upper intake problem on '97 LeSabre

[BNaylor]

The LIM bolts are not Torque To Yield - TTY but GM recommends replacing them since they will have new threadlocker applied. I've reused old LIM bolts with no problems but you must clean all old threadlocker off first and apply the new. I use Permatex brand low-med strength threadlocker.

Also, on the UIM bolts GM recommends using the revised 132 in-lbs (11 lbs-ft) for the UIM bolts in the same old torquing pattern. Effective 2004.

[formzy]

Just another question on the LIM gasket replacement.
Is any kind of sealer used on the LIM gaskets or not? I know sealer is recommended on the end seals? but wasn't sure on the main gaskets that attach to the heads.

Also what is the difference with the gaskets that have locating pins(series II) ?Are there small holes that hold these gaskets in place? sort of like the pins or small stud bolts on the water pump?

Just trying to get as much info as possible before I attack this job.

Didn't even think about doing this (LIM)job as the problem right now is the leaking plenum on the top.Alot of threads though emphazied it wouldn't be too smart to bypass this job when the top half is off. (I agree). So far it seems external but some is probably being sucked into the upper intake and burned off. So far keeping an eye on the coolant level has told me not too much loss, but this can change at any time.

Thanks, Formzy

[BNaylor]

Our Buick Tips & Maintenance forum has an explanation between pinned and unpinned LIM end gaskets. See link below.

http://www.automotiveforums.com/vbul...d.php?t=700916

Use hi-temp RTV sealant on the corners where the port and end gaskets meet. On the revised GM aluminum framed port gaskets or aftermarket FelPro brand you do not need to apply any sealant on the port gaskets.

[octane23]

hey all sorry kinda new to this site......but i hope someone can help me out......96 buick lesabre...3800 series "k" motor.......i just bought it from an old woman whos husband past away and the car had sat for a year.....so starts, runs, drives, beautiful......now i do have experience with the intakes on the 3.1, 3.4 but the 3.8 is new for me...but i do know the plastic plenums leak.....my mechanic freind who has 22 yrs experience....had told me to change only the upper plenum, with dorman kit.......and leave the lower alone........i asked him is he sure because he always told me the worst feeling is going over something twice.........but he still insisted plenum only.........ive seen him rebuild engines in a day or two, and watched him rebuild rears,transmitions,starters, headgaskets, so much on so many cars and never came back to him with a problem.....i want to trust him but i dont have alot of money to take chances?

[rkpatt]

I just ordered the APM replacement upper intake plenum (aka UIM ) from APN) and the GM aluminum frame gaskets lower intake manifold ( aka LIM ) from www.partzoneonline.com ) . Now to find those step by step instructions with the details on the incidentals ...... ( any good links ?) - Thanks