Iggy

Ok, so I decided to tear my Q-Jet apart to clean it out and freshen it up.
I'd like to do this right the first time and not having to worry about screws coming loose. What, if any, is the proper torque for the carb body to base and top cover to body screws???
I have a book that covers the Rochester carbs but there is no mention of torque for the screws.
I'd hate to tighten them too much and warp everything. I plan on using Loctite 222 (Blue) on all the screws.

Thanks.

GOODT

No need to use loctite most of the screws have lock washers there is no torque spec except securly

cig1988

Dont forget to epoxy the lead plugs. They have a tendamcy to loosen over time creating a vacuum leak.

Iggy

Thanks GOODT I'll follow the pattern.

I'll check the lead plugs too.

BillK

Iggy,
Dont know which book you have but this one is sort of considered the Q-jet bible. It has very detailed instructions for rebuilding and modifying if needed.
http://www.amazon.com/gp/product/089...lance&n=283155

GOODT

ive read through that book it is about the best on q jets ive seen....


If you need any more info from the merc manual let me know

Iggy

Got it and the Haynes manual too.
I'll just tighten the screws till I feel they're tight enough and let the Loctite 242 do it's job.
Oh, I found that the Loctite 242 would be a better choice that the 222 in this situation.

Thanks guys.

GOODT

Been building carbs 25 years never use loctite. no need just use lock washers if you get a little corr you will never get back apart if you use loctite and there is no need for it....

Iggy

Depends on which Loctite product.
The #242 is a service removable thread locker. The 222 (Blue) is a small screw, service removable type. Loctite does make a type that is non-removable. I'd never use that one.
For the 18 years I've been working on military training systems we've used Loctite on many, many, components and I have never had a screw or bolt that couldn't be removed for service.
I use the #222 on small adjustment screws on instruments that I calibrate. I have never had trouble re-adjusting any instrument using a jewlers screwdriver.

GOODT

I know I use red blue and green all the time no need to and the torx screws will tend to stick on there own with out any help from locktite have broken many a torx bit getting them apart with out lock tite on the threads

but its your boat