4.7 engine is an interference motor (1 Viewer)

[dynamohm]

I have seen a few posts on this forum questioning if the 4.7 is an interference motor. Yes it is! I had one of my techs set the valve timing wrong today while replacing a timing belt. Broke all the exhaust valves and cracked the guides. This was on a VVT motor plastic intake manifold. Only VVT motors have them. Still not sure about the older ones with out VVT, but as far as I know VVT only controls the intake cam.

 

[packetstormin]

I believe all 4.7 motors are indeed interference.

 

[1loudLX]

Aren't all the UZ engines interference?

 

[OregonLC]

Aren't all the UZ engines interference?

Yep.

And how a tech could get a cam gear off center is beyond me. Match paint with stripes with marks and you're golden. Not to mention turning it over by hand first.

 

[NKP Garage]

I have seen a few posts on this forum questioning if the 4.7 is an interference motor. Yes it is! I had one of my techs set the valve timing wrong today while replacing a timing belt. Broke all the exhaust valves and cracked the guides. This was on a VVT motor plastic intake manifold. Only VVT motors have them. Still not sure about the older ones with out VVT, but as far as I know VVT only controls the intake cam.

Time to fire that technician

 

[Jap8]

Tell him to roll his swag.

Admittedly, we all seem to learn best by our mistakes, but some mistakes you just can't forgive lol