[AT] Standard Ricardo Injection tubing

[James Peck]

Here is a case of a man working on the 23C high pressure fuel lines in a TO35. Looks like they are going with 8MM tubing. I wonder if the original tubing was 8MM or 5/16 (7.94MM).. The forum mentions compression fittings.

https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ferg&th=36379
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From: James Peck
Sent: Sunday, February 9, 2020 1:09 PM
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Subject: RE: [AT] Stadard Ricardo Injection tubing was Allis Chalmers ED40 injector pipes

You were correct Cecil. I have included the Parker fittings brochure again. Some of the steel fittings are rated to 2800 psi. Any  tubing or other component nneds to have a working pressure rating that excedds the injection pressure. All components in the high pressure injection side need to be rated above  the peak injection pressure. We have not been furnished the peak injection pressure. Without knowing the actual injection pressure, it is anybody's guess what pressure rating we need to selct for. Pressure rating of tubing ddepends on its wall thickness, diameter, matrial, and method of manufacture.  Parker does not sell the tubing. It comes from other venders. With tubing I believe you select it by OD and pressure rating.

Does John's friend know the injection pressure on a Standard Ricardo 23C engine?

Buying good shape injector tubes may not solve the problem if they have to be bent to clear the glow plugs. Is that the case with the ebay sourced tubes?

Not all fittings seal by drawing in a ferrule to the tubing.

https://www.iso.org/standard/70228.html ISO 8535-1:2016
Diesel engines — Steel tubes for high-pressure fuel injection pipes — Part 1: Requirements for seamless cold-drawn single-wall tubes

The standard may be more stringent than the OEM tube and fittings.

Even more reason to go with the injector repair shop.


Thomas Martin AT List Member (tmartin at xtra.co.nz);  Hi Cecil,  I was actually responding to James' post that referred to a reinforced nylon Parker product. There is no real substitute for injector pipes other than injector pipe "tube". Heavy wall as it is, one can still feel the pulse, by holding a pipe between fingers...

Cecil Bearden AT List member, Oklahoma farmer, and Professional Engineer (crbearden at copper.net); At the time I wrote this I was thinking hydraulic steel tubing.   Hydraulic tubing fittings have a ferrule that clamps down on the tubing when tightened the first time.     Most diesel tubing has the ferrule brazed on to the tubing.

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