Pictures of how I replaced the exhaust manifold, (and PASSED CA SMOG!!) on my 87-95 Nissan Pathfinder.
I was super bummed. The old girl failed smog.
She failed the super strict California smog test.
O2, and CO are fine. The HC, hydrocarbons, are too high.
Hold on to your wallet. Here we go.
It sounds like the right exhaust manifold, so let's take a look.
To see anything I gotta get the heat shield off. So WD-40
Heat Shields. Six bolts, three high and three low through the wheel well.
That was difficult.
Two bolts moves the fuel filter out of the way.
This fuel filter holder just unclips and I can set that aside.
Those areas on the left and right stained light look like leaks.
Light looks likes leaks.
Also in this picture I have a mirror under the manifold
so I can look under to see the nuts.
I took off the nuts in the reverse order of this picture.
Basically that is outside to inside.
Each nut has a thick washer behind it.
The washers are not magnetic. What are they made of? Copper?
Magnet on a stick did not help me retrieve these when I inevitably dropped them.
Then I get to crawl under the car and remove the nuts
from the manifold to down pipe connection.
So easy and not eyes full of dirt and laying in a pile of greasy dust at all.
- Now this will be so easy to remove. I just wiggle this. Maybe if I pull from this side. I just have to get this angle. DAMN IT!
There's the old manifold and the new one.
Looks like there is another leak here on the underside.
This is a manifold, not a header. Manifolds are rough thick cast iron.
Headers are smooth welded steel tubing. Just found that out.
Here are the exhaust ports, valves inside.
Should they be white like that?
Running rich means they should be black, no?
For a spark plug that is true.
Maybe exhaust valves get hotter than a spark plug.
Again, looking back up with a mirror.
Header studs need to be installed.
Header studs installed.
I think I was supposed to use thread locker.
But I used anti sieze absolutely everywhere.
When in doubt, I get the WD-40 and anti sieze.
Here's the old gasket and the new one.
The kit manifold came with two new gaskets.
One with with a thin edge on one side
or the one with the sides of uniform thickness.
The old gasket broke into pieces,
but I reconstructed it to compare.
Looks like I will use the uniform thickness.
FSM says tighten bolts in this order
and to 13-16 ft lbs.
Some of the studs came out with the nut,
so I put anti sieze on them too. Love that anti sieze.
I do not know if I am supposed to use this or not.
I am just guessing. The FSM did not say anything about it.
There's the new manifold installed.
There are new gaskets on the down pipe.
This is the new gasket for the downpipe to the catalytic converter flange.
This is the old gasket that I put in when I did the transmission.
This gasket does not look like the original.
This gasket has that extra layer circle in the center.
That extra layer makes the flange bend when I tighten the nuts on the flange.
I installed it and started the engine,
and I could feel the exhaust puffing out the sides of the flange.
So I ripped out the center cirle and the metal ring
from the new gasket.
Then I bent the exhaust pipe flange straight(er) with an adjustable wrench.
Then I got some exhaust cement paste
and slathered it all over the new modified gasket.
I also got it in my hair and on my face, and that's bad. M'kay.
- Then I installed it, tightened it up, let it dry overnight, and...
Passed that smog test, bitch! YEAH!
- Next I sold out to make 02¢
so I can fulfill my lifelong dream of owning a 1986 944 with blown head gaskets.
But no minivans!
- Then I finished my beer.
Donate to CharityIf this site has helped you, or even if it hasn't, please help care for abused and neglected children by making a donation to The Valley of the Moon Children's Home. That's right, abused and neglected children. Visit their website and try not to cry, you cold hearted bastard. Their site talks about how they achieved their goals and built a new home, but that was years ago. They still need cash to take care of all the kids there. Breaks my heart and pisses me off.
Think: Cars are expensive, powerful, and heavy. Before I start work, I face the possibility that I will destroy my vehicle, my own life, and innocent pedestrians' lives. If anyone messes with a 4000 lb machine capable of 100 mph, these are real possibilities. If I get in over my head, I call a professional mechanic. The information on this website is provided only for entertainment purposes, and it is not intended as advice on how to service a vehicle. For all you know I made this up. Don`t believe everything you read on the internet.
Disclaimer: The technical information in these documents is provided without any warranty whatsoever and at no cost. All information is in general terms and is not meant to apply to your particular situation, be current at the time you read it, or even be correct in the first place. Improperly maintained vehicles can lead to serious injury, death, or unavoidable accidents. The author is not responsible for any errors on this site, and does not make any claim at all about the validity, safety, or veracity of the information contained on this website. Any work you choose to do or not to do on your vehicle is done at your own risk. The information on this site is not intended to serve as a replacement for professional advice, professional workmanship, dealer service, union labor, or psychological counseling. The author disclaims any and all liability directly or indirectly arising from the application or use of any information or idea contained on this or any other web site. By opening this page, you agree to never sue anyone ever or allow anyone to be sued on your behalf. The appropriate professional should be consulted regarding your specific condition. BeerGarage.com does not take responsibility for the information posted on other sites to which it links.
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Last modified: 9/10/2016