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Oil Cooler Block Off Plate Leak. Gmt900


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#1 Steven08Sierra

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Posted 02 September 2009 - 05:38 PM

Two oil changes ago I noticed some oil on the bottom of my oil pan. I figured it was some oil that ran down the pan when I drained my oil. I cleaned it up and didn't worry about it anymore. On my last oil change the oil was back and there was more this time. I followed it up to the oil cooler block off plate and couldn't tell for sure where it was coming from. I originally thought it was the oil pan gasket. After sticking my camera up and above the oil cooler plate where I couldn't see I found this...

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After finding this I read around and heard about the rack and pinion leak and noticed this...

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I believe this is just the installation lube and there's no fluid driping or coming from the tie rod boot so I'm not too worried about that. I cleaned the area and will keep an eye on it.

Has anybody else had leaks similar to these?

#2 MS3DALE

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Posted 02 September 2009 - 07:04 PM

The oil cooler block off plate was a common issue on the GMT800 trucks.

The steering rack leak is a common issue on the GMT900 trucks,Theres a bulletin out on it.

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'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

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#3 MeanStreak'03

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Posted 02 September 2009 - 09:46 PM

There is a bulletin out for the block off plate too. When the gasket is replaced, the bulletin instructs the technician to apply gm sealant to the sealing area. We replaced 3 of them on a truck before the bulletin came out. the last time, we applied the sealer and had no issues after that.

#4 BowTieDude

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Posted 02 September 2009 - 10:05 PM

There is a bulletin out for the block off plate too. When the gasket is replaced, the bulletin instructs the technician to apply gm sealant to the sealing area. We replaced 3 of them on a truck before the bulletin came out. the last time, we applied the sealer and had no issues after that.



Not to hijack the thread but...

My 2000 is leaking at the block off plate and it's starting to make a mess on the garage floor. Would you happen to know the part number for the gasket? I need to pick one up. Do you think RTV Black would be ok for the sealant?
2000 Chevy Silverado X-Cab Z71 LT 5.3 V8
1997 Chevy Lumina LS 3.1 V6
1996 Chevy Blazer 4x2 4.3 V6
1992 Pontiac Grand Am 3.3 V6

#5 MS3DALE

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Posted 02 September 2009 - 10:08 PM

There is a bulletin out for the block off plate too. When the gasket is replaced, the bulletin instructs the technician to apply gm sealant to the sealing area. We replaced 3 of them on a truck before the bulletin came out. the last time, we applied the sealer and had no issues after that.



Not to hijack the thread but...

My 2000 is leaking at the block off plate and it's starting to make a mess on the garage floor. Would you happen to know the part number for the gasket? I need to pick one up. Do you think RTV Black would be ok for the sealant?


12611384

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'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

My Garage


#6 sgrah230

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Posted 02 September 2009 - 11:10 PM

I have had my block off plate "fixed" three times and the steering box changed once and "fixed" twice.

Today they put in my Third...yes #3...Radio!

Boy would I love a new truck without all of the damn problems I have had... :dunno: The list is long, but I hope it ends this time...please :dunno:


:jester:

Edited by CRF250X, 02 September 2009 - 11:11 PM.

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#7 BowTieDude

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Posted 02 September 2009 - 11:40 PM

12611384


Thanks!
2000 Chevy Silverado X-Cab Z71 LT 5.3 V8
1997 Chevy Lumina LS 3.1 V6
1996 Chevy Blazer 4x2 4.3 V6
1992 Pontiac Grand Am 3.3 V6

#8 brims

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Posted 03 September 2009 - 07:04 PM

Rich, you happen to know the part number for the GMT800 block off?

Anyone know if it will work on a GMT900?

New number for part number 12551595?

Edited by brims, 03 September 2009 - 07:12 PM.

Posted Image
2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
Future mods: 2 low/6 high
Possible mods: rear sway bar, blacked out front and rear bumpers

#9 MS3DALE

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Posted 03 September 2009 - 07:40 PM

Rich, you happen to know the part number for the GMT800 block off?

Anyone know if it will work on a GMT900?

New number for part number 12551595?


Same number...12611384

sig1alternate.png
'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

My Garage


#10 brims

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Posted 03 September 2009 - 08:03 PM

Rich, you happen to know the part number for the GMT800 block off?

Anyone know if it will work on a GMT900?

New number for part number 12551595?


Same number...12611384


Isn't that the gasket?
Posted Image
2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
Future mods: 2 low/6 high
Possible mods: rear sway bar, blacked out front and rear bumpers

#11 MS3DALE

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Posted 03 September 2009 - 08:09 PM

Rich, you happen to know the part number for the GMT800 block off?

Anyone know if it will work on a GMT900?

New number for part number 12551595?


Same number...12611384


Isn't that the gasket?


Oh yeah,sorry,I thought you wanted the gasket,The number for the block-off plate itself is 12577903

sig1alternate.png
'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

My Garage


#12 Steven08Sierra

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Posted 03 September 2009 - 08:12 PM

There is a bulletin out for the block off plate too. When the gasket is replaced, the bulletin instructs the technician to apply gm sealant to the sealing area. We replaced 3 of them on a truck before the bulletin came out. the last time, we applied the sealer and had no issues after that.


Do you have the TSB number for the block off plate leaking?

Thanks,
Steve

#13 brims

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Posted 03 September 2009 - 08:28 PM

Rich, you happen to know the part number for the GMT800 block off?

Anyone know if it will work on a GMT900?

New number for part number 12551595?


Same number...12611384


Isn't that the gasket?


Oh yeah,sorry,I thought you wanted the gasket,The number for the block-off plate itself is 12577903


Awesome, thanks.
Posted Image
2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
Future mods: 2 low/6 high
Possible mods: rear sway bar, blacked out front and rear bumpers

#14 MS3DALE

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Posted 03 September 2009 - 08:31 PM

There is a bulletin out for the block off plate too. When the gasket is replaced, the bulletin instructs the technician to apply gm sealant to the sealing area. We replaced 3 of them on a truck before the bulletin came out. the last time, we applied the sealer and had no issues after that.


Do you have the TSB number for the block off plate leaking?

Thanks,
Steve


I tried to find it in GM-GlobalConnect myself and had no luck :jester:

sig1alternate.png
'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

My Garage


#15 MeanStreak'03

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Posted 04 September 2009 - 06:15 PM

Shoot, sorry guys, this is for the o-ring portion of the oil cooler lines at the block on the Duramax. I know I've seen it listed for the block off plate gasket too, just cannot find it. It might have been a PI also, no treal sure.


#02-06-01-023F: Oil Leak at Oil Cooler to Engine Block Mating Surface (Replace O-rings, Apply Sealant) - (Mar 31, 2008)


Subject: Oil Leak at Oil Cooler to Engine Block Mating Surface (Replace O-rings, Apply Sealant)


Models: 2001-2005 Chevrolet Silverado 2500/3500 Series Pickup Models

2003-2005 Chevrolet Kodiak C4500/5500 Series Models

2001-2005 GMC Sierra 2500/3500 Series Pickup Models

2003-2005 GMC TopKick C4500/5500 Series Models

with 6.6L Duramax™ Diesel Engine (VINs 1, 2 -- RPOs LB7, LLY)




--------------------------------------------------------------------------------

This bulletin is being revised to change the part number and update the Warranty information. Please discard Corporate Bulletin Number 02-06-01-023E (Section 06 -- Engine/Propulsion System).


--------------------------------------------------------------------------------

Condition
Some customers may comment on oil leaks at the engine oil cooler.

Cause
Minor imperfections in the engine block machined surfaces at the oil cooler interface may allow oil seepage past the oil cooler O-rings.

Correction
Inspect for other oil leaks that may be perceived as an oil cooler leak. An oil leak from one of the main bearing cap side bolts may appear to be coming from the oil cooler.
If the oil cooler is leaking oil, remove the oil cooler from the engine. Use care to remove only the five bolts that hold the oil cooler to the engine block. Refer to the Engine Mechanical sub-section in the appropriate Service Manual.

Edited by MeanStreak'03, 04 September 2009 - 06:16 PM.





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