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First Manx/Inter SOHC engine strip/rebuild

Discussion in 'Other Norton Motorcycles' started by NKN, Dec 6, 2018.

  1. NKN


    Mar 28, 2016

    Going to strip my first Manx/Inter SOHC engine:

    - Anything special I should take care of?

    - Is there anything easier to do while engine in frame? Like taking valves springs off, unscrewing crank nut or whatever...

    - And for rebuild?

    Last edited: Dec 6, 2018
  2. Burgs

    Burgs VIP MEMBER

    Dec 14, 2013
    Hi Christian
    Not sure about the long strokes, may be take the cam box off and the head, have you a set of valve spring tongs, makes it easy for removing the valve springs.
    I bought a valve tong from Ken McIntosh, works great.

    Removing the cam box and head makes lifting the engine easier, better clearance and less weight.

    If you take the valve springs off, you will need to hold the valves in the closed position with an O,ring or something, otherwise they drop down and get in the way.

    Head nuts are usually a set, mine were simply stamped with a centre pop.

    Keep the valve leg plates and shims as a set ie exhaust one set and inlet one set as these should have been set up for the correct spring height, if you fit new valves or you have the seats reground the heights will change naturally, but it still gives a good starting point.

    Make sure you keep the Oldham couplings as a set, you will most likely find they are marked, mine were marked for Identification, the drive spindle should also be marked top bottom.
    Undoing the engine sprocket would be a good idea, knock up an engine stand and do the rest on a bench.

    Loosen the crankcase bolts before trying to remove the barrel as sometimes the barrel can be hard to get out.

  3. NKN


    Mar 28, 2016
    Have done some to work on a 500 Saturno, by modifying an old boilermaker's pliers.

    Was thinking about that first, but now would like to know the compressioin ratio before opening the engine. Might just take the cambox off before bringing the engine on the bench to measure the combustion chamber volume.

    OK, thanks for those good practice tips.


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