2008 Toyota tundra 4.7L Complete Torque Specs List
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Toyota Tundra 4.7L Engine Repair Information
Here you can find information regarding the assembly of the Toyota 4.7L engine. In this guide we willstart from the inside of the engine including thecrankshaft, connecting rods, and piston ring installation and then move outwards all the way to the pulley beltsystem. Along the way correct procedures and torque specswill be given to aid in the assembly of the engine. Feel free to start from the beggining and work your wayoutwards or skip ahead to your current position in the engine for what you may need.
Crankshaft Main Caps Installation
The 4.7L engine block main bearing caps should be inspected for any defects or flaws before installation.Be sure to lubricate the bearing surfaces prior to installation. Once prepared you can place the caps onto the crankshaftand begin tightening the bolts down in a multi stage process. The first being 10 ft-lbs starting from the middle and going outwards.The second time around you can go to 20 ft-lbs and then for the third time you do an additional 90 degree turn for each bolt.Once finished you should be good to continue with the rest of the engine.
Toyota Tundra 4.7L Main Cap Torque Specs : 20 ft-lbs + 90°
Piston and Connecting Rod Installation
To install the pistons and connecting rods you must first install the piston rings into each piston. Be carefulnot to stretch the rings or break them during installation. Make sure to put the correct rings in the correctpositions, this can be determined by looking atthe instructions given with the new rings. Each ring manufacturer is different so be sure to check for yourspecific rings. Once the rings have been installed you can now fit the connecting rod bearings into the end capsand lube them up with oil or lithium grease. The piston can now be lowered into the cylinder, make sure the dotor mark is facing the front of the engine and that you don't scratch the cylinder.Once installed you can match the connecting rod caps with the correct rods and start to torque the connectingrod bolts to 18 ft-lbs and then an additional 90 degree turn for each bolt. After all are done rotate the crankto ensure all pistons move smoothly in and out of their cylinders and nothing binds.
Toyota Tundra 4.7L Connecting Rod Torque Specs : 18 ft-lbs + 90°
Oil Pump Installation
When installing the oil pump be sure to use the proper sealant around the pump base if neccessary to ensure that oil pressuredoesn't drop due to leakage. After preparing the contact surfaces carefullyinstall the oil pump mechanics onto the crankshaft by aligning the crankshaft end with the hole on the center of the pump gear. Onceinstalled you can then place the oil pump onto the engine block and tighten down the A bolts to 15 ft-lbs and the B bolts to 31 ft-lbs. The maindifference between the type of bolts are how long they are and what material they tighten down into. The oil pump cover can then be installedonto the oil pump using a series of philips screws that tighten down to 8 ft-lbs. The oil pickup tube on this engine then bolts upto the bottom of the engine block through the use of 2 nuts. These nuts can be tightened down to 10 ft-lbs.
Toyota Tundra 4.7L Oil Pump Torque Specs : 12 ft-lbs
Toyota Tundra 4.7L Oil Pump Torque Specs (14mm): 23 ft-lbs
Toyota Tundra 4.7L Oil Pump Cover Torque Spec: 7 ft-lbs
Toyota Tundra 4.7L Oil Pickup Tube Torque Specs : 7 ft-lbs
Cylinder Head Installation
The first thing you must do when installing cylinder heads is to ensure both the block and head surfaces arecompletely clean from dust, oil, and any debris. The next thing you must to isto set the camshafts to their correct positions to prevent any valves from hitting pistons during installationand torquing of the head bolts. Much the same you have to set the pistons to their correctlocations, typically this means putting the #1 piston to TDC or Top Dead Center. Once everything is ready youcan install the head gasket onto the engine block by aligning the alignment dowels.Something I usually do is spray down the head gasket with some engine copper spray from permatex which you canfind here, this ensures that any gaps that could be present between the 2 surfaces gets filled with thespray. Italso helps to transfer heat between the 2 metals. With the gasket in place you can set the cylinder head ontothe gasket and block, if needed have someone assist with this process as the head can be heavyand you don't want to scratch anything or drop it! Once the head has been placed you will want to startinstalling the head bolts to make sure it doesn't move. Be sure to buy new head bolts as many manufacturersuse TTY or Torque to Yield head bolts meaning they stretch during torqueing and cannot be used twice. Also makesure to lubricate the bolts in clean engine oil before installing them into the head.Once all the head bolts have been installed and finger tightened you can start the torqueing process, almost allhead bolts have a multi-step process for torqueing. The 4.7L starts off with 25 ft-lbs andthen requires you to back them off a full turn. Then you must again torque them to24 ft-lbs and then a 90 degree turn and finally add another 90 degrees by going through each bolt with each step.After torquing the heads are completely installed and you can now move to intalling the timing.
Toyota Tundra 4.7L Cylinder Head Torque Specs : 24 ft-lbs + 90° + 90°
Timing Belt and Tensioner Installation
On the Toyota 4.7 engine the timing system is ran by the use of a timing belt. This belt system consists of asprocket on a single camshaft per head, 2 tensioner pulleys, a crankshaft pulley, and an idler pulley between the heads.Before installing the belt itself make sure all of the components are tight and torqued properly.The camshaft timing tube sprockets get tightened to 58 ft-lbs, the tensioner with the engine block behind it gets tightened down to 12 ft-lbs while theone over the oil pump gets tightened down to 19 ft-lbs. The Idler pulley in the center between the heads gets tightened down to 26 ft-lbs.The timing camshaft chain system that is isolated within the heads has a chain that runs from one camshaft to the other. The chains tensioner getstightened down to 17 ft-lbs while the chains guides get tightened down to 15 ft-lbs. The chains should be installed using the timing marks onthe chain and sprockets. New chains come with imagery for this installation. The camshafts are held down to thecylinder head by camshaft bearing caps which should be tightened to 12 ft-lbs and 6 ft-lbs for the bolts directly over the timing tubes.The crankshaft timing sprocket merely gets placed onto the shaft andaligned using a woodruf key. With the sprockets all in place and the number 1 cylinder in TDC or top dead center you can then install the timing beltbeing sure to align the timing marks as shown in the picture.Finally the crankshaft position sensor can be placed into its location and tightened down to 8 ft-lbs and the timing belt cover can be set into place andtorqued down to 8 ft-lbs.
Toyota Tundra Camshaft Sprocket Torque Spec: 58 ft-lbs
Toyota Tundra Crankshaft Position Sensor Torque Spec: 8 ft-lbs
Toyota Tundra Camshaft Bearing Caps Torque Spec : 12 ft-lbs
Toyota Tundra Timing Belt Tensioner Torque Spec (Pump side): 19 ft-lbs
Toyota Tundra Timing Belt Tensioner Torque Spec (Block side): 12 ft-lbs
Toyota Tundra Timing Belt Idler Pulley Torque Spec : 26 ft-lbs
Toyota Tundra Timing Chain Tensioners Torque Spec : 17 ft-lbs
Toyota Tundra Timing Chain Guides Torque Spec : 15 ft-lbs
Toyota Tundra Timing Belt Cover Torque Spec : 8 ft-lbs
Timing Cover Installation
The timing cover on the 4.7L is used to cover up the timing belt and the pulleys that it goes on. Since this cover simply justprotects the belt from debris you will not need any silicon during installation. The timing belt cover bolts should be torqued downto about 8 ft-lbs during installation.
Toyota Tundra Timing Cover Torque Specs : 8 ft-lbs
Oil Pan Installation
On the 4.7L the oil pan plays an important role in keeping the engine oil inside theengine. For this reason I recommend using a new gasket as well as some silicone sealantduring installation. Using the same technique as before with the cover you clean the surfaces of both the oilpan and the engine block and then install the new gasket onto the block and then followit up with some silicone sealant. Be sure to follow your sealants instructions to ensure you get the best sealfrom your application. On the 4.7L there is an upper and lower oil pan. On the upper pan there are 2 different sizes ofoil pan bolts being 10mm and 12mm bolt heads. The 10mm bolts get tightened downto 7 ft-lbs while the 12mm ones get tightened down to 21 ft-lbs. On the lower oil pan the bolts get tightened down to 7 ft-lbs.Along with the pan is the oil pan drain plug, this gets removed and reinstalled quite frequently and can betorqued down to 27 ft-lbs.
Toyota Tundra Upper Oil Pan Torque Specs (10mm): 7 ft-lbs
Toyota Tundra Upper Oil Pan Torque Specs (12mm): 21 ft-lbs
Toyota Tundra Lower Oil Pan Torque Specs : 7 ft-lbs
Toyota Tundra Oil Drain Plug Torque Specs : 27 ft-lbs
Valve Covers Installation
The valve cover installation is rather simple, there are rubber seals for each bolt hole and a silicone gasketthat prevents oil from leaking out of the engine. It is recommended to replace both the sealsand the gaskets although if they are in good condition you can reuse them. If you do choose to reuse them Iwould use some silicone sealant along with the silicon gasket to ensure it does not leak.The valve cover bolts torque down to 106 in-lbs or about 9 ft-lbs in a criss cross order. Be sure not to missany bolts to avoid having oil leak out onto the exhaust pipes and cause a lot of smoking.
Toyota Tundra Valve Cover Torque Specs : 9 ft-lbs
Intake Manifold and Fuel Rail Installation
When installing the intake manifold you want to make sure you have all the surfaces as well as intake holescleaned out before placing the manifold into position. Once cleaned you can then placethe intake manifold gaskets onto the alignment pins. If you want you can also use a little bit of sealant on thegaskets to help ensure there are no leaks. With the gaskets in place you can now putthe manifold down onto the gaskets and begin to install the bolts. The intake manifold bolts torque to 13 ft-lbsand can be tightened starting from the inside and going outwards. The COPs or the coilsfor the spark plugs get torqued down to 60 in-lbs or about 5 ft-lbs and the spark plugs themselves can betorqued down to 13 ft-lbs, be careful not to overtorque these as they can snap and cause big problems.When installing the fuel rail make sure that all the fuel injectors are in good condition and that all theo-rings are in place andare in good condition. If everything is good you can place the fuel rail into position and push the injectorsinto their holes and start to torque the rail bolts to 90 in-lbs or about 8 ft-lbs. The fuel inlet pipe can be tightened down to22 ft-lbs.
Toyota Tundra Intake Manifold Torque Specs : 13 ft-lbs
Toyota Tundra Ignition Coil Torque Specs : 5 ft-lbs
Toyota Tundra Spark Plug Torque Specs : 13 ft-lbs
Toyota Tundra Fuel Rail Torque Specs : 8 ft-lbs
Toyota Tundra Fuel Inlet Pipe Torque Specs : 22 ft-lbs
Exhaust Manifold Installation
The exhaust manifold can be installed by cleaning the surface areas on both the head an the manifold itself andthen by using the exhaust manifold gasket and putting it in place. Once the gasket is in itslocation you can put the manifold onto the heads and begin to torque the nuts down to 32 ft-lbs. I always use somecopper spray from permatex on the exhaust manifold gaskets to ensure I do not end up withany exhaust leaks once done. When you go to install the engine into the vehicle or if it is already in thevehicle the torque specs for the exhaust manifold to the exhaust pipes or catalytic converter is 35 ft-lbs.The EGR system consists of a series of pipes that range from the manifold to the head. All of the EGR pipes can be tightened downto 14 ft-lbs.
Toyota Tundra Exhaust Manifold Torque Spec : 32 ft-lbs
Toyota Tundra Exhaust Pipe Torque Specs : 35 ft-lbs
Toyota Tundra EGR Pipe Torque Specs : 14 ft-lbs
Water Pump and Thermostat Installation
The water pump on the Toyota 4.7L engine should be installed by usinga new gasket and if desired some silicon sealant to help prevent leaks. Be sure to clean both metal surfaces prior to installing the pump. Onceprepared the pump can be moved into placed and the bolts should be torqued to 14 ft-lbs.The water pump pulley can be torqued to the water pump itself with 14 ft-lbs.
Toyota Tundra Water Pump Torque Specs : 14 ft-lbs
Toyota Tundra Water Pump Pulley Torque Specs : 14 ft-lbs
Front Dress and Pulley belt Installation
Most of what is left on the engine is just place and tighten objects such as the belt pulleys, belt tensioner,throttle body, oil filter neck, crankshaft pulley, and motor mounts. If the items have a gasket and hold eitheroil or coolant inside the engine then feel free to add some sealant along with the gasket. Always be sure toinspect your gaskets and replace them if there is any deteriation or flaws with them. For thebelt system the crankshaft pulley gets torqued to 181 ft-lbs. The belttensioner can be tightened to 26 ft-lbs and the idler pulley can be torqued down to 26 ft-lbs as well. When installing be sure theyboth turn smoothly and if they do not then replace them with new ones as the bearings can go bad. The enginemotor mount can be installed onto the engine block if it hasn't been already, the torques forthe mount to the block is 59 ft-lbs and then when installing the mount to the vehicle or frame it can be torqued to35 ft-lbs. Finally the throttle body can be installed on top of the intake manifoldwith a good gasket and some added sealant using 7 ft-lbs in a criss cross pattern. For installing the belt youcan use a tool to move the tensioner into its springed state and install the belt as shown in thepicture. The power steering pump pulley should be tightened down to 14 ft-lbs.
Toyota Tundra Crankshaft Pulley Torque Specs : 181 ft-lbs
Toyota Tundra Idler Pulley Bolt Torque Spec : 26 ft-lbs
Toyota Tundra Belt Tensioner Torque Specs : 26 ft-lbs
Toyota Tundra Motor Mount to Engine Torque Specs : 59 ft-lbs
Toyota Tundra Motor Mount to Frame Torque Specs : 35 ft-lbs
Toyota Tundra Power Steering to Head Torque Specs : 14 ft-lbs
Toyota Tundra Power Steering to Bracket Torque Specs : 30 ft-lbs
|Timing Torque Specs|
|Timing Belt Cover Torque spec||8 ft-lbs|
|Timing Belt Tensioner Torque spec (Pump Side)||19 ft-lbs|
|Timing Belt Tensioner Torque spec (Block Side)||12 ft-lbs|
|Camshaft Sprocket Bolts Torque spec||58 ft-lbs|
|Crankshaft Postition Sensor Torque spec||8 ft-lbs|
|Camshaft Bearing Caps Torque spec||12 ft-lbs|
|Timing Belt Idler Pulley Torque spec||26 ft-lbs|
|Cam Timing Chains Tensioners Torque spec||17 ft-lbs|
|Cam Timing Chain Guides Torque spec||15 ft-lbs|
|Cylinder Head Torque Specs|
|Cylinder Head Torque Specs||24 ft-lbs + 90° + 90°|
|Valve Cover Torque specs||9 ft-lbs|
|Exhaust Manifold Torque specs||32 ft-lbs|
|Exhaust Manifold to Pipe Torque||35 ft-lbs|
|Exhaust EGR Pipe Torque Spec||14 ft-lbs|
|Bottom End Torque's|
|Main Cap Bolts Torque Spec||20 ft-lbs + 90°|
|Connecting Rod Bolts Torque Spec||18 ft-lbs + 90°|
|Oil Pump Torque Specs||12 ft-lbs|
|Oil Pump Torque Specs (12 mm)||23 ft-lbs|
|Oil Pump Cover Torque Specs||7 ft-lbs|
|Oil Pump Pickup Tube Torque Specs||7 ft-lbs|
|Upper Oil Pan Torque Specs (10 mm)||7 ft-lbs|
|Upper Oil Pan Torque Specs (12 mm)||21 ft-lbs|
|Lower Oil Pan Bolts Torque Spec||7 ft-lbs|
|Oil Pan Drain Plug Torques||27 ft-lbs|
|Intake Manifold and Fuel Rail Torque Spec|
|Intake Manifold||13 ft-lbs|
|Fuel Rail Torque Specs||8 ft-lbs|
|Fuel Inlet Pipe Torque Specs||14 ft-lbs|
|COP's (Ignition Coil Packs)||5 ft-lbs|
|Spark Plugs Torque Specs||14 ft-lbs|
|Throttle Body Torque Specs||7 ft-lbs|
|Water Pump & Pulley Torque Specs|
|Water Pump Torque Specs||14 ft-lbs|
|Water Pump Pulley Torque Specs||14 ft-lbs|
|Crankshaft Pulley Torque Spec||181 ft-lbs|
|Belt Tensioner Torque Spec||26 ft-lbs|
|Belt Idler Pulley Torque Spec||26 ft-lbs|
|Motor Mount (Engine Side) Torque||59 ft-lbs|
|Motor Mount (Frame Side) Torque||35 ft-lbs|
|Power Steering to Head Torque Spec||14 ft-lbs|
|Power Steering to Bracket Torque Spec||30 ft-lbs|