4.0 V6 ?

[Kestral]

I was wondering about the 4.0 R51 V6 in my 2012 Pathfinder. Were there many changes made to the 4.0 from 2005-2012 with the V6 in the R51? Things like cams, pistons, rods, water pump etc? I know they improved the timing chain and plastic guide runners but other then that?

[disallow]

Nothing I'm aware of. The engine is a beast!

I've not had the issue with the timing chain in my 05 either, that I am aware of anyways. We purchased in Aug of 2007 at 100k km, so perhaps it was done already.

[smj999smj]

The mechanics are pretty much the same through all them years. The updated chains came out in the 2011 model year. There was a slight drop in horsepower from 2007 to 2008, but I'm not sure why? May different cam profile or different software programming; I guess one could look up the cam part numbers and check if they were that interested? My 2008 SE gets a little better gas mileage than my 2006 LE. In 2008, they started using NGK OE Iridium spark plugs instead of the NGK Laser platinums, but they are interchangeable.