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TR2/3/3A TR3 capilary tube

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M

mallard

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What diameter should the three loops be on the capillary tube in front of the firewall?
 
Geo Hahn said:
Based on something I read somewhere -- I used a little (single serving) V-8 can.
Click to expand...

That sounds pretty close. Here's the car I went off of - from the 2010 TRA.

9119671357_4abf48db4c_b.jpg


9121896880_9dcaa3db09_b.jpg
 
I'm sure you're familiar with this illustration:

capillarytube_zps2bf4ce08.jpg


What the V-8 wrap produced. Though this is incorrect in many ways, I think the diameter of the loops looks about right.

CapillaryTube_zpsf3cc1e10.jpg
 
The 1954 service bulletin gives the spec for the coils as 1.5" Diameter approximate. Seemed a bit tight, so I think I went for about 2"...looked "approximate" to me!?!

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I personally don't like the capillary tube to be coiled in the engine compartment since the coils end up right over the top of the fuel pump. That makes it very difficult to get to the fuel pump if it needs to be replaced. I believe on the TR3A, the book shows the capillary coiled twice around the heater and not coiled at all in the engine compartment.
Regards,
Bob
 
Geo Hahn said:
Based on something I read somewhere -- I used a little (single serving) V-8 can.
Click to expand...

Oops -- was just over at a friend's house working on an XK and saw some V8 in his fridge... the cans are more like 12oz Coke cans now. The V8 can I used was much smaller (similar to the tomato paste can mentioned).
 
TuffTR250 said:
I personally don't like the capillary tube to be coiled in the engine compartment since the coils end up right over the top of the fuel pump. That makes it very difficult to get to the fuel pump if it needs to be replaced. I believe on the TR3A, the book shows the capillary coiled twice around the heater and not coiled at all in the engine compartment.
Regards,
Bob
Click to expand...

The reason for the coils are to absorb the relative motion between the engine and body without fatiguing, and eventually breaking, the capillary. You could get away with moving them around, as long as they are still between engine and body, but they don't help inside the cabin.
 
John that's the diagram I was looking for, thank you. Also thanks for the ideas and pictures they all help.
 
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