1921 X5 Two Ton Project

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  • April 3, 2017 at 2:27 pm #404429
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    I had initially thought the lever had a set screw, but after drilling down to what I thought was deep enough the lever still wouldn’t come loose. A look in the parts book showed the screw goes all the way through the shaft and back into the lever.

    April 3, 2017 at 2:29 pm #404430
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    Bent fingers

    April 3, 2017 at 3:08 pm #404432
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    Looks like that switch got man handled a few times.

    You’re going above and beyond with this project.

    Keep the photos and updates coming. :)

    April 5, 2017 at 11:48 am #413151
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    Very thorough and high quality work William !!

    I have my 1919 Series31 dual-valve engine apart for rings, rods and valve job. I did not have any cracking in the exhaust ports or cylinders like your engine showed, but your valve seats look WONDERFUL compared to mine.. How my engine escaped cracking is miraculous. I think it might be that the very small water passageway between the valve ports was open, not corroded shut.

    But, my valve seats in the block are severely worn, recessed and corroded. The work performing a good valve job is going to be extensive.. but worth it in the end,, this car ran amazingly well despite having several cylinders with only 20psi compression, and .006-.009″ oil clearance in the connecting rod bearings, [supposed to be .001″ ]

    So I’m really looking forward to having the freshened engine back in service..

    Here is an image of one of my worst valve seats. I don’t know if your engine had had several valve jobs, resulting in your much deeper-in-the-block valve seats, or if that was the intended seat for that engine.

    Greg Long

    April 16, 2017 at 6:55 pm #404568
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    Greg, Your seats do look much shallower. I don’t think the truck had many valve jobs, if any, so they must have been made like that. Imagine how well it will run after the engine work!

    The cab is pretty much all screwed together. I still need to make the seat lids and neaten up a few things.

    April 16, 2017 at 6:56 pm #404569
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    The next job will be framing up the seat box and finishing the ignition switch.

    April 17, 2017 at 3:56 pm #404573
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    One question: what is the normal compression pressure for this engine? Is it a Series 80 engine, a derivative, or a completely different engine.

    April 17, 2017 at 5:43 pm #404574
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    Both the series 80 and the Series 31 [my 1919] and the Series 33/36 engines had roughly 4.5:1 compression ratio. So 4.5x15psi [at sea level = 67.5psi. if the cylinder, rings, valves are perfect, and the intake stroke is un restricted and fills the cylinder completely. this is unlikely.

    Most S80 engines will have 60-65psi compression.

    I think one of my cylinders in my 1919 had 60, the rest were considerably lower. This was easy to explain once the engine was apart and inspected.

    Greg

    May 23, 2017 at 4:17 pm #404717
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    I’ve been working on lots of small things here and there. Went to the Luray swap meet this past weekend. I didn’t find any Dodge Brothers or P-A truck parts, but it was a good meet like always.

    I started repairing the cab sheet metal where it had been cut, and got into the bellhousing and clutch assembly.

    May 23, 2017 at 4:19 pm #404718
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    What I call the springs of death, were removed with the press. Three of these springs are what apply tension to the plates.

    May 24, 2017 at 6:33 pm #404725
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    That spring looks like it belongs inside the fork tube on a motorcycle.

    I bet that is under a lot pressure when it is compressed.

    Thanks for the updates.

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