how to change a head gasket? - B15sentra.net - Nissan Sentra Forum
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#1 Old 02-04-2008, 09:58 AM
se-r2004
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how to change a head gasket?

anyone have a write up on here to change a head gasket?

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#2 Old 02-04-2008, 10:56 AM
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Basically take everything apart until you get to the head, and swap the gaskets. Putting it back together is the really fun part.

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#3 Old 02-04-2008, 11:09 AM
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yeah i was just wondering if anyone had pics on it....like how do i get the timing right?
Quote:
Originally Posted by zsoker89
Basically take everything apart until you get to the head, and swap the gaskets. Putting it back together is the really fun part.

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#4 Old 02-04-2008, 11:10 AM
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BigDave took a shot at it, apparently you have to be pretty careful lining things back up.

Can't find his thread, sorry.

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Originally Posted by Maxx View Post
I was just thinking....I've owned Nissan products built in each of the last 4 decades (70's -- 00's.) That is pretty cool. I honestly don't know why I have owned so many Nissan products. They are like herpes....they keep popping up in your life.
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#5 Old 02-04-2008, 11:14 AM
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something i probably wouldn't recommend doing yourself unless you're experienced with it

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#6 Old 02-04-2008, 11:24 AM
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Yeah not a regular DIY project. A guy on here tried it himself having never done it before and lined the cam up wrong I believe. I think he ended up bending some valves. It will be a major undertaking and you should really have a mechanic check out your work as you are putting it back together.

EDIT: Here's his write-up: http://www.b15sentra.net/forums/show...ght=headgasket

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#7 Old 02-04-2008, 11:24 AM
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Quote:
Originally Posted by shanno575
something i probably wouldn't recommend doing yourself unless you're experienced with it
Ditto... and you have to machine/grind the block + Heads to make it flat before putting the new HG back... why do you think shops charge in excess of 600$ for a new one?... i recommend a HG Treatment... where they take the gasket out, and using tar and a few other things to make the break seal. usually about 200$ and good for about 10,000 Miles.

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#8 Old 02-04-2008, 12:23 PM
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I did mine 3000 miles ago. It cost me roughly 250 to get the head clean, resurfaced, valves adjusted.

Get the haynes manual. Make sure you have all the tools the say in the manual. And buy all new fluids and drain the ones in the car before taking it apart. Change out you water pump and thermostat as well as clean your Intake manifold an Idle air control valve. It helps trust me. Everything gets dirty.

I recommend getting some heavy duty zip ties to hold the timing chain on the pullys if you have never done it before.

I did mine myself and I tell you its not easy. Takes time and patience. Save 1000 dollars and get it done right at a family operated shop and not the stealership.

I have an 01 Sentra gxe by the way.

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#9 Old 02-04-2008, 12:31 PM
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there's a haynes manual for the b15?

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#10 Old 02-04-2008, 12:57 PM
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i was just wonder cause im think either that is wrong or my fuel injector....the spark plug looks good work fine.....but i get a #3 cylinder misfire all i got left to go is the headgasket and the fuel injector...it idles and drives like total crap right now..any ideas?

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#11 Old 02-04-2008, 12:59 PM
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well have you done a leak down test to confirm it's your head gasket? are you missing coolant? is there coolant in your oil? does it overheat? if your car is acting up as bad as you say it is, i would guess there would be a lot more clues that it's your head gasket.

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Last edited by shanno575; 02-04-2008 at 01:07 PM.
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#12 Old 02-04-2008, 12:59 PM
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If you ever overheated the motor, head/block must be milled.
If you're replacing w/a mls headgasket head/block should be milled though i have heard some people, not sentra owners, use a very fine grit sand paper on a small aluminum block and sanding down the surface lightly while spraying wd-40 to prep. Some use copper spray w/o milling the surfaces and just sanding. Can't say it won't leak but some found success.
If you never overheated and you plan to use just the oem composite gasket, you should be fine just to remove all previous gasket material w/a razor blade. I doubt milling is required.
Another tip, just as bigdave did, mark your chain/camgears/crankshaft w/a whiteout or something to make sure you're able to reinstall your chain properly. Once the chain is reinstalled, rotate the crank slowly by ratchet to confirm the valves and pistons clear. No need to disassemble your head unless you plan to change your valve seals too.
Good luck and keep us posted w/your progresss

Last edited by LowBudgetBaller; 02-04-2008 at 01:10 PM.
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#13 Old 02-04-2008, 01:34 PM
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whats a leak down test???....... car hasnt over heated stays how it always has.. i also marked the coolant tank to see if it does change no change yet..also no rust or anything on the spark plug.. gas mileage is like 16mpg though!

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#14 Old 02-04-2008, 01:34 PM
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have you checked your o2 sensors? known to cause crappy gas mileage if they're bad

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#15 Old 02-04-2008, 01:38 PM
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yeah i replace the maf and the first o2 sensor

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