Construction and other equipment - Injection Line Sealing Washers:

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Injection Line Sealing Washers:

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=188229
Printed Date: 27 Nov 2024 at 6:25pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Injection Line Sealing Washers:

Posted By: Codger
Subject: Injection Line Sealing Washers:
Date Posted: 13 May 2022 at 6:52am

On my 11B series tractor with a DC series Roosa-Master pump, I have a consistent line to pump connection leak on the #1 cylinder fuel pipe. There is no compromise to the fitting or it's mechanical connection to the line, banjo bolt, or threads in the hydraulic head I can see, but this damned thing refuses to not drip fuel. The pump is rebuilt and was put back on the engine with everything torqued proper according to specs. This leak is at the seal between the Banjo bolt head underside, and the injection line seal where the banjo bolt passes through to the hydraulic head. It does not leak where the seal between the line and hydraulic head compress together.

I've used two different types of seals which are Stanadyne parts and am ready to try the copper variant this go round. The originals were steel, but it never leaked fuel prior to the pump being sent in for rebuild. I have looked closely at the area of the injection line where the banjo bolt sealing washers sandwich against, and cannot see anything that would preclude a seal. As a start, I'm going to install a new banjo bolt the pump shop has readily available.

Regardless, this thing is either a "drip" of fuel, or a thin pencil stream spray and neither is tolerable. Wanting to bring the tractor home in the next couple of weeks and get to working with it.

Replies:

Posted By: steve(ill)
Date Posted: 13 May 2022 at 9:02am

We always used copper washers because the are SOFT and will squeeze a little.. Not steel.... One trick when the copper got HARD due to cold working them, was to heat them up with a torch and let them cool to anneal.... Not that you need that, but the idea was to make them SOFT.... and we would polish the banjo fitting and face flat by rubbing on a fine sandpaper on the table... if needed.

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Like them all, but love the "B"s.

Posted By: Tad Wicks
Date Posted: 13 May 2022 at 10:31am

Be very sure what ever you do, there has to be a washer top and bottom of the banjo, if not, the bolt will screw in to far and distort the the head and the rotor will seize and twist off the pump drive shaft. Ask me how I know.

Posted By: Codger
Date Posted: 13 May 2022 at 6:59pm

This was the first pump setup I'd seen the steel washers used in. I maintained standby generator sets for many years and they were always "dead soft" copper washers in the application. Never were reused and really don't remember any leakage from these at all.

I called the pump shop and asked about which was better and the gent said he sends both types out with rebuilt pumps so I discern it's personal preference in a lot of uses? Five of the six are sealed but the #1 cylinder line is giving fits. Torque is proper @ 420 inch pounds with a calibrated wrench/tool. As we mentioned I'm going to remove the line and "polish" the sealing surfaces of the banjo fitting. I know they've not been off the engine through several iterations of the pump being on, and off the engine. Twice they rolled the front drive seals not having the correct tool..... No damage to the engine fortunately as it was noticed to be making oil.

Posted By: Codger
Date Posted: 17 May 2022 at 7:13am

The banjo fitting to the steel line solder joint is compromised. Whether this is a resultant of being roughhoused, or a normal broken part from continuous vibration I cannot ascertain, but I called down for a replacement line to be sent me. I picked up new sealing washers yesterday but discovered a "trace" where fuel spray originated and getting a close look with a magnifying glass revealed a small break in this interconnection. I assume the connection is silver soldered but regardless I'll replace the line itself from a donor tractor.

Posted By: Codger
Date Posted: 19 May 2022 at 5:33am

Complete injection line set and injectors are shipping today. I'll send the injectors to the fuel shop for testing and calibration keeping for ready spares.

Posted By: Codger
Date Posted: 24 May 2022 at 6:59pm

My wife dropped everthing at the injection shop today. Should know how everything tests later in the week.

Posted By: Codger
Date Posted: 25 May 2022 at 8:17am

Injection lines all test good. Injectors themselves can be calibrated to spec but are going to be rebuilt. Not that many hours on them I'm told but for ready spares they need to be ready to go. He has not ran the pump yet and it will be calibrated with the injectors so they flow/deliver match up.

I'll try to get the line set picked up today and possibly installed. The tractor is coming home on the 8th, or 9th of June with a buddy's trailer so need to get this wrapped up and ready.

Posted By: Codger
Date Posted: 26 May 2022 at 7:13pm

Picked up the pump and injectors today. Just a simple test run and calibration was all that was required. The "updates" have already been done so I got out of there for $59.00 which covered the consumables used, and sealing washers needed.