oil pump gear orientation
Thread Starter
Racer
Joined: Sep 2009
Posts: 460
Likes: 6
From: Houston
oil pump gear orientation
I am installing my melling oil pump and I was wondering if they slot in the driven gear needs to be oriented with the keyway? I was thinking 180 from the key or maybe it doesn't matter. Why is this slot there anyway? Also this isn't my pic, just borrowed it, I have the newer 10296 w/ countersunk cover.
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
The slot is there for orientation during automated pump assemble of the rotor to stator. Though I don't believe it matters, some will line the slot up with the keyway thinking that this is the best location for overall balance. There might be a slight mass difference to compensate for the mass of the key. Again, I don't believe it makes any difference in balance at this small of a radius.
All the engine manual says about it:
1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
All the engine manual says about it:
1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
Last edited by Eric D; Dec 29, 2011 at 03:49 PM.
Thread Starter
Racer
Joined: Sep 2009
Posts: 460
Likes: 6
From: Houston
The slot is there for orientation during automated pump assemble of the rotor to stator. Though I don't believe it matters, some will line the slot up with the keyway thinking that this is the best location for overall balance. There might be a slight mass difference to compensate for the mass of the key. Again, I don't believe it makes any difference in balance at this small of a radius.
All the engine manual says about it:
1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
All the engine manual says about it:
1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
