1949 Ford engine problems

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brandonstc

Member
I have a 1949 ford pickup with a flathead 6. I rebuilt the engine and put new rings, bearings and gaskets in it. I also had the valves ground, then ground the seats, lapped the valves and checked the valve clearance. The truck ran great at first. Now with 30 miles on a rebuit engine, the truck runs really rough and smokes. The trucks runs better and doesnt smoke at about 1500 rpm. After running the engine for a few minutes, the smoking goes away and the engine runs good at all rpms. I am thinking the oil relief valve is bad? If it is bad, where can I buy a new one. My oil pressure is 45 psi. I has a new carburetor, fuel lines, new fuel pump, and new fuel filter. Any answers would be appreciated.
 
I only have this problem when I let the truck sit for a day or more. The engine quits smoking after a few minutes of running.
 
when the engine is at its worst running pull the plugs and see which one or ones is fouled with oil then take a compression test also the best way to seat the rings on some of these old girls is to run a straight 10 wt.oil get her hot then let her cool down then run her again keep us informed
 
Did you install new valve guides or have the old ones knurled? Sometimes worn intake guides will cause this.
 
Was the engine removed to do this work.How were the cylinder walls deglazed,what lubricant was used during this operation?
What was the cleaning method used after the deglazing?What was the bore size at the time you began to rebuild?Your oil pressure relief valve really doesn't come into play with this problem.

R
 
The engine was removed. I removed the ridge and then deglazed the cylinders with a hone and then cleaned them with warm water, then with wd-40. The hone was lubricated with wd-40 while honing. I oiled everything with 30 weight oil when re-assembling. I am using 30 weight oil in the engine now. The engine is. 040 oversized. I checked the ring gap, the taper and out of round and they were all within tollerance.
 
Do you have a single or double (vacumm) acting fuel pump? A hole in the vacumm diaphragm will sure make one smoke. Ask me how I know.
 
I have just the single fuel pump. I added 5 gallons of gas to the tank and it runs a lot better. It still smokes on startup. I know I am loosing oil, because the oil level goes down with use.
 
Might "Kick a dead dog and see what happens". Might try a can of "SeaFoam" in the crankcase. I had same smoking issue after sitting for the winter a couple years back. Seafoam fixed the smoking problem (so far). Nothing to lose.
 
if it quits smoking after a few minutes its the intake guides or seals that are bad, worn rings will make the engine smoke all the time, even worse when you let up on the gas and decelerate in gear
 
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