The answer in a nutshell is... NO !! Knocking indicates excessive clearances between the rod bearing & crankshaft journals. These two areas will develope an out-of-round condition, wich MUST be machined back to acceptable tolerances. Any competant auto machine shop can perform this for you, & fit new bearings that will last a long time. Just putting new bearings will quite the engine for a short time, but will fail quickly, putting you right back in the same situation in short order! The time and money spent on just new bearings will have been wasted.
It all depends on what KIND of knocking sound.Some people call it a knocking sound when the engine pings from pre-ignition. If that's what you have, check the knock sensor.A classic knocking sound is typically either worn bearings or piston slap.Piston slap is when there the skirt of the piston is a little small and it "pops" at the bottom of the stroke. Typically that sound goes away once the engine warms up. The small block 350 is notorious for a little piston slap and as long as it goes away once the engine is warmed up piston slap is considered to be in the nuisance category of engine sounds.If it's worn bearings you'll also see some kind of indication of low oil pressure. If THAT'S going on, the engine is "done". You can try a heavier weight oil but if it's knocking constantly that probably won't do much good.Thank You for that Answer about the Bearings and Crankshaft
Hydraulic lifters will rattle a little when the engine first starts if the oil has leaked out. Typically that doesn't take too long to go away. Often the knocking noise when an engine first starts is because of worn rod bearings or "piston slap". If there is too much gap in the rod bearings you'll have some knocking when you first start that will last until oil has filled the oil lines. Piston slap takes a little longer to go away, and that's because it's a noise that's caused when the skirt of the piston pops from one Sid of the cylinder to the other. A worn piston will leave too much clearance at the bottom of the cylinder, allowing the piston to slap back and forth when it's running. As the engine warms, the piston expands and usually the noise either goes away or diminishes considerably. It's often a guessing game to figure out which part is worn and causing the problem.
It is possible that the bearings are going bad on the water pump but you are going to have to listen to where the noise is coming from, whether it is inside the engine ( rod knock or oil pressure issues ) or outside (pump bearings or pulley issues).I lean toward internal wear or damage to the engine since the noise goes away when it warms up which indicates that when good oil circulation is present the problem goes away, bad bearings in a water pump will always make noise until they are repaired.
A knocking engine can mean any of a number of things, main bearings, rod bearings, wrist pinsw or piston slap. If it's just piston slap, you probably have a lot of miles left in the engine. Anything else means trouble. Does it have an oil pressure switch or an oil pressure gauge? If you have a gauge watch the oil pressure. If it's up at an idle you probably have piston slap or wrist pins. If the oil pressure drops way down it's probably rods or mains. If the knocking goes away after a few seconds it's probably piston slap.
No. It is not normal at all. Go to a mechanic and get their opinion. Engine knocks usually signify severe damage, and driving with it will cause even more damage. Always check your oil as well. Make sure it is clean and topped off. knocking can also sometimes mean you have the wrong octane but most of the time it means your tie rods or connecting rods are worn A knock at idle however can only be bearings, it would be beneficial to get things looked at right away,
there are a few reasons for engines knocking......... - bad type of fuel - higher gear ratio at slower speeds if your engine knocks when you start it up then you have probably got a bad or dirty fuel in your car... change the filters or just get away with using it and change your petrol station if the engine knocking happens during driving then its because you are putting more gas on at lower speeds and higher gear ratios...you just need to lower your gear. say change from gear 3 to gear 2 and try increasing the gas gradually and slowly and the knocking should go away....
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