The balancer timing guides can all be torqued down to 8 ft-lbs along with the chain tensioner. The balancer shaft retaining bolts can be torqued down toĨ ft-lbs.
2008 CHEVY COBALT THERMOSTAT INSTALL
When installing new partsīe sure to install all sprockets before installing the guides and torqueing them down. Simply just loosen up the chain guides and the balancer shaft sprockets and retaining bolts in order to pull them out. When removing the old chain and components This timing chain system is rather large as shown in the picture and uses multiple timing chain guides. On the Chevy 2.4 DOHC engine the balancer shaft timing system is directly behind the engines timing chain and also runs the water pump. The longerīolts get tightened down to 22 ft-lbs and then a 155 degree turn.īe sure to tighten the right bolts to the right specs as this is a critical component of the engines functionality.Ĭhevy Cobalt 2.4L DOHC Cylinder Head Torque Specs (Short): 26 ft-lbs Chevy Cobalt 2.4L DOHC Cylinder Head Torque Specs (Long): 22 ft-lbs + 155° If one bolt is higher up than the others it is in the wrong hole. Them into the holes they should all start out at around the same height. If you are not sure where each bolt goes when you drop The longīolts go in the center of the cylinder head where the oil can access. The shorter bolts go on the outer side of the cylinder head and get tightened down to 26 ft-lbs. The 2.4L DOHC engine uses 2 different sized head bolts being longer ones and Head bolts have a multi-step process for torqueing. Once all the head bolts have been installed and finger tightened you can start the torqueing process, almost all Any hole that does this should be installed with some silicon sealant.Ī little goes a long way in this step and you can check holes by shining a flashlight down them and looking in the water jackets. On Chevy DOHC engines there is occasionallyīolt holes on the engine block that cross into water passages. Sure to lubricate the bolts in clean engine oil before installing them into the head. Use TTY or Torque to Yield head bolts meaning they stretch during torqueing and cannot be used twice. Be sure to buy new head bolts as many manufacturers Installing the head bolts to make sure it doesn't move. The gasket and block, if needed have someone assist with this process as the head can be heavyĪnd you don't want to scratch anything or drop it! Once the head has been placed you will want to start With the gasket in place you can set the cylinder head onto Something I usually do is spray down the head gasket with some engine copper spray from permatex which you canįind here, this ensures that any gaps that could be present between the 2 surfaces gets filled with theĪlso helps to transfer heat between the 2 metals. Once everything is ready youĬan install the head gasket onto the engine block by aligning the alignment dowels.
Locations, typically this means putting the #1 piston to TDC or Top Dead Center. Much the same you have to set the pistons to their correct
To set the camshafts to their correct positions to prevent any valves from hitting pistons during installationĪnd torquing of the head bolts. The first thing you must do when installing cylinder heads is to ensure both the block and head surfaces areĬompletely clean from dust, oil, and any debris.
To ensure all pistons move smoothly in and out of their cylinders and nothing binds.Ĭhevy Cobalt 2.4L DOHC Connecting Rod Torque Specs : 18 ft-lbs + 100° Rod bolts to 10 ft-lbs and then to 18 ft-lbs followed by an additional 100 degree turn for each bolt. Once installed you can match the connecting rod caps with the correct rods and start to torque the connecting Or mark is facing the front of the engine and that you don't scratch the cylinder. The piston can now be lowered into the cylinder, make sure the dot Once the rings have been installed you can now fit the connecting rod bearings into the end capsĪnd lube them up with oil or lithium grease. Each ring manufacturer is different so be sure to check for your The instructions given with the new rings. Positions, this can be determined by looking at Make sure to put the correct rings in the correct Not to stretch the rings or break them during installation. To install the pistons and connecting rods you must first install the piston rings into each piston.
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