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I've always attributed HP oil failures to the high pressure oil pump pulsations caused by the HPOP. If they would have put a big accumulator of some sort in these engines, failures would drop dramatically, in my opinion. They "tried" to put in an accumulator in all of these engines by using oversized galleys that would trap air, absorbing some of the pulsations.

 

The '05 up pump is a 4 piston V style pump. The older pump uses a 7 piston swash plate design. Less pistons, more pulsations. More pulsations, more HP failures. /forums/images/%%GRAEMLIN_URL%%/surprise.gif

 

Side note: the '04 round pump looks like the '03 pump but it's a different PN. I think I remember reading somewhere it has more volume than the '03 pump.

 

Larry, what's the difference between a 3C3Z-9A543-AARM and a 4C3Z-9A543-AARM? Any idea? Are they the same visually? Anybody?

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