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Mountfield Sp536 valve clearances

Discussion in 'In the Garden' started by Richardsth, 16 Apr 2018.

  1. Richardsth

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    does anyone know what the valve clearances should be for a Mountfield SP536 lawnmower fitted with a RM55ES engine? Mine is having problems starting up again after it gets hot, and everything else has been looked at.

    Thanks All.
     
  2. Burnerman

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    Go for 0.10mm hot and you'll not be far off!
    OHV engines have a screw and locknut, side valves require the end of the valve stem grinding down.
    John :)
     
  3. Richardsth

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    Actually, I rang up servicelink today and they gave me the following information

    Inlet valve 0.10-0.15
    Exhaust valve 0.15-0.20

    I don’t know how true they were as my mower was well out. I’ll try it when it’s hot next time as that’s when it seems to be having problems.

    Cheers Rik
     
  4. Burnerman

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    With the engine steaming hot, whipping off the rocker cover and checking that you can still rotate the pushrods will give you a pretty good idea of how things are.
    These engines are prone to running hot, and fuel evaporation isn't unknown.....a tip is to give it just a shot of choke whilst pulling the cord-without over doing it, of course!
    John :)
     
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  5. Nige F

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    [QUOTE="Burnerman, , side valves require the end of the valve stem grinding down.
    John :)[/QUOTE]
    Have you ever done that to a SV mower engine - I can't imagine them lasting long enough to need that;)
     
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  6. Burnerman

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    Aye, they are getting less common due to their inefficiency so the OHV / OHC engines take over.
    Some of the large iron cylinder Briggs motors are SV though - and they have 'proper' ball bearings supporting the crank......a different machine indeed to the basic bushed engines of yore.
    John :)
     
  7. Richardsth

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    Just to get this thread back on track, servicelink did send me a workshop manual for this mower and it’s titled wbe-701, wbe-702 and wbe-704. I’ve attached it to this reply, so hopefully it will show up below.

    Cheers All.

    Rik
     

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  8. hardtail

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    do you have the number for the service link people as im after the valve clearence on a rm65 engine
     
  9. Richardsth

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