Oil from Exhaust Pipe?

Bruce of MN

Bruce of MN

Well-known member
I have started up my engine after new rings, valves & seats, insert mains, clean up, and fresh paint. White smoke (lots) comes from the exhaust and it blows oil out! Yesterday, it left a puddle 6" in diameter. Since the oil isn't pumped as high as the exhaust ports, the source is a mystery to me. The manifold was clamped to the exhaust when I got it, so the previous owner shouldn't have poured oil there, for whatever reason. Should I drill a small drain hole at the low point?

Any ideas?
 
Bruce of MN said:
I have started up my engine after new rings, valves & seats, insert mains, clean up, and fresh paint. White smoke (lots) comes from the exhaust and it blows oil out! Yesterday, it left a puddle 6" in diameter. Since the oil isn't pumped as high as the exhaust ports, the source is a mystery to me. The manifold was clamped to the exhaust when I got it, so the previous owner shouldn't have poured oil there, for whatever reason. Should I drill a small drain hole at the low point?

Any ideas?
Click to expand...
if it doesnt quit in a short while i would suspect you have a few rings lined up, not staggered, orsome broken ones, do a compression check and check the plugs as you pull them, the bad cylinders will show up on the plugs as oil fouling


the hurrier i go the farther behind i get
 
Is it white smoke or light blue? White smoke is water (coolant), blue smoke is oil. If it's a brand new start up, it could just be residual oil from your rebuild. Do the check as ford1 suggested; I would also check the torque on your head nuts - could be a leaking head gasket, although if it's that loose, you should be pushing combustion gases into the cooling system as well.
 
Hi Bruce,
I often see smoke when an engine is first started. It will clear up pretty quickly if it is assembly lube and excess oil. Since you have only run the engine for a short time twice (minutes). Take the time to verify you have proper oil flow. Loosen the bottom of the external oil return pipe and place a tooth pick between the gasket and the inlet to the block to hold a gap. Start the engine...you should see oil pouring out from this location if the pump is providing proper flow within 30 to 45 seconds. If you do not see oil flow...shut it down to avoid bearing damage. If you have oil flow, quickly pull the toothpick and tighten the bolt. Now that you have confirmed the valve chamber is being supplied with oil you can run the engine speed up to start the seating of the rings. Run the engine at a very fast idle to start the seating. Try to avoid a slow idle as the rods will not be throwing enough oil around the crankcase to properly lube the cylinder walls during the ring seating. If you have continued white smoke look for a coolant leak...check for bubbles in the radiator as a starting point. Let me know what you find. You will have to put a couple hundred miles on the engine before you will be able to set your carb for good idle. If the smoke continues, complete a compression test. I just completed a compression test on a newly rebuilt engine that had about 45 minutes of running at about 2000 rpm to seat the rings. The results were 81, 80, 80 and 78. You should get close to this. What you are looking for with the test is a consistant compression between cylinders.
Good day!
Dave in MN
 
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