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=====''Timing Chain and Belts - tension adjustment, gear backlash, runout, etc.''=====
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=====''TIMING GEARS''=====
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=====''Timing Chain and Belts - tension adjustment, gear backlash, runout, etc.''=====
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=====''Timing Chain and Belts - tension adjustment, gear backlash, runout, etc.''=====
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=====''TIMING CHAINS & BELTS''=====
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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. Replace timing chain and gears if not within specification. [[http://www.garage411.com/images/GeneralAuto/TimingChainStretch.gif See Figure]].
On engines where [[Camshaft camshaft]] gear operates directly on crankshaft gear, gear backlash and runout must be checked. To check backlash, install dial indicator with tip resting on tooth of camshaft gear. Rotate camshaft gear as far as possible. Adjust indicator to zero. Rotate camshaft gear in opposite direction as far as possible and note reading.
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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. 23 . Replace timing chain and gears if not within specification. [[http://www.garage411.com/images/GeneralAuto/TimingChainStretch.gif See Figure]].
On engines where camshaft gear operates directly on crankshaft gear, gear backlash and runout must be checked. To check backlash, install dial indicator with tip resting on tooth of camshaft gear. Rotate camshaft gear as far as possible. Adjust indicator to zero. Rotate camshaft gear in opposite direction as far as possible and note reading.
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=====''TIMING GEARS''=====
==''TIMING GEAR BACKLASH & RUNOUT''==
On engines where camshaft gear operates directly on crankshaft gear, gear backlash and runout must be checked. To check backlash, install dial indicator with tip resting on tooth of camshaft gear. Rotate camshaft gear as far as possible. Adjust indicator to zero. Rotate camshaft gear in opposite direction as far as possible and note reading.
To determine timing gear runout, mount dial indicator with tip resting on face edge of camshaft gear. Adjust indicator to zero. Rotate camshaft gear 360 degrees and note reading. If backlash or runout exceeds specification, replace camshaft and/or crankshaft gear.
==''REAR MAIN OIL SEAL INSTALLATION''==
''One-Piece Type Seal''
For one-piece type oil seal installation, coat block contact surface of seal with sealer if seal is not factory coated. Ensure seal surface is free of burrs. Lubricate seal lip with engine oil and press seal into place using proper oil seal installer.
''Rope Type Seal''
For rope type rear main oil seal installation, press seal lightly into seat area. Using seal installer, fully seat seal in bearing cap or cylinder block.
Trim seal ends even with cylinder block parting surface. Some applications require sealer to be applied on main bearing cap before installing.
''Split-Rubber Type Seal''
Follow manufacturer's procedures when installing split-rubber type rear main oil seals. Installation procedures vary with manufacturer and engine type. [[http://www.garage411.com/images/GeneralAuto/InstallRubberSeal.gif See Figure]]