Melling LPOP= :) - Ford Powerstroke Diesel Forum
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Old 03-20-2012, 08:41 PM
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Melling LPOP= :)

I have been chasing a vibration under WOT for two years now. Having replaced a laundry list of parts I was down to either a weak hpop or possibly a failing flywheel. However, during this time I have always had a suspicion that the vibration was some kind of aeration of the oil as the vibration just didn't feel like anything out of balance etc. Last week I was reading a post detailing aeration issues with a worn stock lpop and that the Melling pump had taken care of the problem. Without doing any research of my own in regards to the aeration I decided to give the Melling a shot. I am VERY happy to report that my vibration is gone and the truck runs MUCH better. Before the pump I had a hard time getting to redline as it would kind of hang up around 2,900 rpms. Now it freely and quickly revs to redline and pulls hard through every gear. I am assuming the "hang up" was due to the reservoir losing pressure and/or volume and that it took a second or two for the stock pump to catch up. I have 175,000 mi on my rig and wish I had installed this pump 30,000 mi ago. For $80 I would have no problem replacing it every 100,000.
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Old 03-21-2012, 05:38 AM
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I replaced my stock LPOP with Melling too. Primarily because truck would not start (not enough LPOP pressure tofeed the HPOP), and also because of the front main seal leak. Melling came with new seal, and fixed the leak and the no start problems in one shot

Paid ~$80 as well
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Old 03-21-2012, 11:59 AM
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how easy was it to install? with 270k on my rig I want to replace mine sometime
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Old 03-21-2012, 12:06 PM
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Easy, I removed fan, belt, and crank pulley. Pump is held on by few bolts, remove/replace, put back together. 30 min
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Old 03-22-2012, 06:52 PM
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Easy, yes. 30 minutes easy...not in my opinion; but I don't have a shop or anything remotely close to work in. By the time I dealt with cleaning up the mess of antifreeze, oil and scattered tools it took me just under 2hrs.
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Old 03-23-2012, 12:04 PM
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175K is a little early. May want to have a oil analysis done to see if something more is going on. 200-250K seems to be pretty common for needing a replacement on these.
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Old 03-23-2012, 12:23 PM
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Quote:
Originally Posted by duck fan View Post
175K is a little early. May want to have a oil analysis done to see if something more is going on. 200-250K seems to be pretty common for needing a replacement on these.


Last oil analysis (168,000) was golden. I will take pics and post when I have a chance, the pump was definitely worn. Not horribly, but enough to cause aeration and loss of efficiency for sure.
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