4.0 V6 questions

Asked by Jan 07, 2016 at 11:11 AM about the 2006 Ford Mustang

Question type: Maintenance & Repair

I was an engine builder years ago, way before the automakers decided to screw up our cars with all this computer crap and interference piston/valve train designs.

That said, with the 2006 Ford V6 is this this an interference-type engine? That is to say - if you bow a timing chain will the piston hit the valves and trash the head?

I just bought one that's not running and need a place to start looking, if it has spark and is getting fuel. but still won't run.

Thanks.

2 Answers

43,205

So yes the 4.0 is an interference engine and you probably have bent valves. From what I have read, might as well rebuild the hole thing. Timing chain issues from original have now ben upgraded. But it sounds like the motor is a piece of crap. Not durable.

5,035

Yes it is an interference engine and most likely if it got out of time, your valves were damaged. This particular engine has a timing chain in the back of the engine head (passanger side) that forces you to pull the engine out just to do timing chain replacement. This engine has a total of 5 timing chains and complicated to replace without special tools

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