flywheel bolts
 

can i use normal bolts in the place on the special mb bolts on my 300d? the bolts sure are costly

IIRC these are stretch type fasteners. I do not know what would happen if you used regular fasteners but the work involved resolving any issue with them would not be worth the cost savings. Stick with the MB stretch fasteners for this application in my opinion.

X2
If you were to use regular hi-tensile bolts, what torque would you do them to? They will not stretch like the proper ones do.
If your old bolts are within the max allowed length, you may be able to reuse. Though, I would no wish to need to pull it to bits again because a bolt or 2 let go.

I see the problem differently. I think if you find comparable Blots at Hardware store they would likely be Asian made.
That might be OK if they were Japanese or maybe Korean but the other Countries?????

At the local Industrial Hardware Store that kind of specializes in Nuts and Bolts I listened in on a conversation.
This Guy owned some Heavy Earth Moving Equipment and He said that if He bought the same Grade of Chinese Bolts in a Moth of use the Popped off.
If He bought the USA Bolts He would get several years of use out of them before they Popped.

1109900419 The part number for the Automatic Transmission Flywheel Bolts.
It may be that place I suggested in My PM does not sell them any more but I am still looking.
Added: OK I plugged the Part number into the search feature and they do have them but they are $6.40 each.

What is the max stretch of these bolts? Anyone got the spec sheet on this? I am interested in the manual flywheel bolts.

It should posted in this thread anyway, down the road, when someone searches it will be posted.

Check startekinfo.com
Look in shop resources, w123 car and you will find a free manual for the car.

Just in case someone is not in the mood to look up the part number:
Russian part site. Nearly all in in English.
http://www.auto-parts.spb.ru/cat/cats/m.mycat?cat=mb&client=dr2000

This is very true. They crack as soon as you load them up. They probably start with low grade steel & try & get the required hardness by heat treating & quenching. They end up as brittle as a fresh carrot.

Thanks for the Russian link.

*EDIT*

Found it under startek
disk 2
I used 240d
main 03 "cylinder crankcase and crank assembly"
section 410 "removal and install flywheel"


as new 8.5-.02
min. dia. 8.1
length 20
this is for a manual trans flywheel bolts

Just to clarify. Measure at the neck (waisted shank)area not the thread area, to see how far the bolts have stretched. After measuring my used bolts, they were in the 8.3 to 8.4 range, so these are within spec.

what is the max stretch on these bad boys anyway? haynes manual sucks!

here is a link to another thread with the info on auto trans bolts
http://www.peachparts.com/shopforum/diesel-discussion/254852-flywheel-bolt-size-tightening-torque.html