REMOVAL & INSTALLATION
Procedures applying to removal and installation of the auxiliary shaft drive chains are located under Auxiliary (Intermediate or Silent) Shafts Removal and Installation, later in this section.2.5L Premier Engine
See Figures 1 through 5
- Disconnect the negative battery cable.
- Remove the fan shroud and cooling fan, as described earlier in this section.
- Remove the accessory drive belts. For more information, refer to Routine Maintenance .
- Remove the water pump pulley and crankshaft vibration damper, as described earlier in this section.
- Remove the timing case cover, as described previously in this section.
It is a good practice to either remove or cover the radiator area when performing extensive repairs to the engine to prevent accidental damage to the radiator core.
- Rotate the crankshaft until the 0 timing mark on the crankshaft sprocket is closest to and on a center line with the timing mark on the camshaft sprocket.
- Remove the oil slinger from the crankshaft.
- Remove the camshaft retaining bolt and remove the sprockets and chain as an assembly.
- If the timing chain tensioner is to be replaced, the oil pan must also be removed.
- Turn the tensioner lever to the unlock (down) position and pull the tensioner block toward the tensioner lever to compress the spring. Hold the block and turn the tensioner lever to the lock (up) position.
- Install the crankshaft sprocket, camshaft sprocket and timing chain together. Make sure the timing marks are aligned as indicated in Step 6 and in the accompanying illustration.
- Install the camshaft sprocket retaining bolt and washer. Tighten the bolt to 80 ft. lbs. (108 Nm).
- To verify correct installation of the timing chain, rotate the crankshaft until the camshaft sprocket timing mark is approximately at the 1 o'clock position. Count the number of chain link pins between the camshaft timing mark and the crankshaft timing mark, there should be 20 pins (2 per link) between the marks.
- Make sure that the timing chain tensioner switches to the unlocked position. If the tensioner does not switch automatically unlock, switch it manually to the unlock position.
- Install the oil slinger.
- Install the timing case cover, as described earlier in this section.
- Install the water pump pulley and crankshaft vibration damper, as described earlier in this section.
- Install and properly tension the accessory drive belts. For more information, refer to Routine Maintenance .
- Install the fan shroud and cooling fan, as described earlier in this section.
- Connect the negative battery cable, start the engine and check for leaks.
See Figures 6 through 10
All 2.6 engines are equipped with 2 silent shafts which cancel the vertical vibrating force of the engine and the secondary vibrating forces, which include the sideways rocking of the engine due to the turning direction of the crankshaft and other rolling parts. The shafts are driven by a duplex chain and are turned by the crankshaft. The silent shaft chain assembly is mounted in front of the timing chain assembly and must be removed to service the timing chain. Because of the inter-relatedness of the timing chains, silent shafts and oil pump all of these components are covered under this one procedure.
- Disconnect the negative battery terminal.
- Remove the timing chain cover, as described earlier in this section.
- Remove the silent shaft chain guides, side A , top B , bottom C , from the silent shaft B chain.
- Remove the sprocket bolts from the silent shaft sprockets.
- Remove the crankshaft sprocket, silent shaft sprockets and the outer chain from the engine.
- Remove the camshaft sprocket bolt, then remove the distributor drive gear.
- Remove the camshaft sprocket holder and right and left timing chain guides.
- Depress the tensioner to remove the timing chain and remove the crankshaft and camshaft sprockets.
Clean all components of old oil, grime and gasket material with a suitable solvent. Inspect the components as follows:
- Inspect the silent chain guides, the chain tensioner rubber shoe, and the sprocket teeth for damage or excessive wear.
- Check the chain tensioner spring for deterioration. The free length of the spring should be 2.587 in. (65.7mm) and the load should be 4.4 lbs. (19.6 N) at 1.453 in. (36.9mm).
- Inspect the silent shaft sprocket cushion ring for free and smooth rotation.
- Inspect the silent shaft sprocket cushion ring and ring guide for damage.
- Check the silent shaft chain for roller play, wear, damage, disconnected links, etc.
- Lubricate the silent shaft chain and the timing chain with clean, new engine oil.
- With the camshaft bearing caps tightened down (in case the camshaft was removed), rotate the camshaft so that the dowel hole is on the vertical centerline (12 o'clock position).
- Install the sprocket holder and the right and left chain guides.
- Rotate the crankshaft until the No. 1 piston is at TDC (since the camshaft is already correctly positioned, this will automatically bring the engine in position so that the No. 1 piston is at TDC on its compression stroke, which is exactly what you want).
- Install the tensioner spring and shoe on the oil pump body.
- Install the timing chain on the camshaft and crankshaft sprockets. Make sure that the timing marks are aligned. The timing marks on the sprockets are the punch marks on the teeth, while those on the chain are the plated links (different color from the regular links).
- Holding the sprockets and chain assembled as in Step 14 with both hands, align the crankshaft sprocket to the crankshaft keyway and slide it into place. Align the camshaft sprocket dowel hole to the camshaft dowel hole, then slide the camshaft sprocket onto the camshaft.
The sprocket timing mark and the plated chain link should be at the 2 to 3 o'clock position when correctly installed.
- Install to dowel pin and install the distributor drive gear. Install the sprocket bolt on the camshaft and tighten it to 40 ft. lbs. (54 Nm).
- Install the silent shaft chain drive pulley onto the crankshaft.
- Install the silent shaft chain onto the oil pump sprocket and onto the silent shaft sprocket. Make sure that the timing marks are aligned. The timing marks on the sprockets are the punch marks on the teeth while those on the chain are are the plated links.
- Holding the parts assembled in Step 18 with both hands, align the crankshaft sprocket plated link with the punch mark on the sprocket.
- With the chain installed on the crankshaft sprocket, install the oil pump sprocket and silent shaft chain sprocket on their respective shafts.
- Install the oil pump and silent shaft sprocket bolts and tighten them to 25 ft. lbs. (34 Nm).
- Loosely install the 3 chain guides.
Adjust the silent shaft chain tension, as follows:
- Tighten chain guide A mounting bolts to 13 ft. lbs. (18 Nm).
- Tighten chain guide C mounting bolts to 13 ft. lbs. (18 Nm).
- Shake the oil pump and silent shaft sprockets to collect chain slack at point P .
- Adjust the position of chain guide B so that when the chain is pulled in the direction of arrow F with your finger tips, the clearance between chain guide B and the chain links will be between 0.04-0.14 in. (1.0-3.5mm). Tighten chain guide B mounting bolts to 13 ft. lbs. (18 Nm).
- Install the timing chain cover, as described earlier in this section.
- Connect the negative battery cable.
See Figure 11
The timing chain can be adjusted on the 2.6L engine without removing the timing chain cover, as follows:
- Remove the cover on the access hole in the chain case cover.
- Loosen Special Bolt B .
- Apply finger pressure on the boss, as shown in the accompanying illustration. Do NOT use a prytool or other implement to apply tension.
- Tighten Special Bolt B to 13 ft. lbs. (18 Nm).