HomeDashboardFAQSearchRiviera Questions & AnswersWrite-Ups IndexRegisterRelated LinksMemberlistLog in
Share | 
 

 Write-Up: Lower Intake Manifold (LIM) Gaskets

View previous topic View next topic Go down 
Go to page : Previous  1, 2, 3 ... 11, 12, 13
AuthorMessage
KnottyEagle
Member


Name : Daymon
Age : 19
Location : Battle Creek, Michigan
Joined : 2014-08-29
Post Count : 284
Merit : 2

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Sun Nov 23, 2014 9:39 pm

Well, we were able to figure out the LIM gasket ordeal. It made sense the more we looked at it. Like dummies, we bolted down and torqued the LIM bolts without putting the coolant elbow in place. I forgot to clean both openings too. My uncle took a piece of string and tied it around a screw. He fished the screw through the coolant openings and pulled outwards and all of the broken coolant elbow came out in one piece.

Everything else has pretty much been going smoothly. We just need to add coolant, bleed the system, put both belts on, put the intake tube on, and we should be good. Oh wait, forgot about the stupid vacuum hose. When I say we "ghetto rigged" some things, I mean it. As long as they're air tight, I don't care how they look.

I'll also change the oil in auto shop because I can use a lift in there. Makes things a little easier to do.
Back to top Go down
brutusk1
Amateur


Name : Brutusk
Location : Bothell, Washington
Joined : 2011-01-23
Post Count : 59
Merit : 10

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Wed Apr 06, 2016 4:43 pm

I thought I'd put the LIM repair to bed last June but find I'm still burning coolant.

My Blackstone Oil Analysis shows a decrease in Antifreeze contamination from about 0.42 % to 0.24% in the crankcase oil since the repair but the level in the overflow tank slowly goes down.  I'm burning a few ounces a day it seems.  

Was I supposed to use RTV or some other sealant on the LIM gaskets or the "O" rings that seal off the  Throttle Body coolant passage?  I wouldn't think so.

I torqued and re-torqued the LIM and Supercharger bolts to specification, in accordance with the FSM sequence after getting all surfaces scrupulously clean.

Does anyone have an idea why this LIM gasket replacement would continue to leak?

A friend suggests that the head gaskets could be leaking but this doesn't seem likely and I've not heard of that being a problem on these engines.


Last edited by brutusk1 on Fri Apr 08, 2016 8:18 pm; edited 1 time in total
Back to top Go down
Abaddon
Aficionado


Name : Scott
Location : Macomb, Michigan
Joined : 2010-02-24
Post Count : 4146
Merit : 169

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Wed Apr 06, 2016 5:38 pm

Can you smell coolant ever? The reason I ask is that a very small hole in the Radiator would make the Coolant level drop slowly. You'd smell it once the Cooling Fans kicked on. My Radiator has been doing this for about 4 years. It's not touching the ground, so I haven't bothered.
Back to top Go down
brutusk1
Amateur


Name : Brutusk
Location : Bothell, Washington
Joined : 2011-01-23
Post Count : 59
Merit : 10

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Wed Apr 06, 2016 6:32 pm

No, I don't smell coolant, but I do see suspicious puffs of whitish exhaust when the engine hasn't warmed up.

I've been chasing coolant usage for at least a couple of years and replaced the cracked radiator with the radiator hoses, coolant elbow with an aluminum one a couple years ago. The water pump right after I got the car with 98k on it. Those repairs didn't eliminate the coolant usage so then I did the LIM gasket replacement last summer.

I can't continue to ignore the fact that the coolant level consistently goes down so at the last oil change I sent an oil sample to Blackstone for confirmation.

Even if I'm losing a bit of coolant outside the engine, I've still confirmed there's coolant in the oil.

Has anyone found deteriorated head gaskets when they've had the heads off?
Back to top Go down
albertj
Guru


Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 6465
Merit : 121

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Wed Apr 06, 2016 8:43 pm

I am wondering if you have some porosity in the casting of your particular engine block.
Back to top Go down
brutusk1
Amateur


Name : Brutusk
Location : Bothell, Washington
Joined : 2011-01-23
Post Count : 59
Merit : 10

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Thu Apr 07, 2016 12:06 am

Is there a way to test for that?

Does anyone have any other tests to suggest? I'm afraid I'm losing my grip on reality at this point

That, or I'm overlooking the obvious.
Back to top Go down
albertj
Guru


Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 6465
Merit : 121

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Thu Apr 07, 2016 12:31 am

What you **can** do is put stop-leak tablets in the coolant. An old-school gearhead at any GM dealership will confirm that in the era of the Riv, standard procedure for changing coolant in a 3800 was to put stop leak tabs in the radiator. Basically the stuff is ground up walnut shells, ginger root and or some such, but it does work. If you look in the factory manual for the Riviera, you WILL ( I repeat WILL ) find that it says to drop those seal tabs in when you change coolant. In the past GM has issued warnings about NOT using the tabs. If you do a web search (google) "gm 3800 engine coolant leak stop leak tabs" you will find several posts about this, and a GM TechLink note from March 2004 on the topic.
Back to top Go down
brutusk1
Amateur


Name : Brutusk
Location : Bothell, Washington
Joined : 2011-01-23
Post Count : 59
Merit : 10

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Thu Apr 07, 2016 2:12 pm

I think that's (stop-leak tablets) the obvious solution that I've been overlooking.

With the FSM blessing I can stop obsessing over a minor problem and move on to fry bigger fish.

Thanks albertj
Back to top Go down
98riv
Moderator


Location : USA
Joined : 2007-01-14
Post Count : 944
Merit : 30

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Thu Apr 07, 2016 7:04 pm

albertj wrote:
What you **can** do is put stop-leak tablets in the coolant.  An old-school gearhead at any GM dealership will confirm that in the era of the Riv, standard procedure for changing coolant in a 3800 was to put stop leak tabs in the radiator.  Basically the stuff is ground up walnut shells, ginger root and  or some such, but it does work.  If you look in the factory manual for the Riviera, you WILL ( I repeat WILL ) find that it says to drop those seal tabs in when you change coolant. In the past GM has issued warnings about NOT using the tabs.  If you do a web search (google) "gm 3800 engine coolant leak stop leak tabs" you will find several posts about this, and a GM TechLink note from March 2004 on the topic.


Why would it require stop leak tablets?  Were the tolerances to loose, a defect, or something else?

_________________
1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2
Back to top Go down
albertj
Guru


Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 6465
Merit : 121

PostSubject: This answer is tongue-in-cheek and NSFW...   Thu Apr 07, 2016 10:37 pm

98riv wrote:

albertj wrote:
What you **can** do is put stop-leak tablets in the coolant.  An old-school gearhead at any GM dealership will confirm that in the era of the Riv, standard procedure for changing coolant in a 3800 was to put stop leak tabs in the radiator.  Basically the stuff is ground up walnut shells, ginger root and  or some such, but it does work.  If you look in the factory manual for the Riviera, you WILL ( I repeat WILL ) find that it says to drop those seal tabs in when you change coolant. In the past GM has issued warnings about NOT using the tabs.  If you do a web search (google) "gm 3800 engine coolant leak stop leak tabs" you will find several posts about this, and a GM TechLink note from March 2004 on the topic.



Why would it require stop leak tablets?  Were the tolerances to loose, a defect, or something else?

Why? I'll give you 3 guesses and the first does not count

1) elves that get drunk off pink poly-glycol have to get their binge from somewhere - why not your radiator expansion tank?
2) expansion-cooling mismatches between the cast iron block and aluminum head/accessories permit seepage over time
3) minor porosity in the water-cooled castings
4) because the plastic engine gaskets leak little sprays of coolant under heat and pressure
5) because the trade-off between quality and reliability versus marginal costs gets made by folks who have developed some skill in having others take the fall when they get it wrong
6) stop-leak-seal-tabs are cheaper than the metal they substitute for and last for the relevant warranty period

Which of the alternative answers above do you like best? twisted

Back to top Go down
Abaddon
Aficionado


Name : Scott
Location : Macomb, Michigan
Joined : 2010-02-24
Post Count : 4146
Merit : 169

PostSubject: Re: Write-Up: Lower Intake Manifold (LIM) Gaskets   Fri Apr 08, 2016 9:25 am

GM puts those tabs, or a form of, in every single car when it rolls off the assembly line.....it's probably not even a GM thing. They probably all do it.

Why tear engines apart to find a pin-hole when you can just seal it up with magic beans?
Back to top Go down
 
Write-Up: Lower Intake Manifold (LIM) Gaskets
View previous topic View next topic Back to top 
Page 13 of 13Go to page : Previous  1, 2, 3 ... 11, 12, 13
 Similar topics
-
» Write-Up: Lower Intake Manifold (LIM) Gaskets
» Write-Up: Lower Intake Manifold change on a '95
» New mods.. Gen V, Gen V lower intake manifold, N* TB
» 948 Custom LS1 intake manifold blocking plate
» want Stock 4ac intake manifold

Permissions in this forum:You cannot reply to topics in this forum
Riviera Performance ::   Supercharged 3800 Tech :: Series II Engine & Transmission-
Jump to: