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HOMESERVICE MANUALSCHEVROLET1986CHEVY VAN G20, 5.0 H, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONENGINEENGINE OVERHAUL PROCEDURES - GENERAL INFORMATIONTIMING CHAINS & BELTSTIMING CHAINS
1986 Chevrolet Chevy Van G20, 5.0 H, Standard

Timing Chains

1986 Chevrolet Chevy Van G20, 5.0 H, StandardSECTION Timing Chains
NOTE:

Examples used in this article are general in nature and do not necessarily relate to a specific engine or system. Illustrations and procedures have been chosen to guide mechanic through engine overhaul process. Descriptions of processes of cleaning, inspection, assembly and machine shop practice are included.

Always refer to appropriate engine overhaul article, if available, in the ENGINES section for complete overhaul procedures and specifications for the vehicle being repaired.

Timing chains will stretch during operation. Limits are placed upon amount of stretch before replacement is required. Timing chain stretch will alter ignition timing and valve timing.

To check timing chain stretch, rotate crankshaft to eliminate slack from one side of timing chain. Mark reference point on cylinder block. Rotate crankshaft in opposite direction to eliminate slack from remaining side of timing chain. Force other side of chain outward and measure distance between reference point and timing chain. See Fig 1. Replace timing chain and gears if not within specification.

Fig 1: Measuring Timing Chain Stretch
G95J14653

Timing chains must be installed so timing marks on camshaft gear and crankshaft gear are aligned according to manufacturer. See Fig 2.

Fig 2: Typical Gear Timing Mark Alignment
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RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.