Tensioner arm bolt

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brandon4v

New Member

Jan 14, 2026

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California

Jan 14, 2026

#1

• Jan 14, 2026

• #1

I have an 03 mach 1 and I'm in the process of replacing my belt tensioner and we unfortunately snapped the bolt in the process ive been calling ford dealerships and looking online and I can't find anything on what bolt I need all the dealerships part services can find is the bolt for the cobras. Please help me!

 

KRUISR

10 Year Member

Apr 16, 2015

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Jan 14, 2026

#2

• Jan 14, 2026

• #2

Try a local wrecking yard. Either find a Mustang or an F150 of similar year as it would surprise me if the tensioner hardware was different between your car and them. The tensioner may be different, but the mount bolt from 4.6 to 4.6 is likely the same in all cases.

Just a thought.

 

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brandon4v

New Member

Jan 14, 2026

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California

Jan 14, 2026

#3

• Jan 14, 2026

• #3

KRUISR said:

Try a local wrecking yard. Either find a Mustang or an F150 of similar year as it would surprise me if the tensioner hardware was different between your car and them. The tensioner may be different, but the mount bolt from 4.6 to 4.6 is likely the same in all cases.

Just a thought.

Click to expand...

Yeah just the only issue is that it's a tty bolt so definitely don't want to reuse that I made that mistake doing that in a pinch for a temporary thing and almost ruined my whole day.

 

KRUISR

10 Year Member

Apr 16, 2015

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#4

• Jan 14, 2026

• #4

Interesting, I never thought that would be a tty bolt. Anyway then, just find out what length and thread it is and pick up 10.9 grade bolt and put it together.

When the tensioner is installed, there shouldn't be any special or unusual loads on it. A normal 10.9 bolt will be plenty strong.

 

RaggedGT

Been here over a DECADE and still no CT

Mod Dude

Jul 20, 2014

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Taylorsville ky

Jan 14, 2026

#5

• Jan 14, 2026

• #5

Do you have the entire broken bolt? Take it to fastenal

 

squeak93

15 Year Member

Jun 2, 2005

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Joplin, Missouri

Feb 2, 2026

#6

• Feb 2, 2026

• #6

You snapped the bolt on the new tensioner or the one you're trying to remove? FWIW, I've mounted/unmounted tensioners a billion times with the same bolts, never an issue (well aside from prochargers belt force snapping entire tensioners off haha).