2006-08-27 16:08:58 · 11 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
>Chevy 350 ?...you should assume you have both.<
2006-08-27 16:12:04 · answer #1 · answered by Druid 6 · 1⤊ 0⤋
Bad main seal is easy - you'll see the oil coming out the back of the engine. It gets everything back there covered.
Bad rod bearings will show up as a knock down low in the engine, and it may come and go. But lots of things can cause a knock. You'll probably need to take it to a trusted mechanic...
2006-08-27 23:13:57 · answer #2 · answered by InjunRAIV 6 · 0⤊ 0⤋
Bad con-rod bearings will give a definite sound, a metal on metal tapping sound. It gets louder and louder real quick, like days, not weeks.
Blown main seal on any engine will result in oil leaking out of the back of the pan.
2006-08-27 23:16:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
A bad rod bearing will usually make noise whereas a blown main seal will leak.
2006-08-27 23:14:12 · answer #4 · answered by Iknowthisone 7 · 0⤊ 0⤋
take a hammer and pound it against a metal bucket would get louder as u rev the motor that could possibly be your rod bearings if it is a lite ticking could be lifters.and which seal if it s rear main seal then the oil would be leaking out between the trans and engine would be all down the trans from when u driving the car.
2006-08-27 23:14:50 · answer #5 · answered by Marcus O 1 · 0⤊ 0⤋
If you find that you cannot rotate your rod in a full 360 without it binding, then you may need new rod bearings. I once wore out my rod bearings in a hammock with my ex-girlfriend. If you find that you have a white cloudy liquid around your mouth and on your face then you have probably recently blown a seal. A large seal probably.
2006-08-27 23:12:14 · answer #6 · answered by Anonymous · 0⤊ 0⤋
bad rod bearings will announce themselves with a light quick tapping noise that changes speed with the engine rpms. if you change them out quickly after you hear them, sometimes you dont have to replace the crank. if you are good, you can drop the oil pan and replace the rod bearings without pulling the motor out. a main seal will greet you with large amounts of oil leaking between the engine and transmission for a rear main seal.
2006-08-27 23:13:37 · answer #7 · answered by paintmetalwood 2 · 1⤊ 0⤋
If you are not planning on taking the motor apart. listen for a mild knock that increases with RPM's Also drops in oil pressure can indicate a bad bearing.
Rear Main seals generally leave a nice slick of oil under the car.
Both are common for SB Chevy's
2006-08-27 23:15:45 · answer #8 · answered by mobile_wireless_news 2 · 0⤊ 0⤋
a bad rod bearing will make a real bad knock in the lower end of the engine,,and a blown main rear seal..will leak a lot of oil out,,when it is running,,believe me these are things that you will notice,,i own a repair shop,,and these are 2 things that are easy to spot.
2006-08-27 23:13:05 · answer #9 · answered by dodge man 7 · 1⤊ 0⤋
if u have low oil pressure bad bearings. bad oil seal leaking oil badlyunder vehicle
2006-08-27 23:25:50 · answer #10 · answered by art t 1 · 0⤊ 0⤋