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LQ1 LIM Coolant Leak---again?!

coolant lq miles out

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#1 Galaxie500XL

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Posted 24 June 2010 - 11:38 AM

I've been losing a small amount of coolant the past few days. Before I left for work this morning, got out the flashlight, and began looking for leaks. Sure enough, I found coolant on top of the distributor stub. It's been less than 3,000 miles since I replaced the LIM because of this very thing...the surfaces were so clean, you could have eaten off of them, and I used Fel-Pro gaskets, and very carefully confirmed that the torque applied to the fasteners was done correctly... What could have gone wrong?

galaxie500xl

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#2 spiderw31

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Posted 24 June 2010 - 12:28 PM

I had the exact same issue, and when I took it all apart my gut feeling was that the torque was wrong on the LIM bolts. They just felt too tight as I loosened them, and the gaskets had compressed a bit too much. I think that the setup is just extremely sensitive to imperfections and proper torquing; looks like if the gasket is just a small amount thinner than normal you get issues. Mine's been OK for the last couple thousand miles, and we'll see how long it lasts.
- Jeff W.Posted Image1992 Grand Prix SE 3.4TDC 4T60e, 68,000. Proudly driving daily!1987 Fiero GT 5 Speed project car2005 Chevy Equinox LT (Wifey's Ride)

#3 Night Fury

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Posted 24 June 2010 - 05:04 PM

Well its a good thing they aren't too hard to replace!

-Buck W.

Black Trio!

****1996 Chevrolet Silverado Z71, 4x4 5.7 V8, auto, 198,000 miles****

****1999 Chevrolet Monte Carlo Z34, 3800, auto, ~207,000 miles****

****2005 Saturn Vue, 2.2 Ecotec/5-speed manual, 186,000 miles****

=====+++++=====+++++=====+++++=====+++++=====+++++=====+++++

****1993 Ford Festiva GL, Swapped 1.6 SOHC I4, 5-speed, 204,000****   <----On the chopping block

****1999 Toyota Sienna XLE, 3.0 DOHC V6, auto, 347,000 miles****          <---- On the chopping block

 


#4 jtwmechanic

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Posted 25 June 2010 - 12:23 AM

did you use the steel gaskets? fel-pro offers two different gasket sets. one is steel one is not. steel is the only way to fix it right
[SIGPIC][/SIGPIC]96 cutty L67

#5 spiderw31

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Posted 25 June 2010 - 04:28 AM

did you use the steel gaskets? fel-pro offers two different gasket sets. one is steel one is not. steel is the only way to fix it right

I'm pretty sure there isn't a metal gasket for the LQ1. Not that I saw listed anyways, and looking at the design I'd say it'd be tough to fill that space with a metal gasket.
- Jeff W.Posted Image1992 Grand Prix SE 3.4TDC 4T60e, 68,000. Proudly driving daily!1987 Fiero GT 5 Speed project car2005 Chevy Equinox LT (Wifey's Ride)

#6 Galaxie500XL

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Posted 25 June 2010 - 12:18 PM

I've not seen the steel gaskets anywhere, but this sounds like a good idea. Any idea of P/N, or a place that might stock them? Rockauto only seems to have the black plastic ones, and the same for the local parts stores I've been to.

galaxie500xl

1993 LT1 Corvette Coupe

1988 Camaro IROC-Z 5.7 TPI 5-speed

2015 Chevrolet Equinox LTZ

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ


#7 Crazy K

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Posted 25 June 2010 - 02:56 PM

I've not seen the steel gaskets anywhere, but this sounds like a good idea. Any idea of P/N, or a place that might stock them? Rockauto only seems to have the black plastic ones, and the same for the local parts stores I've been to.

I'd contact Fel-pro directly and ask if they even exist. I have had to use the plastic ones, myself.
Posted ImageBUILDER AND DESTROYER OF FINE(?) AMERICAN CARS.

#8 White93z34

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Posted 25 June 2010 - 03:24 PM

There is no need for steel intake gaskets on the LQ1. I have done, honestly probably 15 plus intake gasket jobs on these things and have yet to have one leak like that, that many of those were before I knew what I was doing and did not use a torque wrench. did you clean the mating surfaces with a die grinder/scotchbrite pad and accidentally take off too much material off the head?

-Chris D. chrissig.jpg 1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284 1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60 Qty:2 2001 Cadillac Seville STS 4.6L DOHC v8 Hydramatic 4T80 1987 Chevrolet Camaro Z28/IROC-Z 5.0L v8, Hydramatic 700R4 2007 Ford Ranger 2.3 i4 Automatic


#9 jtwmechanic

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Posted 25 June 2010 - 03:41 PM

this listing repairs all 3xxx gm engines, part #MS98003T. not sure about the part # for the LQ1

Edited by jtwmechanic, 25 June 2010 - 03:51 PM.

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#10 Galaxie500XL

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Posted 25 June 2010 - 03:58 PM

I cleaned them with a toothbrush, and a brass brush to get the stubborn deposits off. The original machining marks on the surface still show evenly.

galaxie500xl

1993 LT1 Corvette Coupe

1988 Camaro IROC-Z 5.7 TPI 5-speed

2015 Chevrolet Equinox LTZ

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ


#11 White93z34

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Posted 25 June 2010 - 11:08 PM

are you sure its not that dumb rubber O ring that feeds the TB heater? I've had issue with that thing leaking in the past.

-Chris D. chrissig.jpg 1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284 1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60 Qty:2 2001 Cadillac Seville STS 4.6L DOHC v8 Hydramatic 4T80 1987 Chevrolet Camaro Z28/IROC-Z 5.0L v8, Hydramatic 700R4 2007 Ford Ranger 2.3 i4 Automatic


#12 GOT2B GM

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Posted 25 June 2010 - 11:12 PM

a touch of RTV there can't hurt

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#13 Galaxie500XL

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Posted 26 June 2010 - 12:16 AM

I've been thinking about that myself the past couple of days...I was tempted to get some UV dye and put in the coolant, and see if I can find a leak... Then again, maybe that yellow Prestone glows already?

galaxie500xl

1993 LT1 Corvette Coupe

1988 Camaro IROC-Z 5.7 TPI 5-speed

2015 Chevrolet Equinox LTZ

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ


#14 AL

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Posted 26 June 2010 - 04:34 AM

No, it doesnt, add the dye and keep an eye on it

sig_zps6f0c1eb4.jpg 98 Regal GS - 299k, on the race to 300k 15 Silverado LTZ - 4k, BGA express 2.0 03 Grand Prix GT - 108k, Britts DD 16ft car trailer

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#15 Galaxie500XL

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Posted 28 June 2010 - 10:24 AM

I'll get the dye. A friend asked me if I'm using Dex-Cool...I'm not. Is this a possible issue? I've always used Prestone, the yellow stuff, was this engine supposed to use Dex-Cool, and would that make a difference?

galaxie500xl

1993 LT1 Corvette Coupe

1988 Camaro IROC-Z 5.7 TPI 5-speed

2015 Chevrolet Equinox LTZ

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ


#16 Night Fury

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Posted 28 June 2010 - 01:28 PM

Coolant is a non issue!

-Buck W.

Black Trio!

****1996 Chevrolet Silverado Z71, 4x4 5.7 V8, auto, 198,000 miles****

****1999 Chevrolet Monte Carlo Z34, 3800, auto, ~207,000 miles****

****2005 Saturn Vue, 2.2 Ecotec/5-speed manual, 186,000 miles****

=====+++++=====+++++=====+++++=====+++++=====+++++=====+++++

****1993 Ford Festiva GL, Swapped 1.6 SOHC I4, 5-speed, 204,000****   <----On the chopping block

****1999 Toyota Sienna XLE, 3.0 DOHC V6, auto, 347,000 miles****          <---- On the chopping block

 


#17 WhatTheFehl

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Posted 28 June 2010 - 01:49 PM

I know the 3100 in '95 didn't use dexcool, I would assume the LQ1 didn't either, but I'm not sure.
Mike F 2016 Ford Focus ST1 - 30,000 miles, 2.0 EcoBoost I4, 6MT, toy 2003 Toyota Avalon XLS - 389,000 miles, 3.0 DOHC V6 1MZ-FE, daily beater 2004 Subaru Outback - 158,000 miles, 2.5 H4 EJ251, still lives hereFormer Ws:1999 Pontiac Grand Prix GTP - Car of the Quarter 2nd quarter 20131995 Pontiac Grand Prix SE - First car414698.png<p>639530.png

#18 jtwmechanic

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Posted 29 June 2010 - 01:58 AM

I'll get the dye.A friend asked me if I'm using Dex-Cool...I'm not. Is this a possible issue? I've always used Prestone, the yellow stuff, was this engine supposed to use Dex-Cool, and would that make a difference?

the new types of anti-freeze were designed to keep them from rotting out the aluminum cored rads and heater cores when they stopped using copper and brass. i guess over time the old type could cause rotting around the coolant passages of the heads and water pumps since they are all aluminum. as long as it wasn't the old green stuff i would say you were fine and that it was a non issue like Nightfury said.
[SIGPIC][/SIGPIC]96 cutty L67

#19 Night Fury

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Posted 29 June 2010 - 06:50 PM

I know the 3100 in '95 didn't use dexcool, I would assume the LQ1 didn't either, but I'm not sure.

My 95 3100 Ciera had dex TYVM

-Buck W.

Black Trio!

****1996 Chevrolet Silverado Z71, 4x4 5.7 V8, auto, 198,000 miles****

****1999 Chevrolet Monte Carlo Z34, 3800, auto, ~207,000 miles****

****2005 Saturn Vue, 2.2 Ecotec/5-speed manual, 186,000 miles****

=====+++++=====+++++=====+++++=====+++++=====+++++=====+++++

****1993 Ford Festiva GL, Swapped 1.6 SOHC I4, 5-speed, 204,000****   <----On the chopping block

****1999 Toyota Sienna XLE, 3.0 DOHC V6, auto, 347,000 miles****          <---- On the chopping block

 


#20 WhatTheFehl

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Posted 29 June 2010 - 06:54 PM

From the factory? My GP doesn't have dex, I remember someone telling me it wasn't supposed to have it. Plus I don't have one of those little dexcool warning labels.
Mike F 2016 Ford Focus ST1 - 30,000 miles, 2.0 EcoBoost I4, 6MT, toy 2003 Toyota Avalon XLS - 389,000 miles, 3.0 DOHC V6 1MZ-FE, daily beater 2004 Subaru Outback - 158,000 miles, 2.5 H4 EJ251, still lives hereFormer Ws:1999 Pontiac Grand Prix GTP - Car of the Quarter 2nd quarter 20131995 Pontiac Grand Prix SE - First car414698.png<p>639530.png





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