Question about Dodge Ram 1500

1 Answer

I recently replaced head gaskets on a 4.7 engine. After completion we noticed that the oil pressure drops off to zero after running for approximately 15 minutes at normal engine temperature. The pressure stays up while engine is cold. We changed the oil to a different weight, since the same problem. We pulled the pan, no slug build up. Changed the oil sender, no changes. Removed valve covers and rechecked timing marks on cams...no problems. Any suggestions or advice would be helpful. Thank you. Bill Ernie's Automotive Service

Posted by on

  • Anonymous Mar 16, 2009

    i have a ba mazda astina and we had it in for a new head gasket and replacing the timing belt and it came out with oil pressure problems. it drove about 50km and the oil light started coming on and then continued coming on everytime i took my foot off the accelerator. once we turned the car off, the next time we turned it on there was a really loud knocking noise like there was no oil in the engine. what could have caused this?

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 17 Answers

Bill,
Generally when this condition occurs, there is a leak in the oiling system. The most likely cause is a bearing the has excessive clearence. Look up into the block with the pan off and see if one of the cam bearings are spun. This will cause a loss of oil pressure with no knock. This can occur if the engine overheats which I will assume is why you replaced the head gaskets.

Posted on Aug 20, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Small amount of milk in oil


To check whether the coolant is entering into the engine oil or not, do the following.
- Park the car on a level floor.
- Check engine oil level on the dip stick and mark it with nail polish. Let it dry. Confirm the oil level. Put the dip stick back.
- Apply about 10 psi external pressure to the coolant system, while keeping caps in place.
NOTE: It is advised to use the coolant system tester. In case the tester is not available, ask any technician to do it for you. Or you can use a bicycle pump with gauge installed on it to pressure the system up to 10 psi. The system should held the pressure up to 30 Seconds.
- If the pressure is maintained for 30 Seconds every thing is good at this time. Ensure that the air is not leaking through your external pump system with which you are testing the system.
If the pressure drops, there will be a leakage some where. Either external or internal. External leakage can easily be observed while carefully examining the hose pipes, clips and joints on the engine.
Internal leakage can be determined by checking the engine oil level again.
- Take out the dip stick and inspect the oil level. If the engine oil level increases it confirm the internal leakage.
- Internal coolant leakage could be due to:-
1. Cylinder head bolts loose or under torqued. (Re-Torque the bolts).
2. Burnt cylinder head gasket. (Always use original spares).
3. Cylinder and head surfaces warped. (Surface grind the cylinder head on surface grinding machine and replace the gasket).
4. Any corroded lid in the cylinder block or cylinder head assembly.
5. Oil cooler, if any.
If the test report of above mentioned procedure is found to be OK, start the engine, pull up dip stick a little, open breather tube from the tappet cover, keep it open and keep the engine start for as long as the water vapors coming out of these points disappear and the engine oil will become clear to its original color.
At times it happens that immediately after replacing the cylinder head gasket some coolant may flow into the engine unavoidably and keep contaminating the engine oil for quite some time.
Hope that works.
Thank you for visiting Fixya.

Mar 03, 2014 | Chevrolet Cobalt Cars & Trucks

1 Answer

What causes yellow gunk in the oil cap on my 2004 chevy trailblazer


Could be a leaking head gasket or intake gasket.
The gunk is water or coolant. Water if the engine never warms up, coolant if there is a leak.

Mar 06, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

91 plymouth sundance died, oil on ground, check engine on


If you feel like the engine is still ok, I would look at the oil pressure and check engine light issues.
On engines with fuel injection, the fuel pump is powered by the pump relay until the engine starts. Then the engine has to have oil pressure to keep the fuel pump powered.
Its a safety feature so if you are in a wreck the fuel pump does not keep running if the engine is off.
I would want to know why the oil pressure light is staying on and what the trouble codes are in the computer.

Jan 29, 2013 | Cars & Trucks

1 Answer

1991 jetta 1.8 manual. Oil pressure gauge works but as the car heats up after about 5 minutes the gauge drops to zero (no oil pressure), oil is pumping up to the cylinder head, drove the car for about...


you may have a faulty oil pressure sensor which needs replacing or a loose connection, check for any loose wires......hope this helps.....cheers.

Jun 20, 2011 | 1991 Volkswagen Jetta

3 Answers

1999 chevy suburban 2wd 1500 v8 driving


I suspect you have had an oil pump failure. To get at the rotory gear oil pump you will have to drop the oil pan. After you take the pan off, ( having drained the oil the oil pump is what the oil pick up line leads into. That pick up assy. is a round shaped disc with a screen inside it. Clean the screen first then the oil pump. Install new oil pan gasket on reassembly. Hope that helps you. Please let me know.

Hopefully the engine was not damaged when the pump broke. If it was you may need a complete engine rebuild, MAYBE.

Jan 26, 2010 | 2003 Chevrolet Suburban 1500

2 Answers

Head gasket


Typical symptoms of a blown headgasket may include: -bubbles of air coming up into your radiator (remove cap before starting) -leaking radiator -milkshake colored oil -overheating -rough running -coolant or oil running from head -spark plug(s) that have a green tint (if green coolant). -white colored or sweet smelling exhaust, white smoke of your tail pipe, or loosing coolant through your overflow

Dec 22, 2009 | 1989 Chevrolet S-10 Blazer

1 Answer

28 Solutions for ''HOw can I tell if I have a cracked head blown head gasket or cracked blown like how can I see it''


Often (but not always), a blown head gasket will also cause deposit of water on a piece of cardboard held an inch from the tailpipe output while the engine is running (when this is happening, it is likely that the catalytic converter has been ruined and the muffler will corrode in short order as well).

Sometimes drops of water will be seen dropping from the end of the tailpipe. Another clue: turn on the heater; often when the head gasket is blown an odor of antifreeze and synthetic rubber will emanate from the heater vents.
Many of the symptoms of blown head gasket can be caused by some other problem in the cooling system, without the head gasket being damaged. Conversely, other problems with the cooling system can cause a blown head gasket and/or warped head.

When checking for a blown head gasket, one of the most common tell-tale signs is a milky-gray ring around your oil cap. When coolant enters the engine oil through a crack in the head or through a blown gasket, it evaporates and leaves a milky ring around the oil cap. Another easy way to tell is to check your oil dipstick. Change your oil and pull out the dipstick. Make sure that you take note of how far up the dipstick the oil is. Top off your cooling system and fill your cooling reservoir to the top. Screw radiator cap back on and start engine. Run engine for about 20-30 mins. or until it reaches normal operating temperature. Allow engine to cool (engine must cool completely to get accurate oil reading!!). Check oil dipstick again. If the oil has a watery appearance and has risen noticeably up the dipstick, the you probably have a blown head gasket or a warped head. Also look for a dripping, sweet-smelling liquid coming out of your tailpipe. Any of the above symptoms could be the result of a blown head gasket. The easiest way to tell is with a compression meter. This replaces the spark plug and lets you know what compression each cylinder is running at. If your compression is abnormally low, then you have a blown head gasket or a warped head. (note: consult repair manual for appropriate compression of each cylinder.)

Dec 12, 2009 | 2005 Dodge Grand Caravan

3 Answers

Eating up oil but no visible leak on the driveway or underneath


Oops! Sounds like your engine block is cracked,or your engine heads are warped, or you need new head gaskets. The cheapest problem is the last one. However it still is not cheap. Most head gasket sets cost at least $100 or more. To see if you need head gaskets, after running the car for about 15 minutes, pull out the oil dipstick and see if you see oil or water bubbles on the stick. If you need head gaskets check ebay for your model, that's likely going to be your cheapest source. Also possibly the engine blocked is cracked internally. That explains the loss of oil AND coolant out the pipe. But this also comes with overheating, so if your car is not overheating then this may not be the problem. First advice: BE REAL CAREFUL! CONSTANTLY STOP TO CHECK AND ADD OIL AND COOLANT until you fix the problem. Another advice, take your car to a reputable repair shop and have the engine pressure tested for leaks to find the source. WARNING: Do not use engine block leak sealers, they mess up a lot of stuff on your engine, especially the radiator heater core.

Jun 11, 2009 | 2000 Ford Focus

1 Answer

White fumes in the engine oil filler cap


Sounds like you have blown the head gasket when it got overheated.. The white stuff in the oil cap is emusified oil, a bit like mayonnaise.
You will almost certainly need to replace head gasket and service the cylinder head.

Jun 08, 2009 | 1988 Toyota Corolla 4 Door

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

250 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dodge Experts

yadayada
yadayada

Level 3 Expert

60960 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Dodge Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...