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Thread: Inlet manifold cap

  1. #1
    Join Date
    19.06.2018
    Location
    Manchester
    Ducati models
    Monster s4
    Posts
    8

    Default Inlet manifold cap

    On my 2002 Monster S4 with the 916 engine I just want to make sure that I have not messed up the timing as I heard a spring noise. I was looking to give the inlet manifold cap covers a lick of paint but as I unscrewed the 2 Allen bolts and went to pull the cap off I heard a spring noise!!!! Have I done something wrong here or is it fine to take these caps off. I've attached a photo it's the top cap with the two bolts on on the horizontal. I just want to make sure I'm ok before starting the bike again. Thanks
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  2. #2
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,457
    I'm not sure which cap in the photo that you're talking off. The ones with 2 screws are the camshaft bearing supports, the one with 5 screws and a banjo is the rocker spindle retaining plate. There are no springs behind any of them

    Old enough to know better, young enough not to care

  3. #3
    Join Date
    19.06.2018
    Location
    Manchester
    Ducati models
    Monster s4
    Posts
    8
    Sorry but the picture has uploaded sideways on. It's the one with the 2 screws the circle shape one.

  4. #4
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,457
    Yes, camshaft bearing support. No springs in there but don't rotate the engine when any of them are off and it probably best to have the cylinder at tdc on the compression stroke with both valves closed when you take them off so there is no load on the camshafts. Do the horizontal ones first, refit them and turn the engine until both valves closed on the vertical, then do the vertical ones.

    Old enough to know better, young enough not to care

  5. #5
    Join Date
    19.06.2018
    Location
    Manchester
    Ducati models
    Monster s4
    Posts
    8
    If I take both spark plugs out and put the bike in gear and rotate the rear wheel will that be safe enough to check if there is no clashing then will be in turn safe enough to start the engine

  6. #6
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,457
    Yes. The only reason I'm advising not to rotate the engine with the caps off is because the cams would only be supported on one side.

    Old enough to know better, young enough not to care

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