BMW E46 N42 Valve timing procedure, DIY guide.
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  1. #1
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    BMW E46 N42 Valve timing procedure, DIY guide.

    BMW E46 N42 Valve timing procedures.

    Removal/installation of timing chain requires:
    Sump removal.
    Engine at TDC on No.1 cylinder.
    Insert flywheel timing pin
    NOTE: Engine should not turn if flywheel timing pin fitted correctly.
    Ensure rear of camshafts correctly aligned
    NOTE: Curved profile at rear of camshaft points upwards
    Ensure camshaft adjusters set in the installation position as follows:
    Install inlet camshaft turning tool at rear of camshaft. Tool No.11 9 270.
    Attempt to turn inlet camshaft slowly in opposite direction of rotation.
    If camshaft turns, continue turning until locked in position.
    Attempt to turn exhaust camshaft slowly in direction of rotation.
    If camshaft turns, continue turning until locked in position.
    NOTE: In the installation position camshafts cannot turn freely. Replace camshaft adjuster(s), if not locked in installation position.
    Install inlet camshaft alignment tool
    Install exhaust camshaft alignment tool
    Timing correct when inlet camshaft alignment tool abuts cylinder head or is raised up to a maximum of 0,5 mm on exhaust side. Timing correct when exhaust camshaft alignment tool abuts cylinder head or is raised up to a maximum of 1 mm on exhaust side.
    If not, adjust camshafts as follows:
    Slacken bolt on each camshaft adjuster and then re-tighten by hand
    Install inlet camshaft alignment tool
    Align inlet camshaft. Ensure inlet camshaft alignment tool abuts cylinder head.
    Install exhaust camshaft alignment tool
    Tighten exhaust camshaft alignment tool to cylinder head.
    Tighten bolt on exhaust camshaft alignment tool until it rests on inlet camshaft alignment tool
    Tighten inlet camshaft alignment tool to cylinder head
    Remove tensioner
    Install timing chain pre-tensioning tool
    Tighten adjusting screw until in contact with guide rail. DO NOT overtighten screw.
    Replace bolt on each camshaft adjuster and re-tighten by hand
    Install sensor gear alignment tool and secure to cylinder head
    Slacken bolt of each camshaft adjuster by half a turn
    Pre-load timing chain with tensioning tool to 0,6 Nm
    NOTE: Bolt for camshaft adjusters MUST only be used once.
    Tighten bolt of each camshaft adjuster
    A - N40/N45. Tightening sequence:
    First stage - 20 Nm.
    Second stage - 90.
    Third stage - 90.
    B - N45T. Tightening sequence:
    First stage - 20 Nm.
    Second stage - 180.
    Remove flywheel timing pin
    Remove sensor gear alignment tool
    Remove camshaft alignment tools
    Remove timing chain pre-tensioning tool
    Install tensioner assembly. Tightening torque: 65 Nm.
    Turn crankshaft two turns clockwise.
    Ensure flywheel timing pin and camshaft alignment tools can be refitted
    Timing correct when camshaft alignment tools abut cylinder head
    NOTE: Crankshaft pulley central bolt MUST only be used once.

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