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Re: WHEN REPLACING THE HEAD GASKET.
Yes, the chain has to come off. The cam gear that is driven by the chain is mounted on the cam, inside the head, and the crank pulley down at the bottom is what drives it via the chain. The chain has to be removed in order to remove the head.
Usually the pulleys are mounted onto their shafts with a bolt through the center of each pulley. That will have to be loosened and removed (which is much easier if it's loosened before you remove the chain, so that the chain holds the pulley still and keeps it from moving). My question is, why do you need to remove the pulley? Once the chain is off, and everything else is disconnected, the head will lift off with the pulley intact, and the crank pulley doesn't need to come off as it has nothing to do with a head gasket service. Is there another issue that requires the pulley to come off, or are you replacing the head with one whose cam pulley is missing?
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Dec 30, 2012 - Uploaded by Bullshitkorner
The most important part when doing timing gears on a engine is ... Doing this inside the engine bay will be a bit of a pain in the axx but it is doable for sure. ... How to build a Chevy 383 Part 3: How To Install a Cam & Timing ...
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.
Get a Haynes or Chilton's Manual on your vehicle so you have the correct sequence for removing the head bolts and for putting them back. While you have the heads off and the timing chain loose replace the timing chain and make sure you have the heads resurfaced and valves adjusted. Might as well do all of this at once so you don't have to worry about it doing it in 10k to 20k.
You have to remove the oil pan - harmonic balancer - timing cover to replace timing chain... to replace cylinder head gasket and not the chain -- you need an assistant to hold the camshaft gear with chain on it. Suspending it with wire to keep the chain from moving the timing (do not let the chain relax as it will come off the crankshaft gear and change the timing)
no adjustment neccesary. There is a timing chain tensioner, which you will simply push back in to its body. once you do that, there should be a small hple somewhere on the body of the tensioner. That' sthere so you can piut a paper clip into it to keep the tensioner from coming out. Once you lock that in place you can remove the tensioner and than the timing chain.Once you get it all back together, just pull back on the pin and the tensioner will come out and put tension on the chain. good luck.
there is a special tool. it holds the chain against the hydraulic tensioner and on the cam sprocket. you need this to prevent tensioner from loosing its prime and keep the timing from moving. once tool is in place remove bolt holding cam sprocket and you lift head off leaving chain and sprocket in place.