In a message dated 8/16/02 4:17:31 PM Pacific Daylight Time,
jaboruch@netzero.com writes:
<< Pump rotor that failed. The shaft up to the gear is fine. It broke
at the slots on the top. Someone previously had noted that theirs
broke due to the pin that attaches the rotor to the shaft worked its
way out, but that was not the problem with mine.
>>
Now that oil pumps are back in the FOT news, I am looking for opinions. I
pulled my several pumps off of the shelf, and tried to determine which were
good and which might not be so good. Two of them were bound up and obviously
came out of engine explosions.
Using a distributor drive shaft, some of the other pumps were free turning by
hand throughout the entire 360 degrees. Others would have a small amount of
resistance at one spot, where the rotor lobes would be the closest together.
Which situation is the better?
Putting a distributor drive shaft in an electric drill (1/2" and capable of
running in reverse), I spun all of these oil pumps with a small amount of oil
in their suction side. They all spurted a little oil up through their
discharge hole.
There is not much to read about oil pumps in both the TR-2/3 Red Book or the
TR-4 Gray Book, except that they are supposed to be good for 200,000 miles.
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