Interference Engine or Not?
#1
Interference Engine or Not?
I have a 2003 F-150 with the 5.4 liter V-8. I am having trouble getting a straight answer on whether or not this engine is an interference engine. Can any of you tell me? thx
#3
Senior Member
The simplest explanation of what an interference engine is that if things aren't lined up properly, the valves impact the pistons.
I was just poking around a little bit, and from what I Can find, it is an interference engine.
I was just poking around a little bit, and from what I Can find, it is an interference engine.
#7
Senior almost
What I can find is that 2003 5.4 if the timing chain brakes the pistons will not impact the valves there is clearance... Least what I can find.....
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#8
Senior Member
Minus a Ford tech piping in, there's no way to know without breaking a timing chain and trying it out.
#9
< Ford tech. The modular motors are certainly interference engines. I knew that already but I just searched the workshop manual trying to find proof because some people want that and all I found was this warning : CAUTION: Unless otherwise instructed, do not rotate either the crankshaft or the camshafts when the timing chains are removed and the cylinder heads are installed. Severe piston and valve damage will occur. Which is stated several times in the timing section of the shop manual for the 4.6 and 5.4.
Edit: I also looked and couldn't find anywhere you are "otherwise instructed" either haha, I'm not sure why they put that in there.
Edit: I also looked and couldn't find anywhere you are "otherwise instructed" either haha, I'm not sure why they put that in there.
Last edited by Austin97; 06-18-2011 at 06:55 PM.