If the bolt is ended, the new ones must be better? Those bearings like the Goetz rings are both Federal Mogel products. I'm pretty sure you won't go wrong there. Make sure you check your bearing clearances!!
So the two current bolts look very different... this is: 11247589671
And this is 11241713342 :
- - - Updated - - -
You think it is necessary to go as far as checking clearances on the new bearings, I do not believe Glyco makes undersized/over sized bearing halves, just BMW at $21 a halve
The new bolt almost looks like it could be a torque to yield bolt. It might be wise to consult with a BMW ENGINE BUILDER, or BMW parts dept. My thoughts are you might be ok not checking clearances, but plastigauge is cheap, or you could use micrometers, or have a machine shop check a few of them. It would be a real bitch to get it all together, fire it up, and have it come unglued.
Some interesting information about bolts, http://www.enginebuildermag.com/2001...rque-to-angle/
Called 2 BMW dealers so far including Gault, both were puzzled about these 2 bolts and why there are 2 options and which one to use..
One of the parts guys said, "go with more expensive one" LOL... ughhh
After looking at the newer bolt, it seems like BMW was trying to increase the contact area with the rod cap. I myself would go with the newer style bolts, but would also buy about 4 more, and torque a couple of rods, and check clearances.
umm... isnt 11241713342 a full 6mm longer than 11247589671
uh huh.....
So from my understanding, there were 2 styles originally, the 11241713342 stayed the same though out the years, the 11247589671 is an update to the older bolt of the same style.
It seems that the 11247589671 is designed to eat into the rod caps??
My original bolts look like 11241713342.
It's just weird that BMW put two options for the same application, I am sure there is an explanation to this...
- - - Updated - - -
Indeed...
Last edited by dragon850; 10-15-2015 at 11:31 PM.
This is truly a mystery that needs to be solved. Buy a new bolt and compare it.
Last edited by Mikekugel; 10-16-2015 at 12:44 AM.
Contact Wolf Wokke.. He has rebuilt a few engines.
Agree absolutely! I have never replaced rod bolts on any American V8 engines when rebuilding them, but BMW? Then again better safe than sorry. Buy 4 extras, to check a couple of clearances on a couple of rods, Autohauz has them http://www.autohausaz.com/pn/11241713342
Some of this was covered years ago.
http://forum.roadfly.com/archive/ind...11749574.html?
Purchased x 24 longer rod bolts more expensive option.$$$ Still don't know what is the difference between the two or which one is better. But I guess we know that Original longer bolt held just fine...
For the future reference, connecting rod bearings available for under $100 for a set: https://www.ecstuning.com/BMW-E31-85...cal/ES2626371/
A whole bunch of parts is coming so now its just a waiting game. Here is the piston deringed and cleaned and the block after prepping with block 600 grit sanding and cleaning.
ForumRunner_20151019_200912.png
ForumRunner_20151019_200925.png
Just love naked pictures! Keep them coming.
Sveinbjörn Hrafnsson
E30 CABRIO V12 M70B50 ///
ALPINA B10 BITURBO 346 @ 507
ULTIMA Evolution
Contacts
http://alpina.123.is/pictures/
just don't be taking any grit sandpaper to those pistons...
Bookmarks