4.0 oil pump question

handyman1355 · 10-16-2010, 06:33 PM

when my truck is cool the oil pump does not seem to get the oil pressure up as quick as it should. some rattle for just a split second until the pressure gets up. Do yall think that a new oil pump would help with the cool starting rattle?

Ronv · 10-16-2010, 09:46 PM

I think there is supposed to be a check valve to keep the oil in the passageway, possible a bit of dirt got in the way of the check-ball. I had the same problem but stepped up my oil changes for a couple of months and it finally went away.

Ron V

**AllanD** · 10-18-2010, 02:46 PM

More often than not a 4.0 with an oil pressure issue has a gummed up pickup.

AD

kimcrwbr1 · 10-18-2010, 05:49 PM

Run 1/2 quart of ATF in it for about 100 miles then change the oil and use a motorcraft filter. See if that helps what kind of filter do you have in it.

ragajungle · 10-18-2010, 06:21 PM

I have the same God Awful lower end bearing clatter when I start up after she sits for more than 10 hours...I tried almost 3 different oil filters to no avail. Would Seafoam in the crank case work?

(sorry to jack this thread)

but I have been fighting this issue too!

handyman1355 · 10-19-2010, 07:13 PM

Quote:

Originally Posted by ragajungle

I have the same God Awful lower end bearing clatter when I start up after she sits for more than 10 hours...I tried almost 3 different oil filters to no avail. Would Seafoam in the crank case work?

(sorry to jack this thread)

but I have been fighting this issue too!

thats quiet alright as long as we get an answer. by the way I put a mechanical gauge on mine and the oil pressure is about 50 psi at a cold start up but seems slow to get there should the needle jump right away to that pressure? if so maybe the pickup is clogged somewhat.

ragajungle · 10-19-2010, 07:43 PM

handy,
I replaced the oil sender in my B2 and before that the gauge barely touched (L) for Low. After it was okay and jumped straight to the middle range. I understand that this sender is a on/off switch and doesn't have the capacity to give actual range.

That Aside other people here and on other forums with the 4.0L have the same sporadic gauge issue and replacing the sender has almost always fixed it. I also noted that others with this motor Also have the clatter/knocking on cold start up with "good" pressure indicated on the gauge so maybe it incidental to a stopped up pick-up tube?

handyman1355 · 10-20-2010, 01:07 AM

Quote:

Originally Posted by ragajungle

handy,
I replaced the oil sender in my B2 and before that the gauge barely touched (L) for Low. After it was okay and jumped straight to the middle range. I understand that this sender is a on/off switch and doesn't have the capacity to give actual range.

That Aside other people here and on other forums with the 4.0L have the same sporadic gauge issue and replacing the sender has almost always fixed it. I also noted that others with this motor Also have the clatter/knocking on cold start up with "good" pressure indicated on the gauge so maybe it incidental to a stopped up pick-up tube?

I think i will pull the lower pan and try to get the pickup tube off for cleaning.

sholzy · 10-20-2010, 06:06 AM

Quote:

Originally Posted by handyman1355

I think i will pull the lower pan and try to get the pickup tube off for cleaning.

Do you plan on pulling the motor? That's the only way to get the pan off.

handyman1355 · 10-20-2010, 05:52 PM

Quote:

Originally Posted by sholzy

Do you plan on pulling the motor? That's the only way to get the pan off.

I said lower pan. and i have already pulled the pickup tube but it was clean. put it back together and just hope it holds together.

sholzy · 10-20-2010, 06:51 PM

On a 2001 4.0 you can remove the pan without pulling the motor? Everything I've read and heard you have to pull the motor to do that.

handyman1355 · 10-22-2010, 02:57 AM

Quote:

Originally Posted by sholzy

On a 2001 4.0 you can remove the pan without pulling the motor? Everything I've read and heard you have to pull the motor to do that.

mine has an 2 peice pan upper and lower i know the lower pan can be removed in the truck.

10-16-2010, 06:33 PM	#1
handyman1355 Junior Member Join Date: Jul 2010 Year: 2001 Make: ford Model: ranger Posts: 30 Rep Power: 6 iTrader: (0)	4.0 oil pump question when my truck is cool the oil pump does not seem to get the oil pressure up as quick as it should. some rattle for just a split second until the pressure gets up. Do yall think that a new oil pump would help with the cool starting rattle?
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10-16-2010, 09:46 PM	#2
Ronv Member Join Date: Jan 2008 Location: Nevada Year: 1994,2001 Make: Ford Rangers S Model: Ranger,ext-cab 4-dr Engine: 4.0 SOHC Class: 4 x 4 Used For: Daily Drive Posts: 238 Rep Power: 11 iTrader: (0)	I think there is supposed to be a check valve to keep the oil in the passageway, possible a bit of dirt got in the way of the check-ball. I had the same problem but stepped up my oil changes for a couple of months and it finally went away. Ron V
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10-18-2010, 02:46 PM	#3
AllanD RBV Technical Advisor Join Date: Jun 2001 Location: East-Central Pennsylvania Year: 1987... sorta Make: Ford Model: Ranger Supercab Engine: '93 4.0 Class: 4x4 Used For: Roadtrip Warrior Posts: 7,169 Rep Power: 47 iTrader: (18)	More often than not a 4.0 with an oil pressure issue has a gummed up pickup. AD __________________ Gun Control - A theory espoused by some monumentally stupid people; who claim to believe, against all logic and common sense, that a violent predator who ignores the laws prohibiting them from robbing, raping, kidnapping, torturing and killing their fellow human beings will obey a law telling them that they cannot own a gun.
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10-18-2010, 05:49 PM	#4
kimcrwbr1 Member Join Date: Dec 2009 Location: maplevalley WA Year: 1983 Make: ford Model: ranger Engine: 2.8l Class: 2WD street Used For: DD tow boat Posts: 4,649 Rep Power: 19 iTrader: (0)	Run 1/2 quart of ATF in it for about 100 miles then change the oil and use a motorcraft filter. See if that helps what kind of filter do you have in it. __________________ it takes a nickle to go first class when it stops hurting it will feel alot better
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10-18-2010, 06:21 PM	#5
ragajungle Member Join Date: Jun 2010 Location: Burlington, WI Year: 1989 Make: Ford Model: Bronco II Engine: 2.9L V6 Class: 4x4 Used For: Wrench, Mud, Rinse, Repeat Posts: 351 Rep Power: 6 iTrader: (0)	I have the same God Awful lower end bearing clatter when I start up after she sits for more than 10 hours...I tried almost 3 different oil filters to no avail. Would Seafoam in the crank case work? (sorry to jack this thread) but I have been fighting this issue too! __________________ 99 Ex Sport 4.0L OHV 4WD 102K 89 BII 2.9L 5 Spd 4x4 197K 97 Ex 5.0L AWD 250K 94 Ex Sport 4.0L OHV 287K-sold
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10-19-2010, 07:43 PM	#7
ragajungle Member Join Date: Jun 2010 Location: Burlington, WI Year: 1989 Make: Ford Model: Bronco II Engine: 2.9L V6 Class: 4x4 Used For: Wrench, Mud, Rinse, Repeat Posts: 351 Rep Power: 6 iTrader: (0)	handy, I replaced the oil sender in my B2 and before that the gauge barely touched (L) for Low. After it was okay and jumped straight to the middle range. I understand that this sender is a on/off switch and doesn't have the capacity to give actual range. That Aside other people here and on other forums with the 4.0L have the same sporadic gauge issue and replacing the sender has almost always fixed it. I also noted that others with this motor Also have the clatter/knocking on cold start up with "good" pressure indicated on the gauge so maybe it incidental to a stopped up pick-up tube? __________________ 99 Ex Sport 4.0L OHV 4WD 102K 89 BII 2.9L 5 Spd 4x4 197K 97 Ex 5.0L AWD 250K 94 Ex Sport 4.0L OHV 287K-sold
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10-20-2010, 06:51 PM	#11
sholzy Member Join Date: Mar 2009 Location: Texas Year: 1993 Make: Ford Model: Ranger XLT Engine: 4.0 Class: 2WD Used For: Daily Driver Posts: 175 Rep Power: 9 iTrader: (0)	On a 2001 4.0 you can remove the pan without pulling the motor? Everything I've read and heard you have to pull the motor to do that.
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