knock in 300

67RED · Post by **67RED** » Sun Jul 06, 2008 8:11 am

hey guys i got up yesterday started old red . it had a really bad knock toward the front of the engine on the bottom. at first it was just a knock now and then. then it became a steady knock.i shut it off now im trying to figure out if want to rebuild or replace. thought you guys could give me a little feedback. thanks may have to sell the 66 to fix the 67

ToughOldFord · Post by **ToughOldFord** » Sun Jul 06, 2008 10:45 am

Fuel pump is a good place to start. My 352 had a pretty serious knock, turned out to be a wore out fuel pump.

You can isolate it pretty easily using the wooden-pole-stethoscope trick.

averagef250 · Post by **averagef250** » Mon Jul 07, 2008 12:19 pm

A rod knock is not just loud, but can be felt through the whole truck and gets considerably harder with RPM.

A rod knock is cyclic with engine RPM. Anything else, valvetrain, fuel pump, etc will be 1/2 engine RPM and will not usually be felt through the trucks frame/body.

Post by **Ranchero50** » Mon Jul 07, 2008 2:15 pm

A 300 wouldn't be a 300 without a death knock... Usually not the end of the world, just make some plans to replace it down the road in a year or so.

Jamie

cathynkeith · Post by **cathynkeith** » Mon Jul 07, 2008 3:23 pm

I had great luck pulling the pan and just replaceing the mains, 300 is very tough. Han an 81 van, replaced bearing and distributor at 278k and went another 150k of very hard driving with 5 different delivery drivers, van got hit in the side in Arkansas almost went up there to pull the motor but too far and too much trouble.

67RED · Post by **67RED** » Fri Jul 25, 2008 8:43 pm

belive it or not guys it was the oil pump collapsed. and i put a new one on. and it stop knocking

RedneckTexan · Post by **RedneckTexan** » Sat Jul 26, 2008 1:44 pm

so oil is optional in a 300 six eh?

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