Question about 1998 Saturn SL

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WHEN REPLACING THE HEAD GASKET.

WHEN CHANGING THE HEAD GASKET DOES THE TIMING CHAIN HAVE TO COME OFF ? HOW DO YOU GET THE PULLIES TO COME OFF ONCE THE BOLT HAS CAME OUT OF IT?

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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?

Posted on Sep 09, 2008

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I NEED TIMING CHAIN DIAGRAM FOR VQ20 NISSAN SERFIRO 1999


Instructions
  1. Remove Your Timing Chain
    • 1 Check your owner's manual for the recommended mileage for replacing your timing chain. Replacement for a Nissan Altima is 60,000 miles.
    • 2 Locate the timing chain. Replace it if the automatic chain adjuster (also known as the tensioner) is damaged or worn.
    • 3 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.
    • 4 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.
    • 5 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.
    • 6 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.
    • 7 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 pan's edge.
    Install Your Timing Chain
    • 8 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.
    • 9 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).
    • 10 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.
    • 11 Attach the upper timing chain to the idler sprockets and secure the cylinder head bolts.
    • 12 Refill the cooling system and add clean oil in the engine.
    • 13 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.

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1 Answer

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Trying to put timing chain back after replacing head gasket on a Nissan N22 motor. Need to find adjustment to loosen timing chain so that i can attach timing gear with chain onto OH cam. can you help on...


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1 Answer

Changing a head gasket on a 1984 rodeo 2000 g200 kb28 with a sohc. How do i take off the timing chain?


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Jul 08, 2008 | 2000 Isuzu Rodeo

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