Changing Sparkplugs
Hi,
I am going to change spark plugs, and coils. As part of the process I will remove the muffler, to get better and easier access. My question is, can I buy just the Bolts and nuts for the left and right catalytic clamps. I believe I have to loosen both to get the muffler out. My bolts and nuts is pretty corroded. I see they sell the Catalytic clamps with bolts and nuts attached as a kit on Sunset Porsche. Appreciate any input. |
https://cimg8.ibsrv.net/gimg/rennlis...b0ee25fe8a.jpg
Pictured is the clamp that connects left muffler to the center muffler. These bolts/nuts are corroded because of heat cycles and water exposure. I recommend you replace them. The clamps themselves were in good shape so I reused them (didn't have replacements anyway). https://cimg4.ibsrv.net/gimg/rennlis...a1f3ba54b1.jpg Fister sells the replacement bolts as a kit for $10. Also pictured here is the reversible ratchet wrench I used to get the 13mm nuts loose that hold the muffler bracket to the cat. If you take the rear bumper off you won't need this tool. |
Seems like a lot of extra work to me. There really is quite a bit of room with mufflers in place...once you get used to it.
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https://cimg0.ibsrv.net/gimg/rennlis...635a225e47.jpg
"Wonder Wrench" employed on the 12 o'clock cat nut for L muffler support bracket. With rear bumper off you can use standard ratchet and socket. This nut and one at 8 o'clock are the only ones you'll need to take off to remove the mufflers. I put new copper exhaust nuts on at reassembly. The cat bolt at 4 o'clock snapped off when I went to replace that nut. I punched the stub out of the flange and fitted an M8 bolt and new copper nut. |
Originally Posted by 4Driver4
(Post 15135603)
Seems like a lot of extra work to me. There really is quite a bit of room with mufflers in place...once you get used to it.
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Cut the bolts off and replace with Home Depot. Takes 15 min (second time, first time is a couple hours). Then let rust until next time
From a NEOhio 4 season driver. |
Originally Posted by dgjks6
(Post 15135800)
Cut the bolts off and replace with Home Depot. Takes 15 min (second time, first time is a couple hours). Then let rust until next time
From a NEOhio 4 season driver. 900 075 365 02 (Screw, M8 x 30), qty 3 for each flange 900 910 003 03 (Hexagon nut, M8) |
Originally Posted by swingwing
(Post 15135825)
Easier said than done if you're talking about the 3 bolts on the cat flanges. They're press-fitted into the flange; even if you cut them you'll have to punch the stubs out of the flange. Couple of whacks with a good punch and hammer ejected the one that snapped on me. I subbed an M8 bolt from spares and new copper nut.
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Thanks Gentlemen.....Appreciate the information.
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Why couldnt you reuse the original bolts and nuts?
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Remove the mufflers for an easier R&R on the sparkplugs for a 997.1. It takes about 15 minutes to remove them. I used liberal amounts of PB blaster on the exhaust/cat bolts and they came off fine and went back on fine.
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Originally Posted by platinum997
(Post 15135876)
Why couldnt you reuse the original bolts and nuts?
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Understand..If your doing it go stainless.
McMaster is a good source. https://www.mcmaster.com/#91287a154 |
My cat boots were corroded so cutting was the only choice. I had to use a punch to eject the studs. First one was scary. I replaced them with regular bolts and nuts. And I promised to loosen them every 6 months so it didn't happen again. Plan did not work. They are already so corroded they are going to need cut off next time. For some reason only the cat ones corroded that bad. The ones to the center muffler still look new.
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It's mostly the heat cycles in the cats. Add exposure to the road salt in winter months and presto, you're fighting accelerated corrosion. As platinum997 suggests you might try stainless bolts. I bought a pack of 25 copper plated exhaust nuts from Amazon for $11:
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