Complete digital official shop manual contains service, maintenance, and troubleshooting information for the Buick Riviera 1980-1999. 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 Riviera 1980-1999 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:
OVERHAUL
CYLINDER HEAD
Inspection
1. Inspect cylinder head for warpage at deck and manifold surfaces. Resurface cylinder head if warpage exceeds specification. See CYLINDER HEAD table under ENGINE SPECIFICATIONS.
2. After resurfacing, use a depth micrometer to measure distance from deck surface to 3 cast pads. See Fig. 16. Replace cylinder head if dimension is less than .044" (1.12 mm). New cylinder head dimension should be .054-.066" (1.37-1.68 mm).
Valve Seats
No replacement procedure is given by manufacturer.
Valve Guides
If valve stem oil clearance is not within specification, ream valve guides for oversize valve stem. See CYLINDER HEAD table under ENGINE
SPECIFICATIONS.
Valve Seat Correction Angles
After grinding, if seat width is too wide, use 20-degree or 70-degree stone to reduce seat width. A 20-degree stone will lower seat. A 70-degree stone will raise seat.
Valve Spring Installed Height
1. Install valve, valve retainer and keepers. Pull upward on valve, and measure height from top of spring seat to spring side of valve retainer. See Fig. 17.
2. Ensure spring installed height is within specification. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS. If measurement exceeds specification, add shims under valve spring to obtain correct height.
Valve Stem Height
With valve installed in cylinder head (closed position), use steel ruler to measure distance from spring seat to valve tip. Distance should be 1.935-1.975" (49.15- 50.17 mm).
Valve Stem Oil Seals
Oversize valve stem oil seals are used for valves with oversize stems. Intake and exhaust valve stem oil seals are different. Install oil seal according to part number and package instructions.
Fig. 16: Measuring Cylinder Head Thickness
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