LIM & UIM REPAIR - part numbers and suggestions?
 

I am going to change and fix the LIM / UIM leak that I have and I need help with all the parts I may need.

1. Which gaskets work for you and there part numbers?
2. What else needs to be changed or repaied when this procedure is tackled?
3. Becarefull with ___________ (fill in the blank)
4. Part numbers for what ever I need will be great.

After posting a thread about Bob Dillon and his fix, I did not receive any negative feed back so I might go with his fix, but just in case, What is the part number for the UIM at
AUTOZONE or PEPBOYS?

I have read the archives and found a good article written by Bill Buttermore, thanks for the link in my other thread.

whats the link i think i'm going to be tackling this in my bonnevile before the winter hits.

this is the link to the write up
http://www.bonnevilleclub.com/forum/...565&highlight=

Does anyone sell an EGR pipe that is made for the old LIM and is sized down to fit into a stock UIM inner diameter to give the necessary airgap needed?

I still have a couple of reduced diameter stovepipes ($10) and sleeves ($5) available for those who want to try the fix outlined in the thread cited above. If Bob D. does your sleeve, you won't need a sleeve from me, but unless you want to make your own, I don't know where else you can get a reduced diameter ss pipe. PM if you are interested.

Attachment 73286

Here is a picture of my current inventory. These are pieces I made to test production methods. The overall heights are close to identical, but the shoulder heights vary somewhat. (Shoulder height is not critical.) The sholulder ODs are identical, and that's what provides the fit. I have some more sleeve stock to cut if there is a demand.

Bill sent me one of his reduced diameter stovepipes, and it's a nice piece. I didn't have it when I installed the sleeved UIM on my own car, but for a lousy $10, I sure would have! . :D

What are some signs of the uim failing. I'm not leaking any Coolant or anything i have noticed that when ireplaced my Alternator that there was a lot of grease and crap underneath the Alternator near the Intake manifold tho i dont know i might just replace it for the fact of just doing it. It's got a 109k on the odo so i'm sure it woudn't hurt.

First indication of UIM failure is usually loss of coolant at a greater rate than evaporation, which is very slow. If the leak is to the outside, coolant running down over the transaxle. Otherwise, no external leaks or drops underheath the car, but coolant level continuously dropping indicating an internal leak. This does not for sure indicate a bad upper; it may be a failure of the lower intake gaskets to the cylinder head, or in very rare cases, a bad head gasket. Internal failure of the upper can result in coolant drawn into the combustion chamber whcih you may be able to see by examining your plugs. If it is a trickle into one cylinder, that plug will appear cleaner than the rest. Coolant through the combustion chamber will destroy your oxygen sensor, too.

The uppers can fail catastrophically too. One minute everything is fine, the next, tons of white smoke as coolant pours into the combustion chambers.

A cooling system pressure test will reveal if you have an internal leak.

When removed, the upper plastic manifold typically looks OK around the stovepipe until you start to test its integrity with a sharp pick. The heat carbonizes the plastic leaving a soft, porous residue that appears to be solid plastic, but is really rotten.

https://img.photobucket.com/albums/v...Picture271.jpg

Just like Bill said ;)

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I highly suggest using the sleeves made by Bill. Either that, or get a fully installable UIM from Bob Dillion. It's the sure bet that you won't see a failure down the road.

I'm willing to bet that the lower intake gaskets take a dump before my Bob Dillion upper fails!

thanks for the quick replys back....

Bill you have a PM

Bob you have a PM

Any sugestions on which brand of Gaskets to get and most importantly, what are the PART NUMBERS?

Also any other items that need replacing while I have it all apart?

180 F thermostat - any sugestions on a Brand to get?

Any sugestions on which brand of Gaskets to get and most importantly, what are the PART NUMBERS?

Also any other items that need replacing while I have it all apart?

180 F thermostat - any sugestions on a Brand to get?

I am a fan of both Factory and Fel-Pro gaskets....

I believe that Bill Boost, did his lower gaskets and actually was asked which generation Fel Pro gaskets he wanted for his application... The second generation is just like the upgraded 2nd gen GM gaskets, without the $50 price tag I think...

You will also want to replace the coolant Bypass Elbow....

I reccomend a Stant 180F if you are in a warmer climate, If it gets bare bones cold then hold onto the 195F....

;)

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Here are a couple more things to consider. No matter which thermostat you choose, drill at least one 1/16" hole in the flange to allow air to move from the engine to the radiator. The little hole will allow some coolant to escape the engine during warmup, and will slightly increase the time it takes for your heater to get hot in the winter, but will make it much less likely for the system to become air-bound.

When you are re-assembling the engine, leave the thermostat out until last. When everything else is done, fill the engine with coolant mix at the thermostat hole, then install the thermostat. This is done to avoid a big air bubble in the top of the engine on start-up. After the drilled thermostat is installed, continue to top up coolant at the radiator until full. You can "pump" the upper radiator hose by squeezing it to encourage the displacement of any trapped air. Wait a few minutes, and fill again. Repeat until the level no longer drops in the radiator. Then top up the overflow tank.

anyone have a part number for the 2nd generation Fel Pro gaskets ?

Where would I get one of these coolant Bypass Elbows?

anyone?

I'm not sure what the part number is, but just stop by an AutoZone or Advance Auto. That's where I got mine.

Is that where I could get one of these coolant Bypass Elbows?

No. The only place to get that coolant by-pass elbow for an L36 is from the dealer. It costs $7.00. Unfortunately, they only carry the plastic one.

Word has it that there's a metal one available but I haven't heard how good it is...

I am searching the local auto parts vendors (Autozone, Checkers and so on) and I am getting part numbers for LOWER gaskets but non for the Upper Intake Manifold...

I am confused, does the lower also have the upper gasket included in the package?

This is what I am getting when I search:
"Second design w/Rubber-plastic end seals w/Locating pins; Lower Set"

well I just saw a picture of the contents and there are NO upper gaskets?

if you buy your UIM from GM, it will have the UIM gaskets in the box.

If you buy from an auto parts store, stop by, and ask them to open the box.

P/N's:

Updated LIM Gasket: 89017400
Updated Upper intake Gaskets: 89017554
Stupid Coolant Elbow: 24503423

for prices, go to www.gmpartsdirect.com

<edit>

Iridium Spark Plugs (if you feel so inclined): 12568387

Nick... with the differences of SC to NA I wasn't sure on the gaskets.

http://www.bonnevilleclub.com/forum/...intake+gaskets

Here's my link and what I found. The coolant elbow was found as a two pack in my case at a local parts house (not a chain) that supplies local dealers etc with factory GM parts.

You will notice the elbows were made by "Help" and can be found under that part number for the SC application.

I also found uppers were seperate from lower gaskets. When given the choice of first design vs second on lower intake gaskets I had Advance get both (I'm able to send back special order...most can't) The second design came in first and I dug in.. they were a match and fit great.

Tips and tricks. If you change the hoses like I did figuring they are old and the coolant is drained, buy the tool you see in my thread. Part number for Sears is in there as well.

When gasket scraping.. go through 20 or so razor blades in your 1.99 Napa/Adavance scraper.. a fresh blade works like a champ. Soon as you notice you are working at it..change it.

Hank from RI gave me a great tip on fuel injector removal.. spray the base of each injector with silicone spray lubricant..then wiggle and pull they pop right out. Reinstall with a little vasoline on the rubber rings.

Have vacuum hose on hand.. you will find at least one that's dry and cracked.

Other than that..I think having your bc manual in hand buddies on speed dial helps as well.

Thanks for the numbers......

I called around today and found that the dealer was the cheapest in gasket prices so I bought them all and also the Coolant Elbow from the local dealer today. I also bought a package of new O rings for the injectors just incase I would need them and I am sure I will.

Bill,
thanks for the link, it helped.
Where will I run into scraping of gaskets that I will go through that many blades, I was hoping all I need is a good putty knife?
Thanks for the tip on the silicone spray lubricant and a little vasoline.
What sizes of vacuum hoses should I get?

Very good thinking. I should have suggested that before, too. I changed my o-rings both times when I replaced the upper intake manifold. I dipped them in a little oil to help them slide easier.

I bought some, but ended up not using them at all... my old ones were in perfect shape. go figure.

Anyhew, I used gasoline as my lubricant to get the o-rings back into the mani, but oil works well too...

The Dorman and or Motormite( Same intake ) will come with the upper gaskets in the box, as well as a new PCV Valve, and new top for the PCV valve.... You may need to reuse the O rings for the lid and PCV valve... But it should come with all of the upper gaskets ;)

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I decided to get a modified UIM from Bob Dillon, that is why I had the need for UIM gasket numbers.....

Depending on how they got shuffled around, you may have ended up with my original upper of my 99! ;)

The number of razor blades will vary. I gently scraped the surface of the heads to remove any excess gunk. To clean the surface of oil and coolant a rag and brake clean works wonders.

Wh ere do these stove pipes get installed? Are they for the egr? I am replacing an engine and want to do the intake manifold gaskets before the install. I got an engine from an 97 GP and do not want to wipe out another engine.. I know I need the upper and lower gaasket, coolant elbow. 180 T stat. I have to check out the intake manifod on the new engine and I will check the one on the old one to see which one is in better shape.. Is there anyway to shield the intake so it does not get brittle? Or is that where the stove pipe comes in??

Can you please copy your question and start a new thread? The information in this thread is 18 months old and will mislead people. Please start by reading this Techinfo article: http://www.bonnevilleclub.com/forum/...e=article&k=38 I'll be happy to answer your questions in the new thread.