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I have a mitsubishi l300 with a 4G64 engine I have just replaced main bearings it ran ok but now it's blowing smoke. Compression is ok but all the plugs are dry black as if it's getting too much fuel

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F]ENGINE Workshop Manual 4G6 (EW) -

you have to run it in and wait and see
you may burn up a set of plugs

renew main bearings only raise the conrods and pistons
so piston and rings will run in a different position up the cylinder wall

only doing mains and not conrods and re-ring is a strange thing to do

Posted on Apr 16, 2017


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What else can i do to solve compression pressure in the sump on a Hyundai H100 2012 2.6D bakkie? oil was blowing from the dipstick now pouring from the crank rear main seal.

First thing ,,,Is to remove dipstick and run engine [now how much back pressure have you got] if none ,ok .what is the oil pressure when cold,and when hot , should be very little differance, what ring gap did you give the rings when they were fitted. and was the rear main seal a good fit or loose fit ,,,and as for fitting new oil rings AGAIN and that stopped the pressure in the sump from blowing out the dip stick hole well THE compression rings are the ones which should have been checked for the correct gap and at -003thou per inch per bore,as the oil rings are only oil scrapers, and compression rings are for Compression is what you have a lot of in the sump.
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2002 ford focus 2.0l sohc blowing white smoke and loud noise like a knocking from the bottom of the engine or/and rough idle,what could cause these

If a vehicle is smoking then it is obviously burning oil, loud noises from bottom of engine usually indicate main bearing failure, but that wouldn't usually make smoke are you sure it is from bottom of engine. Sounds more likely to me that you have either valve or piston problems, a valve seal gone would result in smoke as oil leaking into Cylinder chamber would burn producing smoke. Piston ring failure would also produce smoke and most likely a significant loss of power with possible noises resulting from broken pieces of ring in the cylinder impacting on head, this may have also unseated a valve causing the smoke. To check ring or valve failure you need to do a compression test, to check for bearing failure I am afraid it will require inspection either by removing sump pan ( oil pan) and removing bearing covers to check for damage.Whatever the cause it sounds as if it may be quite expensive and age and condition of vehicle should be taken into account, after all with the cheap cars on ebay it may be more cost effective to cut your losses and replace the vehicle.

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That is probably the head gasket leaking. White smoke is from antifreeze going through the exhaust. The engine compression is pushing the water out of the radiator.

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blowing blue smoke means burning oil. a compression test can help pin point where oil is leaking in the cylinder(s). remove all of the spark plugs and check the compression pressures of each cylinder. If the lowest pressure reading is within 10%-15%, you can assume that the lower half of the engine is Ok. one at a time, squirt a few drops of engine oil in the spark plug hole and check the compression pressures again. a big increase in pressure means poor piston rings. very little or no difference in pressure means valve train leaks. like valve guides or seals.

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1 Answer

Have a daewoo 2001 legacy se overfilled the oil and car started sputtering and stalled out pulled the plugs and had oil on them and car was blowing white smoke took valve cover off and cleaned most of oil...

OK here is what happened. With the oil overfull, the connecting rod caps, which usually don't dip into the oil, started whipping the oil, creating whipped lubricant that the oil pump couldn't draw in. This more than likely resulted in the loss of lubrication to the camshaft bearings, rod and main bearings, piston rings and walls and the camshaft and rockers and valve system.

Depending on how long the engine ran, the bearings may have spun, keeping any oil from being sent to some bearings, the cylinder walls and piston rings may have worn too much to provide proper compression.

The oil pump probably suffered also.

If you ran it a long time that way with the oil light on, find yourself a remanufactured engine or a used engine & save the headache and expense of rebuilding this one.

If it was for just a few minutes, pull the plugs, put a table spoon of oil into each cylinder to lubricate & seal the piston ring to the cylinder wall for compression, change to a higher gade of oil, crank the engine to try and build oil pressure, reinstall plugs, try and start.

good luck.

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The plenum problem should not affect compression tests. It allows oil to get sucked into the intake and will cause carbon buildup, plug fouling, and pinging. If you have zero compression on a cylinder, it is usually a valve problem. Even a burned piston will make some compression, unless it has a big hole in the middle.
Sorry, but if your compression results are to be trusted (and it seems they are), then you have to tear a head off to find the problem, or at least get a borescope in it.

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Ones the diesel engine gets weak its thn a hard start!, becausea diesel engine mainly fires up on good compression, i guess its time for an engine overhaul .

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This sounds like the timing belt is shot. Remove the distributor cap, have your helper crank the engine. Is the rotor turning?? If not, then it is the timing belt. Some engines are rather forgiving when the belt breaks, some will get bent valves. Frankster016

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