Aftermarket catback install question..nuts/bolts rattling off

AllWheelsDriven · 10-23-2000, 08:48 AM

Hey all..

I just put my 5zigen cat back system on and a week later after it got progressively louder, I put it on the ramps again and one of the bolts between the 5zigen center pipe and the zigen exhaust had disappeared. Thus the noise.

I was unhappy with the fit between the 5zigen center pipe and the stock cat pipe so i put the stock center pipe back in and connected it to the zigen exhaust with the gasket inbetween.

My question is how does leaving out the washers influence the nuts/bolts rattling off eventually? What are the best washers to use here and where should i use them to hold this thing together better?

TIA

Mike

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STORER · 10-23-2000, 08:55 AM

Torquing down the fastner the proper amount will keep the fastener from rattling apart. Use a split washer to help keep tension on the fastners. You might want to use a mild Lock Tight, not the heavy duty stuff.

Fitz · 10-23-2000, 10:24 PM

To echo what Storer said, you can either use a lockwasher which looks like a washer with a slit halfway through it....or use a Nyloc, which is a steel nut with a nylon insert which greatly improves retention forces. The fit is kinda crappy from the cat to my mid pipe (2.25" apexi) but so far no leaks. I went the Nyloc route..just FYI.

Fitz

10-23-2000, 08:48 AM	#1
AllWheelsDriven Scooby Specialist Member#: 1737 Join Date: Jun 2000 Chapter/Region: NWIC Location: 3rd Generation Seattle Local Vehicle: 2005 BMW zhp www.vispoint.com	Aftermarket catback install question..nuts/bolts rattling off Hey all.. I just put my 5zigen cat back system on and a week later after it got progressively louder, I put it on the ramps again and one of the bolts between the 5zigen center pipe and the zigen exhaust had disappeared. Thus the noise. I was unhappy with the fit between the 5zigen center pipe and the stock cat pipe so i put the stock center pipe back in and connected it to the zigen exhaust with the gasket inbetween. My question is how does leaving out the washers influence the nuts/bolts rattling off eventually? What are the best washers to use here and where should i use them to hold this thing together better? TIA Mike * Registered users of the site do not see these ads.

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10-23-2000, 08:55 AM	#2
STORER Scooby Newbie Member#: 2253 Join Date: Sep 2000 Location: Mentor, Ohio, USA Vehicle: 2000 2.5 RS Red	Torquing down the fastner the proper amount will keep the fastener from rattling apart. Use a split washer to help keep tension on the fastners. You might want to use a mild Lock Tight, not the heavy duty stuff.

10-23-2000, 10:24 PM	#3
Fitz Scooby Guru Member#: 1426 Join Date: May 2000 Chapter/Region: NESIC Location: Goffstown, NH Vehicle: '07 335xi, '07 ZX6R SV650 Race Bike	To echo what Storer said, you can either use a lockwasher which looks like a washer with a slit halfway through it....or use a Nyloc, which is a steel nut with a nylon insert which greatly improves retention forces. The fit is kinda crappy from the cat to my mid pipe (2.25" apexi) but so far no leaks. I went the Nyloc route..just FYI. Fitz