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[robson]

Sorry if this is a silly question but where is my HBV. I have looked where it should be, under the scuttle, but see nothing like a plastic space ship.I assume I have one. 2003 2.6.

[grifter]

It can be hard to see it sometimes without stripping out the scuttle, do you have that out?

http://www.omegaowners.com/forum/index.php?topic=90574.0

[Nick W]

Find the heater hoses where they go through the bulkhead - next to the brake servo.
Trace them back towards the engine.
A few cm away from the bulkhead you'll find the HBV.


This is much easier to change with the scuttle removed, but  it isn't necessary.

[Doctor Gollum]

It mounts to the back of the 135 cylinder head.

The extra effort that comes with leaving the scuttle in place far outweighs the subsequent water damage from the scuttle leaking.

Removing the plenum significantly improves access. 

[johnnydog]

It mounts to the back of the 135 cylinder head.

The extra effort that comes with leaving the scuttle in place far outweighs the subsequent water damage from the scuttle leaking.

Removing the plenum significantly improves access. 

If the scuttle is removed and replaced correctly, then why should it leak? I have removed mine numerous times, with no subsequent leaking, and the original foam (which is still present on all of them) is always dry.

[Nick W]

It mounts to the back of the 135 cylinder head.

The extra effort that comes with leaving the scuttle in place far outweighs the subsequent water damage from the scuttle leaking.

Removing the plenum significantly improves access. 

If the scuttle is removed and replaced correctly, then why should it leak? I have removed mine numerous times, with no subsequent leaking, and the original foam (which is still present on all of them) is always dry.

The scuttle is a beauty trim made of plastic. Once you've ensured that it directs water away from anything important(and removing the foam does that), who cares if it leaks? Several jobs are much easier without it in place, so being able to remove it quickly is worth retaining.

[Doctor Gollum]

It mounts to the back of the 135 cylinder head.

The extra effort that comes with leaving the scuttle in place far outweighs the subsequent water damage from the scuttle leaking.

Removing the plenum significantly improves access. 

If the scuttle is removed and replaced correctly, then why should it leak? I have removed mine numerous times, with no subsequent leaking, and the original foam (which is still present on all of them) is always dry.

The scuttle is a beauty trim made of plastic. Once you've ensured that it directs water away from anything important(and removing the foam does that), who cares if it leaks? Several jobs are much easier without it in place, so being able to remove it quickly is worth retaining.

The issue stems from the bottom edge of the windscreen.

It is impossible to remove the scuttle without disturbing the lower trim. Where people have future problems then they almost always stem from the screen side, and unless care is taken, then they will allow water to run where it doesn't belong... ie onto coil packs etc.

The only job that actually requires it to be disturbed is to replace the wiper motor.

[TheBoy]

As long as the bottom of the windscreen seal is fully fitted to the screen, I've never, ever seen this mysterious, problematic scuttle leak.  Foam attached or otherwise (the foam does help with sound deadening)

[johnnydog]

It is easier to remove the scuttle by removing the lower rubber moulding first. This avoids distorting the moulding to gain access to the plastic twist retaining clips.
This also allows the area at the base of the windscreen to be checked for corrosion, and to clear the groove in the hard plastic retainer of any silt before refitting the lower moulding. After cleaning the moulding, prior to refitting it, I always put a thin wipe of rubber grease on the tongue - this makes refitting and subsequent removal so much easier, without putting too much force on the lower retainer.

[Doctor Gollum]

There are alot of variables to that area...

For example :

Has the screen ever been replaced?

Was it a competent fitter?

Has the scuttle ever been off previously?

Is the screen/rubber/frame/scuttle clean or caked in detritus?
Are the twist clips all present?

Is the scuttle intact?

Is the frame fitted to the bottom of the screen correctly? Does the rubber clip in as it should? Both should be fitted to the screen BEFORE it is fitted and the scuttle should be fitted before the screen.

If if twist clips are all there, is the rubber intact?

So, yes, you can simply pull the scuttle, but unless you're aware of the above, then you can inadvertently screw it up and allow water to get where it has no business and not even realise.

Re the soundproofing benefits, that's subjective. The Omega is reasonably refined, but it's not that great.

[Doctor Gollum]

It is easier to remove the scuttle by removing the lower rubber moulding first. This avoids distorting the moulding to gain access to the plastic twist retaining clips.
This also allows the area at the base of the windscreen to be checked for corrosion, and to clear the groove in the hard plastic retainer of any silt before refitting the lower moulding. After cleaning the moulding, prior to refitting it, I always put a thin wipe of rubber grease on the tongue - this makes refitting and subsequent removal so much easier, without putting too much force on the lower retainer.

You or I or Nick and many others might do that. But what of the three previous HBVs that were swapped out at CBA garages or worse?

[GastronomicKleptomaniac]

I always put a thin wipe of rubber grease on the tongue.

Did that once. Tasted funny.

[johnnydog]

I always put a thin wipe of rubber grease on the tongue.

Did that once. Tasted funny.