4.2 Changeover Valve Part Number Question
Thread Starter
AudiWorld Member
Joined: Dec 2003
Posts: 550
Likes: 1
From: Metro DC
4.2 Changeover Valve Part Number Question
I need a replacement linkage for one of the vacuum-actuated changeover valves on my '00 4.2. The part number on the item itself -- 077 907 327A -- doesn't seem to show up in any of the catalogs -- can anybody steer me in the right direction? Thanks.
AudiWorld Senior Member
Joined: Oct 2009
Posts: 1,065
Likes: 2
From: Plano, TX
first, what is it you're trying to replace? more specifically, what has failed? there is a superceded part number for the "repair kit", as the valves are apparently no longer available.
Tech Guru
Joined: Oct 2002
Posts: 8,009
Likes: 191
From: Olney, MD
Thread Starter
AudiWorld Member
Joined: Dec 2003
Posts: 550
Likes: 1
From: Metro DC
Thanks for the replies so far! The part I need is the black plastic arm.
Am I correct that if I just need the arm that I'm better off going for the Gruven replacement?
In the process of diagnosing this problem, I discovered that the valve itself is difficult to move back and forth by hand, even if the spring is removed from the mechanism. But when I unbolted the valve from the block and slide it out about an inch and then moved it by hand, it was much easier to manipulate. Thoughts?
Am I correct that if I just need the arm that I'm better off going for the Gruven replacement?
In the process of diagnosing this problem, I discovered that the valve itself is difficult to move back and forth by hand, even if the spring is removed from the mechanism. But when I unbolted the valve from the block and slide it out about an inch and then moved it by hand, it was much easier to manipulate. Thoughts?
AudiWorld Senior Member
Joined: Oct 2009
Posts: 1,065
Likes: 2
From: Plano, TX
My plastic arms are 9 years and 130k miles old and I've successfully removed and reinstalled them at least 5 times. There's no reason to spend $60 on a set of billet ones when the stock ones work just fine.
Thread Starter
AudiWorld Member
Joined: Dec 2003
Posts: 550
Likes: 1
From: Metro DC
Thanks for this thought, RNT. My concerns, however, are a) that one of my plastic arms is already broken (in part because the valve is stickier than it probably should be), and b) that stock arms aren't available as separate parts -- or are they, and if so, what's the part number?
AudiWorld Senior Member
Joined: Oct 2009
Posts: 1,065
Likes: 2
From: Plano, TX
Mine were stuck completely. It took a pair of pliers to rotate the arms (rods are what you broke), so I pulled them apart, lubricated and cleaned the shaft seals on which the arms pivot, and now they work as they should. For your theory to hold, the engine would have to produce enough vacuum for the actuator to break the rod, which seems unlikely to me.
Take the whole control system apart (don't bother disassembling the intake mani), clean and lubricate everything, put the broken rod back together with epoxy and paperclips, and assemble it carefully. Refer to the writeup link in my sig if anything is unclear.
Take the whole control system apart (don't bother disassembling the intake mani), clean and lubricate everything, put the broken rod back together with epoxy and paperclips, and assemble it carefully. Refer to the writeup link in my sig if anything is unclear.
Trending Topics
Thread Starter
AudiWorld Member
Joined: Dec 2003
Posts: 550
Likes: 1
From: Metro DC
Mine were stuck completely. It took a pair of pliers to rotate the arms (rods are what you broke), so I pulled them apart, lubricated and cleaned the shaft seals on which the arms pivot, and now they work as they should. For your theory to hold, the engine would have to produce enough vacuum for the actuator to break the rod, which seems unlikely to me.
Take the whole control system apart (don't bother disassembling the intake mani), clean and lubricate everything, put the broken rod back together with epoxy and paperclips, and assemble it carefully. Refer to the writeup link in my sig if anything is unclear.
Take the whole control system apart (don't bother disassembling the intake mani), clean and lubricate everything, put the broken rod back together with epoxy and paperclips, and assemble it carefully. Refer to the writeup link in my sig if anything is unclear.
Am I correct that the shaft-end bolt is an Allen head but that the two bolts holding the shaft seal housing parts, etc. are Torx?
How did you get those wide pics -- did you have the radiator out?
AudiWorld Stories
Bringing Audi to Life for Audi Fans
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
9 Audi Designs That Aged Like Fine Wine
Verdad Gallardo
2026 Audi Q5 Buyer's Guide (Every Model Explained)
Brett Foote
Ranking Every Current Audi 'S' Model From Worst to First!
Joe Kucinski
10 Best Audis That are FINALLY LEGAL to Import to the U.S.!
Joe Kucinski
Thread Starter
AudiWorld Member
Joined: Dec 2003
Posts: 550
Likes: 1
From: Metro DC
BTW I do think the vacuum pressure broke the rod. Many moons ago, I discovered that the valve was sticking and that the rods were both intact. When I later inspected the rods, the one on the stuck valve had broken into two pieces.
Tech Guru
Joined: Oct 2002
Posts: 8,009
Likes: 191
From: Olney, MD
There's a lot to be said for the OEM plastic links as well as repairing/JB Weld the OEM links. IF the link doesn't break, it WILL tear up the vacuum motor. And those vacuum motors aren't available separately, only as part of a $700 (IIRC) repair kit. Sometimes the vacuum motors will turn up on a used manifold but good vacuum motors are generally part of the used manifold (I bought a used manifold and it had one torn vacuum motor...fortunately it was the one that wasn't torn on MY manifold, OTOH maybe the vacuum motors are the same, I dunno, haven't gotten around to checking out the two manifolds that are sitting in my garage!).