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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,
please drop me and email [email protected]
please this is urgent, i want to work on car this evening again,
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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normal running that warm up time. not stem seal problem unless it dose it all the time engine is running. could just be the engine needs a clean. try seafoam or fuel cleaner and do regular oil filter changes. if you are getting oil lose then check the cam cover gasket or the sump gasket. as these are the main leak areas apart from bain bearing seal. but there is gasket and bearing seal additives you can use to stop these.
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
black smoke --over fuelling, incomplete combustion
white smoke --too lean , water getting into the combustion chamber ( gasket)
blue smoke-- valve stem seal incorrectly fitted( old or worn,hard),oil ring failure, cylinder bore damaged, worn main/big end bearings overloading the oil ring,fauty pcv valve or EGR system
If doing the valve seals the head would most certainly need to come off and upon replacement a new gasket would always need to be used but whilst the head is off the engine check the bores turn the engine by hand untill the pistons go up and down to see what wear is on the bores unless whilst the head is off you go the whole hog and do the piston rings at the same time and the oil rings
No you can't..
Fitting valve stem seals involves removing the valve springs. This means the valve has to be held in place by a valve spring compressor (bought from almost any spares outlet). The springs are compressed by placing one end of the compressor tool on the valve face and the other end over the spring cap, then squeezing the tool to compress the spring, then removing the split collets that hold the spring in place, removing the spring cap and spring, then eventually you have access to the stem seals.
The head has to be removed to accomplish all this.
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!!
When does it smoke? All of the time, or just when you start it? If it smokes all of the time, consider piston rings. If you have lots of smoke when first starting only, valve seals and possibly worn valve guides are the culprit.
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