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Ford Ranger Timing Belt

My son-in-laws 89 Ford ranger, 4 cyl., timing belt broke. He replaced it and now says it doesn't run well .I am driving up North to help him check it out. Can someone answer these questions:
1. Is it an interference engine.
2. If so, where would the most likely damage be: valves, piston, or lower end?
1. Is it an interference engine.
2. If so, where would the most likely damage be: valves, piston, or lower end?
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Comments
I'd do a compression test and vacuum leak test for starters, and also check his cam timing marks.
I'm just guessing on the interference issue, I don't have the specs on this truck.
Usually on breakage of a belt with an interference fit, the valves are bent immediately.
Let us know if you got it fixed and what it was when you get back.