[realfine409]

Earlier while on the road, I had some turbo and egr valve work done. All the while, my purpose in taking it in was to find a "Chirping/screeching sound" that became more pronounced when applying a load or decelerating with the exhaust brake. As the replacement of both of those items did not result in the reduction or elimination of the noise, the shop said it must be in one of the exhaust flanges of the manifold. "If we take it off, it will never go back on so be prepared to buy a new manifold". 1) does anyone have the same noise and was successful in finding and fixing same. 2) is it true that these exhaust manifolds warp so much that they can't be reinstalled even if removed when cold?? :confused013: Any input would be appreciated.

 

[KhakiCummins]

I removed my manifold at about 86k miles for a head gasket replacement and had no issues in getting all of the bolts back in.

 

[dr.olds4554]

Earlier while on the road, I had some turbo and egr valve work done. All the while, my purpose in taking it in was to find a "Chirping/screeching sound" that became more pronounced when applying a load or decelerating with the exhaust brake. As the replacement of both of those items did not result in the reduction or elimination of the noise, the shop said it must be in one of the exhaust flanges of the manifold. "If we take it off, it will never go back on so be prepared to buy a new manifold". 1) does anyone have the same noise and was successful in finding and fixing same. 2) is it true that these exhaust manifolds warp so much that they can't be reinstalled even if removed when cold?? :confused013: Any input would be appreciated.

could just be a boost leak. Any manifold that is removed on a cold engine should go back on. I wouldn't buy that jazz.

 

[realfine409]

Thanx, that's what I thought as well, although I did have a hellofa time with an old shivvy manifold long ago, nothing a torch couldn't fix! I first thought about the boost side, tightened all of the clamps, no change. If it happens when power "ON" I would think it's between the turbo and inter-cooler, but it also happen when the EB is on then that would sound like over-pressure escaping from the exhaust manifold. 1 week in the shop and three pretty talented mechanics couldn't find it, and I didn't want to pay for a "process of elimination" exercise. I'm stumped!

 

[dr.olds4554]

Thanx, that's what I thought as well, although I did have a hellofa time with an old shivvy manifold long ago, nothing a torch couldn't fix! I first thought about the boost side, tightened all of the clamps, no change. If it happens when power "ON" I would think it's between the turbo and inter-cooler, but it also happen when the EB is on then that would sound like over-pressure escaping from the exhaust manifold. 1 week in the shop and three pretty talented mechanics couldn't find it, and I didn't want to pay for a "process of elimination" exercise. I'm stumped![/QUOTE


I hear that! That's a tough one. You ought to see some black after it leaks a while one would think. ?? If on the exhaust side anyway.

 

[Benyo]

I'm not saying its the same thing but after i deleated my truck and put a new boost elbow in my exhaust break got way louder and at high RPMS or heavy load it deffinatley sounds like a screeching more that a exhaust break but i know its fine no leaks and one the RPMS get down around 1900 it starts to sound like an EB again but deff check for leaks

 

[mattmanstroked]

If on the exhaust side I would also think that black soot is going to appear somewhere's if it has a leak.

 

[455kcummins]

When i bought my truck the original owner told me the turbo was failing, as it was whistling also. I removed the exhaust manifold and it was slightly warped. I ran it on a head resurfacing machine. .... cleaned up smooth. Runs awesome no more whistle. Straight forward job, order your new exhaust gasket from cummins directly and save a good $100