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[pic][pic]PATH: Engine Mechanical > Engine Mechanical Components > Timing Chain Cover & Seal > Removal & Installation > 4.8L, 5.3L & 6.0L Engines
4.8L, 5.3L & 6.0L Engines
1. Drain the cooling system.
2. Remove or disconnect the following:
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|Front cover and gasket—4.8L, 5.3L and 6.0L engines |
o Negative battery cable
o Water pump
o Crankshaft balancer from the crankshaft
o Front cover bolts
o Front cover and gasket. Discard the front cover gasket.
o Crankshaft front oil seal from the cover
To install:
|NOTE |
|Do not lubricate the oil seal sealing surface. |
1. Lubricate the outer edge of the oil seal with clean engine oil. Lubricate the front cover oil seal bore with clean engine oil.
2. Install the crankshaft front oil seal with an installer.
|NOTE |
|Do not apply any type of sealant to the front cover gasket (unless specified). Special tools are used to |
|properly align the engine front cover at the oil pan surface and to center the crankshaft front oil seal. |
3. Install the front cover gasket, cover, and bolts onto the engine. Tighten the cover bolts finger–tight. Do not over tighten.
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|J41480 installation—4.8L, 5.3L and 6.0L engines |
4. Start the J41480 tool–to–front cover bolts. Don’t tighten the bolts yet.
|NOTE |
|Align the tapered legs of the tool with the machined alignment surfaces on the front cover. |
5.
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|Seal alignment tool installation—4.8L, 5.3L and 6.0L engines |
6. Install tool J41476 . Install the crankshaft balancer bolt. Tighten the crankshaft balancer bolt by hand until snug. Do not over tighten. Tighten the J41480 bolts and front cover bolts to 18 ft. lbs. (25 Nm).
7. Remove the tools.
8. Install the used crankshaft balancer bolt and tighten to 240 ft. lbs. (330 Nm).
9. Remove the used bolt.
|NOTE |
|The nose of the crankshaft should be recessed 0.094–0.176 in (2.4–4.48 mm) into the balancer bore. |
10. Install a NEW crankshaft balancer bolt and tighten to 37 ft. lbs. (50 Nm), then tighten an additional 140 degrees.
11. Place a straight edge across the engine block and front cover oil pan sealing surfaces. Avoid contact with the portion of the gasket that protrudes into the oil pan surface. Insert a feeler gauge between the front cover and the straight edge tool. The cover must be flush with the oil pan surface or no more than 0.02 in. (0.5mm) below flush. If the front cover–to–engine block oil pan surface alignment is not within specifications, repeat the cover alignment procedure. If the correct front cover–to–engine block alignment cannot be obtained, replace the front cover.
12. Snug the oil pan–to–cover bolts in order to position the cover at the pan rail.
13. Tighten the oil pan–to–front cover bolts to 18 ft. lbs. (25 Nm).
14. Tighten the front cover bolts to 18 ft. lbs. (25 Nm).
15. Install the water pump.
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[pic][pic]PATH: Engine Mechanical > Engine Mechanical Components > Timing Chain & Sprockets > Removal & Installation > 4.8L, 5.3L & 6.0L Engines
4.8L, 5.3L & 6.0L Engines
1. Drain the cooling system.
2. Remove or disconnect the following:
o Negative battery cable
o Front cover and gasket. Discard the front cover gasket.
o Oil pump
1. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned.
|NOTE |
|Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the |
|piston assemblies or the valves. |
2. Remove or disconnect the following:
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|Sprocket and chain removal—4.8L, 5.3L and 6.0L engines |
o Camshaft sprocket bolts
o Camshaft sprocket and timing chain
o Crankshaft sprocket
o Crankshaft sprocket key
To install:
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|Crankshaft sprocket installation—4.8L, 5.3L and 6.0L engines |
1. Install or connect the following:
o Key into the crankshaft keyway
o Crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
o Camshaft sprocket and timing chain. Locate the camshaft sprocket alignment mark in the 6 o'clock position.
o Camshaft sprocket bolts and tighten to 26 ft. lbs. (35 Nm)
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|Timing mark alignment—4.8L, 5.3L and 6.0L engines |
1. Install the oil pump and the front cover. Be sure to use a new gasket and oil seal.
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