car runs good but smokes,has oil around front plug after running a while. has great compression, could this be a valve guide problem or even an oil ring? have been putting marvile mistery oil in plug holes way before trying to crank he up,since she had been sitting for 16 years.this is a low milage car, 7k. engine has never been into. help,if I am going to start turning wrenches I want to do it right.
sounds like front cylinder is not firing or valve may be stuck open, check compression on all four.
Thomas, if you are saying that oil is coming out around the threads of the plug, then you should seal the threads with pipe dope or such. A loose plug will cause it to pump oil. KB
First off you say the compression's good. I don't know how you know this but assuming you're right you might not be seeing oil at the plug threads but un-burnt combustion residue. Now as Joe mentions (and I heartily concur) a comprehensive compression test, first dry then with oil squirted into each cyl, is the only way to go to figure out what your engine needs. If you want to do anything before turning wrenches a comp. test is it. Other's will disagree but it's my belief that due to it's relatively low compression (compared to a modern engine), that The T should be compression checked when cold. With a really great pressure of 60 Lbs. a 10 or 15 Lb. difference would be very noticeable and might be masked by heated/expanded parts falsely raising it. You want to know if there's enough compression to start it cold.
If the engine runs smoothly, that is on all 4, which can be determined by running it at a fast idle and grounding out the conductor at each plug one at a time. It should start to run rough and slow down a bit each time a plug is grounded. If it does what I have posted above, you are running on all 4. If it runs the same when one particular plug is grounded, that plug is not firing, or the compression is so low the cylinder is dead. First replace the plug and if it fixes the problem, you have a fouled plug. If not, something else. could be a timer or coil problem or valve problem.
Next thing to do is to seal the plug. If tightening it down doesn't keep the oil from coming up, try some pipe dope. I have also found that a piece of aluminum foil wrapped around the spark plug threads helps.
The oil leaking around the plug indicates you are losing some compression around the plug. Sealing it will raise the compression a little bit, but you will not be able to measure it because the plug is in the hole.
Next thing to do is to drive and enjoy the car. You can tell by driving it, how much oil you need to add and how often. Also driving it will tell you if it is using enough oil to foul the spark plugs. Smoking can also be caused by poor fuel mixture. Try leaning the carburetor until it starts to sputter and then enrichen just enough to make it run smoothly. Do this after the engine is warmed up. The other thing which will look like smoke is coolant leaking into the cylinder. This will appear as white smoke when you first start the engine and will clear up as it warms up. In that case you will need to pull the head to find the source. Could be a leaky head gasket or worse, a crack. Sometimes if the surfaces on the head or block are not flat, the gasket will not seal.
My suggestion would be to drive the car as long as it runs smoothly without a severe knock or sever oil consumption. It could even get better with running it.
Assuming you have not been running it for very long the smoke you are getting may well be from the Marvel Mystery oil you have been putting into the cylinders. If they are oil soaked it can take quite a while to burn it off. Another possible cause may be clogged return holes in the valve area or, if it is an early car, there may not be any return holes at all. As far as oil around number one plug is concerned I'd try to tighten it a bit when hot and if that doesn't work I'd coat the treads with pipe dope to stop the leak. That has always worked for me.
Thomas, you say a low milage never been into engine, if that's the case, it will more than
likely use oil, original T's had no oil rings and Ford Service of the day was, minimum oil and gas consumption, the rings should be renewed every 10,000 miles.
the engine has never been opened up? its very common to have stuck rings,
if its running smoothly and on all four, keep some MMO in the oil and in the fuel and go drive it. many times they just need to get worked and have all the junk blown out of them. if it doesnt clean up then pull the engine and "go through it" not rebuild necissarily, check and replace things as necissary, rings, hone, cam, gear yada yada. if its completely worn out then fully rebuild it.
7k miles can mean alot of things, friend of mine had a truck with 30k on it, engine was completely worn out. turns out those 30k mies were made on a farm. thats alot of driving!
Stop putting Marvel Mystery oil in the cylinders and it will probably stop smoking.