High volume oil pump?
12-10-2018, 01:25 PM
#31
Newbie
Rebuilt engine still has the same clicty clack
OK, so I've replaced the cracked cylinder head on my 2000 XJ, but the damage was already done, and I have the usual low oil pressure. I know replacing or rebuilding the engine would have been "the right thing to do", but that wasn't financially viable at this time, and it seems lots of people have driven for years with similarly low pressure. Some have put in high volume oil pumps to get some pressure back, and yes, I know it's a band aid, but pushing more oil through means more oil will get to the top of the engine even while much is lost through the worn bearings lower down.
Anyway, the Melling High Volume Pump seems to be one of the more common ones and available locally. I hear some talk of it not fitting in the oil pan or interfering with the crankshaft while others report no problems, can anybody confirm that either way? Even the website linked above says "exact fit" for my vehicle, but also says "CHECK FOR PAN AND CRANK CLEARANCE". Maybe it fits some years and others have issues?
Or there's this one, which purports to be a Mopar product.
I figure while I have the pan off I can check the main and big end bearings and replace them if necessary, too.
Anyway, the Melling High Volume Pump seems to be one of the more common ones and available locally. I hear some talk of it not fitting in the oil pan or interfering with the crankshaft while others report no problems, can anybody confirm that either way? Even the website linked above says "exact fit" for my vehicle, but also says "CHECK FOR PAN AND CRANK CLEARANCE". Maybe it fits some years and others have issues?
Or there's this one, which purports to be a Mopar product.
I figure while I have the pan off I can check the main and big end bearings and replace them if necessary, too.
12-10-2018, 01:33 PM
#32
Newbie
Rebuilt engine still has the same clicty clack.
New rebuild great pressure ,but at 6800 miles the lifters and cam were shot.Put it back together a second time, checked oil flow, which was at 40 cold and 35ish warmed up, but now the lifters are making noise again.
NEED TO KNOW WHAT IS GOING ON
.
[.QUOTE=BiplaneGuy;3216972]OK, so I've replaced the cracked cylinder head on my 2000 XJ, but the damage was already done, and I have the usual low oil pressure. I know replacing or rebuilding the engine would have been "the right thing to do", but that wasn't financially viable at this time, and it seems lots of people have driven for years with similarly low pressure. Some have put in high volume oil pumps to get some pressure back, and yes, I know it's a band aid, but pushing more oil through means more oil will get to the top of the engine even while much is lost through the worn bearings lower down.
Anyway, the Melling High Volume Pump seems to be one of the more common ones and available locally. I hear some talk of it not fitting in the oil pan or interfering with the crankshaft while others report no problems, can anybody confirm that either way? Even the website linked above says "exact fit" for my vehicle, but also says "CHECK FOR PAN AND CRANK CLEARANCE". Maybe it fits some years and others have issues?
Or there's this one, which purports to be a Mopar product.
I figure while I have the pan off I can check the main and big end bearings and replace them if necessary, too.[/QUOTE]
NEED TO KNOW WHAT IS GOING ON
.
[.QUOTE=BiplaneGuy;3216972]OK, so I've replaced the cracked cylinder head on my 2000 XJ, but the damage was already done, and I have the usual low oil pressure. I know replacing or rebuilding the engine would have been "the right thing to do", but that wasn't financially viable at this time, and it seems lots of people have driven for years with similarly low pressure. Some have put in high volume oil pumps to get some pressure back, and yes, I know it's a band aid, but pushing more oil through means more oil will get to the top of the engine even while much is lost through the worn bearings lower down.
Anyway, the Melling High Volume Pump seems to be one of the more common ones and available locally. I hear some talk of it not fitting in the oil pan or interfering with the crankshaft while others report no problems, can anybody confirm that either way? Even the website linked above says "exact fit" for my vehicle, but also says "CHECK FOR PAN AND CRANK CLEARANCE". Maybe it fits some years and others have issues?
Or there's this one, which purports to be a Mopar product.
I figure while I have the pan off I can check the main and big end bearings and replace them if necessary, too.[/QUOTE]
12-10-2018, 04:37 PM
#33
Junior Member
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Join Date: Jan 2016
Location: New England
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Year: 2000
Model: Cherokee
Engine: 4.0
Jeksdad, you should probably start a new thread instead of piggybacking on an old (2½ years old) thread, you'll probably get more responses.
But I should probably update anyway... After replacing my oil pump with a high volume one, oil pressure increased by about 50% across the entire rpm range, and 2½ years and quite a few miles later, it's still running strong and I've had no further problems with it. So definitely worthwhile.
But I should probably update anyway... After replacing my oil pump with a high volume one, oil pressure increased by about 50% across the entire rpm range, and 2½ years and quite a few miles later, it's still running strong and I've had no further problems with it. So definitely worthwhile.
12-10-2018, 05:24 PM
#34
Newbie
Jeksdad, you should probably start a new thread instead of piggybacking on an old (2½ years old) thread, you'll probably get more responses.
But I should probably update anyway... After replacing my oil pump with a high volume one, oil pressure increased by about 50% across the entire rpm range, and 2½ years and quite a few miles later, it's still running strong and I've had no further problems with it. So definitely worthwhile.
But I should probably update anyway... After replacing my oil pump with a high volume one, oil pressure increased by about 50% across the entire rpm range, and 2½ years and quite a few miles later, it's still running strong and I've had no further problems with it. So definitely worthwhile.
12-10-2018, 06:45 PM
#35
Senior Member
I put one in my 01 with no fit problems and runs good . I have built engines all my life collage for auto machine run a machine shop for 7+ years and built race engines in my home shop for many many years and Melling High vol. pumps were always used on a wet sump engine that I built! Yes there are people out there that will tell you different but for me its will always be a Melling high vol.
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