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#8 cylinder knock

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Old 01-24-2014, 11:43 AM
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#8 cylinder knock

Hello
I have an 08 with the 6.4L. I have a knock that nobody can find. It has been doing it for about 15,000 miles. The engine has 200,000 on it now. It is the #8. Engine runs like a top, nice and smooth. All drivers side injectors are new, heads have been off, new lifters and rockers installed. I have no codes. The #8 does have low contribution but not low enough to toss a code. I am getting very tires of the noise and I believe it is getting worse, but it does sometimes almost go away. Very frustrated. Any ideas??
Thanks
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Old 01-24-2014, 09:42 PM
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Does the knock speed up with rpms?
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Old 01-25-2014, 07:13 AM
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Yes, gets quieter with rpm though
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Old 01-25-2014, 08:31 PM
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Quote:
Originally Posted by captain_trucks View Post
Yes, gets quieter with rpm though
When let off going down the road at about 55 or 60 can you here it ?
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Old 01-25-2014, 09:54 PM
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Have you not checked the cam or crank shaft bearings?
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Old 01-26-2014, 12:50 PM
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Quote:
Originally Posted by 9228.bobcat View Post
When let off going down the road at about 55 or 60 can you here it ?
No, it sounds normal when u let off?

Cam bearings are good. Noise is defiantly top end.
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Old 01-26-2014, 01:57 PM
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And you checked all your injectors? Maybe a rocker arm.
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Old 01-27-2014, 07:28 AM
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New injectors and new rockers and new lifters as stated in the beggining. The noise can be heard with a stethascope right at number 8 cylinder at the exhaust manifold.
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Old 01-27-2014, 11:29 PM
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Yea I seen that but didnt know how long ago it was replaced, mileage wise. Them rockers are kind of weak.
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