Question about 1948 Humber Pullman

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What can i do about oil on spark plugs?

I have oil on No 2 sparkplug what can i do? please it's a 1934 side valve humber snipe80

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  • helen
    helen May 16, 2014

    thanks John yu sound like you what your talking about i agree as much as

  • helen
    helen May 16, 2014

    i agree as much as i dont want to think about the rebuild is the way to go, thank again helen



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If you have a plug in a particular cylinder oiling up all the time, it is an indication that there is excessive oil getting into that chamber. As it is a side valve engine then valve stem seals can be discounted although worn valve guides might be a problem. The oil has to be getting past the oil ring by either a weak/ worn ring , broken ring or a score in the bore from wear or a broken ring other than the oil ring. IF the ring/ bore is in good condition ( compression test will indicate that) then the last possibility is that the con rod bearing ( big end) has excessive clearance and the oil sprayed from the bearing is overloading the oil ring. If you have an oil pump ( many engines of that vintage used splash fed bearings) then test the oil pressure . Because it is only in one cylinder then the problem is contained to the areas of that piston. Rings -bore and bearings . Pulling the sump and the big end off that rod will eliminate the bearing ( check clearance and bearing condition and if you put the piston up to the top of the bore you may be able to inspect the cylinder walls using a video scope (inspection camera) to check for score marks that would indicate ring failure. Using the hottest correct plug available may reduce the problem but unfortunately it is more than that

Posted on May 18, 2014

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Well this could have a lot of solutions, ranging from head gasket, piston rings, worn valve guides and even a blocked crankcase breather. But if you don\'t want to go to all that much trouble and just want it to run without oiling the plug, there was a little trick we use to do to hide this problem, and that was to use a sparkplug extension piece that screwed into the head and then you screwed to plug into that, I don\'t know if you can get one of those anywhere, I use to have a box of them knocking about, but I will have probably dumped them by now, maybe you could get one made. Just a thought though, with the engine being a side valve it probably has short reach plugs in it, but on the off chance that it has long reach plugs, another quick fix is to use a short reach plug in that cylinder, The effect of doing this was to move the plug away from any splashing oil and the engine would still run but would burn the oil instead of oiling the plug. Another hiding fix was to use a large overcoat button, as the cars use to use copper wire HT leads and not the carbon ones that are used now, you would take one end of the lead and put the wire through 2 of the holes, then put another piece through the other 2 holes and continue to the plug, This would make the spark jump the gap in the button before it went to the plug. The result was to retard the timing of that one cylinder, which in turn made it run slightly hotter and it would burn the oil away. As I have said these are just ways to hide the problem and are not a cure. unfortunately the only true fix is to strip the engine and do the job properly.

Posted on May 16, 2014


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