Quote:
Originally Posted by maytag
aaaahhhhhh......
So, I can't even picture yet where these scavenge pumps are, and how they sit. I'll have to become more familiar. If one or both are bad, will I see that in a test of the AOS with a manometer?
And I'll definitely be checking the cam positions. Too easy to check to not do it....
Thanks Monty!
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You'll find the scavenge pumps the same place as the cam plugs. The pumps are driven off the exhaust cams. Bank 1 pump is toward the rear and bank 2 is toward the front. They are held on by 4 bolts, replace the bolts with the o-rings.
As far as identifying by manometer, not likely. But what happens if one fails is the head fills with oil and reduces the vapor space allowing oil to be pulled from the head into the vent pipe and into the AOS sump. There are swirl vanes in the sump of the AOS which will centrifuge out small amounts of oil in vapor, but will become overwhelmed by liquid oil from lack of retention time..