S/C Bypass Acorn Sheild

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Mar 28, 2003
Somewhere in NJ
About a couple of weeks ago I posted about my bypass making a whining noise when I came to idle. My worst fear was that the bypass valve was shot and I wouldn't be able to find another one since these blowers are no longer made.

Since I'm planning a trip of almost a thousand miles in a few weeks, I figured I'd bite the bullet and pull it to see if I could repair it myself, or if I needed to send it off to Eaton for a rebuild ($$$).

So I pulled the throttle body adapter off this morning, and much to my surprise and relief, found that the problem was simply that some pesky mice or squirrels had gotten under the hood and had a good old time with some acorns, leaving the husks to fall into the top of my bypass valve and block the diaphragm from moving completely.:mad::cheers:

Because the bypass is a PITA to get to and clean out, I decided to work out a means of defeating the nasty rodents, and came up with this. Hope other who have superchargers and nasty little four legged creatures find it useful.

First, to get to the bypass valve, you have to remove the TB and then the TB adapter on the back of the blower. On the back side of the TB adapter sits the bypass valve. Maybe some pics will help.

The top pic shows the bypass valve from the top. You can see the orange colored diaphragm now that I've removed all the acorn husks.

The picture below it shows my solution: I used a standard faucet valve (hard rubber) which I drilled out the hole just slightly larger than it had been to allow it to float up and down on the arm that the diaphragm is attached to.

In the third picture, you can see a nut holding the cam that's attached to the diaphragm arm. It has a tab which must be bent to loosen the nut (already bent back here). Once the cam is removed, slide the faucet washer over the arm (beveled side down in my case) and ensure it can move freely up and down on the arm. Replace the cam and nut, then bend the tab back.

The last pic is of the washer now installed on the arm. It's just the right size to block crap from falling into the diaphragm hole.

Now the whistling is gone and I'm red to go.:cheers: HTH

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