Rear crankcase breather hose replacement
09-29-2007, 08:59 PM
#1
Rear crankcase breather hose replacement
Mine turned to gum, and I tore the driver-side one while replacing the valve cover gasket. I'll be damned if I'm going to pay the $132 for a simple breather hose no matter how fancy the moulded shape, so I looked for a substitute.
Abbott Rubber in Elk Grove Village, IL sells suitable standard fuel line hose, thicker and tougher than the Audi original; the 3/4 inch size is perfect for the rear breather hose application. It's less than three dollars per foot, and two feet is plenty for each hose.
http://abbottrubber.thomasnet.com/viewitems/hose-automotive-hose/fuel-line-hose?&forward=1
The OEM hose hugs the back of the motor and has a fancy moulded flange for the rear valve cover connection. To use normal hose, after much experimentation I concluded that the best path was to connect it at the bottom, arch it over the heater hoses and rearwards through the vacuum hose loop mess, then bring it around and straight forward to the valve cover, going under the heater hoses at the top. It's easier to see when the car is in front of you. Pep Boys sells a wire spiral apparatus that enables you to bend a straight hose fairly sharply without kinking it; not necessary, but nice.
Know that this job is a truly painful bloody b!tch due to the fact there is practically zero clearance at the back of the motor, plus a maze of vacuum and heater hoses, plus lots of sharp edges. Don't even bother with latex gloves, they'll be ripped to shreds in seconds. To gain a few precious inches of clearance I removed the cruise control linkage. Removing the vacuum and heater hoses would probably help more, and if I ever have to replace that hose again I will do that.
The original clamp at the bottom of the original hose is a one-use strap affair. To secure the new hose, I used a worm clamp, reaching down from the top with an 8mm box end 12 point wrench, moving the clamp screw/bolt a few degrees, then repositioning it to do a few more degrees, something on the order of forty times. DO YOURSELF A HUGE FAVOR AND USE A SPRING CLAMP. It doesn't have to be very strong, and the spring can be positioned from the top relatively easily.
Abbott Rubber in Elk Grove Village, IL sells suitable standard fuel line hose, thicker and tougher than the Audi original; the 3/4 inch size is perfect for the rear breather hose application. It's less than three dollars per foot, and two feet is plenty for each hose.
http://abbottrubber.thomasnet.com/viewitems/hose-automotive-hose/fuel-line-hose?&forward=1
The OEM hose hugs the back of the motor and has a fancy moulded flange for the rear valve cover connection. To use normal hose, after much experimentation I concluded that the best path was to connect it at the bottom, arch it over the heater hoses and rearwards through the vacuum hose loop mess, then bring it around and straight forward to the valve cover, going under the heater hoses at the top. It's easier to see when the car is in front of you. Pep Boys sells a wire spiral apparatus that enables you to bend a straight hose fairly sharply without kinking it; not necessary, but nice.
Know that this job is a truly painful bloody b!tch due to the fact there is practically zero clearance at the back of the motor, plus a maze of vacuum and heater hoses, plus lots of sharp edges. Don't even bother with latex gloves, they'll be ripped to shreds in seconds. To gain a few precious inches of clearance I removed the cruise control linkage. Removing the vacuum and heater hoses would probably help more, and if I ever have to replace that hose again I will do that.
The original clamp at the bottom of the original hose is a one-use strap affair. To secure the new hose, I used a worm clamp, reaching down from the top with an 8mm box end 12 point wrench, moving the clamp screw/bolt a few degrees, then repositioning it to do a few more degrees, something on the order of forty times. DO YOURSELF A HUGE FAVOR AND USE A SPRING CLAMP. It doesn't have to be very strong, and the spring can be positioned from the top relatively easily.
09-29-2007, 09:04 PM
#2
Re: Rear crankcase breather hose replacement
I should add that the true difficulty in using a worm clamp at the bottom of the vent hose is that there is no way to get either a ratchet or a screwdriver in position to tighten the clamp.
Thread
Thread Starter
Forum
Replies
Last Post
mfyock
Audi 4000 / Coupe GT Discussion
1
10-01-2001 02:57 PM
