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Re: Gas in the oil on my 93 nissan altima GXE
Only one reason fuel is in the oil. Somehow it got past the rings. You have a fueling issue. Your way overfueling. Most likely a sensor needs replacement or even a fuel pump may too much pressure or is you have a fuel return line it may be plugged or pinched. This is not a reason to take off the head unless you had low compression before this happened. If you have low compression now you may have what we call washed cylinders. Try squirting a little oil into eacdh cylinder. And crank. If the compression gets alot better this points to rings not sealing. What may of happened was you had an ignition misfire which allowed just fuel to enter the cylinder. This unburnt fuel will eventually ruin a cylinder wall if run long enough. We just diagnosed a truck that drove 400 miles with a dead miss. It scored the cylinder so bad the engine was destroyed.
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Check your owner's manual for the recommended mileage for
replacing your timing chain. Replacement for a Nissan Altima is 60,000
Locate the timing chain. Replace it if the automatic chain adjuster (also known as the tensioner) is damaged or worn.
Drain the cooling system and disengage the negative battery
cable. Undo the spark plug wires and set the No. 1 piston at "Top Dead
Center" (TDC) of the compression stroke.
Disconnect the engine undercover, vacuum and fuel hoses,
harness and connectors, drive belts, power steering reservoir,
alternator and bracket, upper radiator hose, air duct, front exhaust
tube, intake manifold collector supports, collector and exhaust manifold
and the distributor.
Prop up the oil pan and take out the front engine mounting,
the valve cover, camshaft sprockets, cam bearing caps, camshafts,
cylinder head bolts (reverse the installation order), cam sprocket
cover, upper chain tensioner, chain guides and chain, idler sprocket
bolt, cylinder head, intake manifold and cylinder head gasket and the
steel oil pan.
Place a steel cutter between the steel and aluminum oil
pans. Slip the cutter around the oil pan's edge. Disengage the steel oil
pan, baffle plate, oil strainer and the front tube.
Secure the car on jack stands and place a seal cutter in
between the oil pan and cylinder block. Slip the cutter around the oil
Install Your Timing Chain
Reconnect the crankshaft sprocket, oil pump drive spacer,
idler sprocket and lower timing chain. Position the lower timing chain
on the sprockets and line up the mating marks.
Rub on an unbroken bead of liquid gasket and put in a new
front cover and oil seal. Secure the bolt at 105 to 112 foot pounds
(142 to 152 Nm).
Eliminate any old material from the pan and cylinder block
mounting surfaces. Rub on a 3.5 to 4.5mm bead of liquid gasket over the
oil pan and cylinder block.
Attach the upper timing chain to the idler sprockets and secure the cylinder head bolts.
Refill the cooling system and add clean oil in the engine.
Hook up the negative battery cable and any other disconnected parts or items. Start the engine and look for leaks.
Tips & Warnings
Procedures for replacing timing chains in Nissan Altimas vary slightly depending on engine size.
Make sure the new timing chain matches the chain you are removing.
After 2002 Altima offers two types of engine: the new 4 cylinder 2.5 L QR model engine which is fairly powerful (175 horsepower) and, I believe, one of the best engine in its class the 3.5L V6 VQ model engine with 240 horsepower. The same V6 model as in in the Nissan Maxima, Pathfinder and Murano. Both engines feature continuously variable valve timing using a silent chain instead of timing belt. Throttle cable is gone - the throttle operates electronically by wire based on gas pedal sensor readings. This design provides smoother transmission shifting and lower emission. The 2007 Nissan Altima 3.5L Sedan, has a Timing Chain, and an Ignition Coil Pack. NO DISTRIBUTOR.
I think it has a chain. look where the timing chain/ belt should be. if there is a large plastic cover, it has a belt, it its a aluminum cover, it has a chain. there is no replacement interval on a chain.