Fasteners

[ukgtguy]

I'm finally going to be starting a bunch of work to mod my GT (brakes, suspension etc) and I was thinking of stocking up on some nuts and bolts etc to replace any fasteners which are past their prime as I reinstall stuff.

What I need to know is on the SN95b (2004) are the fasteners all metric these days or still UNF (or a mix). Also - I expect to come across nylon locking nuts which will really need replacing; but are there any one-shot 'prevailing torque' type fasteners which have to be replaced once they're removed ?

I noticed in the factory service manual for example that if you remove the bolts securing the lower control arm to the rear axle it says (as it does in a lot of other cases) to 'discard the bolt'.


Thanks.

 

[LaserRed01GT]

Involving the brakes, the only TTY (torque to yield) bolts that I know of are the anchor plate bolts. Once you remove them you should throw them away and replace them with new bolts. The caliper bolts can be re-used.

Anchor bolts are 85 lb-ft.
Caliper bolts are 23 lb-ft.

There are quite a few TTY bolts used in the suspension/chassis. The LCA's are one of them. Which specific suspension components were you thinking of replacing?

 

[ukgtguy]

Hi. Thanks for the feedback.

I'm only swapping out the springs and front brakes initially - but I was going to drop the control arms (or axle) to do the spring install without compressors.

I'll assume any bolts that the Ford service manual says to discard are TTY then.

Is it best to replace the TTY fasteners with new TTY fasteners, or are new bolts with nyloks sufficient ? (I don't want to take any chances here !)

I'm guessing from the stamps on the fasteners I checked so far they're actually metric rather than UNF ??

Cheers.

 

[LaserRed01GT]

Yes, it will be fine to replace the TTY bolts with a regular Grade 5 bolt and Nylock nut.

There should be some numbers stamped on the bolt head, if so they are metric.

 

[bdcardinal]

i would only use Grade 8.8 or 10.9 on a suspension. any bolt that doesnt have a nylok, or cotter pin should have safety wire on it.

 

[twogts4us]

Involving the brakes, the only TTY (torque to yield) bolts that I know of are the anchor plate bolts. Once you remove them you should throw them away and replace them with new bolts. The caliper bolts can be re-used.

Anchor bolts are 85 lb-ft.
Caliper bolts are 23 lb-ft.

There are quite a few TTY bolts used in the suspension/chassis. The LCA's are one of them. Which specific suspension components were you thinking of replacing?

You sure about that (LCA bolts being TTY)? I know a lot of instructions tell you to buy new ones, but many have told me they've reused em. I myself have reused em too. The only TTYs I was certain of were the head bolts...probably some other engine bolts too.

 

[bdcardinal]

they are TTY if the torque sequense involves turning them an additional amount of degrees after reaching a lb-ft or Nm spec. true fasteners should be replaced, however finding the correct ones is usually a challenge.

 

[LaserRed01GT]

You sure about that (LCA bolts being TTY)? I know a lot of instructions tell you to buy new ones, but many have told me they've reused em. I myself have reused em too. The only TTYs I was certain of were the head bolts...probably some other engine bolts too.

Positive.

A Grade 8 bolt for the LCA's would be WAY overkill. A Grade 8 bolt for the LCA's would have over a 100,00 PSI load strength. Even with a 1000 HP motor, you would never even come remotely close to breaking a Grade 5 bolt. Even a Grade 5 is a little overkill, but it's good insurance. There is no such thing as a Grade 8.8 or 10.9 bolt. There is however a 8.8 and 10.9 class rating. Those are a totally different median steel bolt. Median steel bolts are much heavier and softer than a carbon steel Grade 5 or 8 bolt, and it wouldn't be a good idea to use them for suspension bolts.

 

[bdcardinal]

i was mearly pointing out that metric bolts have 8.8 and 10.9 ratings and do not use the dashes like standard old style bolts use.

 

[LaserRed01GT]

i was mearly pointing out that metric bolts have 8.8 and 10.9 ratings and do not use the dashes like standard old style bolts use.

I understand you were just trying to help, but you were recommending a bolt that is softer and has a significantly less load strength than even a Grade 5 bolt. I was just clarifying for our friend across the pond.

 

[bdcardinal]

ahh just realised he was in the country that ran my ancestors out of ireland. (no offense, my family were extremely active in the IRA).

i know that Sean Hyland used to list all of the bolts on his webpage. he is expensive, but it might be worth shooting an email to them to see if he still has them or can give you Ford part numbers. usually if you can go to a Ford dealer with part numbers they can get it even in a different country. i know BMW dealers can get German model specific parts. i havent tried scoring some Australian heads for the mod motor, but its worth a try.