LIM and UIM gaskets, Dillon intake install, valve cover gaskets, and misc other little things:


Eric arrives. His car looks purple at some angles/lighting. Blue most of the time.















This UIM gasket was installed with the UIM sometime after 2002.



New style AC Delco UIM gasket.



The infamous 'sludge pocket' on an L36. This ends at a blind port on the LIM.












New Delco Aluminum framed LIM gaskets.






Dillon intake with blocked coolant passages and sleeved EGR port.



LIM ready for re-install



TB (minus throttle plate and sensors) after cleaning.



Note the odd butterfly (throttle plate). I know this wasn't used in 97, so 98 may
have been the first year. It'* probably not desired for WOT performance.









Elbow was already eroded in half (did not break when removed, and was
probably leaking a little).



Two front studs for the fuel rail weren't 'lefty-loosied' by the car owner,
so I dremel'd slots and removed them with a screwdriver. Replaced them
from my spare parts collection.



Freshly kissed with a file, ready for reassembly.



Note the orange o-rings on the new coolant elbow posted 3 pics above. It'* a
coating designed to ease installation. It hid this factory (AC Delco) flaw in
the o-ring, and caused another top end teardown the following day.






Mildly drilled (for air burpage) new 180° thermostat ready for install.






Air cooling (breathing) ports drilled into the now blocked coolant passages.
Do NOT do this on an unblocked UIM!

Looks like a job well done. He'* no longer a fix-it virgin

BTW....The 98-01 MNB does have the tendancy to look purplish at certain angles I also noticed he has the dreaded chippage along the top of the fender too

Great documentation!

I always remove the alternator when I do the job. I'll have to keep in mind that it doesn't have to come off when I go at the job again.

We rotated the alternator up a bit the first time.

Second day, when I went after the bad (new) coolant elbow, I left the alternator in place and only removed the rear brace.

a little of topic but if i was eric i would leave the cover off and put on a new intake system
but thats just me
good job guys keep up the good work will

Wake, Oregon winters can get quite cold. He doesn't plan to remove the engine cover until next spring.

Thanks for all the good pics! Just more good info to know.

Not to go off topic, but does the Valley get really cold? As in like 15* temps we get here?

Nice job!! And kudos for finding the O-ring Flaw. As boost posted in another thread, I will be doing my lower intake this weekend at his place.

I can't believe that little flaw in the o-ring caused such a huge problem that night! You can see the dirt on everything better in these pictures than you could in real life! haha.


It rarely gets down to 15* but its not unheard of by any means. Gets below freezing quite often however.