- Rotate crankshaft until "0" mark on flywheel aligns with timing mark on flywheel cover. Remove inspection panel from valve cover. On 900 Series, disconnect ignition leads and vacuum hose from distributor. Remove distributor (if equipped). On 9000 Series, remove ignition cartridge.
- Remove valve cover. Remove camshaft sprocket retaining bolts. Remove chain tensioner, camshaft sprockets, and timing chain. Remove oil line and camshaft bearing caps. Remove camshafts.
Installation
- Ensure "0" mark on flywheel aligns with timing mark on flywheel cover. Install intake camshaft with bearing caps No. 1 through 5, and exhaust camshaft with bearing caps No. 6 through 10.
- Tighten bearing cap bolts to specification. See «TORQUE SPECIFICATIONS»(ref-122044-S10517426912001091300000) table. Rotate camshafts until they are aligned with their respective timing marks. (Scheme 2) Reverse removal procedure to complete installation.
Scheme 2
Remove timing chain cover. See TIMING CHAIN . Remove upper chain guide, chain tensioner, and pivoting guide. Remove idler sprocket and balance shaft chain. Pull oil pump drive and balance chain drive sprocket from crankshaft. Carefully pull balance shafts from engine block.
- Ensure "0" mark on flywheel aligns with timing mark on flywheel cover. Lubricate balance shaft journals and bearing housings. Carefully insert balance shafts into their respective bores. Shaft marked INL goes into intake side of engine. Ensure timing marks on balance shaft bearing housings and sprockets are aligned.
- Install balance shaft chain and idler sprocket, leaving some slack in area of tensioner. Keep chain reasonably taut with upper chain guide. Press plunger on chain tensioner. Maintain plunger in position by inserting paper clip into hole in housing. Ensure plunger is turned to position in which spring acts fully upon it.
- Install chain guides and tensioner. Remove paper clip to set tensioner. Rotate crankshaft several times. Ensure timing marks align. To complete installation, reverse removal procedure. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(ref-122044-S10517426912001091300000) table.