2014 - 2018 Chevy Silverado 1500 4.3L Torque Specs

2018 Chevy Silverado 1500 4.3L Complete Torque Specs List

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Timing Torque Specs
Timing Cover Torque spec 10 ft-lbs
Camshaft Timing Sprocket Torque Specs 21 ft-lbs
Camshaft Retaining Plate Bolts Torque spec 8 ft-lbs
Crankshaft Postition Sensor Torque spec 10 ft-lbs
Cylinder Head Torque Specs
Cylinder Head Torque Specs (Shortest) 22 ft-lbs + 55°
Cylinder Head Torque Specs (Medium) 22 ft-lbs + 65°
Cylinder Head Torque Specs (Longest) 22 ft-lbs + 75°
Rocker Arm Torque specs 20 ft-lbs
Valve Lifter Retainer Torque specs 12 ft-lbs
Valve Cover Torque specs 8 ft-lbs
Exhaust Manifold Torque specs 25 ft-lbs
Exhaust Manifold to Pipe Torque 20 ft-lbs

Bottom End Torque's
Main Cap Bolts Torque Spec 15 ft-lbs + 75°
Connecting Rod Bolts Torque Spec 20 ft-lbs + 70°
Oil Pump Bolt Torque Spec 65 ft-lbs
Oil Pan Torque Specs 15 ft-lbs
Oil Pan Drain Plug Torques 15 ft-lbs
Intake Manifold and Fuel Rail Torque Spec
Intake Manifold 15 ft-lbs
Fuel Rail Torque Specs 8 ft-lbs
Spark Plugs Torque Specs 11 ft-lbs
Throttle Body Torque Specs 12 ft-lbs
Distributor Holder Bolt Torque Spec 15 ft-lbs
Water Pump & Pulley Torque Specs
Water Pump Torque Specs 35 ft-lbs
Water Pump Pulley Torque Specs 17 ft-lbs
Crankshaft Pulley Torque Spec 70 ft-lbs
Belt Tensioner Torque Spec 18 ft-lbs
Belt Idler Pulley Torque Spec 30 ft-lbs
Motor Mount (Engine Side) Torque 59 ft-lbs
Motor Mount (Frame Side) Torque 35 ft-lbs

Chevy Silverado 1500 4.3L OHV Repair Information

Chevy Silverado 1500 4.3L OHV Engine Repair Information

Here you can find information regarding the assembly of the Chevy 4.3L OHV engine. In this guide we will start from the inside of the engine including the crankshaft, connecting rods, and piston ring installation and then move outwards all the way to the pulley belt system. Along the way correct procedures and torque specs will be given to aid in the assembly of the engine. Feel free to start from the beggining and work your way outwards or skip ahead to your current position in the engine for what you may need.

Crankshaft Main Caps Installation

The 4.3L 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 crankshaft and 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 15 ft-lbs and then for the third time you do an additional 75 degree turn for each bolt. Once finished you should be good to continue with the rest of the engine.

Chevy Silverado 1500 4.3L OHV Main Cap Torque Specs : 15 ft-lbs + 75°

 

Piston and Connecting Rod Installation

To install the pistons and connecting rods you must first install the piston rings into each piston. Be careful not to stretch the rings or break them during installation. Make sure to put the correct rings in the correct positions, this can be determined by looking at the instructions given with the new rings. Each ring manufacturer is different so be sure to check for your specific rings. Once the rings have been installed you can now fit the connecting rod bearings into the end caps and lube them up with oil or lithium grease. The piston can now be lowered into the cylinder, make sure the dot or 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 connecting rod bolts to 20 ft-lbs and then an additional 70 degree turn for each bolt. After all are done rotate the crank to ensure all pistons move smoothly in and out of their cylinders and nothing binds.

Chevy Silverado 1500 4.3L OHV Connecting Rod Torque Specs : 20 ft-lbs + 70°

 

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 pressure doesn't drop due to leakage. Both surfaces should be cleaned and preped prior to installing. After preparing the contact surfaces carefully install the oil pump onto the bottom of the engine block right onto the rear most main cap. There should be two pins which hold the pump in place so that it does not shift during installation. When placing the pump onto the engine be sure that you have the pumps drive shaft held in place and that both sides are well connected. It should easily slide into the holes without much force. If everything is good you should be able to place the pump and shaft into place and then hand tighten the single pump bolt. Once hand tighten be sure that the pump functions when the shaft turns. The single oil pump bolt can be tightened down to 65 ft-lbs. The oil pump pickup tube gets installed onto the pump directly and simply presses into place. Be sure to have the pickup at the proper angle for you oil pan. Having this wrong will cause the pan to hit the pickup or the pickup to not access enough oil. The angle should be about 15 degrees from the engine block flat surface. I personally will spot weld the pickup tube onto the pump so that it does not shift. However this step is not neccessary.

Chevy Silverado 1500 4.3L OHV Oil Pump Torque Spec : 65 ft-lbs

 

Cylinder Head Installation

The first thing you must do when installing cylinder heads is to ensure both the block and head surfaces are completely clean from dust, oil, and any debris. The next thing you must to is to set the camshafts to their correct positions to prevent any valves from hitting pistons during installation and torquing of the head bolts. Much the same you have to set the pistons to their correct locations, typically this means putting the #1 piston to TDC or Top Dead Center. Once everything is ready you can 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 can find here, this ensures that any gaps that could be present between the 2 surfaces gets filled with the spray. It also helps to transfer heat between the 2 metals. With the gasket in place you can set the cylinder head onto the gasket and block, if needed have someone assist with this process as the head can be heavy and you don't want to scratch anything or drop it! Once the head has been placed you will want to start installing the head bolts to make sure it doesn't move. Be sure to buy new head bolts as many manufacturers use TTY or Torque to Yield head bolts meaning they stretch during torqueing and cannot be used twice. Also make sure to lubricate the bolts in clean engine oil before installing them into the head. On Chevy OHV engines there is occasionally bolt holes on the engine block that cross into water passages. Any hole that does this should be installed with some silicon sealant. A 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. Once all the head bolts have been installed and finger tightened you can start the torqueing process, almost all head bolts have a multi-step process for torqueing. The 4.3L OHV engine uses 3 different sized head bolts being 5 long ones 2 medium sized ones and 6 short ones. The shorter bolts go on the outer side of the cylinder head and get tightened down to 22 ft-lbs and then a 55 degree turn. The long and medium sized bolts go in the center of the cylinder head where the oil can access. The medium ones go on the outer edges of the head. If you are not sure when you drop the bolts into the holes they should all start out at around the same height. If one bolt is higher up than the others it is in the wrong hole. The longer bolts get tightened down to 22 ft-lbs and then a 75 degree turn. The medium sized bolts get tightened down to 22 ft-lbs and then a 65 degree turn. Be sure to tighten the right bolts to the right specs as this is a critical component of the engines functionality.

Chevy Silverado 1500 4.3L OHV Cylinder Head Torque Specs (Shortest): 22 ft-lbs + 55°
Chevy Silverado 1500 4.3L OHV Cylinder Head Torque Specs (Medium): 22 ft-lbs + 65°
Chevy Silverado 1500 4.3L OHV Cylinder Head Torque Specs (Longest): 22 ft-lbs + 75°

 

Timing Chain and Camshaft Installation

On the Chevy 4.3 OHV engine the timing system is ran by the use of a chain. This chain system consists of a sprocket on the single center located camshaft and one sprocket on the engines crankshaft. Since the camshaft is located in the center of the engine it needs to be installed from the front side of the engine. The camshaft bearings get installed using a special cam bearing installation tool. The tool simply presses the bearings in and out of the bearing holes using different sized plates to press on them. Be sure that all of your camshaft bearings are in good condition prior to installing the camshaft and building the engine as this is a critical part of the engine. If all bearings are good and in place the camshaft can be lubed and placed into the engine. It should slide into the bearings with ease, if it gets caught do not force it as you risk damaging the bearings. Simply move the camshaft end around until it slides in. Once all the way into the engine you will need to install the camshaft retaining plate and its bolts. Depending on your specific chevy engine the camshaft retaining plate gets installed impediately after the camshaft is slide into place or after the timing gear has been installed. Depening on how you took apart your engine and the new parts you are installing you will need to adapt accordingly. The retaining plate bolts need to be tightened down to 8 ft-lbs. The camshaft timing sprockets simply slide onto both the crankshaft and the camshaft end. Be sure that you install the system all together with the timing chain marks lined up with the dots on both sprockets. Since there are no tensioners for this system it will only go together like this. On the camshaft side it aligns using a dowel pin that sticks out of the camshaft. There are 3 bolts which hold the camshaft sprocket onto the camshaft. These bolts need to be tightened down to 21 ft-lbs. The crankshaft pulley will hold the crankshaft sprocket into place so no need to tighten any bolts down there.

Chevy Silverado 1500 Camshaft Sprocket Torque Spec: 21 ft-lbs

Chevy Silverado 1500 Crankshaft Position Sensor Torque Spec: 8 ft-lbs

Chevy Silverado 1500 Camshaft Retaining Plate Bolts Torque Spec : 8 ft-lbs

Chevy Silverado 1500 Rocker Arms Torque Spec : 20 ft-lbs

Chevy Silverado 1500 Valve Lifter Retainer Torque Spec : 12 ft-lbs

 

Timing Cover Installation

The timing cover on the 4.3L is used to cover up the internals of the engine and hold in massive amounts of oil. For this reason I recommend using some silicon sealant along with a new gasket during installation. Be sure to clean all of the metal surfaces prior to installation and placing the silicon onto the metal. With everything ready to install be sure to double check your timing and engine internals before placing the cover in place. Another tip is to lube up the crankshaft seal with some oil so it seats better. If everything is good to go then place the cover onto the engine block and begin to tighten down the bolts hand tight. Once all of the bolts have been set in place be sure to follow your sealants instructions by waiting the recommended time. Once ready the timing cover bolts can be tightened down to 10 ft-lbs. Be sure to not overtighten these bolts as it can be easy to do so.

Chevy Silverado 1500 Timing Cover Torque Specs : 10 ft-lbs

 

Oil Pan Installation

Much like the timing cover on the 4.3L the oil pan plays an important role in keeping the engine oil inside the engine. For this reason I recommend using a new gasket as well as some silicone sealant during installation. Using the same technique as before with the cover you clean the surfaces of both the oil pan and the engine block and then install the new gasket onto the block and then follow it up with some silicone sealant. Be sure to follow your sealants instructions to ensure you get the best seal from your application. The oil pan bolts torque to 15 ft-lbs in a cross pattern design. Along with the pan is the oil pan drain plug, this gets removed and reinstalled quite frequently and can be torqued down to 15 ft-lbs.

Chevy Silverado 1500 Oil Pan Torque Specs : 15 ft-lbs

Chevy Silverado 1500 Oil Drain Plug Torque Specs : 15 ft-lbs

 

Valve Covers Installation

The valve cover installation is rather simple, there are rubber seals for each bolt hole and a silicone gasket that prevents oil from leaking out of the engine. It is recommended to replace both the seals and the gaskets although if they are in good condition you can reuse them. If you do choose to reuse them I would 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 8 ft-lbs in a criss cross order. Be sure not to miss any bolts to avoid having oil leak out onto the exhaust pipes and cause a lot of smoking.

Chevy Silverado 1500 Valve Cover Torque Specs : 8 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 holes cleaned out before placing the manifold into position. Once cleaned you can then place the intake manifold gaskets onto the alignment pins. If you want you can also use a little bit of sealant on the gaskets to help ensure there are no leaks. With the gaskets in place you can now put the manifold down onto the gaskets and begin to install the bolts. The intake manifold bolts torque to 15 ft-lbs and can be tightened in a cross pattern. The distributor bolt can be tightened down to 15 ft-lbs and the spark plugs themselves can be torqued down to 11 ft-lbs, be careful not to overtorque these as they can snap and cause big problems. When installing the throttle body make sure that all of the gaskets are in good condition and will hold a seal as you do not want to be leaking gas fumes around the engine. If everything looks good you can tighten the throttle body bolts down to 12 ft-lbs.

Chevy Silverado 1500 Intake Manifold Torque Specs : 15 ft-lbs

Chevy Silverado 1500 Distributor Bolt Torque Specs : 15 ft-lbs

Chevy Silverado 1500 Spark Plug Torque Specs : 11 ft-lbs

Chevy Silverado 1500 Throttle Body Torque Specs : 12 ft-lbs

 

Exhaust Manifold Installation

The exhaust manifold can be installed by cleaning the surface areas on both the head an the manifold itself and then by using the exhaust manifold gasket and putting it in place. Once the gasket is in its location you can put the manifold onto the heads and begin to torque it down to 25 ft-lbs. I always use some copper spray from permatex on the exhaust manifold gaskets to ensure I do not end up with any exhaust leaks once done. When you go to install the engine into the vehicle or if it is already in the vehicle the torque specs for the exhaust manifold to the exhaust pipes or catalytic converter is 20 ft-lbs. The EGR system consists of a series of pipes that range from the manifold to the head.

Chevy Silverado 1500 Exhaust Manifold Torque Spec : 25 ft-lbs

Chevy Silverado 1500 Exhaust Pipe Torque Specs : 20 ft-lbs

 

Water Pump and Thermostat Installation

The water pump on the Chevy 4.3L engine should be installed by using a new gasket and if desired some silicone sealant to help prevent leaks. Be sure to clean both metal surfaces prior to installing the pump. Once prepared the pump can be moved into placed and then the corresponding brackets can be put into place. The water pump bolts go through the brackets and then through the water pump into the engine. The water pump bolts should be torqued to 35 ft-lbs. When you get to it the water pump pulley bolts and the fan clutch bolts can be tightened down to 17 ft-lbs.

Chevy Silverado 1500 Water Pump Torque Specs : 35 ft-lbs

Chevy Silverado 1500 Water Pump Pulley Torque Specs : 17 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 either oil or coolant inside the engine then feel free to add some sealant along with the gasket. Always be sure to inspect your gaskets and replace them if there is any deteriation or flaws with them. For the belt system the crankshaft pulley gets torqued to 70 ft-lbs. The belt tensioner can be tightened to 18 ft-lbs and the idler pulley can be torqued down to 30 ft-lbs. When installing be sure they both turn smoothly and if they do not then replace them with new ones as the bearings can go bad. The engine motor mount can be installed onto the engine block if it hasn't been already, the torques for the mount to the block is 59 ft-lbs and then when installing the mount to the vehicle or frame it can be torqued to 35 ft-lbs. Finally the throttle body can be installed on top of the intake manifold with a good gasket and some added sealant using 7 ft-lbs in a criss cross pattern. For installing the belt you can use a tool to move the tensioner into its springed state and install the belt as shown in the picture. The power steering pump pulley should be tightened down to 14 ft-lbs.

Chevy Silverado 1500 Crankshaft Pulley Torque Specs : 70 ft-lbs

Chevy Silverado 1500 Idler Pulley Bolt Torque Spec : 30 ft-lbs

Chevy Silverado 1500 Belt Tensioner Torque Specs : 18 ft-lbs

Chevy Silverado 1500 Motor Mount to Engine Torque Specs : 59 ft-lbs

Chevy Silverado 1500 Motor Mount to Frame Torque Specs : 35 ft-lbs

Chevy Silverado 1500 Power Steering Pulley Torque Specs : 14 ft-lbs