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Removing GM Small Block Engine - Gen II...
Removing GM Small Block Engine - Gen III V-8 R&R Basics
Part I: Learn How TO Remove THE Latest Small-Block Engine, THE Gen III Ls1 V-8, From Gm Trucks AND Suvs
May 01, 2005
1.Whenever removing an engine, always disconnect the battery first. Then, loosen the hose clamps at each end of the inlet airtube assembly and the wiring harness clip at the passenger side of the radiator. This allows the removal of the tube that runs between the air cleaner box and the mass airflow (MAF) sensor. Look at the next image for how to remove the clip without destroying it.
1.Whenever removing an engine, always disconnect the battery first. Then, loosen the hose
2.There are many clips on the Gen III engine that are a little tricky to get loose, lsuch as this main wiring harness clip. If you don't already have one, you'll need a radiator hook tool, as this will be your best friend when removing the hose, wiring clips and electrical connectors on the Gen III V-8. In this case, place the tip of a radiator hook tool inside the clip section (take a good look at the location in the photo to understand where), depress the locking tab, and pull the clip open with the other hand.
2.There are many clips on the Gen III engine that are a little tricky to get loose, lsuch
3.The next part to come off is the engine cover, which has already been removed by loosening the 10mm bolts holding it in place. Then, off comes the upper radiator fan shroud after removing the two 10mm hex-head bolts from the upper edge of the shroud and the four pullpins where the upper portion mates to the lower portion of the shroud.
3.The next part to come off is the engine cover, which has already been removed by looseni
4.A good way to remove the radiator shroud pullpins is to lightly clinch under the tab with side cutters (don't cut the tab in half, just use the side cutters to grab under the head and pull up) and pull up. The tab only needs to go up about a 1/2 inch to release the clip. To prevent from losing them or not knowing where everything goes when putting the engine back in, it is recommended you put all the fasteners in Ziplock bags marked with their usage and quantity.
4.A good way to remove the radiator shroud pullpins is to lightly clinch under the tab wit
5.The fan is removed next. This requires a 36mm wrench (Blue Point PN YA9521) be used to twist the 36mm hex-head nut against the cranking rotation of the belt (the belt direction is different on various front drives, so you'll need to determine this for your application). Do not remove the accessory drivebelt before doing this step, as the belt will hold the water pump shaft in place while you loosen the fan nut. You should be able to remove the nut with the wrench, but if not, refer to the next photo for how to remove "stuck" fan nuts. Remove the lower shroud by taking it off its two resting tabs.
5.The fan is removed next. This requires a 36mm wrench (Blue Point PN YA9521) be used to t
6.If the radiator nut is locked in place, an air hammer with a chisel attachment can be used to rattle the nut loose. Place the chisel on the back edge of one of the nut faces and push the nut loose. With the fan removal complete, you should now drain the coolant. To do this, pull the drain tube out of its holder on the side of the radiator (usually located on the lower driver-side area of the radiator) and position it pointing down at a bin to collect the drained coolant. Turn the drain petcock to start the flow of coolant. Don't reuse this coolant and dispose of it properly. Plan on adding fresh DexCool (some mix with water, others run it 100 percent - you decide) when the engine is reinstalled.
6.If the radiator nut is locked in place, an air hammer with a chisel attachment can be us
7.To pull the coolant hoses off the engine, use pliers to compress the spring clamp holding the upper radiator hose on the engine. If possible, compress the clip until it detents open (see inset) to make reinstallation a snap (literally). These hose clamps are staked to the hose, so they won't slide back on the hose. Now, lift the hose to drain the coolant in the hose into the radiator. Use pliers to compress the clips on the lower radiator hose and the two heater hoses and remove. A radiator hook tool might have to be used to pry between the rubber hose and metal fittings to get the hoses loose.
7.To pull the coolant hoses off the engine, use pliers to compress the spring clamp holdin
8.If the engine has a throttle cable, remove it from the throttle body by unlooping the cable off the throttle blade cam and depressing the two tangs on the anchor of the cable housing to pull it out of the bracket. If your truck has an ETC (electronic throttle control), simply unplug it at this time.
8.If the engine has a throttle cable, remove it from the throttle body by unlooping the ca
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