Go Back   DodgeForum.com > Dodge Trucks > Dodge Ram > 2nd Gen Ram Tech
Sign in using an external account
Register Forgot Password?


2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Oil pressure problems, 99 Ram 1500

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 09-28-2006, 07:32 PM
spiral72 spiral72 is offline
Rookie
1999 Dodge Ram 1500
My Garage
 
Join Date: Sep 2006
Posts: 66
Default Oil pressure problems, 99 Ram 1500

First I apologize for the length of this post. I'll make it brief as possible.

I bought a 1999 Dodge Ram 1500, 5.2L 4WD with 99k miles and drove it for about 2 years without problems. I changed the oil regularly with Valvoline 10W30 oil.

I parked the truck for 1 year without starting it. After this time I checked the fluids, started the truck and let it reach operating temperature. All was normal. Later, after driving 10 minutes (6-7miles) the oil pressure dropped to zero. I shut the engine down immediately and checked the oil. I started the truck after several minutes noting normal oil pressure and drove the truck home.

I changed the oil and filter: Same problem.

I pulled and cleaned the pan, installed a new Melling high volume pump, verified the pump shaft, and cleaned the pickup so that it looked new, inside and out with oven cleaner: Same problem.

I installed a mechanical oil pressure gauge to verify the readings.

I pulled the pan and checked the pickup height. The pickup was tight, and the pump was tight with a gasket. I pulled the valve covers. The smooth black crust on the valve train and head concerned me. I cleaned the head thinking the oil was being held under the valve covers and running the pump dry. Same problem.

I pulled the pan to check if the pickup had ingested anything and applied teflon tape to the pickup threads as a precaution. I pulled the intake thinking the black sludge was keeping the oil thererain holes. No problems. With the intake removed I was able to drive the pump with a primer shaft. Oil flow seems to be what I would expect. Oil flow seems to be uniform from the head in the lifter valley and draining properly.

The pressure starts at 70psi(cold) and drops slowly to 60psi(warm) with the high volume pump (60psi & 45psi stock pump). If I drive the truck the pressure drops slowly to zero and stays there. At a 3000rpm+ engine speed, no load, the oil pressure drops rapidly to zero then stay there. I may be hearing the oil pump cavitate or chatter at zero pressure. I assume it is running out of oil but as near as I can tell there is always oil in the crankcase, however it’s difficult to determine with the engine running.

I’ve tried running 20W50 oil with no change. Crankshaft bearings don’t make sense in this case, however I’ll check the endplay tonight as I saw on another post. If crankshaft bearings were at fault, why would the pump cavitate/chatter? I’ve put an incredible amount of time into this problem already. I wanna’ drive my truck again!

Thanks,
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
Reply With Quote
  #2  
Old 09-28-2006, 08:16 PM
The Burning Rom The Burning Rom is offline
Record Breaker
Garage is empty, add now
 
Join Date: May 2005
Location: Wisconsin
Posts: 2,415
Send a message via AIM to The Burning Rom
Default RE: Oil pressure problems, 99 Ram 1500

I just thought of something, after posting in your other thread earlier. Have you checked the oil pressure relief valve? It could be bad. I can't remember if it's part of the pump on the V8s, or if it's in the front cover like it is on my V10.
__________________
TB Spacer Myth (Click Here)

COMING SOON! TBR billet fuel injector spacers! []
Reply With Quote
  #3  
Old 09-29-2006, 06:50 AM
dodgerules86's Avatar
dodgerules86 dodgerules86 is offline
Champion
Garage is empty, add now
 
Join Date: Dec 2003
Vehicle: 1996 Dakota 4x4, 3.9L, extended cab, automatic.
Location: Sycamore, Illinois (displaced to Arkansas)
Posts: 4,121
Default RE: Oil pressure problems, 99 Ram 1500


Quote:
ORIGINAL: The Burning Rom

I just thought of something, after posting in your other thread earlier. Have you checked the oil pressure relief valve? It could be bad. I can't remember if it's part of the pump on the V8s, or if it's in the front cover like it is on my V10.
Suprize, 'Rom is right again [8D].


[IMG]local://upfiles/948/A05FEAAC4E244F3A9083CB9424C48F0C.jpg[/IMG]
__________________
If parts ain't flyin', you ain't tryin'.
1996 Dodge Dakota, 4x4, extended cab, 3.9L, automatic. - my baby
2012 VW Jetta Premium with Nav, 2.0L TDI diesel, 6-speed manual - the daily
Traded: 2009 Toyota Corolla S, 1.8L, 5-speed manual
Reply With Quote
  #4  
Old 09-29-2006, 12:19 PM
spiral72 spiral72 is offline
Rookie
1999 Dodge Ram 1500
My Garage
 
Join Date: Sep 2006
Posts: 66
Default RE: Oil pressure problems, 99 Ram 1500

Yea, I thought of that, but I changed the pressure relief valve when I changed the pump.......right?

I didn't get to check the endplay last night. I got home very late.

On a positive note, I'm getting pretty good at pulling the pan off on this truck. It only takes about 15-20 minutes now.
Reply With Quote
  #5  
Old 09-29-2006, 12:36 PM
Horseapples's Avatar
Horseapples Horseapples is offline
Record Breaker
Garage is empty, add now
 
Join Date: Dec 2005
Vehicle: 04' HEMI 2 door SWB
Location: Shreveport Louisiana
Posts: 2,005
Default RE: Oil pressure problems, 99 Ram 1500

I had a somewhat similar problem in of all things,a 225ci slant 6.I dont think this is your problem but I will throw it out there anyway.I had oil pressure on start up but it dropped to zero within a couple of minutes,turned out a cam bearing had loosened and spun blocking about 90% of the oiling hole.My top end was also bone dry as you described.The closed off oil hole was causing high pressure and the relief valve was letting the oil by-pass back to the pan.The v8 and slant6 are quite different engines though,so I dont know if this could be your problem or not.
__________________
Passin gas and haulin' ***!
Member: Over the Top Group
Reply With Quote
  #6  
Old 09-29-2006, 12:52 PM
spiral72 spiral72 is offline
Rookie
1999 Dodge Ram 1500
My Garage
 
Join Date: Sep 2006
Posts: 66
Default RE: Oil pressure problems, 99 Ram 1500

Does any one know what pressure the relief valve is supposed to trip at?
Or if it resets itself if pressure returns to normal? I expect it would, since it's only a spring/piston/valve assembly.

I'm getting nice oil flow throughout the engine. The valve train was nicely oiled even before I cleaned the sludge. I just thought that by some chance the sludge slowed the oil from draining back properly and causing a "low oil" situtation in the crankcase. It was a nice thought anyways.
Reply With Quote
Old 09-29-2006, 12:52 PM
 
 
 
Reply




Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join DodgeForum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -4. The time now is 07:45 PM.

Internet Brands, Inc.


Contact Details & Emails