Remove nuts holding spark plug harness to valve cover, remove
spark plug boots and place harness aside.
Remove the eighteen 10mm nuts securing valve cover.
Remove valve cover.
Remove the two 8mm Allen bolts from upper chain guide and
remove guide.
Place engine on Top Dead Center.
Crank pulley has an O|T mark. The line is TDC.
Cams have groves that should line up to the groves on the forward cam journals.
Remove timing chain tensioner plug.
Plug is 19mm, main housing is 32mm. Either can be removed.
CAUTION:
Timing chain tensioner is under spring pressure, keep inward force on it while unscrewing
it. A small amount of oil will drain out when plug is removed.
Remove the two 10mm nuts and cover from in front of intake
cam.
Bend locking tab back from each of the six cam gear nuts,
remove nuts and locking plate.
Pull intake gear off camshaft, hold chain in position and
lower gear while moving towards exhaust cam to disengage from chain. Lift gear out past
chain
Warning
: Do not rotate crank or camshafts while chain is off.
Remove the 10mm nut and washer locking the idler shaft into
cylinder head.
Thread an appropriate sized slide hammer tool into the end of
the idler shaft and pull shaft from head.
Alternately, thread a 10x1.5 bolt into the end
of the idler shaft and pull while rotating to remove.
Take care to not allow the idler pulley to fall into engine.
Lift idler pulley out of cylinder head.
If replacing bearing only, drive old bearing out of gear and
press new one in.
Installation
Replace and lubricate idler shaft O ring with engine oil.
Ensure that there is no slack in timing chain on left side of
engine.
Rotating exhaust cam slightly toward intake cam will allow
intake cam gear to be installed easier.
CAUTION: Rotate exhaust cam back into position before tightening bolts on intake cam gear.
Replace locking plate for cam gear bolts.
Replace and lubricate O ring on cam gear access cover with
engine oil.
Replace crush rings on timing chain tensioner.
Using a 30mm socket on the crank pulley, rotate engine at
least two full revolutions, ending with the engine at TDC. Check all timing marks.
CAUTION: Failure to double check cam timing could result in severe engine damage.
