Question about 2007 Ford F-150 Harley Davidson
THE ENGINE KNOCKS LOUD WHEN FIRST STARTED IN THE MORNINGS AND AFTER IT SITS FOR A FEW HOURS BUT IT QUITS
AFTER A COUPLE OF SECONDS AND RUNS FINE GOOD OIL PRESURE NEED HELP COULD IT BE A ROD BEARING OR A MAIN BEARING ????????????????
Hi Bill 609!
Definitely sound like a rod insert to me. With my practiced ear, I cna tell the difference between a main bearing knock (deeper sound, more of a thudding noise), rod bearing knock (not so deep, gets louder as the engine revs, kind of a rat-tat-tat-tapping noise), and a wrist-pin knock (not quite as loud or deep and gets louder with decelerating RPM).
You can tell which cylinder the knock is on by removing the spark wires to each cylinder one at a time while the engine is still cold enough to knock. (Don't get shocked!)... when you hit the right one, the knock will noticeably quieten or possibly quit altogether!
The 300 Six is a tough old motor and I have seen them survive for years with rod knocks... Just allow the engine ample warm-up time before driving, drive on the conservative side, and keep an eye on oil level and pressure.
An oil and filter change to a higher viscosity oil with a can of STP Oil Treatment (Or something similar) is a good band-aid fix for now, I would recommend Castrol GTX 20/50w... in my opinion, Castrol is the best brand out there, I use it religiously - - - I have a customer with a Chevy Suburban who has followed my advice and adhered to good maintenance discipline that has racked up over 300,000 miles on the original small block and no consumption or engine issues, and is still running strong!
Bill, the temporary fix will work for a while, hopefully a long while --- BUT when it reaches the point that the knock doesn't go away, it is time to park it until the real repair can be done --- otherwise you risk throwing a rod and destroying your engine beyond repair!!!
Please don't hesitate to post a comment or ask if you have further questions. I hope this information answers your question and concerns and wish you well with the Ford. *** And remember to rate my assistance... Your rating is my only compensation for helping you in the free blog!!!***
Posted on Jun 27, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Sep 28, 2016 | 1986 Isuzu Pickup
Mar 02, 2014 | 1996 Ford Econoline
Jun 17, 2013 | Ford Expedition EL Cars & Trucks
Dec 25, 2012 | 2004 Jeep Grand Cherokee
Dec 24, 2012 | 2005 Ford Explorer
Aug 04, 2010 | 2001 Ford F150 Styleside SuperCrew
Nov 05, 2009 | 1997 Subaru Legacy
Jul 27, 2009 | 2001 Ford Focus
Jul 09, 2009 | 1986 Ford F150 SuperCab
Aug 13, 2008 | 1986 Ford F150 SuperCab
553 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: