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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.
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
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.
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
timing cover is leaking oil betwwen cover and block
Disconnect the negative battery cable.
Remove the drive belt(s), fan and fan shroud. If equipped, remove the accessory drive belt pulley.
Remove the vibration damper retaining bolt and washer. Remove the vibration damper using a suitable puller.
Remove the accessory drive brackets attached to the timing cover.
Remove the A/C compressor, if equipped, and alternator bracket from the cylinder head and move to one side.
Remove the oil pan-to-timing case cover bolts and the cover-to-cylinder block bolts.
Remove the timing case cover front seal and gasket from the engine.
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
Clean the timing case cover, oil pan and cylinder block gasket surfaces.
Remove the crankshaft seal oil seal from the cover by prying it out with a suitable tool.
Install a new seal in the timing cover using a suitable seal installation tool.
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.
Coat the front cover seal end tab recesses generously with sealer and position the seal on the timing cover.
Apply engine oil to the seal-oil pan contact surface, then position the cover on the cylinder block.
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).
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.
Apply a light film of oil to the vibration damper hub seal
contact surface. Install the vibration damper using a suitable
Do not hammer the damper into place as damage may result to the damper or engine.
Install and tighten the crankshaft vibration damper bolt to 80 ft. lbs. (108 Nm).
If equipped, install the crankshaft pulley and tighten the bolts to 20 ft. lbs. (27 Nm).
Install the accessory brackets.
Install the fan and fan shroud.
Install the drive belt(s) and adjust to the proper tension.
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
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.