Alarming noise
Thread Starter
Intermediate
Joined: Feb 2008
Posts: 25
Likes: 0
From: Jolimetz (France)
Alarming noise
hello,
Yesterday when i start my vette i've heard this kind of smacking, knocking, from the engine. It seems to come from the right valve cover
http://fr.youtube.com/watch?v=aJxxQB1zWvc
The rockers appears to be moving the same amounts and at idle, I get 600 rpm and 38psi oil pressure on the gauge (350ci 5,7l)
I don't like this!!!!
any idea??
thanks to let me know and what i'm going to do .
Yesterday when i start my vette i've heard this kind of smacking, knocking, from the engine. It seems to come from the right valve cover
http://fr.youtube.com/watch?v=aJxxQB1zWvc
The rockers appears to be moving the same amounts and at idle, I get 600 rpm and 38psi oil pressure on the gauge (350ci 5,7l)
I don't like this!!!!
any idea??
thanks to let me know and what i'm going to do .
Melting Slicks
Joined: Aug 2006
Posts: 3,429
Likes: 20
From: Kingston Ontario
WOW....sounds bad. Loose rocker is the best case scenario. Bent push rod, cam lobe gone....it actually sounds like it's more than one rocker making noise.I wouldn't run it at all until you take it apart and find out what it is.
Racer
Joined: Apr 2007
Posts: 361
Likes: 0
From: Sacramento (Citrus Heights) California
ouch, that sounds painful. Almost like a thrown rod or a bad main bearing. If it sounds like it's coming from the top end, check to see that you haven't dropped a valve face or a valve seat (rare but it happens) and check your valve lash with the engine off.
Racer
Joined: Jul 2007
Posts: 444
Likes: 0
From: Roselle IL
You should also get your head under the car, down by the oil pan and listen. Is the knock louder or quieter down there.
Certainly sounds like a rod knock or piston slap.
Thread Starter
Intermediate
Joined: Feb 2008
Posts: 25
Likes: 0
From: Jolimetz (France)
Hi,
the oil pressure is the same as before.
all the rockers are squirting oil but not so much and it's not the rain when i speed up, only some drops of oil!!
Under the car this knacking is quieter..i will say "hushed-up"
the oil pressure is the same as before.
all the rockers are squirting oil but not so much and it's not the rain when i speed up, only some drops of oil!!
Under the car this knacking is quieter..i will say "hushed-up"
Burning Brakes
Joined: May 2007
Posts: 945
Likes: 0
From: Ventura California
Do you have a hydraulic cam? First thing I would do would be to check the total lift from the cam to see if you are losing a cam lobe. You can do the "bubba" engine stethoscope and use a length of wood touched to various parts of the running engine with your ear to the other end and listen for the noise. It will help you localize the source. Just don't get it close to moving parts and put a wood dowel through your ear! On second thought, go to the auto parts store and purchase a proper stethoscope
.
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