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4.0 Fastener Sizes

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Sailboy42
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Vehicle Year: 1990
Vehicle Make: Jeep
Vehicle Model: YJ

4.0 Fastener Sizes

Post by Sailboy42 » February 5th, 2021, 10:11 am

Hi all, I am trying to compile a complete kit of the Jeep 4.0 bolts and studs. I've created this spreadsheet to the best of my ability. Please feel free to comment so it can stay accurate. I'm trying to making it as universal as possible, but if I can get confirmed info for certain years, I will be happy to add it.

https://docs.google.com/spreadsheets/d/ ... sp=sharing

Randy Bobandi
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Joined: December 22nd, 2020, 8:50 am

Re: 4.0 Fastener Sizes

Post by Randy Bobandi » February 7th, 2021, 10:53 pm

Intake/Exhaust Manifold are 3/8 Studs not 5/16. 3/8-16 block side, 3/8-24 flange side.

Sailboy42
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Re: 4.0 Fastener Sizes

Post by Sailboy42 » February 8th, 2021, 8:28 am

Gotcha, I took the 5/16 value off a parts diagram. But for all the studs, they make the value really weird to read.

Sailboy42
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Re: 4.0 Fastener Sizes

Post by Sailboy42 » February 15th, 2021, 5:17 am

As I've looked at the fasteners, I found some unthreaded portion below the thread. I've found that they are always no more extended than .15 and slightly thinner than the rest. Is this a needed feature, are when I buy new bolts, I can ignore it.

Randy Bobandi
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Joined: December 22nd, 2020, 8:50 am

Re: 4.0 Fastener Sizes

Post by Randy Bobandi » February 15th, 2021, 9:07 am

Sailboy42 wrote:
February 15th, 2021, 5:17 am
As I've looked at the fasteners, I found some unthreaded portion below the thread. I've found that they are always no more extended than .15 and slightly thinner than the rest. Is this a needed feature, are when I buy new bolts, I can ignore it.
You mean a pilot point? No, pilot points are not necessary. They do however, make installations a little easier and they help prevent cross threading, especially on an assembly line.

Is this style what you're referring to?
pilotpoint.jpg
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Sailboy42
Making Progress
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Posts: 54
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Vehicle Year: 1990
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Re: 4.0 Fastener Sizes

Post by Sailboy42 » February 18th, 2021, 11:21 am

Yes exactly, thank you

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