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Thread: Camshaft adjustments for performance improvement

  1. #61
    Senior Member
    Join Date
    Jan 2014

    Re: Camshaft adjustments for performance improvement

    EPC documentation says that conical spring inside cam adjuster has changed several times. Spring diameter has grown from 2.1mm -> 3.0mm. Any idea what problems that older style and probably weaker spring can bring? Thanks

  2. #62
    postwhore posterchild Klink's Avatar
    Join Date
    Feb 2014
    Abstract Plains, USA

    Re: Camshaft adjustments for performance improvement

    The spring changes were made to minimize rattling noises, especially during start up. There is no change in the performance. And for those that may not know, the cam adjusters on the M119 are not continuously variable. The solenoid and it's dependent valve are either fully open or fully closed, and the camshaft is either fully advanced or fully retarded.
    Last edited by Klink; 04-17-2017 at 12:24 PM.
    Putting the fun in dysfunction...

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  4. #63
    Senior Member
    Join Date
    Jan 2014

    Re: Camshaft adjustments for performance improvement

    I translated that AMG 500SL 6.0 document camshaft section:

    intake and exhaust camshafts have a modified cam profile. Camshafts are marked from the rear on the flange: • Inlet camshaft with "15", • Outlet camshaft with "1 O"

    Control times The valve drive is set to the changed control times. The values for cylinders 1 and 6 can be read directly on the vibration damper.

    Setting control times

    The control times are adjusted by turning the camshaft adjuster on the inlet side and the camshaft wheel on the outlet side. For this purpose, the 3 holes 0 7.45 H12 of these two parts are machined into oblong holes. The locating pins in the camshaft flanges must be omitted because of the possibility of twisting. The dowel pin hole in the flanged shaft is closed by a cover. The oil inflow and outflow in the flanged shaft are reduced so that they are not covered in the extreme positions.

    Basic adjustment

    1 Assemble the valve drive. Make sure that the dowel pin holes of the flange shaft or the camshaft gear and the camshaft flanges are superimposed.
    2 On the exhaust-side camshaft gears, it is only necessary to tighten the 3 collar bolts in the center of the long-hand chain.
    3 Set the "X" between the screw head and the lowering of the flange shaft to 8.5 mm on the left cylinder row (cylinder 5 -8). 3.2 Set the right cylinder row (cylinder 1 -4) to "7.8" Mm.

    Fine adjustment

    1 Determine control times. To do this, place the probe on the dial gauge on cylinder 6 and cylinder 1 vertically with a 3 mm preload. Note intake and exhaust timing at 2 mm valve lift.

    2 In the case of deviations from the setpoint value:
    inlet side
    2.1 Remove timing chain and camshaft adjuster as far as the flanged shaft, loosen the collar screws and correct the ratchet position of the "X" .
    Note: A deviation of the crankshaft angle by 2 (= 1 camshaft angle) 0,6mm at the circumference of the mounting hole circle of the flange shaft
    2.2 Reassemble the valve assembly.

    On the outlet side
    2.3 Place the measuring probe of the dial gauge vertically on the corresponding pushrod with a 3 mm pretension.
    2.4 Set engine to 14 before TDC.
    2.5 Loosen the collar screws of the camshaft sprocket lever-II and the camshaft m, t spanner SW 27 between the cams 4 and 5 so that the 2 mm valve stroke is reached.
    2.6 Tighten the bracing screw to 18 Nm.
    3 Check the control times. '.... a deviation from setpoint still exists, repeat operation.

    So there need to be some kind plug to intake camshaft where dovel pin located? Or in camgear?

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