What is this engine noise?
As many of you know I spend a few years resurrecting a 72 coupe for a friend. He drove it all summer last year and returned it to me in October for storage. When he dropped it off he wondered if it had a new exhaust leak.
Last summer we had the original right side exhaust manifold develop a huge crack very quickly and replaced that. In addition, the replacement radiator that was in the car failed (I knew it would) and was replaced by a DeWitts repro.
Those are the only two issues we've had now that it is back on the road - until now.
The past week we sealed the exhaust joints at the transmission which had small leaks and I double checked the manifold-to-downpipe joints which have no leaks.
I have held my hand over all the surfaces of the right side exhaust manifold while the engine is running and can feel zero leaks.
Just in case this noise was internal I've removed the valve covers a couple of times to inspect and even readjusted the hydraulic valves for cylinders 2/4/6/8, which really were fine and didn't need it.
Despite this there is still a "ticking" noise on the right side of the engine. Sticking my head all over it is either coming from the exhaust manifold in some way that I can't detect, or it is something internal to the head.
It sounds like it is near #6 cylinder. I can't feel any ticking at all when touching various parts of the motor as it is running.
FYI when the car is on our lift there is next to zero noise under the car. And, when standing on the left side of the car the ticking is not that noticeable.
If you wouldn't mind watching the video of the engine running and giving your thoughts I sure would appreciate it.
The owner wants to pick up the car in a week, but I'm only home for 2 more days and would like to figure this out.
I have a spare exhaust manifold available that we could install if needed, but I would like to get some opinions first.
Video: http://youtu.be/EHwtyLyUAKg
Thanks!
Patrick
Last summer we had the original right side exhaust manifold develop a huge crack very quickly and replaced that. In addition, the replacement radiator that was in the car failed (I knew it would) and was replaced by a DeWitts repro.
Those are the only two issues we've had now that it is back on the road - until now.
The past week we sealed the exhaust joints at the transmission which had small leaks and I double checked the manifold-to-downpipe joints which have no leaks.
I have held my hand over all the surfaces of the right side exhaust manifold while the engine is running and can feel zero leaks.
Just in case this noise was internal I've removed the valve covers a couple of times to inspect and even readjusted the hydraulic valves for cylinders 2/4/6/8, which really were fine and didn't need it.
Despite this there is still a "ticking" noise on the right side of the engine. Sticking my head all over it is either coming from the exhaust manifold in some way that I can't detect, or it is something internal to the head.
It sounds like it is near #6 cylinder. I can't feel any ticking at all when touching various parts of the motor as it is running.
FYI when the car is on our lift there is next to zero noise under the car. And, when standing on the left side of the car the ticking is not that noticeable.
If you wouldn't mind watching the video of the engine running and giving your thoughts I sure would appreciate it.
The owner wants to pick up the car in a week, but I'm only home for 2 more days and would like to figure this out.
I have a spare exhaust manifold available that we could install if needed, but I would like to get some opinions first.
Video: http://youtu.be/EHwtyLyUAKg
Thanks!
Patrick
(provided you are certain there is no external exhaust leak)
) to be very effective in pin-pointing a gremlin like you describe. I'm sure you've already come up with this idea. Does the "tick" change in frequency and in volume with RPM?
Comment