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Timing Belts - Linn–Benton Community...
Transcript of Timing Belts - Linn–Benton Community...
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Timing Belts
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• All timing belts need periodic replacement
• Critical for “Interference” engines
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Some engines are free running or non‐interference
Other engines will have piston strike the valve if timing belt breaks or is improperly installed
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• Timing Belts should be replaced at recommended mileage
• 60,000 – 90,000 miles are common
• Timing belt should be replaced with any signs of wear
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Badly worn – should be replaced even if cracking is very minor
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Teeth can strip and not turn camshaft even if belt does not break
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Check for Coolant and Oil Leaks
• Any coolant or oil on the timing belt will deteriorate the belt and cause early belt failure.
• If timing belt drives the water pump it is best practice to replace both at the same time
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Replace Idlers and Tensionerson High Mileage engines
Timing belt kits are available with all new rotating parts (Tensioners and idler pulleys)
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Check replacement Belt against old one. Not ALL belt teeth are the same style
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Check replacement Belt against old one.
• Count the number of teeth to make sure both belts are the same.
• Mark OLD belt BEFORE removing.
• Mark on EACH pulley
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Count teeth when transferring marks from old belt to new belt
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Read ALL procedures
• Always rotate belt by hand at least 2 revolutions to ensure timing is accurate and to set tensioners.
• Tensioner pre‐load is critical
• NEVER turn in opposite direction – may ruin the tensioner, may cause belt to jump a tooth when engine starts
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Rotate at CrankShaft
• Remove spark plugs
• This allows engine to turn over easier
• (Mark wires as will cause misfire – rough running if plug wires on wrong plugs)
• Rotating from Camshaft will over – torque cam sprocket and may cause this bolt to break!
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Turn This Crankshaft Counter‐Clock Wise
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Tensioners take up slack. Turn so crank pulls on camshaft – NOT the tensioner
Turn This Crankshaft Clock Wise
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Turn This Crankshaft Counter‐Clock Wise
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Turn This Crankshaft Clock Wise
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Turn This Crankshaft Clock Wise
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Read ALL procedures
• Tensioner adjustment is critical and not all adjust the same way
• Some dual camshaft engines use a special holder to prevent the valve springs from turning the camshaft as timing belt is removed
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Double Check Camshaft timing
• If you get off by only one tooth the engine will run smoothly but have VERY low power
• If you are off by more than just a few teeth the engine will not run
• If you are off on cam timing cranking the engine with the starter motor can bend valves!
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Double Check Camshaft timing
• If you are rotating the engine by hand and the crankshaft gets very difficult to turn…….
• ….STOP! – this may be a valve that is contacting the piston
• https://youtu.be/V2ipLYeNad8