07 GS350 Manifold removal - ClubLexus - Lexus Forum Discussion

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07 GS350 Manifold removal

 
Old 03-14-19, 04:53 PM
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DJWolf
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Default 07 GS350 Manifold removal

i am in the process of replacing my catalytic converters on my car. I am down to the last two bolts on the driver side header. The ones that sit under the manifold but are conveniently blocked by the steering shaft.

unlike the exhaust write up, the gs350 does not seem to have a way to move the steering shaft to get to the last two manifold bolts.

any assistance on how to properly tackle these two bolts would be greatly appreciated.

edit.
AWD

Last edited by DJWolf; 03-14-19 at 05:00 PM.
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Old 03-14-19, 10:06 PM
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potatomon
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I believe you need to raise the engine.

Last edited by potatomon; 03-14-19 at 10:10 PM.
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Old 03-14-19, 11:35 PM
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Originally Posted by potatomon View Post
I believe you need to raise the engine.
i was figuring it would be something a bit more extreme than the steering shaft. At least it is a solution as this is driving me nuts. I want to get back to focusing on my 460!

I will look up the motor mount procedure, but if that fails, would you know where/how many mounts there are?

Thanks!
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Old 03-15-19, 12:20 AM
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There's 2 in the front u just take off the 4 nuts and u can raise the engine it should clear the steering
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Old 03-15-19, 08:39 PM
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That worked out. It was still quite a pain to get to them, but the additional room was all that was needed.

i am assuming the driveline is next to come down as it is blocking the header from coming out.

What size hex wrench is needed, and would you happen to know the torque specs on these bolts?

thanks again, I'll be glad when this is done!

Last edited by DJWolf; 03-15-19 at 08:57 PM.
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Old 03-15-19, 10:08 PM
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Originally Posted by DJWolf View Post
That worked out. It was still quite a pain to get to them, but the additional room was all that was needed.

i am assuming the driveline is next to come down as it is blocking the header from coming out.

What size hex wrench is needed, and would you happen to know the torque specs on these bolts?

thanks again, I'll be glad when this is done!
what driveline? I think it can come out from the top. But you might still need to pull something

Not sure on the torque of front cardan I believe it's a 6mm. They are maybe 40nm they don't need to be super tight and u think they didn't want people to overtorque and break those bolts so they didn't use regular bolts these ones it's very easy to strip them out from the inside. Once you feel that the socket is starting to wanna spin in the bolt, stop. But I wouldn't touch that till you really have to. Unless the boots are torn
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Old 03-16-19, 11:59 AM
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Pulling from the top seems impossible. The space is tight and would probably need the valve cover to be pulled off :P. So underneath seems to be the best. That's how the pass side came down.

Thanks for the warning and torque specs, I figured I'd use an impact driver to avoid rounding out the hex heads. Did you happen to know what size they are? I tried everything I have was either a 1/4 or 3/8 and it was too big. If not, I'll just go buy a couple below this size.

thanks again.
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Old 03-16-19, 12:25 PM
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Originally Posted by DJWolf View Post
Pulling from the top seems impossible. The space is tight and would probably need the valve cover to be pulled off :P. So underneath seems to be the best. That's how the pass side came down.

Thanks for the warning and torque specs, I figured I'd use an impact driver to avoid rounding out the hex heads. Did you happen to know what size they are? I tried everything I have was either a 1/4 or 3/8 and it was too big. If not, I'll just go buy a couple below this size.

thanks again.
6mm internal hex socket
Yeah top looks a bit packed now. To disconnect front driveshaft throw it in neutral put a hex key into one of the bolts and rest the key against the frame so it stops the shaft from spinning. Undo 6 bolts. Do just the transmission side first and hopefully you can clear I say this cuz the driveshaft is prolly rusted to the flanges so you gotta use a chisel and a mallet to break it free but that might not be possible with the subframe still on but maybe it's not rusted on
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Old 03-16-19, 12:29 PM
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CV axles are very to to remove once they rust inside. Good luck! There are threads of guys building special pullers to yank it out
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Old 03-16-19, 12:40 PM
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i just used a really thin chisel thing that I sharpened with a grinder.

Maybe if you remove alternator and a few wires you can still pull it from the top, assuming you raise the engine. Beats pulling the driveshaft

Last edited by potatomon; 03-16-19 at 12:45 PM.
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