Difficulty of Rod Bearings
Difficulty of Rod Bearings I have developed a knocking noise in my motor just after my header install. I have no metal shavings in the oil or anything I just changed that this morning and the filter is clean to. I have talked with 3 other people and they heard the noise and they say it is a rod bearing. I am wanting to beleive it is a lifter that is knocking but I don't think I will be that lucky. Is it just as easy as loosening the engine mounts and lifting the engine up enough to get the oil pan out then just unbolting the rod caps and pushing the new bearing in place then bolting the rod caps back together again. I figured if it actually destroyed a bearing there would be **** all over in my oil and drain plug all this stuff was clean. Can a lifter make a knocking sound if you rev it at idle and while the rpms are falling it starts the knock. It does it while driving to when you get in the 1800 rpms to about 2600 rpms the knocking starts and will continue through the shift until you get it below those rpms. Also it will not knock while going 80mph down the hwy at that same rpm. I put 15w-50 oil in it this morning and it didn't do **** to quite this thing down. Please Help
Originally Posted by *98Formula*
I have developed a knocking noise in my motor just after my header install. I have no metal shavings in the oil or anything I just changed that this morning and the filter is clean to. I have talked with 3 other people and they heard the noise and they say it is a rod bearing. I am wanting to beleive it is a lifter that is knocking but I don't think I will be that lucky. Is it just as easy as loosening the engine mounts and lifting the engine up enough to get the oil pan out then just unbolting the rod caps and pushing the new bearing in place then bolting the rod caps back together again. I figured if it actually destroyed a bearing there would be **** all over in my oil and drain plug all this stuff was clean. Can a lifter make a knocking sound if you rev it at idle and while the rpms are falling it starts the knock. It does it while driving to when you get in the 1800 rpms to about 2600 rpms the knocking starts and will continue through the shift until you get it below those rpms. Also it will not knock while going 80mph down the hwy at that same rpm. I put 15w-50 oil in it this morning and it didn't do **** to quite this thing down. Please Help
Oil pressure is solid 42 psi while cruising down the hwy at about 80mph it is right around 35 psi while idling. I am wondering if it is possible a lifter but I don't think they directly knock. And you have to pull the crank and have it reground everytime you replace the bearings? I figured if it was major damage then it would be raising a **** storm in there.
if its a spun bearing, it would be major damage to the crank. Id look elsewhere for the source of the knocking. Put a piece of masking tape or a sticky dot on the harmonic balancer and see if the knock is at full engine speed (rod or main bearing) or half engine speed (valvetrain related).
Can you clarify a little on the sticky dot on the balancer. I know when the knock is when you just rev the motor it is as the rpm's are falling back down that you get the knock. It is not at full engine speed. Basically if I have the motor idling and I bump the throttle it will rev normally no knock but as soon as the engine reaches top speed of that rev and starts to drop in rpms the knocking starts. I get a clicking/ticking sound while driving around normally I am thinking it may be a lifter that has collapsed or is damaged and is not holding its pressure when the rpm's start coming down which then causes the knock.
I know I mentioned this in your other post, so if you checked it, just ignore this. But I would check the AIR tube check valves. Most people that put on long tubes have problems with them. They are located on the AIR tube between the metal part and the rubber part. Just stick your ear near them and rev the motor a little. If it is them, it sounds like a marble bouncing around. Alot cheaper to fix too, I thick about $50 for a pair and then you need to make restrictors for them. Good Luck.
Ryan
Ryan
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By full engine speed, I dont mean high rpm, i mean that you get a knock once for every revolution of the crank (which you can see by following the dot sticker on the pulley). If you get one knock for every two revolutions of the pulley, that means its valvetrain related since the cam spins at half the speed the crank does.
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Verdad Gallardo Thanks Guitsboy Finally I got the problem fixed. Alot of you where wrong. It was not a rod bearing but believe it or not it was an exhuast leak at the header flange. I took the header off today and the pos aftermarket gasket and very lightly cleaned the header flange up with a dremel installed an oem gasket there and boom knocking is now gone and the car sounds incredible once again. I do appreciate everyone's insight on this though.
