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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 05-06-2016
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3.0

Is the 99 3.0 a non interference motor?
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Old 05-06-2016
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Ford Rangers all/only used the 3.0l OHV VULCAN engine, V6 non-interference engine.

Ford also used a 3.0l DOHC DURATEC engine which IS an interference V6 engine, but never used it in a Ranger.

Either was available in a 1999 Ford vehicle.

So..."Is the 99 3.0 a non interference motor?"

For a Ranger , yes, 99 Ranger 3.0l is a non-interference motor
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Old 05-06-2016
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Thanks for the information. Seems like a bad design. To make a "interference" engine.
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Old 05-06-2016
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Better design actually.
More efficient and higher compression can be achieved.

Larger valves are almost always interference engines, because of the size of the valves, the newer 4 valve cylinders can go either way.

Timing chains rarely break, and most interference engines use chains, not all however.
Just like most engines that use timing belts are non-interference, but not all.

The old flat head engines were non-interference, as soon as OHV(over head valves) were used is when the term interference engine came into being.
But the combustion and power were worth the effort for OHV.

Pretty much any racing engine will be interference type, to squeeze every last bit of power out.

But for product engines really no reason to run interference type, power isn't needed to that extreme, but also no reason not to run interference type engines.
As far as the reasons for a blown up engine in a production vehicle go, broken timing chain would be way way down on the list.
Spun bearings would be more common for engine rebuild
Head gaskets and burn valves don't require complete rebuild, and quite often if chain does break only a few of the valves are damaged, and pistons and heads are OK so just top end work needed, and new timing chain, lol.
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