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Discussion Forum

Re: Blue smoke and loud engine knock after head reconditioni

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tophat47

09-06-2011 01:54:29
93.107.2.155



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Thanks to everyone & replying from the top down:

1) Diesel pump was reconditioned in the 1970's also.

2) Will check oil pressure: what oil pressure would be expected on this vintage of machine ?

3) Piston crowns were uniform black across their surfaces, no cleaned edges.

4) "Skimming the head" is the term we use here this side of the pond! (I'm in Ireland). I could see very fine cutter marks on the head see the attached photo. I don't know how much they removed. I didn't see anything untoward with No. 1 piston.

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cdmn

09-06-2011 19:08:12
66.228.231.151



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 Re: Blue smoke and loud engine knock after head reconditioni in reply to tophat47, 09-06-2011 01:54:29  

I have a 1956 Fordson which was shut down for a bad knock, and the seller told me to not start it because a rod was about to let go. I believed him, because I"ve seen Fordson engines in the salvage yard with No 1 rod out the side. (Also an NAA, and a 801, but No 4.) I took the pan off and found the rods good and tight. Noise came from front, so took the engine apart and found that the timing gear had broken its hub. Fordson changed the design shortly after.

It is also conceivable that the compression relief can cause pistons to hit valves.

There were several attempts to solve a headgasket problem. Involves protrusions on sleeves and different materials and thicknesses of head gaskets. Have to be careful with what you have. Wrong set up and piston could hit head. Might be a function of how warm the engine has gotten. Pistons and rods get longer, and oil films get thinner.

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