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Re: Fuel in oil, rover 3.9 v8
If your rocker shaft was busted and the valves were not opening, alot of the unburned fuel in those cylinders will end up in the crankcase. the problem is that fuel dries things out and hinders lubrication, the crankshft and camshaft bearing and journals can become damaged. fix your rocker, put fresh oil in, then change it a second time after about an hour of running, use a quality oil additive like MOA or Lucas stabilizer in the second change. low oil pressure can indicate worn crank and cam bearings and or journals.
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Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.
How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.
I hope this helps you determine what could be causing your engine smoke
bent push rods come from improper movement of the rocker and valve
This can be from an incorrect length push rod-- some v8 engines run different lengths for inlet and exhaust
from rocker arm jamming on the shaft or rocker ball
hydraulic cam follower pumping up and jamming the valve spring to a solid block
bent valve stem above the valve guide
valve spring Colette moved or misplaced incorrect rocker for that valve-- some engines run different length rockers for inlet and exhaust
what to do-- if this engine was running all right for some time then the rocker can be omitted. if the problem has been occurring since the cold weather the the oil may be too thick and not allowing the follower to leak down properly
check the follower or replace it , change to a lighter viscosity oil for the duration of the cold weather
unless you have had a recent head change or other mechanical work done the problem will be in those areas.
In the case of an ohv engine, lubrication to the top of the engine is often regulated so relatively little rises to fill the hollow rocker shaft and then ooze out and trickle along the rocker arms.
In the case of an ohc engine a great deal more oil is needed and if the design doesn't provide a large oil reservoir around the camshaft, which most do not, the oil is needed very quickly after start-up and so the supply tends to be copious and regulated only by the size of the oilways.
ohc engines have such a vigorous supply of oil to the valve gear it is impossible to run most of them without the cover for the purposes of checking, for more than a few seconds.
ohv engines often need to be run without the cover for maintenance and while a few spit drops of oil skyward most do not.
which engines, you do know the engine size, type ,name and gas/diesel , dictates what fuel system you have, right?
most gas cars, USA have moved this to the inside of the gas tank
by uSA EPA edicts. i sure as heck cant speak for non USA cars.
lacking the engine facts or country.
gen4, line up
3.0 L V6 Petrol
5.0 L V8 Petrol
3.0 L V6 Diesel
4.4 L V8 Diesel
state side the EPA mode the filter inside the tank. to lower fuel heating and bingo evaporation losses (fact)
rain water will not get into the oil unless you had the rocker cover off and working on the engine outside in the rain.
water in the oil is coolant getting into the oil either from a head gasket problem or corrosion holes behind the water pump impeller. If there are loose rockers when running then there may be a blockage in the hydraulic followers for those rockers or there is wear in the rocker bushes and on the rocker shaft.
There is no such thing as a rocker shaft. There is a cam shaft, rocker arm assembly, Rocker arm, lifter etc. If you are talking about the rocker arm assembly that bolts to the head, it is 58 Ft/lbs. If you are talking about the actual rocker arms, you tighten them till they contact the push rod and the valve stem and then you put oil control clips on so the oil does not spray and you start the engine. You tighten them down till the chattering noise goes away, then back them off 1/8 to 1/4 turn.
are you serious? Aside from that question. If there are rocker arms missing it could affect the oil pressure. Are the oil feed holes in the area of each missing rocker plugged off?
Perhaps I had better back-track here. If the oil lube system has no restrictions in it then there will be minimal oil pressure developed. The oil pump will be pumping oil to the lower end of the engine and that will be where oil press if any will be developed.
The rocker area has drillings which restrict the oil delivery from the pump, however, the rocker arms themselves offer resistance to the oil supply and the oil must have enough flow and pressure to form a circle of oil within the rocker arm and thus keep it clear of the shaft. The oil flow goes through the rocker arm, and down over the valves and pushrods,(if fitted) and drops back down into the oil pan. Different set ups can be used, but that's a basic configuration.
The engine lubrication is designed with certain resistances, and they in turn affect the flow of oil and the pressure developed by the pump.
I assume you have the 4.0L engine. Your rockers are probably worn out where they contact the rocker pivot. I have seen this several times. It is due to low oil pressure. Replacing the rockers and pivots will help the problem with noise, engine not running properly, etc. but it will only do it again unless the low oil pressure problem is fixed. It usually requires replacement of the oil pump to fix it. While the oil pump is being fixed, the main and rod bearings should also be checked. I have done a couple of these where the rockers were completely worn out but there was no apparent damage to the main and rod bearings. I have also done a couple where all the bearings were trashed as well.