Differences on down pipes from exhaust manifolds?
12-03-2018, 09:20 AM
#1
Registered User
Thread Starter
Differences on down pipes from exhaust manifolds?
My oxygen sensor on my 89 4runner V6 is toast, and the nuts holding it on are so badly corroded, that they may not be removable at all. They are currently sitting with some penetrating fluid on them, and i am going to tackle them again in another day or so, but in case that doesn't work out, I will need to replace the front down pipe between the manifold and the cat.
Question is, the front down pipes are out of production from Toyota, and the only aftermarket ones I see say they will fit the 4Runners built after April of 1989. Since my 4runner was actually built in December of 1988, am I S.O.L. here? or does anyone happen to know if they are interchangeable?
Question is, the front down pipes are out of production from Toyota, and the only aftermarket ones I see say they will fit the 4Runners built after April of 1989. Since my 4runner was actually built in December of 1988, am I S.O.L. here? or does anyone happen to know if they are interchangeable?
12-03-2018, 10:25 AM
#2
They don’t interchange. Different bend and length. I had something similar happen where the O2 flange was rusted out and the entire exhaust had been poorly welded together without a cat. I ended up finding a good used pipe and having it reflanged so I could bolt it back together and drop in a new sensor and cat.
12-03-2018, 11:56 AM
#4
You can still get a complete aftermarket exhaust from the cat back for a 1st gen 4Runner. It’s just the downpipe that doesn’t seem to be available. A capable exhaust shop should be able to weld in a new bung if that’s all that’s wrong with yours.
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YoshiMan (12-05-2018)
12-03-2018, 07:01 PM
#5
Registered User
Mine too was rusted up and rounded off bad. I was able to get out using a deep socket and hammering it on then used a break over bar. I had mine off the truck in a vise and used lots of penetrating fluid.
12-04-2018, 06:57 AM
#6
Registered User
Should be able to get to the nuts with a dremel and small cut off wheel. On my V6 extended cab I used a dremel with flex shaft and a cut off wheel. Took my time working on the nuts and got them off without damaging the threads. Then just used some regular nuts & oil to clean the threads of rust & corrosion. Bought replacement nuts from toyota for final install.
cheers
cheers
Last edited by Andy A; 12-04-2018 at 06:59 AM.
12-05-2018, 05:51 PM
#7
Registered User
Thread Starter
Thank you guys for your input. I am pretty sure I will be able to get them off once i pull the pipe from the car, and if not, perhaps I will try the exhaust shop with welding in a new fitting in. the rest of the pipe appears to be in nice shape, even with 290,000 miles on it.
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