LB7: injector cups Loctite where specifically ??

[merlot]

injector cups Loctite where ? on the injector cup cone to head or the bolt holding them
Its my first head job on a duramax and I was told to use it in the forum but just not specifically where or what grade /strength

 

[PureHybrid]

Usually people use red, 242 IIRC. Can also use the green stuff made for interference fits. Can't remember the number. Apply to the taper and the short shank at the end that fits into the head. Can also use on the hold down bolts. Hope this helps.

 

[JoshH]

I would also use an activator to help seal it well.

 

[x MadMAX DIESEL]

242 is blue. Medium strength. Don't let the loctite set up to much before tightening them down

 

[merlot]

thankyou guys I appreciate it a lot :thumb:
I was thinking that's where but hey you never know and I'm not a know it all either thanks again

 

[juddski88]

Make sure you didn't leave any old residue in on the sealing surface of the heads

 

[hondarider552]

272 locktite only.

I put my cups in a bath of them when I put them in. 9000 miles and tons of nitrous later, no problem. wait 24 hours before adding coolant.

 

[PureHybrid]

242 is blue. Medium strength. Don't let the loctite set up to much before tightening them down

262, sorry. Do like josh said, hit the surfaces with primer and let it dry, apply loctite and install right away. The primer can I have is 7649.

 

[Chevy1925]

272 locktite only.



I put my cups in a bath of them when I put them in. 9000 miles and tons of nitrous later, no problem. wait 24 hours before adding coolant.

So that's where all my loctite went..... Lol

 

[PureHybrid]

272 locktite only.

I put my cups in a bath of them when I put them in. 9000 miles and tons of nitrous later, no problem. wait 24 hours before adding coolant.

Whyyyy? I can see dipping the end in, but 75% of it only touches coolant.

 

[hondarider552]

I was exaggerating

 

[PureHybrid]

Ah ok. Well you know what they say, if it isn't dripping off there isn't enough on there!

 

[Chevy1925]

oh he used alot on them but so do it, its just like an "extreme" amount lol. i wanna know those bitches sealed

 

[merlot]

I ended up using Red high temp permatex brand (Napa #) 765-2680 Loctite and just down at the tapered part where it seals and not to much ,just a decent coating , cleaned the heads good with carb clean and a 1 1/4 inch round nylon brush let it sit 24 hours added coolant and no more pressurized cooling system, well live and learn it sucked taking it apart again to do but it was my first head gasket job on a Duramax and alls well now thanks again for the help