[E-Type] Engine Breather

Hello all.

So this crankcase breather/emission thing stuck on the front of the
cylinder head…how does it work? what’s inside it? what’s it
supposed to do?

Regards,

Dr.G–
Dr.G
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In reply to a message from Dr.G sent Mon 24 Nov 2003:

Nothing at all is inside it. It’s just a collection point for
crankcase fumes to be sucked into the air cleaner plenum. Just make
sure it’s clean and has good hoses on it.–
The original message included these comments:

So this crankcase breather/emission thing stuck on the front of the
cylinder head…how does it work? what’s inside it? what’s it
supposed to do?


Paul Wigton, 1963 FHC, called Tweety!
Brighton, CO, United States
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In reply to a message from Wigster sent Mon 24 Nov 2003:

There is a screen between the housing and head.
Bob–
Bob Muzio
West Hills, Ca., United States
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In reply to a message from Bob Muzio sent Mon 24 Nov 2003:

What’s that screen for anyhow? Keep out flys?–
The original message included these comments:

There is a screen between the housing and head.
Bob


'70 E Roadster, '98 XK8 Roadster, '02 Mini Cooper
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In reply to a message from Richard Liggitt sent Mon 24 Nov 2003:

Does anyone have suggestions for excluding exhaust fumes from the
cabin?–
ron welsh
houston, texas, United States
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In reply to a message from Wigster sent Mon 24 Nov 2003:

Is it safe to plumb the breather to the carb air inputs??..on the
V12 ZS they are plumbed into the carb body…is this the same as
plumbing into the air inlets for the carb??–
Glenn Miskiewicz, 1971 E Type V12 2+2
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In reply to a message from Richard Liggitt sent Mon 24 Nov 2003:

The screen doesn’t keep flies out, it keeps engine parts in :slight_smile:
Bob–
Bob Muzio
West Hills, Ca., United States
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In reply to a message from Glenn Miskiewicz sent Mon 24 Nov 2003:

This is an interesting question. When the SII car matured to
strombergs and the small aircleaner, Jag no longer plumbed the
breather to the air cleaner. Instead the plumbed it directly into
the carbs (like on the S3). The thing that intrigues me is that the
difference in the size of the plumbing. When it went into the
aircleaner the pipes were about 7/8’‘D but the carb connectors are
only about 1/4’'D.

My guess is that the carbs take-offs provide a much higher PSI
suction and thus a larger pipe is not necessary. But just a guess.

The answer to your question is yes you can plumb the breather to
the air cleaners. The thing to make note of is if the plumbing is
large enough in diameter to provide a reasonable vacuum at the
breather.

There is a phenomenon that occurs on this directly-to-carb plumbing
system and thats that it is prone to leaking. They didn’t apply
clamps to the rubber tubing interconnects and a small leak in this
system will cause one or more of the carbs to lean out. It’ll drive
you nuts trying to adjust your carbs.

Richard Liggitt–
The original message included these comments:

In reply to a message from Wigster sent Mon 24 Nov 2003:
Is it safe to plumb the breather to the carb air inputs??..on the
V12 ZS they are plumbed into the carb body…is this the same as
plumbing into the air inlets for the carb??


'70 E Roadster, '98 XK8 Roadster, '02 Mini Cooper
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In reply to a message from Wigster sent Mon 24 Nov 2003:

Thanks everyone.

It’s just that it’s got the word ‘’…device…’’ on the top of it,
and that implies more than just a hollow tube to me.

Why have the vertical section of the ‘‘device’’ at all if its empty?
Why not just run the breather tube straight into the dome?

Are you sure there aren’t some baffles inside, that oil could
condense on and run back into the engine or something like that?

Regards,

Dr.G–
Dr.G
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In reply to a message from Dr.G sent Mon 24 Nov 2003:

First off, G, what’s the series Jag we’re talking about? If it’s
the vertical style as on an SI/S1.5, that is precisely its
function…to act as an oil trap for the oil in the fumes…then out
the top and over to the breather.–
The original message included these comments:

It’s just that it’s got the word ‘’…device…’’ on the top of it,
and that implies more than just a hollow tube to me.
Why have the vertical section of the ‘‘device’’ at all if its empty?
Why not just run the breather tube straight into the dome?
Are you sure there aren’t some baffles inside, that oil could
condense on and run back into the engine or something like that?


Paul Wigton, 1963 FHC, called Tweety!
Brighton, CO, United States
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Nothing in there :slight_smile: Just a screen, relatively coarse one at that. All it does is vent crankcase pressure to be fed into the carbs as opposed to out into the atmosphere.
pauls 67ots

Hello all.

So this crankcase breather/emission thing stuck on the front of the
cylinder head…how does it work? what’s inside it? what’s it
supposed to do?

Regards,

Dr.G
<<<<<<<<<

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomoFrom: “Dr.G” dr_nicholson@yahoo.com
Subject: [E-Type] Engine Breather

Ron,
Make sure your tranny shifter boot is intact. Make sure any holes in the firewall are sealed up. Make sure the tranny cover is tight against the firewall.
pauls 67ots

In reply to a message from Richard Liggitt sent Mon 24 Nov 2003:

Does anyone have suggestions for excluding exhaust fumes from the
cabin?


ron welsh
<<<<<<<<

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Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomoFrom: “ron welsh” rwelsh@velaw.com
Subject: Re: [E-Type] Engine Breather

In reply to a message from Wigster sent Mon 24 Nov 2003:

wigster, its an s1 4.2 1964.–
The original message included these comments:

First off, G, what’s the series Jag we’re talking about? If it’s


Dr.G
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Dr. G,

In the parts book, it’s just “Front Cover and Breather Housing”.
Where’s “device” come from?

Jerry

Jerry Mouton '64 E Type FHC “Laissez les bons temps rouler!”
Jaguar Owner’s North American Tour - http://jonat.org
April 15, 2004 - July 4, 2004----- Original Message -----
From: “Dr.G” dr_nicholson@yahoo.com

It’s just that it’s got the word ‘’…device…’’ on the top of it,
and that implies more than just a hollow tube to me.

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Ron,

Don’t forget what duct tape was invented for! It works fine
for sealing up verarious cracks and holes.

What year and model E Type are you working on?

Jerry

Jerry Mouton '64 E Type FHC “Laissez les bons temps rouler!”
Jaguar Owner’s North American Tour - http://jonat.org
April 15, 2004 - July 4, 2004----- Original Message -----
From: “Paul Spurlock” jagdood@earthlink.net
To: “jaguar” e-type@jag-lovers.org
Sent: Monday, November 24, 2003 6:47 AM
Subject: [E-Type] Engine Breather

Ron,
Make sure your tranny shifter boot is intact. Make sure any holes in the
firewall are sealed up. Make sure the tranny cover is tight against the
firewall.
pauls 67ots

From: “ron welsh” rwelsh@velaw.com
Subject: Re: [E-Type] Engine Breather

In reply to a message from Richard Liggitt sent Mon 24 Nov 2003:

Does anyone have suggestions for excluding exhaust fumes from the
cabin?


ron welsh
<<<<<<<<

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Dr. G,
Nope nada, no baffles, no nothing. I’m speculating the reason for the height is so that gravity will prevent engine oil flying around from the timing chains from getting out, only gasses. As far as the rest of the design I also speculate that is simply a convenience in plubming so that the connector hoses don’t require being bent. I have one in the garage if you want to see a pic.
pauls 67ots

In reply to a message from Wigster sent Mon 24 Nov 2003:

Thanks everyone.

It’s just that it’s got the word ‘’…device…’’ on the top of it,
and that implies more than just a hollow tube to me.

Why have the vertical section of the ‘‘device’’ at all if its empty?
Why not just run the breather tube straight into the dome?

Are you sure there aren’t some baffles inside, that oil could
condense on and run back into the engine or something like that?

Regards,

Dr.G
<<<<<<<<

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomoFrom: “Dr.G” dr_nicholson@yahoo.com
Subject: Re: [E-Type] Engine Breather

In reply to a message from Jerry Mouton sent Mon 24 Nov 2003:

Jerry,

‘‘device’’ is embossed on the top of it with a load of other stuff.

Anyway, if it says ‘‘housing’’ in the book, what is it supposed to
house?

Dr.G–
The original message included these comments:

Where’s ‘‘device’’ come from?


Dr.G
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Hmmm – there is nothing embossed on mine – or on
any other one I have seen. Mine is highly polished all
over. Got any photos? See mine at

Does yours look the same? What year is it, anyhow?

Note how a too-big belt looks on the pulleys ; -) proper size is nearly
straight up and down at the tensioner.

Oh, it houses the tiny family responsible for breathing the oil ; -).

Jerry

Jerry Mouton '64 E Type FHC “Laissez les bons temps rouler!”
Jaguar Owner’s North American Tour - http://jonat.org
April 15, 2004 - July 4, 2004----- Original Message -----
From: “Dr.G” dr_nicholson@yahoo.com

‘‘device’’ is embossed on the top of it with a load of other stuff.

Anyway, if it says ‘‘housing’’ in the book, what is it supposed to
house?

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In reply to a message from ron welsh sent Mon 24 Nov 2003:

All I can say is remove carpet and check for a crack or hole in the
firewall. Also, notice if it’s worse when the fan or heat is on,
otherwise no-big-deal.–
The original message included these comments:

Does anyone have suggestions for excluding exhaust fumes from the
cabin?


JOHNATHAN SPAAR
SPOKANE, WA, United States
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I was thinking the smoke… other than the lucas smoke :slight_smile:
pauls 67ots

…Oh, it houses the tiny family responsible for breathing the oil ; -).

Jerry
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Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomoFrom: “Jerry Mouton” jerry@moutons.org
Subject: Re: [E-Type] Engine Breather