oil pump o ring
That damn "o"-ring has caused many a problem. You can install a bolt on that side as well. Here's a pic. You want to use a little larger plain washer to trap the pick-up tube flange & a lock washer to ensure she won't come loose. This way, there is no doubt about the seal. Just make absolutely sure that the "o"-ring isn't pinched & has completely entered the bore.
In reference to your question about the "o"-ring sticking out of the bore on one side; it should not.
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Yah, that's your best bet. Just make sure that the "O-"ring is completely in the bore (not sticking out anywhere) before you add the second bolt.


