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Harley wrist pin noise

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Damaged or worn main bearing noise is revealed by dull thuds or knocks which happen on every engine revolution.

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This noise is loudest when the engine is under heavy load. Excessive crankshaft end play is indicated by an intermittent rap or knock sharper than a worn main bearing. A damaged or worn connecting rod bearing will produce knock under all speeds. During the early stages of wear, connecting rod noise may be confused with piston slap or loose wrist pins.

Connecting rod knock noise increases in volume with engine speed and is at its loudest on deceleration. Engines designed with timing gears, or those equipped with a timing chain and sprockets, can produce different noise.

The most common noise is a high frequency, light-knocking sound. This sound will generally be the same in intensity whether the engine is idling, operating at high speeds, or under load. Loose or improperly seated camshaft timing gears are usually loudest when warm.

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They are speed sensitive only. They are not load sensitive. Cam gear noise will usually be evident at a warm idle in neutral and sounds much like a loose timing chain noise.

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Piston pin, piston, and connecting rod noise are hard to separate. A loose piston pin, for example, causes a sharp double knock usually heard when the engine is idling, or during sudden acceleration then deceleration of the engine. A piston pin that has been improperly fitted will emit a light ticking noise that is more noticeable with no load on the engine. Excessive piston-to-cylinder bore clearance will cause piston slap noise.

The noise is similar to a metallic knock, as if the piston were "slapping" the cylinder wall during its stroke. As with most engine noise, understanding the cause of the noise will help you imagine what the noise sounds like.

An indication of piston slap is a decrease in noise as the engine warms up. When the engine is cold, the piston to bore clearance is greater and piston slap will be louder. A loose or cracked flywheel will produce an irregular thud or click.

harley wrist pin noise

If a thud is heard, the flywheel may be loose or damaged. This type of thud is loudest on deceleration. Loose torque converter-to-flywheel or flywheel-to-crankshaft bolts will sound similar to bearing knock. This condition produces several raps during quick acceleration on a free running engine.

Depending on the idle smoothness, when the transaxle is in gear, the noise may or may not appear. Check the torque converter-to-flywheel and the flywheel-to-crankshaft bolts before attempting to investigate any bearing-related knock. I have a honda civic lx, i heard knocking sound everytime i begine to move backwards and there is a unusual sound when i shifting from 3rd gear to 2nd gear or when it was on engine breaking.

Service center cannot identify the problem! I have a chevy prizm and every time I start my care before its warmed up it makes a knocking sound when I shift from park. Does anyone have an idea what this could be?

I have a Chevy S10 with a manual-transmission. Any ideas? I have a 99 Chevrolet silverado.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. I have a Ford Escape 2. When you start the engine and you hear the sound, does it sound better after the vehicle is warmed up? A rod knock will only sound worse louder as the engine heats up. It will not go away as the engine gets warmer. If it does, it is probably something like an exhaust leak which closes itself as the engine manifolds get warm. The opposite could be true as well, where the noise comes on after it gets warmed up, but usually when it happens like this, it is pretty evident where an exhaust leak is at due to excessive soot buildup black marking at the leak on the exhaust manifold.

A rod knock will only get worse over time. If there is an oil pressure gauge, did the pressure go up when you first heard the noise, then become much lower than it should be? The cause of a rod knock is usually due to a spun rod bearing could also just be a worn out bearing over time, but much less common. If the bearing spins inside its home in the large end of the connecting rod, oil pressure will first go up, due to less flow of oil where there normally would be.

Then as the bearing quickly wears down, the oil flow will be much more due to there being a much larger clearance and an easy path for the oil to follow. The pressure going up at first may not always hold true, but you will see a large loss of oil pressure in a short period of time.

How much? It depends on the engine and the amount of damage. Usually, a spun bearing happens because either you were doing something stupid with an old engine revving an engine with k miles on it up to redline or you ran it dry of oil. They can spontaneously spin the bearing, but that is not very common. Rod knocks are very uncommon in engines where there is low mileage. Also, consider the maintenance history of the engine. If the oil was changed every 3k miles with a new filter, it's a lot less likely to happen.

Newer engines are designed to last a long time and usually do. While these are common items to consider with a rod knock, there is only one sure way to tell for sure and that is to tear the engine down. If you drive the engine long enough with a spun bearing, you can expect sooner or later to cause catastrophic damage to the engine with a rod being thrown through the side of the block, at which point you'll be in for much worse than a rebuild, but a replacement plus, there'll be a huge mess to clean up.

More than likely if you consider it is to be a rebuild, you should probably just look for a decent used motor to replace it.

The cost will be much cheaper in the long run. You'll need to know the service history of an engine prior to purchase, but it will probably outlast the vehicle at that point.College for the kid or a new engine? Diagnose Noises with a timing light? Valve train noises occur at half of crankshaft speed so even if your ear can't tell whether the noise is happening at rpm raps per minute or only rpm, your eyes can. Hook the timing light to any one cylinder and watch the flash illuminate the timing mark.

Stare at it for a while and see if the flash jives with the knock. If it does, then it is more likely to be rocker arms, pushrods, lifters, camshaft, cam bearings, timing chain and gears. If the noise seems twice as fast it is probably in the crank, mains, rods, rod bearings, wristpins and pistons.

Old Wives Tale number The engine has a problem so the head is replaced to correct the problem. Immediately afterward the engine starts knocking or ticking.

Loud Tick/Knock after Intake Replacement

The misdiagnosis is that the valve job gave the engine too much power making the aged bottom end fail. What really happened is that the mechanic burped the heads and timing cover off without draining the coolant from the engine first. The coolant spills into the bottom end of the engine. Even one oil change may not get all of the spilled glycol antifreeze out. SO how come millions of mechanics will lean over a fender and in 5 seconds, confidently spew, "yup, it's a rod knock", like they were looking at a big wart in a good light.

Now I have the advantage of having seen the guts of thousands of engines all laid out in front of me. Many of them soon after someone else has opined what they think is the source of the racket. Numero Uno by a wide margin is, " it's a "rod knock". It's a rod knock for every noise from fuel pump rattle to rocker arm tap.

My personal favorite was a screaming Chevette customer of mine who insisted he had a rod knock when in fact a bulge in his left front tire was hitting a shock absorber.

harley wrist pin noise

I'm sure that if a buffalo ate a burrito, Magnifico Mechanico would brand the resounding report a rod knock!!! When your engine is cold, the aluminum piston is small in comparison to it's surrounding iron cylinder. Because with heat, aluminum expands roughly 5 times as much as iron.

Therefore the rather hollow piston slapping noise will be loudest first thing in the morning. After the engine warms up, the aluminum piston expands more than it's iron cylinder, reducing the excessive clearance between the piston and cylinder wall.

Jay's Tech Tips #9: Wrist Pin & Piston Relationship/Installation of Pin Retention Clips

So, the test is this:. First thing in the morning, start the engine up and run it for 15 seconds while you listen carefully and memorize the sound and it's intensity. Shut it down quickly, pull the spark plugs and put two squirts of motor oil into each cylinder.Forums New posts Search forums.

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Engine Rod Knocking - Everything You Need to Know

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Thread starter hartdt Start date Jan 12, JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Jan 3, 24 0 0. Replaced the plastic intake was leaking at thermostat housing with dorman unit on my 99 GT 4. The replacement went well with no issues. Upon start-up the motor is making a loud tick or knock. Removed intake and scoped the intake runners and piston via the sparkplug holes and see no damage such as if something had fallen in during install.

Also compression test on each cylinder showed positive results. I am am confident I have the right PI stock replacement intake. The knock gets more prounounced as throttle is increased. Removed the serp belt and the knock is still there when the motor was run momentarily to see if the water pump or an accessory was the culprit.

Other than the knock the motor starts, runs smooth with no hesitation or miss. Can't tell where the noise is coming from top or bottom, left or right bank, etc. I have uninstalled and reinstalled the replacement intake twice with the same result of the knock Any ideas on what direction to go in now?

harley wrist pin noise

Thanks in advance for your help Mar 31, 30 0 0 Saugus, Ma. May put it back together in the morning with the original intake.If Your Engine is Broken - the cost of Repairs might be too high. You have places to be and time is running out. It sounds like someone keeps banging on your oil pan with a hammer, rhythmically rap-rap-rapping.

The noise comes from deep in the bowels of your motor. When you rev up the engine, the pitch and frequency changes. At one point, it sounds like the knocking noise nearly disappears. When you let off the gas, it continues and maybe even gets louder.

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This is what rod knock sounds like. These car engine sounds are also commonly known as engine knock, spark knock, and engine pinging. Enter your zip code below to get your FREE estimate and see how much your car is worth. Get paid the real cash value of your car in hours! Potentially you could spend more than what the car is worth.

Engine Rod Knocking - Everything You Need to Know

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In just 1 to 2 business days. Connecting the piston and crankshaft is a connecting rod. And your connecting rods is bolted on the bottom side around the crankshaft with smooth, thin metal bearings between the surfaces.

It lubricates the moving parts, allowing them to slide over each other frictionless. It also fills in the minute gap between the bearings and the crankshaft.

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It's simple and it takes less than 90 seconds No Haggle.User Name Remember Me? Shove the circlip in the coupling then push it in place with the socket. Borrowed a post from Springer Using a small pick or hook in a the groove on the piston, carefully hook the clip as shown below.

To install only requires a small flat blade screw driver. Place the clip at 6 and 12 O-clock. With the opening at 6, as shown. Insert the clip at one side and use your thumb to hold the other side. Press the clip as flat to the piston as you can, this makes it easier to work in.

Using the screw driver, work the clip in as shown in the following sequence of pictures. Clip after install, seated all the way around and clip opening at 6 O-clock Note: photo has been rotated to show gap location as mounted in the motor. Last edited by 8-Ball; at PM.

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harley wrist pin noise

Log in or Sign up. Atomic Industries www. Register now to get rid of these ads! The H. Characteristics of a wrist pin knock? Two days ago my motor developed a funny little noise. Its definately a knock, but doesn't act like a rod. It only shows up between about and rpm and only when the rpms are increasing or staying constant, never when I back out of it.

Until yesterday, it wouldn't make the noise unless the car was moving and the motor was under load, but now it will do it while the motor isn't under load. It sounds way to loud and deep to be valve clatter, but thats the next thing i'm going to check. The noise itself sounds kinda like loud spark knock, thats why I think it might be a wrist pin Had that on a car once. Turned out the shaft on the alternator was bent causing thE armature to contact the case.

So it could be anything. Steve RayJan 15, You may need a stethescope to find out where the noise is actually coming from!

To do this That'll give you a better idea if it's internal, external and will at least give you some idea what part is failing! Good luck Mark. Last night i used a real stethescope and listened all over the motor and didn't hear a thing at all. I listened to the heads, the valve covers, the oil pan, the water pump How severe is a wrist pin If it will stay together, I can get my fill of going fast and being loud on my bike So i guess its officially internal Hey Kenny, what could I learn from the plugs?

Wrist pin knocks fall halfway between lifters and lower end noises. When it get bad it will knock on the upstroke and down stroke sounding something like a lifter.

With the engine running and knocking, pull each plugwire one at a time.


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