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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 03-08-2017, 01:26 PM   #1
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Join Date: May 2005
Location: UCLA/Bay Area
Posts: 51
My Ride: carbon black e46 m3
DIY: E46 M3 Remove accidental snapped Constant Pressure Valve (CPV) from engine block


This DIY is to show you how to remove an accidentally snapped, exploded, or stuck Constant Pressure Valve (CPV) from the engine block after accidentally over tightening, so you do not have a panic attack like what I experienced.

The issue:
If you are reading this, then you probably did something similar to what I did. You accidentally used a torque wrench to tighten the CPV and had the torque set to 35 lbs (because you read too fast after googling E46 M3 CPV torque specs) and heard a pop sound. Afterwards, the CPV kept spinning clockwise as you tightened, but it was not tightening.


How a snapped constant pressure valve looks like after you remove the top portion:

Tools required to extract the remains of the Constant pressure valve from Harbor Freight tools:

How it will work:

This tool will work because the drag link socket is wide enough to still catch on the the remaining teeth of the Snapped Constant Pressure valve.

Stick the above tool in the hole with firm pressure and turn counter clockwise:

The tool will catch on to the remaining teeth of the snapped Constant pressure valve bolt out and unscrew it out.

The Tool depicted above was inspired by a post on the M3forum from a brilliant member who invented this type of tool with a thumbwheel ratchet to solve the above issue: "petik."



I hope this DIY helps prevent someone from panicking like I did.

All the best.


Last edited by mrpinstripsuits; 03-08-2017 at 02:43 PM.
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