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#863867 11/22/21 9:02 pm
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DavidP Offline OP
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Whose brilliant idea was it to angle the fitting on the tank upward?
Either way you route the return line, above or below the frame junction, the line gets kinked! Was this restriction by design?


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my pipe is horizontal. Can you post a picture?


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Years ago I bent mine down so that it was horizontal. And you are right...the original setup is a PITA.

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DavidP Offline OP
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Originally Posted by BigBars
my pipe is horizontal. Can you post a picture?
My tank vent is horizontal but the return angles up.
I checked, and the part number and image for the '72 and '74 oil tanks are identical. Maybe they changed the tank and kept the same part number?

return pipe.jpg return line.jpg

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David— from your photo it sure looks to me as though your return oil line is too large in diameter.
And the way it goes around the frame it looks to be too thin walled to.
Every Trident I have owned and known has had the oil pipe neatly going around the top of the frame tube.
Not a lot of room there but a nice compact installation.
Just my two cents worth of course.

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Originally Posted by Tridentman
David— from your photo it sure looks to me as though your return oil line is too large in diameter.
And the way it goes around the frame it looks to be too thin walled to.

It's marked 7/16" so should be the correct I/D.

Original road test etc. pictures in my copy of BSA & Triumph Triples Gold Portfolio shows the return from the oil cooler to the right of the fuel tank mount (as shown in the more recent examples, below).

[Linked Image from ogden_images.s3.amazonaws.com]
[Linked Image from collectingcars.imgix.net]
[Linked Image]

Last edited by L.A.B.; 11/24/21 11:15 am.
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I am away from home and my bikes at the moment for theThanksgiving holiday but when I return I will take a couple of photos of the pipe run on mine.
But my recollection is of an installation where it is certainly compact but doable without pipe twist and distortion.

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It could be that I have them routed backwards? I have the feed to the rockers before the oil goes through the cooler. From your pictures it seems the the kink in the line could only get worse with that line routed on the right side.
I used 7/16" oil line, maybe herringbone line is stiffer?


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Originally Posted by DavidP
It could be that I have them routed backwards? I have the feed to the rockers before the oil goes through the cooler.

A T150 factory manual drawing does show the scavenge with the rocker feed connected to the right-hand side of the cooler...

[Linked Image from i.postimg.cc]

...however, in section A8 of the same manual, it says, regarding the refitting of the oil cooler lines: "The left side union connects to the scavenge pipe, i.e. the pipe which connects to the metal rocker feed pipe union."

Pictures from road tests also show the rocker feed connected on the left-hand side which should be the engine to cooler line.
[Linked Image from i.postimg.cc]

Originally Posted by DavidP
From your pictures it seems the the kink in the line could only get worse with that line routed on the right side.
I used 7/16" oil line, maybe herringbone line is stiffer?


Yes, the original herringbone probably was stiffer.

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[Linked Image from i.imgur.com]


3D TV: A format that lost a format war without even having an opponent.
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DavidP Offline OP
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Originally Posted by L.A.B.
Originally Posted by DavidP
It could be that I have them routed backwards? I have the feed to the rockers before the oil goes through the cooler.

A T150 factory manual drawing does show the scavenge with the rocker feed connected to the right-hand side of the cooler...

[Linked Image from i.postimg.cc]


Yes, the original herringbone probably was stiffer.
That picture is how mine is now routed. I don't remember how it was before I replaced the lines, but I flushed the cooler when I replaced them. I don't guess that the flow direction through the cooler matters.


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In terms of cooling the direction of flow through the cooler does not matter.
However (and isn’t there always an however?) the internal passageways of the cooler on the oil side are very crowded with internal extended surfaces in the tubes so over a period of time (say 40-50 years?) the inlet side to these oil tubes become like a filter for any crap. If you then suddenly reverse the oil flow then the crap flows to the oil tank.
You can of course try to flush out the cooler by reverse flushing in the opposite direction to the original flow direction but it is difficult to be sure that you have removed all of the crap.
Better by far IMHO to pipe in the cooler so that the original flow direction through the cooler is maintained.
HTH


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