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Well, of course the upper part isn't sealed from the lower. The oil pumped to
the rockers has to drain back down somehow. As was mentioned previously, it
goes through the push rod tubes.
My guess is that the cover is used in other applications (Vanguard?) and
whatever it was for was not implemented on the TR. Not enough space under the
hood.
Dave Massey
-----Original Message-----
From: Brad Kahler <bkahler1@gmail.com>
Subject: Re: [TR] TR4 road draft tube plug
Alan,
So much for the official Triumph documentation!
Does anyone know why the real early TR4s (and I think late TR3Bs) had the brass
plug in the top of the valve cover? I've never seen anything relating to that
plug written anywhere.
I don't think the bottom end can be completely sealed due to the openings for
the push rods. When the switch was made to the "sealed" system the draft tube
went away for good.
Thanks,
Brad
On Tue, Sep 8, 2015 at 4:48 PM, Alan Myers <amfoto1@aol.com> wrote:
... Then at
engine number CT14234E through end of TR4 production the
cars had air
filters with vent openings coming from a flame trap from the valve
cover
along with a "sealed" valve cover cap and no road draft tube. TR4As had
a
gulp valve with a vented (1/8" metered opening in the cap) valve cover
cap
and no road draft tube. This information was found in Service
Bulletin
I can tell you for certain that's incorrect. The change from open breathing to
flame-trap, etc. came later than that.
CT17791E (fitted to CT17602L, built in late October, 1962) originally had the
vented cap and the road draft tube.
The cap is the push on type, has big vents on the underside and filled with
coarse "steel wool" to reduce oil spray, I'm sure.
The road draft (or draught, I suppose) tube is large diameter, press fit into
the side of the block and locked in place with two screws (maybe 1/4 or 5/16").
The original valve cover has no vent, but it does have a large brass plug where
one could be fitted.
Never had a problem with oil out of the push on cap or an unusual amount of
leaks.... but the road draft tube kept most of the underside of the car rust
free!
The car now has an aftermarket cast alu valve cover with a breather pipe and a
low profile, twist-in filler cap (with a single, tiny breather hole).
I've replaced the road draft tube, but didn't plug it. It now has a nipple for
a 1/2" or larger hose fitting. I don't think it's a good idea to completely
seal up the bottom end of the engine. It needs to be able to breathe, same as
the top end.
Car is not yet back on the road, but when it is the plan is to have a catch
tank or can fitted with a breather cap, with hoses running from both the valve
cover and the fitting at the draft tube.
I intend to use a catch can similar to this:
http://www.summitracing.com/parts/jrc-555-6402
Alan Myers
San Jose Calif.
'62 TR4 CT17602L
amfoto1@aol.com
http://www.triumphowners.com/to-car/tr4-14/
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<font color='black' size='4' face='Arial, Helvetica, sans-serif'><font
size="4">Well, of course the upper part isn't sealed from the lower. The
oil pumped to the rockers has to drain back down somehow. As was
mentioned previously, it goes through the push rod tubes.<br>
<br>
My guess is that the cover is used in other applications (Vanguard?) and
whatever it was for was not implemented on the TR. Not enough space under
the hood.<br>
</font>
<div> <br>
</div>
<div style="clear:both"><font size="4">Dave Massey</font><br>
<br>
</div>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: Brad Kahler <bkahler1@gmail.com><br>
Subject: Re: [TR] TR4 road draft tube plug<br>
<br>
<div id="AOLMsgPart_1.2_c6246db0-6d44-4929-93a5-45906b159461">
<div class="aolReplacedBody">
<div dir="ltr">
Alan,
<div>
<br>
</div>
<div>
So much for the official Triumph documentation!
</div>
<div>
<br>
</div>
<div>
Does anyone know why the real early TR4s (and I think late TR3Bs) had the brass
plug in the top of the valve cover? I've never seen anything relating to
that plug written anywhere.
</div>
<div>
<br>
</div>
<div>
I don't think the bottom end can be completely sealed due to the openings for
the push rods. When the switch was made to the "sealed" system the draft
tube went away for good.
</div>
<div>
<br>
</div>
<div>
Thanks,
</div>
<div>
<br>
</div>
<div>
Brad
</div>
<div>
<br>
<div class="gmail_extra">
<br>
<div class="gmail_quote">
On Tue, Sep 8, 2015 at 4:48 PM, Alan Myers
<span dir="ltr"><<a target="_blank"
href="mailto:amfoto1@aol.com";>amfoto1@aol.com</a>></span> wrote:
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<font face="Arial, Helvetica, sans-serif" color="black" size="2">
<div>
</div>
<div style="color:black;font-family:arial,helvetica;font-size:10pt">
<blockquote
style="padding-left:3px;border-left-color:blue;border-left-width:2px;border-left-style:solid">
<pre><tt>... Then at
engine number CT14234E through end of TR4 production the
cars had air
filters with vent openings coming from a flame trap from the valve
cover
along with a "sealed" valve cover cap and no road draft tube. TR4As had
a
gulp valve with a vented (1/8" metered opening in the cap) valve cover
cap
and no road draft tube. This information was found in Service
Bulletin</tt></pre>
</blockquote>
</div>
<div>
</div>
<div>
<div>
I can tell you for certain that's incorrect. The change from open breathing to
flame-trap, etc. came later than that.
</div>
<div>
</div>
<div>
CT17791E (fitted to CT17602L, built in late October, 1962) originally had
the vented cap and the road draft tube.
</div>
<div>
</div>
<div>
The cap is the push on type, has big vents on the underside and filled with
coarse "steel wool" to reduce oil spray, I'm sure.
</div>
<div>
</div>
<div>
The road draft (or draught, I suppose) tube is large diameter, press fit into
the side of the block and locked in place with two screws (maybe 1/4 or 5/16").
</div>
<div>
</div>
<div>
The original valve cover has no vent, but it does have a large brass plug where
one could be fitted.
</div>
<div>
</div>
<div>
Never had a problem with oil out of the push on cap or an unusual amount of
leaks.... but the road draft tube kept most of the underside of the car rust
free!
</div>
<div>
</div>
<div>
The car now has an aftermarket cast alu valve cover with a breather pipe and a
low profile, twist-in filler cap (with a single, tiny breather hole).
</div>
<div>
</div>
<div>
I've replaced the road draft tube, but didn't plug it. It now has a nipple for
a 1/2" or larger hose fitting. I don't think it's a good idea to
completely seal up the bottom end of the engine. It needs to be able
to breathe, same as the top end.
<br>
<br>
Car is not yet back on the road, but when it is the plan is
to have a catch tank or can fitted with a breather cap, with hoses
running from both the valve cover and the fitting at the draft tube.
</div>
<div>
</div>
<div>
I intend to use a catch can similar to this:
<a target="_blank"
href="http://www.summitracing.com/parts/jrc-555-6402";>http://www.summitracing.com/parts/jrc-555-6402</a>
</div>
<span class="HOEnZb"><font color="#888888">
<div>
</div>
</font></span>
</div>
<span class="HOEnZb"><font color="#888888">
<div style="clear:both">
<div>
<font size="3">Alan Myers</font>
</div>
<div>
San Jose Calif.
</div>
<div>
'62 TR4 CT17602L
</div>
<div>
<a target="_blank" href="mailto:amfoto1@aol.com";>amfoto1@aol.com</a>
</div>
<div>
<a target="_blank"
href="http://www.triumphowners.com/to-car/tr4-14/";>http://www.triumphowners.com/to-car/tr4-14/</a>
</div>
<div>
</div>
<div>
</div>
</div>
</font></span></font>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
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0px;font-family: Tahoma, Verdana, Arial, Sans-Serif;font-size: 12px;color:
#000;background-color: #fff;">
<pre style="font-size: 9pt;"><tt>
<a href="http://autox.team.net/mailman/options/triumphs/dave1massey@cs.com";
target="_blank"></a>
</tt></pre>
</div>
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