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Old 02-28-2012, 08:22 PM   #1
cfh
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Yellow vs. Blue Loctite?

Today I replaced the factory installed TPS unit on my throttle. I could not remove the two bolts attaching the TPS unit. I had to take the throttle body to my mechanic to removed them. He confessed they were really difficult to remove (and he's really good, not cheap but good). He got the bolts out, but the bolts couldn't be salvaged and had to be replaced.

He mentioned something in passing about using blue loctite vs yellow. I wasn't sure what he was talking about.

Does anyone have any thoughts on blue vs yellow loctite?

P.S.: He didn't charge me for removing the bolts, and gave me replacement bolts for free, I think he's amused by my recent efforts in making my own repairs. He said, "when you start to hit your head against the wall, I'll be here."

Regarding that last thought, if you have any thoughts about a stubborn CEL light, code 2.4 please check out my post on that. I don't want to walk into his shop and say, "O.K. - you win...:-("

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Old 02-28-2012, 08:40 PM   #2
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I've never heard of yellow Locktite but that doesn't mean it's not out there somewhere. Blue Locktite is typically thought of as non-permanent and Red Locktite is typically thought of as permanent (needs lots of heat to remove). Just a tad of Blue Locktite is all you need.

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Old 02-28-2012, 08:59 PM   #3
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Loctite doesn't make a yellow threadlocker, but there is yellow out there. We use red, blue and yellow on the helicopter. Like Jerry said the red is pretty permanent. You are supposed to have to heat up the fastener to remove it, but I have removed lots of them without doing it. Yellow is a medium strenght fastener, and blue is, like he said, for things that are taken apart frequently. There are other colors and there are threadlockers that will wick their way into fasteners that are already screwed in.
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Old 02-28-2012, 09:05 PM   #4
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I use red for everything that needs locktite. I use less as the bolts get smaller. I've never had an issue getting them out.
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Old 02-28-2012, 09:05 PM   #5
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Thanks for clarifying. The original bolts, which were really hard to remove, had yellow coloring on their tips. He just mentioned something about blue loctite in passing. He was busy, and I didn't want to waste his time.

BTW: Jerry thanks for all the posts, we've never met, but you've already helped me resolve several issues.
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Old 02-28-2012, 11:32 PM   #6
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i know purple is light weight, blue is everyday stuff, red is as decribed...hard, and green is the wicking kind. I think factory assembly lines use a yellow, I've seen it on a lot of bolts that I have taken out for the first time in their life, but never seen it in a store
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Old 02-28-2012, 11:54 PM   #7
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Quote:
Originally Posted by jgorm View Post
I use red for everything that needs locktite. I use less as the bolts get smaller. I've never had an issue getting them out.
You must not be using enough or you've been lucky so far...my buddy tried to remove his old wrecked truck seats to put em in his Suzuki Samurai that had red loctite on them and had torx or allen heads. We stripped those out while using breaker bars to try to break em free. Ended up trying to drill them out...took us ages...(couldn't use heat...carpet was still in there), tried to drill them and snapped the bits. Ended up using an air hammer and slowly but surely chiseled the heads off.
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Old 02-29-2012, 10:11 AM   #8
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Quote:
Originally Posted by s3nt3nc3d View Post
You must not be using enough or you've been lucky so far...my buddy tried to remove his old wrecked truck seats to put em in his Suzuki Samurai that had red loctite on them and had torx or allen heads. We stripped those out while using breaker bars to try to break em free. Ended up trying to drill them out...took us ages...(couldn't use heat...carpet was still in there), tried to drill them and snapped the bits. Ended up using an air hammer and slowly but surely chiseled the heads off.
Maybe you are using too much. I have never had a bolt loosen with the amount of red locktite that I use. I typically make a thin line down the bolt. Or just a little drop on the tip if its a small bolt.
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Old 02-29-2012, 10:44 AM   #9
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It would help if you referred to the Henkel threadlocking compounds by their number along with the color. There is a fair bit of strength difference between 271, 272, and 277 which are all red.

I use a lot of the 271 and 272 with the main difference being viscosity.

As far as green being the wicking grade. I use a lot of 609 which is green and it is not a wicking grade which IIRC is typically the 290.

I don't know who makes the yellow stuff, never used any, but I have a lot of factory fasteners that have it pre-applied.
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Old 02-29-2012, 11:59 AM   #10
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Loctite Threadlocker Properties chart :

http://henkelna.com/us/content_data/...ide_032010.pdf

This list is not all-encompasing, but covers the majority of uses that Jeep enthusiasts would encounter.
We use some of these, and others not on this list in the assembly of Bradley Fighting Vehicles (and our other product lines)

Edit: For those interested, here is a page that covers many of the Loctite product applications.... much more than threadlockers!

http://www.grampianfasteners.com/Loctite.aspx

Info on yellow threadlocker:

http://www.bradleygroupcoatings.com/...php?prod_id=36
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Old 02-29-2012, 12:35 PM   #11
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Quote:
Originally Posted by lynn View Post
Loctite Threadlocker Properties chart :

http://henkelna.com/us/content_data/...ide_032010.pdf

This list is not all-encompasing, but covers the majority of uses that Jeep enthusiasts would encounter.
We use some of these, and others not on this list in the assembly of Bradley Fighting Vehicles (and our other product lines)

Edit: For those interested, here is a page that covers many of the Loctite product applications.... much more than threadlockers!

Loctite : Grampian Fasteners : Grampian Fasteners

Info on yellow threadlocker:

Bradley Group Coatings - Loctite Dri-Loc 200 Yellow
good info

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