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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis SPONSORED BY:

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  #1  
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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2006 F350 Harley Davidson, Atlas 40 from Ed 4" lift belstein shox
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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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2006 F350 Harley Davidson, Atlas 40 from Ed 4" lift belstein shox
Arp studs, sinister coolant filter, bullet proof egr cooler, 4" turbo back exhaust straight pipe, ccv reroute, sct ts/ tunes gearhead, 10 vein turbo, updated dummy plugs/standpipes, stc fitting, blue spring 2005 King Ranch,2004 Excursion
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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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2006 F350 Harley Davidson, Atlas 40 from Ed 4" lift belstein shox
Arp studs, sinister coolant filter, bullet proof egr cooler, 4" turbo back exhaust straight pipe, ccv reroute, sct ts/ tunes gearhead, 10 vein turbo, updated dummy plugs/standpipes, stc fitting, blue spring 2005 King Ranch,2004 Excursion
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Old 01-27-2014, 11:29 PM
 
 
 
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