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Most vehicles with timing chains have a cover over the chain that it attached to the oil pan. There are gaskets that have to be replaced between the two and removal of the pan is recommended to do this properly. Trying to avoid it can result in a number of issues, from gasket material falling into the sump to oil leaks from not having the lower part of the cover sealed properly.
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.
It's a chain. procedure listed below. Thanks for using fixya.
Disconnect the negative battery cable.
Remove the power steering fluid reservoir from the radiator shroud, then remove the upper fan shroud.
Carefully release the belt tension, then remove the serpentine drive belt.
Remove the alternator and brackets from the engine, then position them aside.
Remove the crankshaft pulley and hub. For details, please refer to the procedure located earlier in this section.
As necessary, disconnect the lower radiator hose clamp at the water pump, then loosen and/or remove the oil pan.
There may be bolts attaching the front of the oil pan to the timing cover. If so, make sure they are removed before attempting to remove the cover.
Unfasten the crankcase (timing) front cover bolts, then disengage cover from the engine. Make sure all bolts are removed and be careful not to force and damage the cover.
Carefully remove the old crankshaft seal from the cover using a suitable prytool. Be very careful not to distort the front cover or to score the end of the crankshaft.
Carefully remove all traces of gasket or sealant from the mating surfaces.
Lubricate the lips of a new seal with clean engine oil, then use a seal centering tool (such as J-35468 or equivalent) to install the seal to the front cover. Leave the tool in position in the seal until the cover is installed.
Apply a 3 / 8 in. (10mm) wide by 5 / 16 (5mm) thick bead of RTV sealer to the oil pan at the front crankcase cover sealing surface. Then apply a 1 / 4 in. (6mm) by 1 / 8 in. (3mm) thick bead of RTV to the crankcase front cover at the block sealing surface.
Install the crankcase front cover to the engine using the seal tool to assure it is properly centered and prevent damage to the hub. Tighten the cover retaining bolts to 97 inch lbs. (11 Nm), then remove the seal centering tool.
Install the lower radiator hose clamp at the water pump, then install and secure the oil pan, as applicable.
If removed, install the oil pan.
Install the crankshaft pulley and hub.
Reposition and secure the alternator with brackets.
Install the serpentine drive belt, then install the upper fan shroud.
Reposition and secure the power steering reservoir.
Remove the engine rear plate/converter housing cover.
Remove the retaining bolts and remove the oil pan.
Clean the gasket mating surfaces thoroughly.
Trial fit oil pan to cylinder block. Ensure that enough clearance has been provided to allow the oil pan to be installed without sealant being scraped off when pan is positioned under the engine.
Apply a bead of silicone sealer to the oil pan flange. Also apply a bead of sealer to the front cover/cylinder block joint and fill the grooves on both sides of the rear main seal cap.
NOTE: When using silicone rubber sealer, assembly must occur within 15 minutes after sealer application. After this time, the sealer may start to harden and its sealing effectiveness may be reduced.
Install the oil pan and secure to the block with the attaching screws. Tighten the screws to 80-106 inch lbs. (9-12 Nm).
Install a new oil filter.
Install the engine rear plate/converter housing cover.
OIL LEAKS UNDER CAR COULD BE COMING FROM LEAKING OIL FILTER OR OIL PAN GASKET.CHECK FOR OIL LEAKS AROUND REAR MAIN OIL SEAL AND FRONT TIMING COVER CRANKSHAFT SEAL LEAKING OR LIP SEAL AT THE LOWER TIMING COVER TO OIL PAN.
You do not need to remove the upper oil pan. There are 2 bolts that go through the oil pan into the front cover that has to be removed. You do not need to remove the transfer case to remove the front timing cover. After you have the bolts under the front cover that go through that lower oil pan, and the bolts all around the timing cover off, just work the cover slowly till it pops free.
do you have a 3.1L V6? The timing cover gasket seals the timing components, it is located behind the belt drive system (alt, a/c, p/s etc.) all of these components must be removed to change this gasket, also the oil pan lower seal gets changed at the same time. The oil pan gasket includes the rear pan seal and the side seals and on for the rear of the pan, the engine must be lifted out of it mounts to change this gasket. It takes time to do these repairs and each shop has an hourly rate per hour on labor. The cost of the parts will be relatively the same at any shop, labor will differ. I hope this helps to answer your questions.