1 8t Pressure Relief Valve Replacement

1.8t Pressure Relief Valve Replacement

by: Spirare


Background:

A couple of months ago 'someone' noticed some oil leaking out of the A4 (97 1.8t, AEB). The culprit was the Pressure relief valve on the inlet side of the turbo.

Tools:

  • Wire Snips
  • Philips Screwdriver
  • Flathead Screwdriver

Parts:

  • PCV Valve 058-905-291
  • PCV Crankcase valve 034-129-101-B
  • Hose Clamps

  • A couple of months ago 'someone' noticed some oil leaking out of the A4 (97 1.8t, AEB). The culprit was the Pressure relief valve on the inlet side of the turbo. I found the part in my Bently, it's number 6 in the image:
bentleyline1wqa.jpg
  • I decided to also change the PCV on the crankcase. Here are the new valves and part numbers:
valvesnew3ij.jpg
  • Here are the tools you need:
allthetools9rya.jpg
  • Here is the "034" valve in the car:
034oldincar9ksa.jpg
  • Here is the "058" valve in the car:
058incar5mia.jpg
  • This is a closeup of the "034" valve:
034closeup1ffa.jpg

Instructions? I don't think that you need them based on the images.

Notes:
When replacing the 058 valve you may find it simpler to pull one side of the valve and put the new one on prior to fully removing the old one. It will prevent you from putting it in backward on accident.

The 034 hose clamps are a hassle to reach. Make sure you put them back on in the easiest orientation for future replacement.

This is a simple job and the parts are cheap. $24 for the 034 and about $9 for the 058. These valves should be swapped out as maintenance items.

Extra Information:

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