I just had my k2700 overhauled because it had a bearing knock, but there is still a tapping sound that doesnt go away. it quitens down when i travel above 60, but is back when i slow down
If you just had this overhauled from a shop and this is happening you have warranty go back to the people that rebuilt it and have them honour their warranty. if you built it and you did the entire engine and not just the bearing, then check the oil pressure you may have bad lifters or cam or cam bearings causing not enough pressure.
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Pinging or combustion-related knock could be caused by a partially clogged fuel injector, low fuel pressure at the injector, or hot carbon deposits in the cylinder triggering premature ignition. Mechanical knock could be a worn or broken rod bearing, or (more rarely) a worn crank bearing. A worn or sticky valve tappet or lifter often makes a tapping sound, particularly if the oil pressure is low.
If your Check Engine light is on, get a readout of the error code; it may help you narrow down the cause. An experienced mechanic may be able to tell you more just by listening to the sound,
Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.
The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.
hi,the first thing to do is an engine flush,then refill with10/40 or 20/50 oil, semi sythetic,not forgeting to change the filter.this particular engine is quite loud but the noise should die down after about 15/20 secs if its tappy.i would also reccomend adding wynns or another oil additive to help the self adjusting tappets quiten down.An oil blockage would show up as a loud knock (big end rumble)and the oil warning light would show on the dash.
after you do the oil change rev the engine to 3000 for 30 secs.this will help to get the tappets right.
If it is a 'squealing' noise it's probably the alternator/power steering drive belt. Before you turn on the engine in the morning, lightlt smear or spray some oil on the inside of the drive belt to lubricate it. If the squealing stops/disappears, then that's the fault ..
That squealing noise can be caused by an incorrectly tensioned belt, or a worn belt. Replacement is the only option.
The other frightening sounds can best be described as 'rattles' or 'tapping'. When a car stands overnight all the oil drains back into the sump (oil/pan).
There are two things (usually) that can be cause the rattle/tap:
1. Because the oil hasn't been pumped around the system, at start up worn big end bearings can rattle and tap on the crankshaft until the oil 'fills the gaps'. The tapping/rattling goes away as the engine warms and oil is pumped around the lubricating system.
A 'bottom end tapping' is a symptom of worn big ends (they are bearings at the bottom of the piston and fit around the crankshaft).
2. A rattle/tapping from the top of the engine can either be a worn camshaft or 'lazy tappets'. Again, when the engine warms and oil gets to the camshaft and tappets (also called 'hydraulic lifters) the noise will disappear.
If your car has this rattling/tapping noise - identify whether it is coming from just under the rocker box (ie the camshaft/tappets..) or the bottom end of the engine (big end bearings).
If the noise is coming from the top of the engine, try an oil change with a can of thick 'additive' included. A lazy tappet (lifter) isn't too much to worry about. A worn camshaft will affect the performance of the engine, though continue to do its job. An oil change with an additive included may help in quitening things down.
A bottom end tap/rattle (or 'knock') - the sooner that is sorted out the better.
Sounds like you are due for an engine overhaul, you have a connecting rod knocking if it varies with engine speed (unloaded) or you have a main bearing knocking if it varies with load and rpm. Let me know if the knock is down low or closer to the head..I doubt it valves...you have an engine that needs an overhaul.
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