The pistons are hitting exhaust valves, does this mean my timming is wrong

1992 ISUZU TRUCK
100,000 MILES
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TANAKAD
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my problem is that the pistons are hittin exhaust valves. Does this mean my timing is wrong. There is a gear attached to campshaft, on that gear there is a white marking. Doe the mark has to face east or west. Please help
Nov 13, 2011 at 2:07 PM
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FIXITMR
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yes, timing is wrong. how did this happen?
Nov 13, 2011 at 2:47 PM