Crank Pulley Bolt Size?

ReefBlueHatch · Mar 1, 2010

Anyone know what the size/thread is for the crank pulley bolts? My 5.0 is the only vehicle I have now, so I can't take out a bolt and then drive somewhere. I'm putting on a set of underdrives, so I need to find them in a grade 8 allan head.

Thanks for any help!

85_SS_302_Coupe · Mar 2, 2010

Actually, i think you'd be fine with 3 bolts in there. I ran with only 2 water pump pulley bolts for YEARS. But, you could always just take a wrench with you to the hardware store, pull off a bolt in the parking lot and go inside and match it up and then put it back on outside.

ReefBlueHatch · Mar 2, 2010

Yeah, I guess I'll just have to pull one off in the parking lot. Thought I'd check to see if anyone knew offhand.

4G-KDMP · Mar 2, 2010

Would you mind posting the length and thread pitch after you find out what they are for future reference?

84Ttop · Mar 2, 2010

your factory bolts should work w/ underdrive pulleys, what's the need to change them?

ReefBlueHatch · Mar 2, 2010

4G-KDMP said:
Would you mind posting the length and thread pitch after you find out what they are for future reference?

Yes I will. I was actually thinking about starting a thread on bolt size referance. If we have guys give a lot of good info on commonly needed bolts, it would be a great technical sticky.

ReefBlueHatch · Mar 2, 2010

84t-top said:
your factory bolts should work w/ underdrive pulleys, what's the need to change them?

With the crank pulley being so much smaller, the bolt holes are closer to the edge so you have to use allen bolts with a smaller head. I'm buying a used set without bolts.

91StangGT5.0 · Mar 2, 2010

Does anyone know what size allen head the pulley bolts use? I'm going in reverse....I'm going back to stock pulley since it's causing me problems.

7upstang91 · Mar 2, 2010

91StangGT5.0 said:
Does anyone know what size allen head the pulley bolts use? I'm going in reverse....I'm going back to stock pulley since it's causing me problems.

Trial and error my friend, should only take you a couple seconds.

4G-KDMP · Mar 2, 2010

91StangGT5.0 said:
Does anyone know what size allen head the pulley bolts use? I'm going in reverse....I'm going back to stock pulley since it's causing me problems.

If you're going to reinstall the stock pulley you can use regular headed bolts, no need for Allen head bolts.

Saleen0679 · Mar 3, 2010

3/8-16 x 1"

Mustang5L5 · Mar 3, 2010

ReefBlueHatch said:
Yes I will. I was actually thinking about starting a thread on bolt size referance.

I've been thinking of doing that for a long time. Stick a thread at the top of the tech forum listing all the misc bolt sizes for everything. Guys can add to it as we go.

I might still do it

4G-KDMP · Mar 3, 2010

Saleen0679 said:
3/8-16 x 1"

Thank You!!

srtthis · Mar 3, 2010

Saleen0679 said:
3/8-16 x 1"

Thanks... added to the list

ReefBlueHatch · Mar 3, 2010

Saleen0679 said:
3/8-16 x 1"

Thank you!

Crank Pulley Bolt Size?

ReefBlueHatch

Active Member

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

ReefBlueHatch

Active Member

4G-KDMP

84Ttop

They make new pistons every day, so why worry?

ReefBlueHatch

Active Member

ReefBlueHatch

Active Member

91StangGT5.0

Member

7upstang91

4G-KDMP

Saleen0679

Mustang5L5

That is…until I whipped out my Bissell

4G-KDMP

srtthis

the guy doing it does every local racers rear end

ReefBlueHatch

Active Member

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Crank Pulley Bolt Size?

Active Member

it sucks (I know) to be on the receiving end

Active Member

They make new pistons every day, so why worry?

Active Member

Active Member

Member

That is…until I whipped out my Bissell

the guy doing it does every local racers rear end

Active Member

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