GM Firebird 1967-1981 Repair Guide

Timing Belts

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INSPECTION



See Figures 1 through 9

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Fig. Fig. 1: Do not bend, twist or turn the timing belt inside out. Never allow oil, water or steam to contact the belt



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Fig. Fig. 2: Check for premature parting of the belt



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Fig. Fig. 3: Check if the teeth are cracked or damaged



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Fig. Fig. 4: Inspect the timing belt for cracks, fraying, glazing or damage of any kind



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Fig. Fig. 5: Look for noticeable cracks or wear on the belt face



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Fig. Fig. 6: You may only have damage on one side of the belt; if so, the guide could be the culprit



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Fig. Fig. 7: Foreign materials can get in between the teeth and cause damage



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Fig. Fig. 8: Damage on only one side of the timing belt may indicate a faulty guide



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Fig. Fig. 9: ALWAYS replace the timing belt at the interval specified by the manufacturer

The only two engines covered in the guide equipped with timing belts are the 1967 Overhead Camshaft (OHC) 230 and 1967-69 OHC 250 engines. Inspect the timing belt on these engines every 30,000 miles for damage, and replace the belt with a new one at 60,000 miles. Inspect both sides of the timing belt. Replace the belt with a new one if any of the following conditions are evident:



Hardening of black rubber backside is glossy without resilience and leaves no indent when pressed with a fingernail.
 
Cracks on rubber backing
 
Cracks or peeling of the canvas
 
Cracks on rib base
 
Cracks on belt sides
 
Missing teeth
 
Abnormal wear of the belt sides. The sides are normal if they are sharp as if cut by a knife.
 

If none of these conditions is evident, the belt does not need replacement, unless it is the 60,000 mile service check. The belt MUST be replaced at this interval.

For removal and installation procedures, please refer to Engine And Engine Overhaul .

 
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