Originally Posted by
Deepsea21
I haven't had to change my CPS yet but keep a spare on hand for when/if the time comes. My question is what is the material of the OEM bolt? Is that an aluminum or aluminum alloy bolt and what is the metal that bolt screws into? A stainless steel bolt screwed into an aluminum or aluminum allow receiver will corrode. Steel/Stainless Steel and Aluminum in contact with each other causes galvanic corrosion and you could end up with a real mess on your hands. I'll also note that brass in contact with Stainless Steel will corrode for the same reason.
Maybe others can comment on my thoughts?
I thought about this myself and a quick google search to ease my concerns found that the engine block on the M112 is Light Aluminum The OEM bolt was not aluminum as I dropped it and had to use a magnet to pick it up. Although you are correct about the possibility of corrosion according to google it is one of the safer choices as the area of contact is a minimal only the threads, the bolt head itself does not touch the engine block. And the sensor itself has a brass sleeve inside of it so apparently Mercedes Benz didn't feel it presented a problem. At any rate I will swing back by ACE hardware and see if they have an aluminum bolt. Just a side thought. Arn't spark plugs stainless and they go into aluminum blocks all the time.
Originally Posted by
WD40
Same here. I even keep it in the trunk! Furthermore I bought a 'bendy' 6" long 3/8" extension shortly after buying the Xfire as someone on the forum suggested. I am so dumb have so much faith in you fellows that I never even put my ability to reach the bolt to the test! I simply looked at it and thought, "Yeah, that's doable." When next I find myself in the garage with time on my hands I'll assemble my tools together and find out what all the noise is about!
WD40 what the noise is about is for me I have large hands and it is a somewhat tight fit. There are two heat shields that cause problems. The one right next to the sensor is a heavier gauge aluminum that with a long extension or a heavy set of plyers can easily be bent back a little in order to get your hand or tools in. The second heat shield is the tall one that comes up by the brake master cylinder. There is an 8mm bolt that holds it on just in front of the master cylinder that is easily removed, and this is very pliable material and can be folded down to give a bit more work room and a better angle to get to the bolt. It is also very sharpe and will cut up your arms and hands. If your extension is too long it will hit this shield and you won't be able to get the angle needed to get a purchase on the bolt. a shorter extension of about 10 inches I think is best.
You are right most metrics are 1.25 or .7 but this is a 1.0 It screwed in smooth as butter. Im not sure what the length was I think 30mm but not for sure. I had planned to buy longer and cut it down with a dremel to the right length but the spacer made it just right.
I replaced the sensor this evening when I got home, and it went in easy peasy. The longer bolt made it very easy to line up and I could see it well enough to put the socket on it. below are the pics installed and screwed in. The bolt was easier to see before tightening it down but still half visible from the top even after it was tightened.