blue oil pump o ring
I disassembled mine so that I could center the oil pump to the crank using two .002 feeler gauges . The oil pump is actually quite simple to disassemble and reassemble. If you take it apart I would mark the edges of the gerotor gears that face outward with a sharpie pen as it is important that they be reinstalled in this manner . I really think you are worrying yourself too much on this . Did you do what I sugested in my last post ? I am sure you will be fine . If you take your pump apart, lube everything up with some engine assembly lube or at least some motor oil . Now go check that o-ring and put that thing back together LOL .
Since you have a spare o-ring, lube it up good and try it with the old pump.
Not sure if you measured, but you need to determine if a change was made to the pump opening on the LS2 pump, I doubt it though.
If you are assembling dry, it will pop off.
Not sure if you measured, but you need to determine if a change was made to the pump opening on the LS2 pump, I doubt it though.
If you are assembling dry, it will pop off.
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
I don't know if I put it in the same direction that I took it out...didn't look like in mattered. I did take apart the old pump and notice a circular notch on the outside face of the outer gear. So I put the new one in with this facing out as well. If it isn't put together the same side facing out any reason I should worry? Please tell me now as I can hop in the car and go pick up a new pump....chalk it up to a $150 mistake.
Should I apply locktite to the pump cover bolts? What is the torque specs on that?
Should I apply locktite to the pump cover bolts? What is the torque specs on that?
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
I disassembled mine so that I could center the oil pump to the crank using two .002 feeler gauges . The oil pump is actually quite simple to disassemble and reassemble. If you take it apart I would mark the edges of the gerotor gears that face outward with a sharpie pen as it is important that they be reinstalled in this manner . I really think you are worrying yourself too much on this . Did you do what I sugested in my last post ? I am sure you will be fine . If you take your pump apart, lube everything up with some engine assembly lube or at least some motor oil . Now go check that o-ring and put that thing back together LOL .
So it is important to be absolutely certain to reinstall the gears in the same direction. Out $150 fantastic!!!! The wife is going to love this!! Should of warned me about that before I took it out....crap! https://ls1tech.com/forums/generation-iii-internal-engine/835863-oil-pump-porting-how.html
The only oil pump gear that has specific direction is the outer gear. It has a small round dot on the side that faces the pump plate. You can also tell by looking at the outer edge on both sides of the outer gear. One side is chamfered and one side is a 90 degree corner. The chamfered edge goes down into the pump body.
The inside gear can face either direction, it doesn't matter.
Yep , he beat me to the link , but thats it . Just relax, you are going to give yourself a heart attack , LOL . Basically the outer gear has a dimple on the outer face and the inner gear really doesn't matter . Torque the oil pump plate bolts to 106 inch pounds and use a little blue loctite on them , the pump body bolts get tightened to 18 foot pounds . 
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
Take a look at this thread and download the document. It explains exactly what your worried about. No big deal.
https://ls1tech.com/forums/showthread.php?t=835863
The only oil pump gear that has specific direction is the outer gear. It has a small round dot on the side that faces the pump plate. You can also tell by looking at the outer edge on both sides of the outer gear. One side is chamfered and one side is a 90 degree corner. The chamfered edge goes down into the pump body.
The inside gear can face either direction, it doesn't matter.
https://ls1tech.com/forums/showthread.php?t=835863
The only oil pump gear that has specific direction is the outer gear. It has a small round dot on the side that faces the pump plate. You can also tell by looking at the outer edge on both sides of the outer gear. One side is chamfered and one side is a 90 degree corner. The chamfered edge goes down into the pump body.
The inside gear can face either direction, it doesn't matter.
BTW, the dot on my "LS2" pump isn't round, it's square. I'm going to go ahead and install the LS6 pump, I think. The "new" LS2 pump I received came in an open box and had a little oil on the pickup mount. At this point I have zero confidence that this pump is actually an LS2 pump. The ls6 pump appears to be a better pump anyway...higher pressure than the LS2. LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Link (pdf) appears to be dead. BTW, the dot on my "LS2" pump isn't round, it's square. I'm going to go ahead and install the LS6 pump, I think. The "new" LS2 pump I received came in an open box and had a little oil on the pickup mount. At this point I have zero confidence that this pump is actually an LS2 pump. The ls6 pump appears to be a better pump anyway...higher pressure than the LS2.
BTW, the dot on my "LS2" pump isn't round, it's square. I'm going to go ahead and install the LS6 pump, I think. The "new" LS2 pump I received came in an open box and had a little oil on the pickup mount. At this point I have zero confidence that this pump is actually an LS2 pump. The ls6 pump appears to be a better pump anyway...higher pressure than the LS2.What part number are you referring to as an LS2 pump?
The LS2 pump is the same as the LS6 pump, they both have the same pressure relief setting.
The dimple on your outer gear is square?
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
I'll put the LS2 pump back together the way you described. I'll have it for sale on the forum and ebay cheap, but it's not going on my car. Live and learn I guess. The LS2 chain seems to fit great...I'm happy about that. I spoke with a mechanic down at the dealer and he recommended against the LS2 pump on an LS1 application. He didn't really elaborate and I didn't pump him for info...just thought I'd throw that out there.
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
Link worked perfect for me, it's a big file (~6MB) so it may take a short while to download depending on your internet connection speed.
What part number are you referring to as an LS2 pump?
The LS2 pump is the same as the LS6 pump, they both have the same pressure relief setting.
The dimple on your outer gear is square?
What part number are you referring to as an LS2 pump?
The LS2 pump is the same as the LS6 pump, they both have the same pressure relief setting.
The dimple on your outer gear is square?
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
Link worked perfect for me, it's a big file (~6MB) so it may take a short while to download depending on your internet connection speed.
What part number are you referring to as an LS2 pump?
The LS2 pump is the same as the LS6 pump, they both have the same pressure relief setting.
The dimple on your outer gear is square?
What part number are you referring to as an LS2 pump?
The LS2 pump is the same as the LS6 pump, they both have the same pressure relief setting.
The dimple on your outer gear is square?
LS2 part number: 17801830
LS6 part number: 12586665
Ahh maybe that is my problem. 17801830 is NOT an LS2 pump its a "special" LS high volume oil pump.
I'll put the LS2 pump back together the way you described. I'll have it for sale on the forum and ebay cheap, but it's not going on my car. Live and learn I guess. The LS2 chain seems to fit great...I'm happy about that. I spoke with a mechanic down at the dealer and he recommended against the LS2 pump on an LS1 application. He didn't really elaborate and I didn't pump him for info...just thought I'd throw that out there.
Since this 'so called' LS2 oil pump is a total POS, I'll gladly take it off your hands for $20 plus shipping.
I have the 17801830 oil pump in my car with over 5,000 miles and no issues.
Last edited by 405HP_Z06; Apr 26, 2008 at 02:29 PM.
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
Uh, yea I would not listen to anything this person has to say. GM part number 17801830 IS an LS6 pump. The only difference is the part number. The pictures of the oil pump in the .PDF above is the 17801830 oil pump. I bet the two pumps you have bare a striking resemblance. See the image below from the 2008 GM High Performance parts catalog.
Since this 'so called' LS2 oil pump is a total POS, I'll gladly take it off your hands for $20 plus shipping.
I have the 17801830 oil pump in my car with over 5,000 miles and no issues.
Since this 'so called' LS2 oil pump is a total POS, I'll gladly take it off your hands for $20 plus shipping.
I have the 17801830 oil pump in my car with over 5,000 miles and no issues.
I usually don't listen or trust mechanics (aka parts changers). Yeah they both have the same part number on the pump....hmmm why is the LS6 version more expensive?
$20? Then we agree, the part is a POS.
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
Same problem with the new pump. This pickup does not "snap" into place. I can "seat" it with minimal effort but when I let go it wants to push away. Does anybody remember this being the case? Taking the pump apart to see what it looks like on the inside is a bit of a waist of time as you can't possibly see the o r-ring from the inside.
When I tighten down the pickup tube it does seem to pull nicely into place, is this what you all do?
When I tighten down the pickup tube it does seem to pull nicely into place, is this what you all do?
I don't think so, but from your comment "I'll have it for sale on the forum and ebay cheap, but it's not going on my car." I took this to mean you found it to be.
Same problem with the new pump. This pickup does not "snap" into place. I can "seat" it with minimal effort but when I let go it wants to push away. Does anybody remember this being the case? Taking the pump apart to see what it looks like on the inside is a bit of a waist of time as you can't possibly see the o r-ring from the inside.
When I tighten down the pickup tube it does seem to pull nicely into place, is this what you all do?
When I tighten down the pickup tube it does seem to pull nicely into place, is this what you all do?
Here's a picture of how to properly align the pump body on the oil pump drive.
Last edited by 405HP_Z06; Apr 26, 2008 at 03:47 PM.
Thread Starter
On The Tree
Joined: Jun 2007
Posts: 177
Likes: 0
How does this sound?
With the old o ring the pick up tube "snaps" right into place. I hear that there may have been leaking issues with the smaller o ring but can I have confidence that with the blue o ring it will seal at all when it fits like this? I need help!!! This is holding up the whole show.
This is holding up the whole show.Bill