Having Trouble Removing a 12mm Triple Hex Head Bolt OM 617.952 300D - Page 2 - PeachParts Mercedes-Benz Forum

Diesel911 · #16 05-23-2021, 05:38 PM

Quote:

Originally Posted by merc lover

use a syringe with a needle to carefully apply Kroil penetrating oil to the bolt. The Kroil will seep down to the threads. Just before you go to bed, put some more Kroil Oil on the bolt using the syringe with a needle. Next day, use MAP gas heat to heat up the bolt. This method has not failed yet......

Once you try Kroil Penetrating Oil you will wonder how you ever got along without it.....

https://www.amazon.com/Kano-Kroil-8oz-Can/dp/B00DR7F4AO/ref=sr_1_25?crid=748DHVODRGOF&dchild=1&keywords=kroil+penetrating+oil&qid=1621799334&sprefix=kroil%2Caps%2C321&sr=8-25

I did want to hear what others did. I already have the Cylinder Head off of the Engine.

The don't sell Kroil anywhere locally. I did use PB Blaster which Home Depot sells.

Diesel911 · #17 05-24-2021, 05:21 PM

I found I had another triple hex tool. Made by Cornwell USA. I had in the past years bought 3 different lots of tools for Mercedes and now that I rediscovered it remember it was one of those tools.

The other tool can be turned into the T handle that was mentioned.

BillGrissom · #18 05-31-2021, 07:51 PM

Quote:

Originally Posted by Diesel911

... The other tool can be turned into the T handle that was mentioned.

For those who already have the triple-square male socket, you might buy the 3/4" drive socket set at Harbor Freight, which comes with a stout T-wrench as shown and a long-handle ratchet wrench. With an adapter, you can attach to the 1/2" drive socket. Besides this one job, you will find the large sockets useful for other things like when you need one that fits to press a cylindrical part. I bought that socket set long ago to remove a FWD axle nut (250 ft-lbf spec) and had to jump on the socket wrench to budge the nut, though now have the HF Earthquake air wrench and air compressor which makes that easy.

I did a little googling. The link below is helpful. While triple-square have 12 points, they differ from a "12-pt" head. The former is termed ZXN and the later can be termed "double hex". The difference is in the angle of the flats. triple-square has 90 deg corners, which grab better (see post 16 in link). Torx is totally different. Triple-square are mainly found on Euro cars in 6, 8, 10, and 12 mm. I recall that later M-B engines have head bolts with male socket heads (12-pt?). BTW, if you ever need to rebuild your transmission, the rear output shaft is secured with a 12-pt male nut. I had to buy a set of large 12-pt metric impact sockets at HF to remove that.
https://www.pirate4x4.com/threads/stupid-question-12pt-vs-triple-square.2601314/

Diesel911 · #19 06-02-2021, 01:11 PM

Quote:

Originally Posted by BillGrissom

For those who already have the triple-square male socket, you might buy the 3/4" drive socket set at Harbor Freight, which comes with a stout T-wrench as shown and a long-handle ratchet wrench. With an adapter, you can attach to the 1/2" drive socket. Besides this one job, you will find the large sockets useful for other things like when you need one that fits to press a cylindrical part. I bought that socket set long ago to remove a FWD axle nut (250 ft-lbf spec) and had to jump on the socket wrench to budge the nut, though now have the HF Earthquake air wrench and air compressor which makes that easy.

I did a little googling. The link below is helpful. While triple-square have 12 points, they differ from a "12-pt" head. The former is termed ZXN and the later can be termed "double hex". The difference is in the angle of the flats. triple-square has 90 deg corners, which grab better (see post 16 in link). Torx is totally different. Triple-square are mainly found on Euro cars in 6, 8, 10, and 12 mm. I recall that later M-B engines have head bolts with male socket heads (12-pt?). BTW, if you ever need to rebuild your transmission, the rear output shaft is secured with a 12-pt male nut. I had to buy a set of large 12-pt metric impact sockets at HF to remove that.
https://www.pirate4x4.com/threads/stupid-question-12pt-vs-triple-square.2601314/

Wow, I bought one waaay back when it was called Harbor Ship and Freight. It is not charmed but kind if like a packetized finish. It was a great buy. I think I bought it in the late 1970's but unsure of my memory.

The newest ones are different.

The KD2306 that a cut down and the new replacement I received are both US made. On the back of the package of the new one it has "used to install 12-point (triple-square) metric socket head screws" At the tip it his "12mm serrated wrench"
The Cornwell tool has a top part for the socket wrench which is PS3214 and a separate bit CSD-12mm and has teeth in the same shape of the KD Tool. So both tools are indeed triple-square.