Is the 2007 5.4L an interference engine

MIDEERHUNTER

MEMBER
2007 FORD F-150
5.4L
V8
4WD
AUTOMATIC
130,000 MILES

Was told that the tensionors got loose and it's caused timing to be off. Is the 2007 5.4L still an "interference engine" and therefore has it caused valve damage in the short amount of time it was driven?

Sunday, June 23rd, 2019 AT 9:06 AM

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

Yes, both the 2 valves and the 3 valves are interference engines.

Caution: Timing chain procedures must be followed exactly or damage to valves and pistons will result.

Roy

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Sunday, June 23rd, 2019 AT 10:37 AM

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

Unfortunately, yes, the 5.4L and 4.6L Ford engines are interference engines. You can usually be a tooth or two off, but anything more than that will cause valve damage or damage to your vehicle's valvetrain. Please let us know what you find out.

Thanks,
Alex
2CarPros

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Sunday, June 23rd, 2019 AT 10:39 AM

BMDOUBLE

MECHANIC
1,139 POSTS

Usually bad tensioners will not cause timing to be off enough to cause damage, just noisy in start up. I’m assuming it’s running? If timing is off there will be associated trouble codes, if it’s off that is.

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Monday, June 24th, 2019 AT 6:47 PM

MIDEERHUNTER

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2 POSTS

It's my neighbors truck; yes it is running but he parked it as he was told that it was the tensioners. I am contemplating buying it off of him but didn't want to put $3,000.00 into it!

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Friday, June 28th, 2019 AT 6:30 AM

ASEMASTER6371