Author Topic: AHU bore size (Read 3313 times)

boxer246 · « **on:** February 16, 2008, 06:22:03 pm »

I dont have a Bentley (yet) and cant find a spec sheet anywhere.....can someone please tell me what the new bore size and out-of-spec bore limit is for a AHU? Looking at a motor that is apart and want to see if it is going to need a rebore. The guy said the motor has 225,000 miles, but I tell you the bores looked perfect....hone marks still clearly visible, and no ridge at top of bore was discernable...so who knows. I measured the bore with my crappy T-guage and came up with 3.130".

jimfoo · « **Reply #1 on:** February 16, 2008, 07:05:32 pm »

Bore is 79.5 mm, or 3.13". Looks like you should be good.

MikkiJayne · « **Reply #2 on:** February 17, 2008, 01:09:21 am »

AHUs seem to be pretty much invincible in that respect. Mine had 180K when I tore it apart. The bearings were worn to nothing, but the bores are still perfect. A quick hone and it's good to go

boxer246 · « **Reply #3 on:** February 17, 2008, 02:54:17 pm »

Thanks for the info fellas.