300 6 cyl. knock
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From: usa
300 6 cyl. knock
Alright just picked up this old ford truck. It runs great and doesnt smoke, it has plenty of power and gets great milage but it has a knock. Cant really put my finger on it but it is a standard OD truck and runs smooth till you get to about 3400 RPM at the top of the shift range. I have heard it on other trucks but not on all of them. it is a deep knock seems to be at the front of the block. I am a historically a chevy person but like ford trucks. Anyway what is this is it a rod or a wristpin or just the way things are. It was sugested to me that this is a bearing and that the thing would run that way forever. Anyway chevy's go when you get a bad bearing. Oh my oil presure is also good. Any help please. Thanks, Bob Also if anyone here is around kansas I have two good free or willing trade for something doors and a good front bumper rear step bumper and I think a good automatic tranny some chrome various stuff all from an 83 parts truck. I cut some metal out of the bed it is trash the fenders and dash are gone has a fairly good tan seat just an XL truck basic goint to the crusher soon
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From: Virginia
300 6 cyl. knock
Can you make it do it in the driveway? If so, pull the sparkplugs one at a time and see if you can pinpoint which cylinder it is. And yes, it may run a long time this way if you don't abuse it. I had a neighbor that ran a 300 six on 5 cylinders for at least a year. It had a hole in the side of the block where the rod came through on the missing cylinder and he just kept driving it.
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From: usa
300 6 cyl. knock
Heheehe thanks that is why I am here. I really dont know much about ford stuff. I didnt think about pulling the plugs and isolating it that way. It will do it in the driveway when I rev it up but not at idle. I think to listen to it it is coming from the front of the block around number 2 but I will check thanks for the help. 
all alone in the world
Joined: Feb 2002
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From: oklahoma
300 6 cyl. knock
sounds like a main bearing to me. see if the crank will move in and out quite a ways, may be the thrust main worn letting the crank move in and out. does it rattle pretty good when you first start it? does it get louder when the engine is warm ?
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300 6 cyl. knock
[updated:LAST EDITED ON 21-Aug-02 AT 09:12 PM (EST)]I had the same thing with the 6 in a old 79 150 4x4 its a rod knock and mine did it for 4 years didn't bother it one bit the guy that bought the truck from me uses it as a bush truck in a logging camp.
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From: usa
300 6 cyl. knock
Well just a little knock when I first start it up then it smoothes out. It does seem to get a little worst as I drive it. I am leaning tward the rod knock now. Thanks for all the help guys all my local friends are chevy people and as most of you probably know when you get a rod knock on a chevy you better park it 
. Man four years plus that way I was planning on putting a engine in it pretty soon. Cant hardle put it to pasture I just got done with almost 50 hours of body work on the thing. Thanks again
. Man four years plus that way I was planning on putting a engine in it pretty soon. Cant hardle put it to pasture I just got done with almost 50 hours of body work on the thing. Thanks again
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