Question about 1999 Chevrolet Silverado 1500

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Oil leak rear of engine - 1999 Chevrolet Silverado 1500

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Posted on May 01, 2010

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05 malibu leaking oil from rear of engine


This may be from excessive pressure in the sump from blow-by from the compression process . It is from a blocked PCV valve that is not equalising that pressure. I have also known oil leaks to happen because the rear main bearing cap is leaking oil past the join around the bolts (loose) or no sealing compound used in assembling the rear main bearing.. I would look at the PCV valve as it is the cheapest test first.. Check that the oil is not coming from the front gear box seal or torque converter seal.

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Dear Sir,
Here is the oil leaking Problem Identifying Technique

Engine oil leaks from the valve cover gasket are common.

  • The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.
  • External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.
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  • I think it helps to analyse u r Problem

    Nov 02, 2012 | Toyota Cars & Trucks

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    Oil leak from bottom rear of engine does'nt appear to be pan or rear main maybe higher on engine,maybe oil sending uniy?


    clean up the engine with a good engine cleaner follow the instruction of the can use a hight preesure wather machine ,(cover with plastic bags the electrics parts alternator,ignition components ,etc....)after you clean up the engine run afew miles and you will be found the exact place of the oil leak.

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    Engine oil leeks between gearbox & engine


    Sounds like a rear main seal, the crankshaft's rear main engine seal. On newer vehicles, it is a one-piece design, and easy to install. The problem is the engine and transaxle have to be separated to get to it. You would either have to pull the engine and transaxle out of the car together for separation, or drop the transaxle and replace the seal with the engine still in the car.
    Of course you'd want to know for sure it was a rear main before you started. Check the oil pan carefully around the rear of engine for leaking there. If you clean the area around the leak, you may spot where the new oil comes out. Parts stores have kits for sale to detect leaks. You put a dye in the oil, and use the flourescent light to spot the oil leaking with the flourescent-sensitive dye in it. I hope you find it, good luck.

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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..

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    Hi i have a 1994 dodge caravan it is leaking oil can this be fix im worry that we would have to save money for a van for my kids thanks


    The Chrysler minivan products all had leaking problems. I have had 5 or 6 different Dodge or Plymouth minivans from 88 to 99. How bad is it. The most common thing is Valve cover leaks. Front and rear seals in the engine leak as well as the oil pan gasket. If its leaking a little bit at a time open the hood and look at the front and rear of the engine. Do you see grease and oil that has gone down the sides of the engine? Do you see a lot of grease on the engine with some clean streaks going through it. You may be able to see where its leaking from. If you know someone that knows what their doing have them change the leaky gasket/s. If not you can probably have it repaired for less than buying another van unless other things are seriously wrong with the van.
    Hope this helps... Dale

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    Rear engine oil leak....


    Oil leak can be attributed to several factors.
    1. Gasket failure.
    2. Uncontrolled Crank case pressure Failure.

    RECOMENDATION:
    Tighten both the valve cover and oil pan bolts.
    Replace the Positive Crankcase Ventilation Valve and vacuum line.,

    INFO: PCV
    This is a valve causes a negative vacuum on the engine while its running, As to say if it had a leak in a valve cover it should not be leaking while its running, only when the engine it turned off.

    Hope this tip guides you in the correct direction to solve this problem.

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    Overfilled is not good but it would have to be very high to cause leak,There are numerous places in rear of engine that could be leaking.could be leaking from rear of intake,the oilpump drive o ring,but most likly leaking from rear main seal that seals at the rear of the crankshaft and the transmission will need to come out to access this seal. you will need to have the oil leak diagnosed to locate the exact spot.

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