|04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect|
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|12-25-2012, 11:32 AM||eBay Motors #1 (permalink)|
Join Date: Oct 2010
Location: Hattiesburg, Ms
Pressure in cooling system
My 04.5 LLY is running fine, does not overheat, but even if I let it sit overnight and crank it cold, let it run for about a minute then shut it off, I have to slowly crack open the top on the coolant resevoir slowly. It is building enough pressure just from running a minute that I have to take my time taking the cap off to keep it from blowing the top off and blowing out the coolant from the resevoir.
If I drive it and get it up to running temp it will just start forcing it out of the overflow tube onto the ground. What would cause it to build up this much pressure? Cracked head? Blown head gasket? Causing compression to get into the cooling system and build pressure? That is what my 99 Trans Am did. Thats the only thing I can figure. Any help or suggestions are GREATLY appreciated. Thanks. And Merry CHRISTmas.
|12-25-2012, 11:35 AM||eBay Motors #2 (permalink)|
Join Date: Apr 2009
Location: Lancaster, PA
Sounds like your head gasket(s) are blown. I'm sure others will chime in too though. Good time to do studs!!!
DD: 2006 Duramax Diesel Black CCSB: 4" straight pipe: Big Dipper Trans: Banks Ram Air intake: ATP DSP5: BD Manifold: Air Dog II: resonator deleted: all on mod: B5+ every tank
491 HP/ 1018 TQ(Edge Evo Race LVL 7 numbers)
Work Truck: 2008 Freightliner Sprinter 3.0 liter Mercedes Benz Diesel
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|12-25-2012, 12:26 PM||eBay Motors #3 (permalink)|
Join Date: May 2010
2005 2500HD CCSB 4x4 - AFE lbz intake, lbz MP, pcv re-route, egr blocked, 4" DP back straight pipe, 285's on stock aluminums, Insight CTS, bully dog tuner-SOLD
2000 F-350 CCLB 4x4 - CAI, 4" straight pipe, Edge evolution, Isspro gauges, leveled on 35's
1960 F-250 4x4
|12-25-2012, 01:01 PM||eBay Motors #4 (permalink)|
Join Date: Aug 2011
Location: springfield mo
Yup have the same issue it's defiantly the head gaskets.
04 gmc sierra 2500hd lb7/rg/lb/zf6/4x4
Efi live dsp5 switch, snow performance methanol kit,raptor 165 pump,southend 3250 dual disk,k&n intake,4" straight pipe exhaust,billet tie rods,18" motto wheels,275 nittio a/t grapplers ,traction bars,stock turbo,stock tranny,stock cp3 and injectors
|12-25-2012, 01:06 PM||eBay Motors #5 (permalink)|
Join Date: Nov 2012
Location: Norfolk, VA
Join the club, i have pretty much the same problem. will be doing more than a few upgrades while im that deep into the engine
-straight 4" exhaust
-LBZ turbo MP/resonator plug
-4" lift sitting on Toyo open country M/T 35's
"A person who never made a mistake never tried anything new."
|12-25-2012, 01:08 PM||eBay Motors #6 (permalink)|
Join Date: Sep 2010
Location: Saint Johnsville, NY
It sounds like Head Gaskets. It's not uncommon for a LLY to get a blown gasket. It also might be the radiator cap but I doubt it, because it builds pressure so fast. It should only build pressure from the heat.
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|12-25-2012, 03:10 PM||eBay Motors #8 (permalink)|
Join Date: Jun 2008
Location: So. Cal
book time is about 35 hours of labor. Plus parts--gaskets [$200]and new bolts--[$100] most use studs-[$600]. Should also consider replacing the water pump-- if it is original.
Yes, you have a bad head gasket-- Sorry.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry