE/ENGINE BLOCK/PISTON RINGS – STANDARD PROCEDURE). 2. Immerse the piston head and rings in clean engine oil. Position a ring compressor over the piston and rings. Tighten ring compressor. Ensure position of rings do not change… Read More »
Check the connecting rod journal for excessive wear, taper and scoring (Refer to 9 – ENGINE/ENGINE BLOCK/ CONNECTING ROD BEARINGS – STANDARD PROCEDURE). Check the connecting rod for signs of twist or bending. Check the piston for taper and elliptical shape before it is fitted into the cylinder bore (Refer to 9 – ENGINE/ENGINE BLOCK/PISTON… Read More »
CAUTION: DO NOT use a wire wheel or other abrasive cleaning devise to clean the pistons or connecting rods. The pistons have a Moly coating, this coating must not be damaged. 1. Using a suitable cleaning solvent clean the pistons in warm water and towel dry. 2. Use a wood or plastic scraper to clean… Read More »
1. Disconnect negative cable from battery. 2. Oil pan and gasket/windage tray (Refer to 9 – ENGINE/LUBRICATION/OIL PAN – REMOVAL). 3. Cylinder head covers (Refer to 9 – ENGINE/CYLINDER .HEAD/CYLINDER HEAD COVER(S) – REMOVAL) and (Refer to 9 – ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) – REMOVAL). 4. Timing chain cover (Refer to 9 – ENGINENALVE TIMINGIT/MING… Read More »
PISTON FITTING 1. To correctly select the proper size piston, a cylinder bore gauge (2), capable of reading in 0.003 mm (0.0001 in.) INCREMENTS is required. If a bore gauge is not available, do not use an inside micrometer. 2. Measure the inside diameter of the cylinder bore at a point… Read More »
CAUTION: Do not use a metal stamp to mark connecting rods as damage may result, instead use ink or a scratch awl. The pistons are made of a high strength aluminum alloy. Piston skirts are coated with a solid lubricant (Molykote) to reduce friction and provide scuff resistance. The piston top ring- groove and land… Read More »
1. Lubricate tappets. CAUTION: S.7L engines equipped with MDS uses both standard roller tappets and deactivating roller tappets, for use with the Multi Displacement System. The deactivating roller tappets must be used In cylinders 1,4,6,7. The deactivating tappets can be identified by the two holes in the side of the tappet body, for the latching… Read More »
1. Disconnect the negative cable from the battery. 2. Remove the air cleaner housing (3) (Refer to 9 – ENGINE/AIR INTAKE SYSTEM/AIR CLEANER HOUSING – REMOVAL). 3. Remove intake manifold (Refer to 9 – ENGINE/MANIFOLDS/INTAKE MANIFOLD – REMOVAL). 4. Remove cylinder head cover (Refer to 9 – ENGINE/CYLINDER HEAD/CYLINDER HEAD… Read More »
HYDRAULIC TAPPETS Before disassembling any part of the engine to correct tappet noise, check the oil pressure. If vehicle has no oil pressure gauge, install a reliable gauge at the pressure sending-unit. The pressure should be between 207-552 kPa (30-70 psi) at 3,000 RPM. Check the oil level after the engine reaches normal operating temperature.… Read More »