Head gasket replacement on a chev spark b12d engine

usa/canada

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Before head gasket replacement have you checked these
Intake Manifold Gaskets May Leak Coolant or Engine Oil
engine or leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.
Leaking Water Pump May Cause Coolant Loss and Overheating
A coolant leak may develop from the . The may overheat as a result of the coolant loss. A leaking water pump should be replaced.
Headgasket replacement
step 1. undo negative battery cable or completely remove battery and tray.
step 2. remove air cleaner and associated piping if it is in the way to allow access to head, drain cooling system and remove upper radiator hose.
step 3. remove top portion of exhaust manifold.
step 4. remove intake manifold and fuel injection rail as necessary
step 5. remove spark wires and valve cover.
step 6. remove drive belts and top timing cover before removing timing belt find all alignment marks and paint to improve your visibility and aid in reassembly if no marks are present remove spark plug # 1 and rotate until piston is at tdc and check timing mark on crankshaft that it is on 0 then paint the belt and cams anything that has teeth that the timing belt rides on make a mark to aid in reassembly even if you are replacing t-belt at least you can compare to new belt and transfer marks, release tension on t-belt tensioner and remove t-belt.
step 7. remove head bolts start loosening at inside and work outwards reemove head bolts and pay attention to sizing and placement.
carefully check for anything that is still attached to head and if free tap head with rubber or dead blow hammer to free from block and lift straight up so as not to ruin or bend any of the alignment pegs.
step 8. remove head gasket material with non-scratching tools or scrapers or buff pads made for that job. making note of where it was blown.
step 9. decide if you should send head to machine shop to have mating surface made flat again and also to have valves and related parts inspected or replaced. usually about $300-$400
step 10. inspect block remove all gasket material look for pitting or scarring also use straight edge to determine if it is straight or if it needs to be resurfaced by a machine shop.
step 11. install new headgasket and check fit. If all is good reassemble in reverse order of removal and I always like to replace crank seal ,cam seal, water pump, t-belt and tensioner also thermostat, drivebelts, spark plugs, cap, rotor, wires, pcv valve, intake manifold ,exhaust manifold gaskets.
this is just a broad overview hope it helps you will have to get haynes manual or similar for head torque values and what not

To replace a blown head gasket requires a lot of labor on this vehicle. Its a v6, meaning you have 2 head gaskets to replace instead of just 1. It requires removing air cleaner, disconnecting battery, removing most of the accessories that are belt driven, removing the intake manifold, egr valve and tubing, exhaust manifold on both sides of engine, timing belt removal, valve covers, and a few smaller items. After removing everything on top of the engine, you'll have access to the cylinder head bolts. Removing them will allow you to lift off the cylinder heads. Before replacing the gaskets, you must send them to a machine shop to have the gasket surface milled true flat again. They must also be inspected for cracks (which will sometimes happen with blown head gaskets) which would render them useless.
If this is a vehicle you really like, perhaps consider investing in a quality used motor. Its less labor intensive, less repeat repair, and you may come out saving a few bucks.

first thing is. why did the gasket blew? overheated, detonation or preignition, was the headgasket replaced before, does the car has alot of miles on the engine, did you squeeze everything out of the engine power wise? these are most common causes of a blown headgasket.

the first thing you need to do is find an OEM or reinforced gasket and replace it. if you never done it before take it to a mechanic or someone who is good at it. also check if the head and possibly block is warped ( if the surface where the gasket goes on is bent). if it is take it to a machine shop or replace it.

if you will do it yourself make sure to remove the head studs in correct sequence. and when putting it back together put it the correct sequence and use torque wrench to tighten the studs correctly. approximately 60-75 ftpounds.

If the oil in the engine has become yellow/white then you have probably got a headgasket problem. Look in the engines coolant expansion bottle. If you have an oil/water mix there too, it's a sure sign. hope this helps...

if the engine runs rough after spark plug replacement,you may have a clogged fuel injector perhaps. i would suggest that you purchase lucas fuel injector cleaner and add it to your gas. you may have also just bought some bad gas. if you suspect that, just add 1 bottle of clear rubbing alcohol{not green} clear rubbing alcohol to your gas tank.this will dry up any water thats in your fuel.it will not affect the engine at all. as for your head gasket,its something you cannot predict any mileage on,but you can prevent it by not letting your engine overheat. never run your engine hot. always keep your collant full.if you suspect a blown head gasket, here are some signs of a blown head gasket. oil in the coolant,coolant mixed in your engine oil{when you pull the engine dipstick out,it appears muddy looking,coolant coming out of your exhaust pipe.these are quite a few examples of a blown head gasket. hope this helps and thank you for choosing fixya.com

pull all of the spark plugs and roll the engine over please protect your eyes and that will tell you what side it is comming from by coolent shooting out. then you can pull the bad side apart to see if it is indeed a head gasket or a cracked head.

don't run the engine with coolant in the oil the sugar content in most anti freexes will crystalize the rod and main bearings causing severe internal damage to the crankshaft! pull the spark plugs one at a time! to see which one has water on them and then remove the cylinderhead on that side and replace the head gasket and check for a crack around the exhaust valves but tis better when you tear a engine down! too! replace both!! head gaskets!

Typical symptoms of a blown headgasket may include: -bubbles of air coming up into your radiator (remove cap before starting) -leaking radiator -milkshake colored oil -overheating -rough running -coolant or oil running from head -spark plug(s) that have a green tint (if green coolant). -white colored or sweet smelling exhaust, white smoke of your tail pipe, or loosing coolant through your overflow

no, not a blown headgasket, remove the valve cover and inspect the spark plug hole seals(tube seals in the valve cover) replace if brittle and old. also change the valve cover gasket since u have it off...adjust the valves as well