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... 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='2' face='Arial, Helvetica, sans-serif'>
<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
href="http://www.summitracing.com/parts/jrc-555-6402";>http://www.summitracing.com/parts/jrc-555-6402</a></div>
<div> </div>
</div>
<div style="clear: both;">
<div><font size="3">Alan Myers</font> </div>
<div>San Jose Calif. </div>
<div>'62 TR4 CT17602L</div>
<div><a href="mailto:amfoto1@aol.com";
saprocessedanchor="true">amfoto1@aol.com</a></div>
<div><a
href="http://www.triumphowners.com/to-car/tr4-14/";>http://www.triumphowners.com/to-car/tr4-14/</a></div>
<div> </div>
<div> </div>
</div>
<div><br>
</div>
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