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head gasket

2878 Views 23 Replies 4 Participants Last post by  internetautomart
i'm pretty sure one of my head gaskets are blown. how much is the labor for a replacement on average?
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yeah, if you're not burning coolant or leaking it, if you're not burning oil or leaking it...

but it's pretty obvious when it happens.. especially if it's all coming out between the block and head.

but here's the situation your looking at to fix it if that's what happened...
(and take into account that you do ALL THE WORK, otherwise, put your car up for sale or part it out and make more money)

well.. nissan engines are overhead cams w/ timing chains.. which means you have to remove, the entire front of the engine.. all the accessories.. alt, water pump, p/s, a/c, then the engine's front covers.

the valve covers and all the air intake and crap around the top of the engine is what you took off first.

then when all the front stuff is off and valve covers are off with all the non essential crap out of the way.. you have to take off the timing chain, idler sprocket, and cams, then you CAREFULLY pull the heads (this involving an indepth unbolting/retorque sequence that has to be followed so you don't warp the heads)

then after an extensive cleaning procedure (giving, you had the engine covered during the long time it's opened) you put a head gasket on it and put it all back together making sure it's timed just as well as the dearlership could do it.

long story short.. it's cheaper to go out, find a replacement engine.. drop that in, and rebuild your original engine while you're hoping the one you dropped in lasts you.

hell, even if you didn't get the replacement engine, go out and spend 400 dollars on shop jacks and engine lift and stand so you can pull the engine and do the headgasket job outside of the car...

it's easier.

it's quicker.

it's more precise when torquing the heads.

and i've left a lot out of this... someone could do it easily, but w/o the equipment, it's takes a bit.
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yeah dude...
if your car starts at all..
it's NOT the head gasket, although, depending on how deep you get into it, you may end up changing it anyways... leaving yourself with a brand new engine if you throw in rings and valve seals.

i'm more along with Rogo.
it sounds electrical.

the clutch thing could be anything, could be a previous owner didn't like having to push the clutch in to start it, so they made a bypass for the clutch switch.

like Rogo said... go around the entire engine bay and under the dash, checking for disconnected connectors... bad relays, fuses, wires cut, corrosion/resistance.
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yeah, for a while...
then when you run out of oil and coolant...
your rings melt along with your bearings...
then you need another crank, head, and timing chain... possibly pistons.
then it doesn't start.

course, if it is bad enough, on certain cars, the engine needs a certain amount of compression to start... as do all cars.

i did say it wouldn't start, but i was thinking more of the compression part of it. after a minute it won't enough.
was meaning a blown head gasket leaking oil and coolant...

i've seen a 200sx that had JUST blown the gasket, and it was leaking oil EVERYWHERE.

yeah, it'd start, but keep it running for a minute or longer and you'll oil starve the engine... making it not start until you fully rebuild it w/ hope.
you're tellin me, i get sick of punks that act important when they probably work at a freakin 7-11.

if you want to know if there's a prob w/ the O2 sensor, do an ecu code check..
if it comes up, replace it, see if it changes anything.

jerking and stalling in a car can be a lot of things, it depends on sounds and actions the cars making during particular rpms/speeds/driving conditions.

how exactly is it acting? when?

could be vacuum, could be fuel, could be spark.

an o2 sensor just detects how much oxygen is in the exhaust... if your engine isn't burning the fuel enough, then the EGR is opened (because of the o2 sensor's info) and the exhaust is recirculated into the intake... if the vacuum lines are old and cracked it can cause stuttering

but ey.. i'm sure there's someone on here that's all-knowing and will tell me i'm completely wrong, even though i'm halfway right. in other words, dont take my word for it, there's a few guys on here that have been techs for a while.
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