uim/lim changing help and many questions for the right guru - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-25-2006, 12:06 AM   #21
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so do I need to have the stovepipe machined that comes with the APN kit ? I asked the question in my post but was told I didnt read it,I reread and it says for the 99 you need to machine it to get the correct gap right ? Also if I buy the dillon UIM and buttermores pipe will that have to be machined for my 99 PA ? What will the gap be between the sleeve and the stove pipe on the dillon with the buttermore pipe ?
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Old 12-26-2006, 01:00 AM   #22
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Got the answer, thanks guys
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Old 12-26-2006, 02:02 AM   #23
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From the Techinfo article in the paragraph for the APN UIM

Quote:
To obtain the larger .125 insulating gap in the newer 99+ models, the .750 shoulder of the replacement stovepipe provided in the kit could be machined to .625 to fit the smaller stovepipe bore in the lower intake manifold.
So, yes...that has to be machined down.

Also from the Techinfo article on the Dorman...

Quote:
Dorman markets a replacement UIM kit that includes a reduced diameter stovepipe that will directly replace the 5/8 stock pipe. When the stock .625 stovepipe is replaced with the smaller pipe supplied in the kit, the insulating gap between the hot pipe and the plastic EGR bore is nearly doubled from .065 to .123. The Dorman upper is a good replacement for the original equipment part, and includes a UIM gasket, but the EGR passage is not protected with a sleeve. The Dorman kit is available widely and sells for $129. The reduced diameter stovepipe supplied in the kit must be modified to fit the larger .750 bore in 95-98 engines.
So, no...for your 99 the Dorman stovepipe does not need to be machined down.

From my answer to your post asking questions...

Quote:
The '99 - if you are going to keep that for a while, would be better to change again. All the information on part numbers are listed in the techinfo article. There have been a few part number changes for the LIM, the latest posted here...

http://www.bonnevilleclub.com/forum/...ic.php?t=61639

It also will have two coolant elbows in the tensioner as shown in this diagram..



They are available at the dealer (they may or may not have trouble finding the part number for the second elbow) or Dorman'* help 47065, available at PepBoys and some other parts stores
I'm sorry if pointing out to you that there are two elbows without specifically saying replace both wasn't clear enough, but yes....replace both elbows.

For which gaskets...from the Techinfo article.

Quote:
GM Aluminum Frame Lower Intake Manifold Gaskets. We hope that this newest design will provide the best LIM gasket fix yet. As of March, 2006, these are available at the dealer for $59
Translation...buy that GM aluminum framed lower gasket.

Which is the best upper to buy? From Techinfo...

Quote:
We have recently become aware of a new kit that appears to offer the best off-the-shelf fix for the upper intake manifold. The combination of a metal heat shield to protect the plastic upper and a reduced diameter stovepipe is the best method we can currently recommend to resolve this problem without altering the cooling system. Installed in a 95-98 engine using the reduced diameter pipe supplied with the kit, an insulating gap of .125 is created between the hot pipe and the heat shield. Installed in a 99 or newer engine using the stock GM 5/8 stovepipe, an insulating gap of .065 is created. The kit is marketed mail-order by Automotive Parts Network; it includes a UIM gasket and is priced under $100.
The first sentence says that this is the best off the shelf fix.

Don't want to pay that much? Other good options - also from Techinfo.

Quote:
There are a couple of members on this site that have found other methods of repair that may be useful.

Bob Dillon sleeves upper intakes with 7/8 diameter stainless steel tubing to protect the plastic around the EGR Stovepipe, and also can plug the coolant passages so that coolant does not flow through the failure-prone area of the UIM. Plugging the passages eliminates the possibility of internal engine damage from coolant ingestion from a failed UIM
Quote:
Bill Buttermore has developed inexpensive modifications to add a heat shield around the hot stovepipe in old and new UIMs. He also has described methods for adapting the Dorman stovepipe for 95-98 models, and for repairing failed UIMs.

One of WillWrens answers to your post

Quote:
Originally Posted by willwren
There are only 2 GOOD upper manifolds available. The APN kit and the Dillon intake (available from Bob Dillon on this Forum).
You will have to decided on if you want the best off the shelf fix, or the best that our members have to offer.
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