You have the threaded bolt that fits the hole. Use it to determine the thread count and pitch.. Perfect match.
That should be a blind bottom hole. Use the Helicoil taps that will come with the kit for that hole size and thread match. Use wheel bearing grease to fill the lands of the tap. that will capture most of the material removed... When re tapping the hole, back the tap out and clean the grease out with the thread shavings. Carb cleaner spray works, tap held in a cardboard box and safety glasses.. Spray down the tap hole with carb cleaner to carry the chips out, hit it with a shop vac for a bit, recoat the tap with grease and gently continue threading to match the heilcoil thread insert.. Repeat as necessary to gently make a new set of threads for the insert. Carefully install insert threads with the kit tool... PER INSTRUCTIONS break off the bottom tang of the insert [this is what screws the new insert into position... If you followed the kit instructions, you then have NEW threads, and the pulley bolt will torque to spec and bottom to the location flange built into the bolt. Good luck. On Sun, Oct 25, 2020 at 2:04 PM Kaleb Striplin via Mercedes < mercedes@okiebenz.com> wrote: > Any idea what size helicoil it would be? > > On 10/25/2020 4:01 PM, G Mann via Mercedes wrote: > > Time for a Helicoil thread repair kit. > > That mounting is a high stress area, with a repeated high failure rate.. > It > > needs full thread contact and regular inspection of the bolt for working > > loose. > > > > Spend the money and time to repair the thread, It should last for a good > > while... Don't repair it, just kluge it with JB or something, and when it > > lets go and the pulley/ belt/ fan eats whatever is handy at highway > > speed... you get to buy lots of new parts and labor... > > > > Your call... Helicoil repair kit would be mine.. > > > > On Sun, Oct 25, 2020 at 1:52 PM Kaleb Striplin via Mercedes < > > mercedes@okiebenz.com> wrote: > > > >> Working on my fathers 98 e300 doing routine maintenance. Noticed the > belt > >> tensioner was cockeyed. Typical. On this car the tensioner was loose > with > >> the PO and he I believe used some lock tight and tightened it back down. > >> The threads were somewhat stripped out. I was aware at some point it > could > >> become an issue. When I removed the bolt it was tight, not loose so I’m > >> sure the tensioner is just worn out. When I go to replace it I don’t > think > >> I’m going to be able to crank down on it like normal. It appears the > first > >> half of the threads are stripped so it’s just grabbing with the back > half. > >> Think I should clean it up real good and used either red or blue > locktite? > >> What about JB welding it? What about running a tap down the hole to > clean > >> it up? Anybody know what size it would be or if that would even work? > See > >> photos and video below. > >> > >> https://youtu.be/cWiG0ihny0M > >> > >> > >> > >> Sent from my iPhone > >> _______________________________________ > >> http://www.okiebenz.com > >> > >> To search list archives http://www.okiebenz.com/archive/ > >> > >> To Unsubscribe or change delivery options go to: > >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > >> > >> > > _______________________________________ > > http://www.okiebenz.com > > > > To search list archives http://www.okiebenz.com/archive/ > > > > To Unsubscribe or change delivery options go to: > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
