Complete digital official shop manual contains service, maintenance, and troubleshooting information for the Buick LeSabre 1977-2005. Diagnostic and repair procedures are covered in great detail to repair, maintain, rebuild, refurbish or restore your vehicle like a professional mechanic in local service/repair workshop. This cost-effective quality manual is 100% complete and intact as should be without any missing pages. It is the same factory shop manual used by dealers that guaranteed to be fully functional to save your precious time.

This manual for Buick LeSabre 1977-2005 is divided into different sections. Each section covers a specific component or system and, in addition to the standard service procedures, includes disassembling, inspecting, and assembling instructions. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. It is in the cross-platform PDF document format so that it works like a charm on all kinds of devices. You do not need to be skilled with a computer to use the manual.

EXCERPT:
2005 ENGINE Engine Mechanical - 3.8L - LeSabre
Oil Filter Adapter and Bypass Valve Assembly Replacement
Tools Required
J 45059 Torque Angle Meter. See Special Tools.
J 41712 Oil Pressure Switch Socket. See Special Tools.
Removal Procedure
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Fig. 74: Removing/Installing Engine Oil Pressure Switch
2. Disconnect the electrical connector from the engine oil pressure switch (1).
3. Remove the engine oil pressure switch (1) from the oil filter adapter using the J 41712 . See Special Tools.
Fig. 75: Identifying Oil Filter Location
4. Remove the oil filter.
Fig. 76: Removing/Installing Oil Filter Adapter Bolts
5. Remove the 3 oil filter adapter bolts from the engine front cover.
6. Remove the following components:
1. The oil filter adapter.
2. The oil filter adapter gasket.
3. The oil pressure relief valve.
4. The oil pressure relief valve spring.
7. Clean all parts in a suitable solvent and allow to dry.
8. Inspect the following components:
Oil pressure valve for burrs
Valve bore for burrs
Valve spring for loss of tension
Installation Procedure
Fig. 77: Removing/Installing Oil Filter Adapter Bolts
1. Install the spring into the engine front cover.
2. Install the oil pressure valve into the engine front cover.
3. Install a new oil filter adapter gasket.
4. Install the oil filter adapter.
5. Install the oil filter adapter bolts.
Tighten: Tighten the oil filter adapter bolts to 15 N.m (11 lb ft). Use the J 45059 to tighten the oil filter adapter bolts an additional 50 degrees. See Special Tools.
Fig. 78: Identifying Oil Filter Location
6. Lightly oil the replacement oil filter gasket with clean oil.
7. Install the new oil filter.
Tighten: Tighten the new oil filter to 3/4 to 1 full turn, after the oil filter gasket contacts the oil filter mounting surface.
Fig. 79: Removing/Installing Engine Oil Pressure Switch
8. Install the engine oil pressure switch (1) to the oil filter adapter using the J 41712 . See Special Tools.
Tighten: Tighten the engine oil pressure switch to 16 N.m (12 lb ft).
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