Removal And Installation
TIMING CHAIN
Removal and Installation
NOTE:
- To remove timing chain and associated parts, start with those on the LH bank. The procedure for removing parts on the RH bank is omitted because it is the same as that for removal on the LH bank.
- To install timing chain and associated parts, start with those on the RH bank. The procedure for installing parts on the LH bank is omitted because it is the same as that for installation on the RH bank.
REMOVAL
1.Remove the timing chain cover. Removal And Installation.
2.Without removing them, loosen the camshaft sprocket bolts.
3.Remove the oil pump drive spacer.
- Hold and remove the flat space of the oil pump drive spacer by pulling it forward.
4.Remove the oil pump. Removal And Installation.
5.Remove the chain tensioner on the LH bank using the following steps.
a.Squeeze the return-proof clip ends using suitable tool and push the plunger into the tensioner body.
b.Secure the plunger using stopper pin.
- Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c.Remove the bolts and chain tensioner.
WARNING:
Plunger, spring, and spring seat pop out when (squeezing)
return-proof clip without holding plunger head. It may cause serious injuries. Always hold plunger head when removing.
NOTE:
- Stop the plunger in the fully extended position by using the return-proof clip (1) if the stopper pin is removed.
- Push the plunger (2) into the tensioner body while squeezing the return-proof clip (1). Secure it using stopper pin (3).
6.Remove the timing chain tension guide and timing chain slack guide.
7.Remove the timing chain and crankshaft sprocket.
8.Loosen the camshaft sprocket bolts using suitable tools as shown (A) and remove the camshaft sprockets.
CAUTION:
To avoid interference between valves and pistons, do not turn crankshaft or camshaft when timing chain is disconnected.
9.Repeat the same procedure to remove the RH timing chain and associated parts.
INSPECTION AFTER REMOVAL
Check for cracks and any excessive wear at link plates. Replace chain if necessary.
- In the same way as for the LH bank, inspect the timing chain and associated parts on the RH bank.
INSTALLATION
NOTE:
- The illustration above shows the relationship between the mating mark on each timing chain and that of the corresponding sprocket, with the components installed.
- To install the timing chain and associated parts, start with those on the RH bank. The procedure for installing parts on the LH bank is omitted because it is the same as that for installation on the RH bank.
1.Make sure the crankshaft key and RH bank camshaft dowel pin and LH bank camshaft dowel pin are facing in the direction shown.
2.Install the camshaft sprockets.
- Install the camshaft sprocket INT (VTC) (A) and camshaft sprockets EXH (B) by selectively using the groove of the dowel pin according to the bank. (Common part used for both exhaust banks.)
NOTE:
Use the groove marked (R) for RH bank and (L) for LH bank.
- Lock the hexagonal part of the camshaft in the same way as for removal, and tighten the bolts.
3.Install the crankshaft sprockets for both banks.
- Install LH bank crankshaft sprocket (B) and RH bank crankshaft sprocket (C) so that their flange side (A) (the larger diameter side without teeth) faces in the direction shown.
NOTE:
The same parts are used but facing directions are different.
4.Install the timing chains and associated parts.
- Align the alignment mark on each sprocket and the timing chain for installation.
CAUTION:
- Before installing timing chain tensioner, it is possible to change the position of alignment mark on timing chain and each sprocket. After the alignment marks are aligned, keep them aligned by holding them by hand.
- Install the slack guides and tension guides onto the correct side by checking the identification mark on the surface.
- Install the timing chain tensioner with the plunger locked in with the stopper pin.
CAUTION:
- Before and after the installation of the timing chain tensioner, make sure that the alignment mark on the timing chain is not out of alignment.
- After installing the timing chain tensioner, remove the stopper pin to release the tensioner.
Make sure the tensioner is released.
- To avoid chain-link skipping of the timing chain, do not move crankshaft or camshafts until the front cover is installed.
5.In the same way as for the RH bank, install the timing chain and associated parts on the LH bank.
6.Install the oil pump.
7.Install the oil pump drive spacer as follows:
- Install so that the front mark on the front edge of the oil pump drive spacer faces the front of the engine.
- Insert the oil pump drive spacer according to the directions of the crankshaft key and the two flat surfaces of the oil pump inner rotor.
- If the positional relationship does not allow the insertion, rotate the oil pump inner rotor to allow the oil pump drive spacer to be inserted.
8.Installation of the remaining components is in the reverse order of removal. Removal And Installation.
INSPECTION AFTER INSTALLATION
- Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required quantity, fill to the specified level.
- Use procedure below to check for fuel leakage.
- Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points.
- Start engine. With engine speed increased, check again for fuel leakage at connection points.
- Run engine to check for unusual noise and vibration.
NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.
- Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids including engine oil and engine coolant.
- Bleed air from passages in lines and hoses, such as in cooling system.
- After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to specified level, if necessary.
- Summary of the inspection items:
