View Poll Results: LPOP Changed or NOT, and @ what mileage?
Changed @ 100K-200K miles
3
8.82%
Changed @ 201K-300K miles
2
5.88%
Changed @ 301K-400K miles
1
2.94%
Changed @ >400K miles
0
0%
NOT changed and am @ 100K-200K miles
13
38.24%
NOT changed and am @ 201K-300K miles
6
17.65%
NOT changed and am @ 301K-400K miles
6
17.65%
NOT changed and am @ >400K
3
8.82%
Multiple Choice Poll. Voters: 34. You may not vote on this poll
LPOP life expectancy? Post your experience.
Thread Starter
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Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
LPOP life expectancy? Post your experience.
I'm getting ready to replace my water pump. The current pump has something akin to 150,000+ miles on it, as did the OEM unit it replaced, and is a rebuilt unit from Advance Auto which I installed some 9-10 years ago. It's had a good life, but is oozing from the weep hole, so I'll replace it proactively before it fails catastrophically on some narrow county road with no shoulder between my house and the plant.
Here's my question for the poll.
The truck now has almost 310,000 miles on it, and I'm going to be all the way in to the front cover while doing this work, and I'm wondering about the LPOP. Is there some "rule of thumb" or "typical" point of failure for our stock LPOP's? 200,000 miles, 300,000 miles, 400,000 miles, etc.?
For those of you who have replaced your LPOP, at what mileage did you do so?
Even for those who have NEVER replaced the LPOP, let me know what mileage point you are currently at as well so I can get a more complete perspective on LPOP life expectancy.
Here's my question for the poll.
The truck now has almost 310,000 miles on it, and I'm going to be all the way in to the front cover while doing this work, and I'm wondering about the LPOP. Is there some "rule of thumb" or "typical" point of failure for our stock LPOP's? 200,000 miles, 300,000 miles, 400,000 miles, etc.?
For those of you who have replaced your LPOP, at what mileage did you do so?
Even for those who have NEVER replaced the LPOP, let me know what mileage point you are currently at as well so I can get a more complete perspective on LPOP life expectancy.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
If you are not experiencing any problems I would forget about looking at it. What's going to happen is you are going to remove the low pressure oil pump and see the condition of the front cover and wish you hadn't. Then you will be replacing a front cover just because you are now aware that it "looks bad"........
Thread Starter
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Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
So, what are the symptoms of a weak, tired, or failing LPOP?
I've just never seen much discussion about them here in FTE, and I know that by itself tells part of the story.
I've just never seen much discussion about them here in FTE, and I know that by itself tells part of the story.
Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
Mine was still good at 400k when the truck was part of the fleet, but got replaced duue to a complete engine reseal.
IMO the seals will go out before the oil pump goes out.
Yet when I rebuild my engine at somewhere at 5-7k after my engine rebuild my LPOP wore out badly just from one side, installed a high volume lpop problem fixed. And the pump was the OEM pump the master engine rebuild that Clay sells, not some China knock off junk.
IMO the seals will go out before the oil pump goes out.
Yet when I rebuild my engine at somewhere at 5-7k after my engine rebuild my LPOP wore out badly just from one side, installed a high volume lpop problem fixed. And the pump was the OEM pump the master engine rebuild that Clay sells, not some China knock off junk.
Senior User
Joined: Nov 2018
Posts: 174
Likes: 0
From: Sault St.Marie
400k on motor with original pump. Front cover was excellent. 35psi at idle. 50 above idle. Delvac 1 & Shell T6 80% of its life.
Did a motor make over at 350k.
Bought a new OEM & Melling, both were so poorly machined along with nicks and burrs everywhere.
I have the resources to measure and inspect aerospace parts. Returned both.
Did a motor make over at 350k.
Bought a new OEM & Melling, both were so poorly machined along with nicks and burrs everywhere.
I have the resources to measure and inspect aerospace parts. Returned both.
Thread Starter
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Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
Trending Topics
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Replaced mine at 103k. She now has 2997xx on a Melling. It was the fad back in 2010 when i signed on..
My newer truck will get a melling soon. She gots 180k on what i think is still oem
My newer truck will get a melling soon. She gots 180k on what i think is still oem
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Tuned
Joined: Jan 2014
Posts: 441
Likes: 5
I replaced mine at 173,000 with a Melling only due to the original seal leaking badly leaving oil puddles in my garage. Replaced it and no more front cover leaks. But a word of caution. When one pulls on a little string a lot more of the sweater will start to unravel, and I’m the kind of guy who doesn’t know when to stop pulling. So a new Fluid Damper harmonic balancer went in $$$, all radiators went out to be pressure tested, and an upgraded 05-07 front end with new headlights went on $$$$.
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
I replaced mine at 173,000 with a Melling only due to the original seal leaking badly leaving oil puddles in my garage. Replaced it and no more front cover leaks. But a word of caution. When one pulls on a little string a lot more of the sweater will start to unravel, and I’m the kind of guy who doesn’t know when to stop pulling. So a new Fluid Damper harmonic balancer went in $$$, all radiators went out to be pressure tested, and an upgraded 05-07 front end with new headlights went on $$$$.
Hotshot
Joined: Mar 2012
Posts: 10,590
Likes: 382
From: Texas
Pete, I believe the failing signs are just failed oil pressure. I am not sure that they give any warning. That being said, I only replaced one LPOP in my last OBS because I was in there and the truck was in such poor shape from lack of maintenance that I just threw one in. The old one came out without a nick. Knowing what I know now, I would have left it alone. If it were me on your truck, I'd leave it alone. Hope this helps. Also, if you did have to replace later, removing and replacing isn't that big of a deal other than pulling the crankshaft pulley to get the LPOP cover off.
Tuned
Joined: Jan 2014
Posts: 441
Likes: 5
Biggest difference made the engine feel smoother.
https://www.riffraffdiesel.com/fluid...ance-damper-1/
https://www.riffraffdiesel.com/fluid...ance-damper-1/
Laughing Gas
Joined: Sep 2006
Posts: 1,097
Likes: 9
From: Minnesota
My 2000 has 326’xxx on it all original, plenty of cold starts up here in Mn, don’t know if that would have any effects on longevity.
I ran Rotella 10-30 for a good portion of its life now on Rotella T6 5-40.
I ran Rotella 10-30 for a good portion of its life now on Rotella T6 5-40.