Necessary equipment
EN-48250 Crankshaft Front Oil Seal Installer
Removal procedure
1. Disconnect the negative battery cable.
2. Remove the decorative cover. See "Decorative cover" in this section.
3. Remove the air intake hoses and ducts. See "Air injection system" in this section.
4. Remove the auxiliary belt. See "Accessory Drive Belt and Tensioner" in this section.
5. Remove the engine mount damper block. See "Engine mount assembly (right side)" in this section.
6. Drain the engine oil.
7. Remove the timing belt. See "Timing Belt Drive System" in this section.
8. Remove the timing belt tension roller.
9. Remove the injection pump sprocket.
10. Remove the rear timing belt cover.
11. Remove the crankshaft sprocket.
12. Disconnect the engine oil pressure sensor connector.
13. Disconnect the engine cooling system oil cooler inlet/outlet hoses. See "Engine Oil Filter and Radiator" in this section.
14. Remove the engine oil pump assembly.
Cleaning procedure
1. Clean the sealing surface of the oil pump.
2. Clean the sealing surface of the cylinder block.
3. Clean the oil pump tie bolts.
4. Clean the oil pump bolt holes.
Installation procedure
Important: When changing the engine oil, reset the engine oil service before changing using a diagnostic tool.
1. Apply sealant (LOCTITE 5900) on the sealing surface of the oil pump.
2. Install the oil pump assembly with a new oil pump seal.
3. Install the crankshaft front oil seal using the EN-48250 crankshaft front oil seal installer (a).
Note: If the front crankshaft oil seal is damaged, it must be replaced with a new one. When installing the front crankshaft oil seal on the oil pump, make sure that the groove of the oil seal faces the contact direction of the oil pump housing.
Tighten
Tighten the oil pump clamp bolts to 24 Nm (17.7 ft·lbs).
4. Install the rear timing belt cover.
5. Install the injection pump sprocket.
6. Install the timing belt tensioner roller.
Tighten
Tighten the rear timing belt cover bolts to 11 N·m (97.4 lbs.in).
Tighten the injection pump sprocket nut to 70 Nm (51.6 lbs.in).
Tighten the timing belt tensioner pulley locking bolt to 52 Nm (38.4 lbs.in).
7. Install the crankshaft sprocket.
Tighten
Tighten the crankshaft sprocket nut to 235 N·m (173.3 ft·lbs).
(The article was borrowed from the website «CHEVYMAN»)