Bought it used, with almost 200k and it has a small ticking sound, steady. Sounds like a piston slap, however, on a longer trip yesterday (one of the coldest days of the year) under moderate acceleration it became noticeably worse (louder, almost more violent) and continued the rest of the trip home, where i parked it and have not moved it since.
In the past three days we've had single digit and negitive temperatures (in F)
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Re: 2000 4.3 small ticking sound
Well from what you dicribed it could be piston slop or rist pin slop, if it is i wouldent worry about it. it could also be a wore out rocker or lifter, with that many miles it could be most anything, but what bothers me the most is it got noisier when under acelaration witch could mean rod or maine. what about oil pressure? did you happend to chk. it as this was happening. you could try a heavyer oil like 10w40 with some additive like lucas or something along that line and see if it will quite down. your only out the price of a oil chg. if it were me i chg. oil like i said, and if it did not make any differance i would drive it until it blew, and then put a engine in it. but thats me. your cercomstances might be differant. start it up and listen, see if you can diterman if its comming from the top end or bottom end. heres a little trick you can use for listening to engine. get a long screw driver hold handel end to your ear and flat end to whatever you want to listen to, you will be surprised at howmuch you can hear and iscalate noises. hope i've been some help. OLD SCHOOL.
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Ticking noises from an engine, even an SBC, are never normal, Richard. You may be hearing lifter noise (one bad lifter) or excessive valve lash, or both... or you MAY be hearing a small exhaust leak from one manifold. If the pistons you put in aren't a really good match for the cylinders, you may be hearing "skirt slap", which will devolve into a really bad situation later down the line when the piston skirts break off. You may possibly be hearing bearing rap from either rod bearings or main bearings, if they were a little too loose, or timing chain slap if the tensioner isn't working right, or looseness in the distributor drive, or even spark snap between a plug cable and the block or head.
I imagine what you're hearing is piston slap. While that sounds bad, it's not. For a variety of reasons, manufacturers have been using pistons that are shorter and shorter in height. As they wear (we're talking a very small amount of wear here), the piston tends to rock in its bore. So you're hearing the skirts slap the cylinder walls. This is not harmful, just annoying. The sound goes away after the piston absorbs some heat, and thermally expands.
It sounds like a collapsed hydraulic valve lifter- a part of yoiur valve train in the upper engine. You need to have it checked at a shop you trust I don't know of any oil additives that can cure this, although someone here may give you some advice. Loose valve train noise is common on high-mileage engines, but if it is a collapsed lifter, I think you should have it checked. A loose timing chain will make a rhythmic slapping sound, but the ticking you describe sounds more like it's in your valve train. Have someone check it.
If you are sure it is piston slap then the only remedy is a rebore and slightly oversized pistons. If your running a lot of power or intend to then you should take the opportunity of getting internals forged. THe best source for this really is Roger Clarke Motorsport. Many forged engines will sound like a bag of nails when idling because of the type of piston used. Most normal pistons upper Small end bearing is slightly offset giving the piston a quiet movement . To increase the strength of the piston to take the extra load increased performance desires the piston small end is places pretty much top dead centre giving the engine a harsher note. Roger Clarke make a piston that overcomes this problem so you get a quiet engine and forged internals.
Not neccessarily. Have it diagnosed first. The ticking could be many different things. Bearings are one, lifters another or could be not internal engine, may be external. You also need to find out why its doing what it doing otherwise you will waste money fixing something and end up doing it again..
a clack clack or tick tick sound is the lifters. A deeper thumping is a rod knock or piston slap. You need to take it to a mechanic for an opinion. Sadly it sounds serious. You can use a rod or a hose to pin-piont the area of the noise.
Good news is - I don't think you need a new engine.
As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.
Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.
Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.
Some of these remedies require engine removal and strip down, others are a simpler fix.