Marks Holt 75

[dnalot]

While waiting for material for the water pump I have been making the water manifolds. I started by turning the flanges on the lathe. From there I moved them to my cnc router and cut the flanges to shape. After that I drilled the screw holes in the flanges. And the last step was using the mill to cut the relief for the ferrule.

I used a high temp silver solder paste for mounting the ferrule to the flange. This was my first time using a paste, I think it will be my go-to for small parts from now on. I made a sheet metal shield to protect the engine while I soldered the assembly together. I drilled through the flange assembly into the tube as the last step.

To complete the cooling system I still need to build the water pump. I have bearings, some o-rings for the belt drive and a bit of aluminum on order.

Mark T

 

[kuhncw]

Nice work. Your soldering heat shield is an interesting idea.

Chuck

 

[Robert Ritchie]

There you go again, hitting the target on the water manifold! Thanks for the update post, full speed ahead.

 

[dnalot]

The water pump is completed and mounted. I still need to make a water line to connect it to the radiator, and the pulleys that will drive the pump. I will make the pulleys when I make the pulleys for the fan.

Mark T

 

[kvom]

Nice job on the soldering.

 

[Robert Ritchie]

As always great job!

 

[dnalot]

With this post the cooling system is completed. I deviated from the plan a little in that the fan support legs were meant to be cut from a single piece of material. I didn't have a suitable piece of aluminum that size so I made my legs in two pieces and modified the bearing housing to accommodate that change. I also made the legs a bit heaver because I plan to mount the fuel tank to the fan support structure. The fan pulleys are a bit larger to accommodate the o-rings I had on hand.

For those following along and leaving a comment I thank you.

Next I will be starting the fuel system . Its summer here and I am not spending much time in the shop. The novelty of nice weather will soon wear off and I will get back to it.

Mark T

 

[CFLBob]

You, sir, are an artist.

 

[dnalot]

You, sir, are an artist.

I think you have me confused with my brother Ben, he is the artist of the family.

 

[CFLBob]

He just works with a different medium and different tools.

 

[awake]

Which one of those three is Ben??

 

[Richard Hed]

I think you have me confused with my brother Ben, he is the artist of the family.

View attachment 118274

OMG, you are from the "Soviet"! I grew up in Yelm, went to high school at Toutle Lake! Am now in Moses Lake.

Both you and ur bro are artistes! Good works.

 

[dnalot]

OMG, you are from the "Soviet"! I grew up in Yelm, went to high school at Toutle Lake! Am now in Moses Lake

I don't know what you mean by the Soviet. Moses Lake, now that is a bleak place. What are you doing there, watching the 737 Max planes arrive for storage. A few years back I owned a 200 acre wild life preserve in the Moses Coulee. A nice place for rattle snakes to thrive. Every summer I hosted students from a variety of Collages to study snakes, badgers, bats and other critters. Sold the place to the "Nature Preserve", it was a sad day.

Mark T

 

[dnalot]

Which one of those three is Ben??

Well he isn't much like a sea lion or a bear or a native american. He can be a bit of an ass so its probably the wales tail at the bottom.

Mark T

 

[Richard Hed]

I don't know what you mean by the Soviet. Moses Lake, now that is a bleak place. What are you doing there, watching the 737 Max planes arrive for storage. A few years back I owned a 200 acre wild life preserve in the Moses Coulee. A nice place for rattle snakes to thrive. Every summer I hosted students from a variety of Collages to study snakes, badgers, bats and other critters. Sold the place to the "Nature Preserve", it was a sad day.

Mark T

Washington is so liberal that it must be a soviet. don't gets me wrong--I too am a liberal but just not one who believes in velvet gloved stalinism.

 

[Robert Ritchie]

Full speed ahead Mark great work!

 

[dnalot]

So here is the carburetor. Made from brass with a .031” dia. Sewing needle. Fussy little thing to make, tiny little drills and close fitting parts. After assembling I attached a fuel line and put the end of it in a cup of water to test it using an air hose to blow air through the venturi. A nice atomized mist of air indicates it is working. Finished the body off with nickle plating on a matte surface.

Next is the fuel tank and the sediment bowl.

Mark T

 

[awake]

Very nice! What plans are you using for this carb?

 

[dnalot]

Very nice! What plans are you using for this carb?

Hi Andy. It was included in the plan set for the Holt 75. The tricky part was finding a .031" needle. I had to wait for my wife to leave the house so I could search her sewing room. It was kind of exhilarating risking my life like that.

Mark

 

[awake]

But the danger is not past. One of these days, she's going to be asking what happened to the needle that she KNOWS she had, right there ...