Question about 1936 Daimler Light

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Can you please advise the make and type of spark plugs suitable for the E20?

Make and type of plugs for E20

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This appears to be an old engine so what I would do is take an old plug out and measure the reach ( length of the thread from the base to the end of the thread ) next measure the diameter of the plug thread. The dimensions you get will read like 3/4 reach and 1/2 dia (19 mmx14mm) . Get a plug chart at your local auto spares store and find a plug that matches your dimensions ( the ones you have ). when you have a plug that meets your dimensions then check the chart again for the heat range . Select a plug around the middle of the range . Next check the protrusion of the centre electrode and opt for one that is level with the end of the plug. Through out the chart there will be many makes of plugs but which one you chose for that thread length and dia they will all be the same.

Posted on Mar 19, 2014

Testimonial: "Thanks Bill. Unfortunately the incorrect plugs are currently installed [They are 3/4 reach and I think should be 1/2 ].I feel I shall have to contact the Daimler Club in Melb for support. Many thanks for your effort , regards , Simon."

  • Bill Boyd Mar 19, 2014

    ok but if you do not get the answers you want then there is a check that you can do . Remove the plug and check the length of the thread in the head. Use a piece of bent wire against a ruler and from the bottom of the thread measure how far the wire moves out to get to the gasket base. The diameter will be the same . IF the plug fitted was too short then use a thread tap to clean out the thread of carbon before installing the correct plugs



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