New guy getting a 6.9.
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New guy getting a 6.9.
hey yall im going to be getting a 84 f250 with a 6.9 soon i was told it has a knock (i havent heard it run yet) ive been reading alot these last couple days and noticed there are alot of reasons 6.9 will knock.
any advise on what to look for and what to listen for. hopfully i will get the truck to my house today and get it started so i can hear it and what its doing
Thanks
Cody
any advise on what to look for and what to listen for. hopfully i will get the truck to my house today and get it started so i can hear it and what its doing
Thanks
Cody
Post Fiend
Joined: Feb 2009
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From: Ottawa, Ontario
Fire it up, and first see where the knock comes from (top end of bottom).
If top end, theres a pretty good chance it could just be a stuck open injector dumping fuel into a cylinder causing pre-ignition, and a knock.
Have it running, and while running, crack open 1 injector line at a time, if you crack one open, and the knock goes away, you found your bad injector.
Otherwise, could be worn valve guides. Other than that, isn't much to knock in these, i've rarely see an IDI knock from the bottom end as well.
If top end, theres a pretty good chance it could just be a stuck open injector dumping fuel into a cylinder causing pre-ignition, and a knock.
Have it running, and while running, crack open 1 injector line at a time, if you crack one open, and the knock goes away, you found your bad injector.
Otherwise, could be worn valve guides. Other than that, isn't much to knock in these, i've rarely see an IDI knock from the bottom end as well.
Postmaster
Joined: Feb 2011
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if its an automatic, i've heard of the flex plate cracking and causing a knock. pull the tranny off and inspect the flex plate before you tear into the tranny itself
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Is the noise constant, or does in go away when the clutch is engaged/disengaged? Any idea which part of the transmission it's coming from? Any drivability issues you've noticed? You can still pull the inspection plate and see how the flywheel and clutch look, if need be.
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yes its consistant,no it does not go away with the clutch in or out,it sounds like the front like the flywheel. it drives and shifts good still but the knock gets louder when you get into higher rpms, i took the inspection plate off today and there are knicks on the teeth of the flywheel from where it looks like its hitting something small. heres a video of it.
MOV01956.mp4 video by 1967fordbronco - Photobucket
MOV01956.mp4 video by 1967fordbronco - Photobucket
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