Report: Exhaust Manifold Can Warp and Cause the Studs to Break Off
Nissan Quest Problem
Average Mileage: 177,666 mi (134,000 mi - 263,000 mi)
The exhaust manifold often warps and cracks, breaking off the studs between the cylinder head and the exhaust manifold. The noise may be most noticeable when the engine is cold.
Visitor, 1996 Nissan Quest, 136,000 mi
My neighbor and good friend recently gave me their 1996 Nissan Quest. The Quest began making a "ticking" noise when cold, and when they inquired about the cost to repair the problem decided it was time to let the car go. They offered it to me because I like working on cars in my spare time.
The "ticking" noise was clearly coming from the engine compartment and upon inspection I found a small crack in the forward-facing exhaust manifold (transverse mounted V-6). I initially tried to fix the crack with a high temp [2-part] epoxy designed for metal repairs.
I was careful to clean and prepare the repair site as per the instructions and allow the full "cure" time for the epoxy. Initially, the repair was successful. But no more "ticking" from the forward manifold just made it clear I had a similar problem with the other manifold. A clear, but less loud, "ticking" was coming from the backside of the engine. Two things were clear: Exhaust was leaking from something back there and this time it was going to be very hard (maybe impossible) to find and fix the problem. In mini-vans such like the Quest the rear-facing side of the motor as almost inaccessible.
I had to use a small (inspection type) video camera mounted with a light on a long flexible metal probe just to be able to see the area where I believed the leak to be. In order to do any repairs in this area of the engine would require either dropping the engine or raising the body to gain access - not an easy job either way.
The next day as I was driving to the auto parts store and considering my options a terrible odor alerted me to the fact my "high-temp" epoxy fix was not going to work. The fully hardened epoxy melted and was blown out of the crack in the manifold and all the while it produce a stench I can not describe. Please don't try my [failed] repair! Bad, bad idea.
The video inspection did not reveal any cracks in the rear facing exhaust manifold but it looked like the entire manifold was separating from the cylinder head. The Quest has a problem with warping or cracking exhaust manifolds as well as fatigue failure of the manifold bolts. Clearly, one or all these problems may be at work here.
I have not been able to decide what to do. These are my choices:
1)Pay up to $900.00 to have a shop do the repair
2)Do the complicated and time consuming repair myself
3)Donate the van.
I'll let you know what I decide but I'm open to any suggestions or advice available from your readers.
Thank you for your consideration
Visitor, 1996 Nissan Quest, 134,000 mi
Two exhaust manifold studs are broken off. Engine still runs OK.
Have not fixed the problem
Visitor, 1998 Nissan Quest
Studs broke,,,makes noise,... too much to fix it and no one wants to do the job because they can't get at the broken studs
Visitor, 1998 Nissan Quest, 263,000 mi
i have a 98 nissan quest....awsome little van...great gas mileage...no issues...except the ticking noise which i think is my manifold...if anyone else is experiencing this issue also please email me @ jsalmini16@yahoo...thx