How to Replace Head Gasket on Chevy 350 Engine
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The is quite possibly Chevrolet's most popular small-block engine. Although the is known for its durability, this does not mean that the engine is always problem-free.
A blown cylinder head gasket is typically caused by overheating, and results in a substantial loss of power and the harmful mixing of antifreeze and engine oil. Replacing the head gasket may initially seem like an arduous task, but on the Chevy the process is much easier than on many other types of engines.
Remove the carburetor and distributor from the top of the intake manifold. The carburetor is attached to the intake manifold with four nuts. One nut is at the base of each corner of the carburetor. Remove the four nuts with a wrench, then lift the carburetor away from the intake manifold.
The distributor is held to the intake manifold with a single bolt at the base of the distributor. Remove the nut with a wrench, then pull the distributor straight up to remove it. Drain the radiator and disconnect the upper radiator hose from the intake manifold. Loosen the single bolt at the bottom of the radiator on the driver's side to drain it.
The upper radiator hose attaches to the front of the intake manifold with a hose clamp, which features a single screw. Loosen the screw with a screwdriver, then pull the hose away from the intake manifold. Remove the intake manifold, the exhaust manifold and the valve cover. The intake manifold attaches to the engine with four bolts on each side of the manifold.
Pull out the bolts with a wrench, then lift the manifold off the engine. The exhaust manifold attaches to the side of the cylinder head with six bolts. Remove those bolts with a wrench, then pull the manifold away from the engine until it disconnects from the cylinder head.
The valve cover attaches to the top of the cylinder head with four bolts. Remove those bolts and pull the cover off the cylinder head. Loosen the eight rocker arms, then remove the eight pushrods and the cylinder head. Locate the single nut in the middle of each rocker arm. Loosen the nut on all eight rocker arms until the tip of each rocker arm can be twisted away from the top of its pushrod; then pull the pushrods out of the engine.
Using a wrench, remove the 17 bolts that secure the cylinder head to the engine, then lift the head off the engine. Remove the old cylinder head gasket. Place the new cylinder head gasket onto the head's mating surface on the engine block, then lower the cylinder head onto the gasket. Do not apply gasket sealer to either side of the head gasket. Install each of the cylinder head's bolts, tightening each bolt only in small increments to ensure that the gasket seats evenly.
Slide each pushrod through the cylinder head, then position the tip of each rocker arm over its pushrod and tighten the rocker arm's bolt. Install the valve cover, exhaust manifold and intake manifold. The valve cover must be installed with a new gasket. Coat both sides of the gasket with gasket sealer, then place the gasket along the lip of the cover. Lower the cover onto how to become a gangster rapper cylinder head, then install and tighten each of valve cover's four bolts with a wrench.
The exhaust manifold must also be installed with a new gasket, but gasket sealer must not be used. Bolt the exhaust manifold to the cylinder head with the new gasket. The intake manifold uses four gaskets, all of which must be covered with gasket sealer. Place the coated gaskets onto the engine, then lower the intake manifold onto the gaskets and install the manifold's retaining bolts with a wrench. Connect the upper radiator hose to the intake manifold, and fill the radiator with antifreeze.
Slide the distributor into the engine through the intake manifold, then secure the distributor in place with its single retaining what process formed the great escarpment. Place the carburetor on top of the engine, then install and tighten each of the carburetor's four retaining nuts. John Stevens has been a writer for various websites since Stevens is a lawyer and licensed real-estate broker.
Step 1 Remove the carburetor and distributor from the top of the intake manifold. Step 2 Drain the radiator and disconnect the upper radiator hose from the intake manifold. Step 3 Remove the intake manifold, the exhaust manifold and the valve cover. Step 4 Loosen the eight rocker arms, then remove the eight pushrods and the cylinder head. Step 5 Place the new cylinder head gasket onto the head's mating surface on the engine block, then lower the cylinder head onto the gasket.
Step 6 Install the valve cover, exhaust manifold and intake manifold.
Loosen the nut on all eight rocker arms until the tip of each rocker arm can be twisted away from the top of its pushrod; then pull the pushrods out of the engine. Using a wrench, remove the 17 bolts that secure the cylinder head to the engine, then lift the head off the engine. . The liter Chevrolet engine has been installed in GM trucks, passenger cars and sport cars since If the head gasket on this engine fails, it will need to be replaced. Coolant leaking from the head gasket or water mixed in the oil are the usual symptoms of a blown head gasket. Sep 20, · Breaking down my SBC to check on the headgaskets.
Last Updated: January 11, References Approved. This article was co-authored by Jay Safford. This article has been viewed , times. The head gasket is found between the engine block and the cylinder head or heads in a V-type engine. The gasket functions as a seal that prevents the combustion process from leaking into the coolant passages that surround each cylinder. In many cases, it seals oil passages from coolant passages so the fluids do not mix.
The price for an independent mechanic to replace a head gasket can be high due to the time-consuming labor involved, so, it is essential to know why you need to replace the head gasket. Have a professional ASE certified Master Auto Technician inspect your vehicle to conclusively determine whether or not your car needs to have the head gasket replaced.
Tips and Warnings. Things You'll Need. Related Articles. All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc. Obtain a service manual for your car's make and model. It will include step by step procedures with images that explain how to replace your head gasket s.
It will also list any special tools that you may need. Drain all of the oil and coolant from your engine. Refer to your car's service manual for specifics, but in most cases this involves removing the exhaust manifold, the intake manifold, valve cover and drive belts. On many engines, you will need to remove the timing belt or timing chain.
Catalog each part as it is removed. Either take pictures or write down each part to help you remember where everything goes once you're done. The cylinder head is held on by several bolts and some engines have a sequence for the bolts' removal. Some head bolts cannot be reused and must be replaced. Follow the manual and manufacture requirements. Look at the head surface and the block along with the gasket for the failure areas. The gasket will be a thin piece of sealing material that can be seen once you remove the head.
The gasket can be made out of metal, deformable material, or a combination of both. The failure can be a break in the gasket. Check the block to be sure no warping has occurred and send the head or heads to an automotive machine shop to be pressure tested.
If the pressure test reveals no cracks, have the machine shop resurface the head s. Don't ever re-install a cylinder head that has not been professionally re-surfaced and examined for cracks. Check the service manual for the head bolt specifications to see if the bolts need to be replaced whenever the head gasket is replaced. Some bolts are what is called torque to yield type and would need to be replaced The cams on overhead cam motors will need the cams removed to service the cylinder heads.
Talk to the machine shop that is working on your heads about what needs to be removed before having them work on them. Clean the surface of the head and block. Do not scratch or remove any metal from either, as this may prevent the head gasket from sealing. Prevent any dirt or debris from getting into the cylinders or on pistons during the cleaning process. Inspect the piston tops and cylinder walls for any damage from the overheating or the head gasket problem.
Make sure all surfaces are clean and dry. Fit the head gasket onto the block. Use gasket sealant when specified by the manufacturer, and only use the directed amount in the particular places. Deviating from the manufacturer's recommendations can cause damage to the internal parts of the engine. Most head gaskets will be marked "top" and "up" for proper installation.
Use a torque wrench to tighten the head onto the block. Check the service manual for the head bolt torque sequence and the amount of torque that needs to be applied for each step. Some head bolts require 3 steps plus specified degree rotation as the final step. Set the timing belt or chain back to the proper alignment marks by carefully rotating the camshaft and crankshaft. Check to see if the engine is an interference type of engine. If so, there is a very specific method to rotate and set up the camshaft to crankshaft timing so you don't damage or bend the valves!
If equipped, install the distributor so it is properly timed with the number one cylinder. If applicable, adjust the valve clearance to proper specification. Fill the engine with new oil, replace the oil filter and fill the cooling system with new factory specified coolant.
When you start the engine, be sure to let the engine idle with the heater on full blast. This is so the cooling system has a chance to bleed out any air bubbles. Some engines require a specific cooling system bleeding procedure, be sure to check for that. Make sure the engine does not overheat during the purging process, or head gasket or head damage could occur again. Once all air is out of the cooling system and engine temperature is stable and in the normal range, check for any leaking oil or coolant.
Include your email address to get a message when this question is answered. By using this service, some information may be shared with YouTube. Head gasket failure is often caused by an engine overheating. Keep an eye out for signs you may need a replacement of a head gasket, which can include loss of engine compression, mixing of oil and coolant, loss of coolant, and loss of oil.
The two last causes can be very devastating to an engine if allowed to go on and may cause complete engine failure. Loss of coolant will cause the engine to overheat even more and potentially warp the head and other castings. Low oil can mean loss of the lubrication for the engine's internal mechanical components, which will increase friction increase wear on the engine parts.
If coolant got into the oil then this could have caused bearing failures on the crankshaft and pistons. Helpful 13 Not Helpful 7.
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Tule Daniel Dec 14, Guido Scallini Mar 6, Obviously an extremely knowledgeable writer. And best of all, direct to the job, no BS. Thanks one hell of a lot. Anonymous Apr 4, Rated this article:. Sbu Honeyberger Aug 18,