I have a 1980 1600 nissan sentra, just changed ring and bearing, and new valve stem seals,gaskets etc, started car, and egnine burning and pushing the oil straight out the the manifold thru the exhaust..was not doing this prior to repair, please advice or assist,
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Re: nissan sentra 1.6 1980
Sounds like poor engine rebuilt work. The rings probably were not aligned properly. they need to be placed in their proper positions. The valves, guides, weak spings, etc. (Was your cylinder or head machined) Also you could have used incorrect rings-size. Keep looking online for manual guides
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depends on how the head was reconditioned were new valve guides installed along with new valves were the stem seals correctly fitted was a compression test done to determine the wear condition of the engine smoke on start up is oil in the combustion chamber from valve stem seals , worn rings , sump pressure from excessive blow by through the line to the air inlet check for oil leaks ( filter etc ) but using a lot of oil indicates ring problem, excessive bearing clearance overloading the oil control ring try using a heavier grade of oil 30w 50 or oil for worn motors
Usually the oil rings are gone in the engine & it will have to be removed for a major repair. However, it could be the valve seals (minor job) or a sticking /stuck PCV valve. Take to a garage & show him this answer.
If you are sure it has no leaks, the only other possibilities are worn oil rings or valve stem seals. Generally if the oil rings are worn then the compression rings are as well, so get a compression test. If readings are down on spec, which is about 150 psi., add a tablespoon of engine oil to each cylinder in turn through the plug hole. If readings rise, then it is worn rings at fault. If not, then suspect the valve stem seals.
On these engines though, there are several characteristic oil leaks which may be hard to spot, being the cam cover gasket, crank nose seal, and the distributor o-ring seal.
Hey Anon..this is a serious problem ONLY if you do not keep your engine oil level full...but you do need to get it repaired as soon as you can..
Sounds like you may only need new valve stem seals...BUT.. you need to check and see if your car smokes when driving.. especially when you are stopped at a red light, then take off again...Does it smoke then.>??? >> THIS IS IMPORTANT!!... It determines whether its rings and/or valve stem seals.. If it smokes after a red light.. it could be rings and valve stem seals.. If it ONLY smokes in the morning.. its a 99% chance its just worn out valve stems seals...
Find a qualified professional (ASE Certified or Toyota Factory shop) ..This is NOT an inexpensive fix..BUT - ASK if they will replace the valve stems seals without removing the heads..( I KNOW they can..its just a matter of WILL they!?!?)...BUT....The shop will want to rework your head(s).. called a "valve job" and this is normal,-- they will remove the head(s), all the valves, regrind their sealing surface and regrind the valve seats in the heads, install new valve stem seals, new intake gaskets, new head gaskets, fresh antifreeze..(get a new -QUALITY- thermostat and have them install it - no need to chance overheating your engine), they should "surface the heads".. giving them a fresh gasket sealing surface.. this will restore the sealing surfaces and help with the compression, and I would recommend letting them do it if you can!!....if you do this -- MAKE SURE you ask/demand for ALL your old parts back,-- all of them!! Good luck,, please mark as/if helpful...thanks!!
Depending on how bad it's burning oil, it can be results of the rings and valve seals going bad. Have you had any recent top end motor work. When rings are incorrectly installed (upside down, etc.) or the gaps are too wide or the cylinders weren't honed to match the material and/or finish of the rings, oil will get through. The same goes for the valve stem seals. If they are old and hard, they will allow oil to get by and into the combustion area. You can try to use an additive like CD-2 Engine Oil Stop Leak/ Heavy Duty Sealer
Hi :) What is happening? you say Well when you shut the engine down the oil is hot and it runs by the valve stems because the stem guides are warren out and sits on the piston till you start the engine next time. It take a bit to burn it off then it burns clean till the next time you stop running the engine for any lenght of time.Take it in to the shop and have new valve guides put in it or unbrella seals put on under the valve spring this will stop the oil from leaking past the valve stems. I put a cup of transmission oil/Fluid/Dexron2/3 every time i change my oil to keep my valve seals soft and rubbery and it helps
Hello, there are many reasons for an engine to burn oil. Replacing a head gasket will stop leaks in the head, but it is not a cure all. You can have bad compression, bad oil rings, and valve guides that are worn. A new head gasket can fix compression leaks between cylinders and oil and antifreeze leaks.
Overall bad compression means both the oil rings and power rings are worn out. You can have bad oil rings and still run reasonable well if the power rings are okay. The valve guides are the small seals on the stems and with an overhead cam they are in the heart of the engine. Sometimes when the valley of an engine is plugged up, the oil can not return to the crankcase fast enough. The pooling oil is more apt to lay by the valve stem seals and be drawn into the combustion chamber.
Also check the PCV valve which may snorkel up oil into the induction system. Another sign of bad rings is blowby on the vent pipe.