So the knocking noise continues...
#1
So the knocking noise continues...
Well DF folks, here I sit stumped once again...
Thought it was a knocking noise from the oil pump suction tube... Pulled it and unplugged the coil, and the darned noise was still there! It seems to me like the crank was slightly touching the tube, but that isn't evidently causing the noise!
I've got the oil pan off, and am debating pulling the bearings and inspecting. All the lifters are getting oil, and the rocker bolts are tight. So I'm fairly sure it's gotta be a bearing somewhere. Someone mentioned that a bad throwout bearing can make the noise, but I'd have to pull the tranny to check it. So I'm looking for opinions. Any help is appreciated!
My plan is this: Pull the tranny and check the throwout bearing first, because if it's anything related to lifters or bearings in the engine I'm gonna have to pull the engine which'll require me to pull the tranny anyways...
Thought it was a knocking noise from the oil pump suction tube... Pulled it and unplugged the coil, and the darned noise was still there! It seems to me like the crank was slightly touching the tube, but that isn't evidently causing the noise!
I've got the oil pan off, and am debating pulling the bearings and inspecting. All the lifters are getting oil, and the rocker bolts are tight. So I'm fairly sure it's gotta be a bearing somewhere. Someone mentioned that a bad throwout bearing can make the noise, but I'd have to pull the tranny to check it. So I'm looking for opinions. Any help is appreciated!
My plan is this: Pull the tranny and check the throwout bearing first, because if it's anything related to lifters or bearings in the engine I'm gonna have to pull the engine which'll require me to pull the tranny anyways...
#2
#4
So I'm gonna put the new pickup tube in the truck and put the oil pan back on, and fill 'er up with oil and see how it sounds then. If it don't go away then, I will declare it time to pull the engine. Oh, once I get the pan back on I'll pull the serp belt just to make sure that way... I'll update later .
#6
Well DF folks, here I sit stumped once again...
Thought it was a knocking noise from the oil pump suction tube... Pulled it and unplugged the coil, and the darned noise was still there! It seems to me like the crank was slightly touching the tube, but that isn't evidently causing the noise!
I've got the oil pan off, and am debating pulling the bearings and inspecting. All the lifters are getting oil, and the rocker bolts are tight. So I'm fairly sure it's gotta be a bearing somewhere. Someone mentioned that a bad throwout bearing can make the noise, but I'd have to pull the tranny to check it. So I'm looking for opinions. Any help is appreciated!
My plan is this: Pull the tranny and check the throwout bearing first, because if it's anything related to lifters or bearings in the engine I'm gonna have to pull the engine which'll require me to pull the tranny anyways...
Thought it was a knocking noise from the oil pump suction tube... Pulled it and unplugged the coil, and the darned noise was still there! It seems to me like the crank was slightly touching the tube, but that isn't evidently causing the noise!
I've got the oil pan off, and am debating pulling the bearings and inspecting. All the lifters are getting oil, and the rocker bolts are tight. So I'm fairly sure it's gotta be a bearing somewhere. Someone mentioned that a bad throwout bearing can make the noise, but I'd have to pull the tranny to check it. So I'm looking for opinions. Any help is appreciated!
My plan is this: Pull the tranny and check the throwout bearing first, because if it's anything related to lifters or bearings in the engine I'm gonna have to pull the engine which'll require me to pull the tranny anyways...
Last edited by merc225hp; 03-28-2013 at 10:49 PM.
#7
I unplugged the coil so it wouldn't fire, then I turned it over. I had heavy grade oil in the system so I'm not worried about damage. I only turned it over once to ensure clearance.
I've verified that the rod bearings are going out, they have too much slop so that's why it was hitting the oil pump suction tube.
I'm gonna pull this engine, I'm getting another engine lined up so I can basically just drop it in. What I'm gonna do with this one I don't know yet.
I've verified that the rod bearings are going out, they have too much slop so that's why it was hitting the oil pump suction tube.
I'm gonna pull this engine, I'm getting another engine lined up so I can basically just drop it in. What I'm gonna do with this one I don't know yet.
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#8
a faulty crankshaft main or rod bearing usually makes a knocking sound that is very deep and pitch. Main bearing knock is usually a thumping noise most noticeable when engine is first started. Connecting rod bearings also cause a heavy knocking sound and engine oil pressure may also be low especially at idle.
When the cylinder with the faulty connecting rod bearings is disabled during a cylinder balance test, the knocking sound will diminish.
Camshaft bearings usually do not cause noise unless severely worn.
A piston pin with excess of clearance often makes a double click noise in the engine when its idling and it sometimes can get loud.
When performing a cylinder balance test, piston noise can increase when the faulty cylinders is disabled (the opposite reaction of a bad connecting rod bearing).
Lifters also make a distinct noise loud ticking sound. 1 way to tell the difference between that is to remember that the camshaft operates at half the speed of the crankshaft.
That's everything I could think of
When the cylinder with the faulty connecting rod bearings is disabled during a cylinder balance test, the knocking sound will diminish.
Camshaft bearings usually do not cause noise unless severely worn.
A piston pin with excess of clearance often makes a double click noise in the engine when its idling and it sometimes can get loud.
When performing a cylinder balance test, piston noise can increase when the faulty cylinders is disabled (the opposite reaction of a bad connecting rod bearing).
Lifters also make a distinct noise loud ticking sound. 1 way to tell the difference between that is to remember that the camshaft operates at half the speed of the crankshaft.
That's everything I could think of
#9