Question about 2004 Mazda 6

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Rear engine oil leak

I see that my car has oil deposit at the rear right end of the engine. I am new to engines so cant really describe the location but its on the rear RHS of the engine, Theres some kind of alluminium cavity which has the oil deposit on it. It must be at least 3 cm. Could anyone advise what could be the problem. Do I have a seal problem ?

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Its probably the rear crankshaft seal leaking. Need to get the engine dismantled and repaired

Posted on Aug 20, 2008

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2002 grand am does not leak after driving, but I wake up in the morning to a huge puddle of oil.


SOUND LIKE FRONT CRANKSHAFT TIMING COVER SEAL OR REAR MAIN OIL SEAL LEAKING START ENGINE LET IT IDLE SEE IF YOU SEE OIL DRIPPING UNDERNEATH CAR LOOK FOR OIL LEAK AT TIMING COVER OR AT REAR OF ENGINE WHERE REAR MAIN SEAL LOCATED. CHECK ON TOP OF ENGINE INTAKE MANIFOLD AREA WHERE OIL PUMP DRIVE GEAR IS.O - RING AT THE OIL PUMP DRIVE GEAR WILL CAUSE LARGE OIL LEAK.OIL PUMP DRIVE GEAR IS LOCATED WHERE THE DISTRIBUTOR USE TO BE LOCATED.KEEP EYE ON OIL LEVEL IN CRANK CASE.KEEP PLENTY ENGINE OIL ON HAND UNTIL YOU FIX.I WOULD FIND LOCATE PROBLEM QUICK AS POSSIBLE BECAUSE OIL LEVEL GET TOO LOW ENGINE WILL SEIZE UP LACK OF OIL..

Jul 04, 2011 | 2001 Pontiac Grand Am SE

2 Answers

Leaking oil on right side of motor.


The crankshaft oils seals are known to leak after approx 100,000 miles. The Harmonic Balancer (fan belt pulley) end of the engine will have lots of oil and road grit around the oil pan, air conditioning compressor, power steering pump and other area in the engine bay due to wind spread. This seal can be replace without removing the engine. Remove the harmonic balancer bolt and use a pulley puller. If the seal mating surface is grooved replace the balancer too or the new seal will fail soon.

The transmission "bell housing" will weep oil and or trans fluid if the rear crankshaft seal or the transmission seal develops a leak. This seal is much larger than the front seal so it lasts longer and need replacing less often. The transmission will need to be removed from the car to reach these seals.

The oil pan is sealed with silicone engine sealant and will dry out and leak also. Sometimes the leak looks like it is the front or rear seal (pulley or transmission end of engine) but it may be the oil pan leaking and dripping into the pressure plate inspection plate or the pulley. The oil pan can be removed and resealed without removing the engine or transmission but it is a little tricky. Dropping the engine's under brace and exhaust pipe is recommended. Additional engine/transmission support is needed to do that.

While you are under the car look near the oil filter. Above and forward (toward the fan belt is forward) and see if there is oil dripping from the oil pressure sending unit wire. It will leak into the electrical connector. Squeeze it and see if oil seeps out. If so replace the sending unit. It looks kind of like a spark plug screwed into the block.

Near the oil filter you will see the power steering pump mounted to the side of the pulley end of the engine and it is over the right CV drive axle and has several hoses connected. One larger hose is a none pressure hose that gravity feeds the pump from the fluid reservoir mounted above it on the passenger side wheel well in the engine bay. This hose eventually leaks and drips power steering fluid everywhere! It is a molded hose from the dealer parts dept. and relatively easy to replace. Messy but do-able.



Now the top side of the engine. The valve cover has a rubber gasket that shrinks over time in that hot engine bay. Take a Phillips head screw driver is see how loose the screws holding it are. Really loose hu? You can tighten them but you should replace it because it shrunk and that makes the screws loose.

You will need some silicone engine sealant each side of the distributor bridge at the driver's side of the cover. Get a manual to make sure you tighten those screws in the correct order.



Distributor "O"ring seal can leak. Two 12MM bolts to remove it and put a new "O"ring on and you are set. Mark the Distributor's position to the bridge bracket BEFORE you loosen those screws. Line it back up to the marks so you don't mess up the timing and reset the timing after is even better.

Jun 26, 2011 | 1996 Nissan Sentra

2 Answers

I have a 1989 f150 that is leaking oil from some where on top of engine. I just replaced the rear main seal and valve gaskets look good. The oil is dripping down the bell housing.


Start at the top of the engine and work your way down, intake manifold end gaskets possibly, try some leak detector spray. Looks like a powder when it dries....spray it on the area of the engine you suspect the oil is leaking from, let it dry......go drive it for a bit and recheck.....use an inspection mirror, the oil trace will show up as a dark streak when it leaks. Try NAPA. Good luck.

Mar 12, 2011 | 1989 Ford F 150

1 Answer

Oil leaking from back of motor . changed oil pan gasket-valve cover gasket-rear main seal. cant find where its comeing from


The oil pressure switch is located on top at the
transmission end of the engine.
If the switch is leaking, it could appear to be coming
from the places you mentioned. Hope this helps.
Good luck

Jan 22, 2010 | Toyota RAV4 Cars & Trucks

1 Answer

My 2001 chevy cavalier has a oil leak and I can't


You can buy a florescent dye to add to the oil and a light to make the dye really shine.
Clean the engine with "brake clean" from a spray can at the oil leak areas ....then run the engine.
Check for the start location of the leak.
Start with a short run time ....... then longer run time if necessary until the leak(s) show.
With or with out the dye ......this brake cleaning method should help locate the leak(s).

Oil leak locations could be...in order of the most common on your car are........valve cover gasket,oil filter,oil pressure sending unit,drain plug,oil pan gasket,crank pickup sensor,rear seal.

Oct 14, 2009 | Chevrolet Cavalier Cars & Trucks

1 Answer

Oil leak 94 dodge caravan 3.0L


Could it be the rear main seal? Some times oil can be "blown" around in bell housing from fly wheel. If you can pry the inspection plate with a little regular screw driver and oil starts to come out its a good chance its the rear main

Aug 06, 2009 | 1994 Dodge Caravan

1 Answer

My 2002 altima has an oil leak... but why is the oil in the engine always black even after i fill it or i change it?


I cant help you solve your leak problem without more information... but... your oil will be black from a mixture of carbon deposits and acid. Some of this is from the blow-by when the fuel is ignited in the combustion chamber, some is from the oil breaking down when heated by the engines high tempurature. The more frequently you change the oil along with using very high quality oil (like a fully synthetic oil), the less carbon will be built up. Some people rarely change the engine oil, after a while (a few yrs of infrequent oil changes) the carbon will be substantial enough to blacken very recently changed oil.

The moral of the story, oil is cheap, engines aren't. Change your oil frequently it really does matter. IMHO

May 01, 2009 | 2002 Nissan Altima

1 Answer

I CANT LOCATE CRANK POSITION SENSOR


7X Crankshaft Position (CKP) Sensor
Lower rear of engine
4
25
--
24X Crankshaft Position (CKP) Sensor
Right hand side of engine, at end of crankshaft, behind harmonic balancer
7X Crankshaft Position (CKP) Sensor
Lower rear of engine
4
25
--
24X Crankshaft Position (CKP) Sensor
Right hand side of engine, at end of crankshaft, behind harmonic balancer
Right hand side of engine, at end of crankshaft, behind harmonic balancer

Apr 12, 2009 | 1995 Chevrolet Monte Carlo

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