k well i got my 1990 240sx back from my nissan dealer today from gettin the oil pump replaced and the timing redone. the mechanics said that the engine was making a rather bad tapping noise and it was, and by the time i got the car home, 10 minits later, the engine was still tapping, no louder, no quieter. just the same. so what would cause the tapping? it's coming from the valvetrain and won't go away. oil supply is sufficient. stp was thrown in and the tapping didn't stop. what could this be?
any help would be greatly appreciated.
noisy KA24E
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apex_240sx
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bruinbear714
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Yes that noise is coming from your valvetrain. Most likely its your rockers going bad, or the two arms that hold the rockers in place.
If you replaced your timing chain because your guide broke off, the plastic could have been eaten up by the crank, melted into the oil, and ended up in your rocker arms, which can cause the tappings. If it makes a LOUD knock then most likely you will have to replace the arms and rockers. If it is minor tapping then just replace some rockers..
Try this - get a bottle of ATF and dump it into your engine oil, run your car for a day, and change out the oil. See if that helps.
If you replaced your timing chain because your guide broke off, the plastic could have been eaten up by the crank, melted into the oil, and ended up in your rocker arms, which can cause the tappings. If it makes a LOUD knock then most likely you will have to replace the arms and rockers. If it is minor tapping then just replace some rockers..
Try this - get a bottle of ATF and dump it into your engine oil, run your car for a day, and change out the oil. See if that helps.
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singlecamhonduhkilla
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mines doing the same thing..
it just started doing that.. since last sunday.. after i was racing a neon.. i did a real bad launch.. and needless to say i think i over revved a lil.. like maybe 6.4rpms.. and i have that tapping noise too.. but its like when i rev it or take off.. it taps.. it sounds like when ur on a pedal bike.. and u put a baseball card on the spokes.. tap tap tap tap tap tap... so should i take it to a mechanic or should i try that twf or whatever u just said... whats it called again.. and when can i buy it at.. lemme know please..joe:help
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bruinbear714
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pour a bottle of automatic transmission fluid into your engine oil and run it for a day to see if that helps with the noise. Change out your oil after a day though.
If it doesn't fix the tapping noise, then you will need to pull off the valve cover and feel each rocker to see which one is giving slack.
If it doesn't fix the tapping noise, then you will need to pull off the valve cover and feel each rocker to see which one is giving slack.
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singlecamhonduhkilla
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- Car: learning all i can about this car.. some street racing.. etc..
must be a trick of the trade??
im sorry ive never heard of that... putting automatic transmission fluid into the oil.. can u please explain to me why that would help... im retarded so i really dont know.. and im not trying to be funny.. i really dont know.. :help
The automatic transmission fluid acts as a corrosive agent in an engine, while still being a decent lubricant (stopping any serious harm to mechanical parts).
Why is this good you ask? Because it gets into tiny little places where oil someimes can't. In this case, the tiny oiling hole in the lifters. Hydraulic lifters work by pumping oil in and out, constantly keeping the valve height at the correct point. But if that oiling hole gets plugged with crap, the lifters dry up and make that tapping noise. By injesting the ATF, it eats through the junk stuck in the oiling hole and allows oil to once again flow into the lifter, lubricate it and therefore stop the ticking.
Just be warned, ATF can be very dangerous to put in an engine. Make sure you know what you're doing before you go ahead with this.
Why is this good you ask? Because it gets into tiny little places where oil someimes can't. In this case, the tiny oiling hole in the lifters. Hydraulic lifters work by pumping oil in and out, constantly keeping the valve height at the correct point. But if that oiling hole gets plugged with crap, the lifters dry up and make that tapping noise. By injesting the ATF, it eats through the junk stuck in the oiling hole and allows oil to once again flow into the lifter, lubricate it and therefore stop the ticking.
Just be warned, ATF can be very dangerous to put in an engine. Make sure you know what you're doing before you go ahead with this.
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Turbo_Nismo_EC
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I just replaced my lifters in my KA24E. It made that noise for a long time until I could get it rebuilt. However, the guy up at the Nissan dealership who diagnosed the problem told me it wasn't serious and that it will just annoy me until I could get them replaced with new ones. WRONG! When I pulled that lifter off it was tore up. It had a big chip taken out of it and it destroyed the top of the valve, from smashing into the top of it forcing it to open. I mean don't get me wrong. I didn't drive it for years with it tapping like that either. It would come and go over time, usually it would start right as I was about to change my oil, and then stop until it was time to change it again. This is a pretty serious thing. From the experience I've had I would change them ASAP.