Rod Bolts

[FMJ]

Hey all, sorry if this has been covered before but I couldn't find it. Here are some pics of the rod bolts from my blown motor and a rod bolt from a 1990 new manufacture motor, bolt on the right, seems to me the new bolt looks a bit sturdier than the "old" style bolt. The new style has a different stock number than the old bolt, any thoughts?

 

[Heath_h49008]

There were a few other threads on rod bolt failures, but nothing I have seen that had this info and certainly no mention of two different style bolts with a failed one, good failed, and new "beefier" style.

Great find and thread! I remember a few folks with resources to test bolts who were offering to test any failed examples. I have Western Michigan University's engineering campus as a playground if nobody else steps up.

 

[FMJ]

Well I have a complete set of the "new" bolts, and I don't think I want to part with them. The old bolt has this number: 10935343 on them as noted in other threads, the "new" style bolts have numbers as well, FC 11642059?

 

[FMJ]

Found this searching the web:

11642059

4140

12 Point (Double Hex)

Bolts/Screws

9/16

at this site:
http://www.msaerospace.com/products/Bolts%20Screws---page3/1&sort_by=&url=adv_search.php&row=50&page=3

Line 11

 

[FMJ]

Just did an RFQ for 144, we'll see what happens. . . .

 

[FMJ]

Did more searches and found this, part number 11642059 crosses to NSN: 5306-00-937-2295 which comes back to this Publication TM 9-2815-210-34P, I think I've found a winner! now to find a supplier. . . .

 

[FMJ]

Here are the specs on the old style bolt: http://www.nsn-now.com/Indexing/ViewDetail.aspx?QString=5306000673383

 

[gimpyrobb]

I don't have much to add other than Westy sent the specs to ARP and their quote to make some was WAY out of line, like $120 per bolt. Finding some of those bigger-badder bolts sounds like the way to go.

 

[JasonS]

This may be easier:

http://www.tractorjoe.com/parts/p/h...tor/b/white-agco-white/m/2-144/?c=109&sc=2438

 

[FMJ]

It might be, except there are no specs on the bolt and no pictures.

Saw that link in another thread.

 

[JasonS]

It might be, except there are no specs on the bolt and no pictures.

Saw that link in another thread.

Pretty easy to find out. I sent an email asking if they are 12 pt or 6 pt.

 

[FMJ]

Pretty easy to find out. I sent an email asking if they are 12 pt or 6 pt.

Let us know when you get an answer, and what material the bolts are made out of.

 

[JasonS]

However, it appears failures still occur with the 12 pt bolts:
http://www.steelsoldiers.com/showthread.php?66437-Major-Meltdown!!-(/page8&highlight=mortum

 

[JasonS]

Pic from above thread:

 

[FMJ]

Both of those rod bolts look intact to me. . . .

 

[JasonS]

Then agan, that rod/ cap looks intact; maybe a different failure mode.

Beat me to it....

 

[FMJ]

Broken rod/piston? let the small end fling around and destroy?

 

[Heath_h49008]

That failure was a hydrolocked motor... not a rod or bolt issue.

The 12pt bolt still keeps it's good name on that case, at least.

 

[FMJ]

Apparently the 12 point bolts are 4140 steel with some amount of gold or platinum mixed in for added value. . . .

Got a quote from these guys: http://www.parts-query.com/jsp/sear...5&pagelimit=0&buttonno=0&detect=true&planid=1

$35.00 Each. . . Maybe if you are a company you get a better price?

 

[JasonS]

Let us know when you get an answer, and what material the bolts are made out of.

"We don't know"