Renix thread size

[Jackrabbit41]

I need to get some bolts to put my motor on its stand, what's the thread in a 89 renix? I want to get like 3 or 4 grade 8s

[cruiser54]

http://www.kelleyswip.com/screws.html

[big66440]

I'm gonna take a shot at this, I believe they are 3/8x16, I don't know the length sorry.

[cruiser54]

I believe there are 2 different sizes. 

 

3/8-16 on top for sure. 

[87MJTIM]

The 9 o'clock and 3 o'clock are 7/16" - 14 x 3"

[cruiser54]

How's this?

 

Jeep 4.0 engine to trans bolts

 

Should you need to fasten your 4.0 block to an engine stand, these are the bolts you’ll need. 

 

The top 2 are 3/8 by 16 and the lower 2 are 7/16 by 14. 

[Jackrabbit41]

Back in September I out a motor on a motor stand no trouble but now, I have a different motor stand and the thing can't go wide enough to fit all 4 on the motor so i tried 3 and my grade 5 bolts all bent lol. The hardware store guy said grade 5 cus grade 8 would snap.

[Jackrabbit41]

I used 5 inches but they were a little long so I'm gonna try 4 inch grade 8s tomorrow

[gogmorgo]

You may be better off modifying the stand. Also, if it doesn't go wide enough, it may be too small for your engine. A 4.0 (or any straight six) is very long and puts a huge moment onto its mounting points when only supported at one end.

 

And as to the notion of grade 8 bolts being brittle and breaking? Pure poppycock. One of those old-man myths that even some of the most respected people in automotive circles keep regurgitating.

[Jackrabbit41]

It needs to go about 1cm wider so I'm having a friend at school use the mill to widen the slot

[Jackrabbit41]

 

Getting the mount machined so the slots are longer so it'll fit my motor

 

 

Sent from my iPhone using Tapatalk

[Minuit]

The "grade 8 bolts snap, grade 5 bolts bend" myth is stupid Facebook bullcrap and anyone who repeats it needs to shut up and engage their brain before they engage their mouth. You probably shouldn't believe anything else people who repeat it have to say either.

 

Grade 5 bolt yield strength (in other words, the  stress at which the bolt begins to noticeably deform): 81,000-92,000 psi depending on size. Tensile strength (the most stress the bolt can take) of 120-105ksi depending on size.

Grade 8 bolt yield strength: 130,000 psi. A grade 5 bolt of the same size will already have broken by the time a grade 8 bolt yields.

 

Maybe I should make a list of all this BS bad advice you see floating around and explain the truth?

 

[big66440]

The "grade 8 bolts snap, grade 5 bolts bend" myth is stupid Facebook bullcrap and anyone who repeats it needs to shut up and engage their brain before they engage their mouth. You probably shouldn't believe anything else people who repeat it have to say either.

 

Grade 5 bolt yield strength (in other words, the  stress at which the bolt begins to noticeably deform): 81,000-92,000 psi depending on size. Tensile strength (the most stress the bolt can take) of 120-105ksi depending on size.

Grade 8 bolt yield strength: 130,000 psi. A grade 5 bolt of the same size will already have broken by the time a grade 8 bolt yields.

 

Maybe I should make a list of all this BS bad advice you see floating around and explain the truth?

 

I thought everything on the internet was true :wall:

[Jackrabbit41]

The guy that told me that was a old guy at the hardware store lol. But when he said that it seemed crazy to me but I believed him