C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Plenum Removal - Need Right Tool

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Old May 19, 2004 | 11:25 AM
  #1  
JScott 88 C4's Avatar
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Default Plenum Removal - Need Right Tool

Almost every Torx bolt on the intake runner / plenum is accessible accept for the one underneath the plenum. What combination of ratches, wrenches, sockets, etc., do I use to get that last bolt out?
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Old May 19, 2004 | 12:17 PM
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Default Re: Plenum Removal - Need Right Tool (JScott 88 C4)

I assume your seeing the MAT sensor underneath. The 4 bolts on the each side plus the power brake booster connection (on driverside rear, flare nut wrench) and assorted TB, vacuum line connections are all that need for removal. A good whack with a dead blow hammer (or regular sledge hammer with wood) is sometime needed.


[Modified by dgoodhue, 12:18 PM 5/19/2004]
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Old May 19, 2004 | 12:35 PM
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Default Re: Plenum Removal - Need Right Tool (dgoodhue)

Get a torx bit that is the correct size. Get a universal socket that fixs the shaft of the bit. Glue the bit in the socket with RTV or Permetex. I used quarter inch drive Sears stuff.
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Old May 19, 2004 | 12:53 PM
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Default Re: Plenum Removal - Need Right Tool (JScott 88 C4)

I used the torx bit on a 8 inch extension. You need to get the DS back one from the PS and the PS front one from the DS.
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Old May 19, 2004 | 01:36 PM
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Default Re: Plenum Removal - Need Right Tool (JScott 88 C4)

I'm not sure which bolt you're referring to as "underneath" the plenum.

If you are referring to the runner bolts that go into the intake, there are actually two, one on the driver's side rear and one on the passenger side front. Each is accessed with a torx but and a long extension but from the opposite side of the engine.

The only thing I can visualize as being underneath the plenum is the manifold air temperature sensor which is toward the rear, near the distributor. But it simply unplugs.

What am I missing here?

Jake
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Old May 19, 2004 | 02:40 PM
  #6  
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Default Re: Plenum Removal - Need Right Tool (JAKE)

I'm not sure which bolt you're referring to as "underneath" the plenum.

If you are referring to the runner bolts that go into the intake, there are actually two, one on the driver's side rear and one on the passenger side front. Each is accessed with a torx but and a long extension but from the opposite side of the engine.

The only thing I can visualize as being underneath the plenum is the manifold air temperature sensor which is toward the rear, near the distributor. But it simply unplugs.

What am I missing here?

Jake
:iagree: Yeah for the plenum its just the T50 bolts, then the MAT which unplugs, and the power brake booster line, which is kind a pain, but a flarenut wrench will fit. Then a deadblow hammer to loosen it up if its never been off.
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Old May 19, 2004 | 03:05 PM
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Default Re: Plenum Removal - Need Right Tool (dgoodhue)

I use a 3/8 ratchet with a u joint swivel :yesnod:
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Old May 19, 2004 | 03:05 PM
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Default Re: Plenum Removal - Need Right Tool (JAKE)

A long allen wrench or ball driver can be used on that rear bolt.

To install it later a magnetic wand will be very helpful.
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Old May 19, 2004 | 03:12 PM
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Default Re: Plenum Removal - Need Right Tool (65Z01)

The best way to remove the rear is to remove the wiper motor first. :)
When I did the heads I puled the wiper first and man was it easy to get to
stuff back there.
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Old May 19, 2004 | 04:58 PM
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Default Re: Plenum Removal - Need Right Tool (JScott 88 C4)

Snap On sells a T-40 Torx socket that is 7" long made to take the Runner bolts out. I purchased one and it's saved me ton's of time and money. I purchased 4 torx bolts I stripped out for $4 each from the dealer. It is a worthwhile investment! Here is a link to it if you want to take a look. I can't remember if it worked on that bolt you are talking about but it definitely makes removing most of the runner bolts a breeze.
http://buy1.snapon.com/catalog/pro_d...re&dir=catalog :flag
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Old May 19, 2004 | 11:26 PM
  #11  
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Default Re: Plenum Removal - Need Right Tool (Alzado77)

You need this...

http://forums.corvetteforum.com/zerothread?id=813319
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Old May 26, 2004 | 10:41 PM
  #12  
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Default Re: Plenum Removal - Need Right Tool (Steel Blue 91)

Yep, tried the same set-up. Still too much in the way to get at it.
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Old May 26, 2004 | 10:42 PM
  #13  
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Default Re: Plenum Removal - Need Right Tool (dave_85)

Didn't think of this one. Will try out.
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Old May 26, 2004 | 10:43 PM
  #14  
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Default Re: Plenum Removal - Need Right Tool (JAKE)

1st assumption was correct. The intake runner tubes. Thanks for the advice.
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Old May 27, 2004 | 12:26 AM
  #15  
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Default Re: Plenum Removal - Need Right Tool (JScott 88 C4)

Yep, buy the Snap-On Long Torx Bit..I have one and it saves time..definetely the right tool for the bottom inside bolts.
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Old May 27, 2004 | 12:36 AM
  #16  
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Default Re: Plenum Removal - Need Right Tool (JScott 88 C4)

I didn't have any problem getting mine out, but I remember everything else needed to be off first.
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Old May 27, 2004 | 12:23 PM
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Default Re: Plenum Removal - Need Right Tool (87NassauBlue)

You did remove the plenum before you tried to remove the runners, right?
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