So after buying a car for 250$ with a knock and driving home 30 miles soon after having the car not run anymore but still turning and ideling. Later on taking valve cover off and discovering bent push rod and a colapsed lifter. Then taking the head off replacing all the lifters and pushrods and the arms. the old lifters did not have any damage on the bottom so i figured the cam is fine. So first start up after fixing fired right up, but still was knocking. so i flushed the engine added antifreez and all the good stuff. still knocking. so i just drove it anyways. it drove still knoking and o yah i also got a messed up water pump i think cause the fan is all loose. the knoking is at is worse when the car is in park, and when the engine is hot. the knock seams to come from the upper back of the engine. maybe on the left. what should i do? what could the knock be? its not the bearings i already checked.
2007-05-13 16:12:02 · 5 answers · asked by ## 1 in Cars & Transportation ➔ Maintenance & Repairs
if the knock quits down when put in gear inspect the flywheel it may be cracked or toque convertor bolts may be loose
2007-05-13 16:18:22 · answer #1 · answered by tott1 5 · 1⤊ 0⤋
If you checked the bearings you would have also checked the connecting rods. The only thing left are the wrist pins in the pistons. But the car is 28 years old. thats about 196 man years. my advice is either finish rebuilding the engine so you know what you have or replace it with a used engine. I would look very carefully at how much money you are prepared to invest in a car of this age.
2007-05-14 00:01:01 · answer #2 · answered by Victor B 3 · 0⤊ 0⤋
You may have a piston slap, which you wouldn't be able to see by pulling the oil pan and inspecting the bearings. If the rings or bore are badly worn you could get this noise - try running a compression test.
It's also possible that you have a bad exhaust gasket, and the sound you're hearing is actually the explosive escape of gas from the manifold. On a related note, if the head gasket is going or the head bolts have become loose, you could have combustion gasses escaping!
2007-05-13 23:17:55 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Piston wrist pin?
Connecting rod?
Piston skirt slap?
Cam bushings?
That's a toughy without actualy hearing it.
2007-05-13 23:35:03 · answer #4 · answered by Mr. KnowItAll 7 · 1⤊ 0⤋
you gotta time the valves man, and you gotta be really accurate when you do that.
2007-05-13 23:20:34 · answer #5 · answered by MrZ 6 · 0⤊ 0⤋