Question about 2003 Chevrolet Silverado 1500

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Major oil leak

I have heavy oil leak underpressure from timing belt cover and oil pan gaskets...

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  • Mike Butler
    Mike Butler May 11, 2010

    Too much crankcase pressure? Have you checked PCV valve & system for kinked hose etc?

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Check front crank seal ive replaced lots of those and you may have to sleeve the crank pully

Posted on May 31, 2009

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1 Answer

CAR HAS HUGE OIL LEAK


Valve cover gaskets, oil pan gaskets and timing cover gaskets are the three major oil leak points. Power wash the engine carefully ( or have a professional do it ) so you can eventually see where the leak or leaks are originating from. If you wash the engine keep away from alternator and wiring connectors.

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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

Apr 21, 2011 | 1994 Dodge Caravan

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1992 Ford Crown Victoria Oil Pan is leaking. Is this a major problem to replace? Fred


It is recommended that you lift out the engine before attempting to replace the oil pan. Once the engine is lifted you can remove the bolts, remove the pan, clean all the old gasket material.
Installation: Remove the rear main bearing cap oil seal Remove the timing cover oil seal Clean all the mating surfaces and seal grooves Install new oil pan front cover seals Install a new rear main bearing cap oil seal Install new oil pan side gaskets on the block Make sure the tabs of the front and rear seal fit properly as these are critical spots Attach the oil pan to the engine block and install the retaining bolts

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Oil Is Leaking Out Under The Harminc Balancer On my 92 Jeep Wrangler,4.0 6cyl. I Replaced The Main Seal & Put A New Balancer On & It Still Leaks From The Bottom Of The Balancer


  1. timing cover is leaking oil betwwen cover and block
  2. Disconnect the negative battery cable.
  3. Remove the drive belt(s), fan and fan shroud. If equipped, remove the accessory drive belt pulley.
  4. Remove the vibration damper retaining bolt and washer. Remove the vibration damper using a suitable puller.
  5. Remove the accessory drive brackets attached to the timing cover.
  6. Remove the A/C compressor, if equipped, and alternator bracket from the cylinder head and move to one side.
  7. Remove the oil pan-to-timing case cover bolts and the cover-to-cylinder block bolts.
  8. Remove the timing case cover front seal and gasket from the engine.
  9. Cut off the oil pan side gasket end tabs and oil pan front seal tabs flush with the front face of the cylinder block. Remove the gasket tabs.
  10. Clean the timing case cover, oil pan and cylinder block gasket surfaces.
  11. Remove the crankshaft seal oil seal from the cover by prying it out with a suitable tool.

To install:

  1. Install a new seal in the timing cover using a suitable seal installation tool.
  2. Apply sealer to both sides of the replacement cover gasket and position the gasket on the cylinder block. Cut the end tabs off the replacement oil pan gasket corresponding to those cut off the original gasket. Attach the end tabs to the oil pan with sealer.
  3. Coat the front cover seal end tab recesses generously with sealer and position the seal on the timing cover.
  4. Apply engine oil to the seal-oil pan contact surface, then position the cover on the cylinder block.
  5. Insert timing case cover alignment tool J22248 or equivalent, in the crankshaft opening. Install the cover-to-cylinder block bolts and tighten them to 62 inch lbs. (7 Nm). Install and tighten the oil pan-to-cover bolts to 11 ft. lbs. (13 Nm).
  6. Remove the cover alignment tool and position a replacement oil seal on the tool with the seal lip facing outward. Apply a light coat of sealer to the seal and a light coat of oil to the crankshaft. Install the seal on the timing cover.
  7. Apply a light film of oil to the vibration damper hub seal contact surface. Install the vibration damper using a suitable installation tool.

Do not hammer the damper into place as damage may result to the damper or engine.

  1. Install and tighten the crankshaft vibration damper bolt to 80 ft. lbs. (108 Nm).
  2. If equipped, install the crankshaft pulley and tighten the bolts to 20 ft. lbs. (27 Nm).
  3. Install the accessory brackets.
  4. Install the fan and fan shroud.
  5. Install the drive belt(s) and adjust to the proper tension.
  6. Connect the negative battery cable.
  7. Start the engine and check for leaks
  8. .

Jan 18, 2011 | 1992 Jeep Wrangler

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1989 tercel major oil leak passanger side. how do i change the oil pump gasket? do i need to change timing belt too? N where is the unit located? is it under the cover between the valve cover and oil pan?


The oil pump is located under the black timing cover , however your leak is likely the lower main seal under that cover as well , your oil pump will be on the upper right side , you should replace them both and the timing belt while your there considering the cost of the parts , it is good insurance you wont lose your belt while you still own your car and have to go back in again , it is not hard to do just be patient , also when you loosen off your timing belt tensioner '' to remove the belt ''dont forget to re tension it after you replace it

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I have a major oil leak and have replaced the oil pan gasket and it still leaks.


Check your front crankshaft seal and timing cover gasket, also check your oil sending unit, sit next to oil filter.

Dec 17, 2009 | 2004 Pontiac Grand Prix

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Could be a rear main seal.

Apr 02, 2009 | 1998 Mazda Protege

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Oil on bottom half of motor


it may be a worn front engine crankshaft or camshaft seal.

Nov 18, 2008 | 1991 Nissan Pickup

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I have an 86 honda accord lxi with an oil leak. we have changed the valve cover gasket, oil pan gasket, oil pump gaskets, and the cam seal, but it still leaks from the timing belt cover and sprays onto the...


There are two slots in the valve cover right by the cam shaft sprocket that have to be honda bonded or black rtv. look closely at the valve cover right above the gasket underneath the timing belt cover. Hope that helps.

Jul 27, 2008 | 1986 Honda Prelude

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