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Minneapolis Moline Tractors Discussion Forum
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za fowling plugs

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newtothisgame

07-19-2007 08:52:55




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drove my z in a tractorcade and all of the idoling killed my plug on #4 and the plug is oily the cylender has 90lbs compression yet wondering am i getting oil from bad rings or maybe the valves or should is there a hotter plug for that than R45




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havvey

07-19-2007 12:02:52




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 Re: za fowling plugs in reply to newtothisgame, 07-19-2007 08:52:55  
90 sounds a little low. The way there built i would suggest rings. put piston near tdc (close all valves) on that cylinder and put air to it. (use an old plug and make a fitting). if air is going into the base massivly it is rings, piston, jug. If it comes out the exhaust or carb there is a valve seat problem If in the radiator there is a gasket or crack. Test all 3 other cylinders and see what the average compression is. Use a hotter plug if you do not want to repair it.

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T.R.K.

07-19-2007 18:31:54




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 Re: za fowling plugs in reply to havvey, 07-19-2007 12:02:52  
I expect that the oil ring is not doing its job.

I was told that it was impossible to get the r46 series plugs any more. There may be some NOS somewhere. Or a hotter Autolite plug.

Probably 90lbs compression would be o.k. But that is for the compression rings, not the oil ring.

Remember its an L-head and probably has only 6-1/2 to one compression or some such. I have seen 2 different engines so far that would start and run well with only 35 lbs or measurable compression at cranking speed.
One was in a Ford Jubilee and the other was in a 1966 chevy pickup.

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