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Coolspring Pennsylvania

Thermoils at Coolspring


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  #21  
Old 07-15-2009, 09:16:30 PM
Kirk Taylor Kirk Taylor is offline
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Default Re: Thermoils at Coolspring

Quote:
Originally Posted by John Cunningham View Post
I have to believe also there should be a spring but where did it go. There is no shoulder on the rod so did the spring go up against the point? Also there looks to be a sleeve for the metering rod in the body that looks frozen solid. The spring may have disintegrated from corrosion and then went down in the hole.
John,
I can't get the photos out of the camera until tomorrow.
Here are the measurements for the metering rod:

overall length - 3.717"
diameter of top segment - 0.499"
length of top segment - 1.650"
hole diameter; top - 0.312"
hole depth; top - 1.435"
diameter middle segment - 0.312
length of middle segment - 1.625"
diameter of bottom (metering) segment - 0.169
length of bottom segment - 0.442"

The bottom metering segment has a tapered flat milled onto one side which is what controls the amount of fuel. Clearance between the metering end and the seat must be at a minimum. If the rod end or seat has excessive wear (or rust damage), the fuel by-passes the end of the rod and cannot be properly metered. This tends to make the engine "hunt" severely and may run off.

The pin that operates the metering rod is 2.117" long and 0.070" in diameter in the center; it tapers slightly toward both ends.

When pushed to the bottom of the hole, the top of the metering rod is nearly flush with the top of the injector body.

You didn't say what size your engine was, but I assume it's either a six or a nine. The metering rod, I believe, is the same for both.

A word of advice from someone that's been there and back more than once...........take your time repairing the injector. I realize you're under the gun to get your engine running. Hvids are really cool and a pleasure to operate when they're right, but a less-than-perfect injector will create more headaches than you could imagine. On top of that, the smallest amount of dirt or rust in the fuel system will ruin your day.

Just a side note, the Brantford, Hoag, and Renfrew engines are the same. They were merely sold through different distributors.

Have a great time at your show!!

Kirk
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  #22  
Old 07-15-2009, 09:39:31 PM
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Elden DuRand Elden DuRand is offline
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Default Re: Thermoils at Coolspring

John:

I agree with Kirk. He knows what's inside that fuel block and I don't. I just designed and built one from scratch so I could use my imagination.

Be very careful in fixing the metering rod. If you mess up the casting, you will be a long time finding another one.

Take care - Elden
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  #23  
Old 07-15-2009, 09:50:29 PM
Kyle K Kyle K is offline
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Default Re: Thermoils at Coolspring

Hello John. Chief Hvid Technician Taylor is a wealth of information as you have just found out. Any chance of pictures? Kyle
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  #24  
Old 07-15-2009, 10:59:47 PM
John Cunningham John Cunningham is offline
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Default Re: Thermoils at Coolspring

Thank you Kirk.
This information is outstanding. Thread the bore and tap hammer it back out. Here I thought it was just a sleeve and it is the actual metering rod. Why is there so much corrosion each year? I use keroscene but did not think that would cause corrosion. I will follow your advice closely. I do not recall every having this metering rod out I am glad you know what is going on there to help me.
John Cunningham with a 6 HP Hoag in Prole Iowa.
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  #25  
Old 11-12-2009, 11:35:27 AM
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Denis Rouleau Denis Rouleau is offline
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Default Re: Thermoils at Coolspring

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Originally Posted by Kirk Taylor View Post
Just a side note, the Brantford, Hoag, and Renfrew engines are the same. They were merely sold through different distributors.
Here is a 1920 ad about Renfrew Coal oil engines.
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