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Help! D-C Sabre with a seized prop spinner nut

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Old 12-06-2017, 07:43 PM
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Ultracon46
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Angry Help! D-C Sabre with a seized prop spinner nut

I have an old D-C Sabre 1.5 cc diesel I am trying to resurrect. Worst problem I have is the seized prop spinner nut. The engine comes with a red metal spinner which is the prop nut. It has a hole drilled through it so you can tighten and loosen it with a small metal rod. I used to use a small screwdriver with the head cut off. The darn thing seems welded to the crankshaft and when I turn it using a screwdriver it just turns the engine over. That sucker is tight! Can anyone give me some help on undoing this thing? Have tried a heat gun, Marvel Oil, 3-in-1, 10% nitro fuel, acetone and WD-40. All to no avail. Help!! Also in need of a needle, or an NVA. Lost the needle somewhere the last 50 years!
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Old 12-06-2017, 09:18 PM
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qazimoto
 
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Quote:
Originally Posted by Ultracon46 View Post
I have an old D-C Sabre 1.5 cc diesel I am trying to resurrect. Worst problem I have is the seized prop spinner nut. The engine comes with a red metal spinner which is the prop nut. It has a hole drilled through it so you can tighten and loosen it with a small metal rod. I used to use a small screwdriver with the head cut off. The darn thing seems welded to the crankshaft and when I turn it using a screwdriver it just turns the engine over. That sucker is tight! Can anyone give me some help on undoing this thing? Have tried a heat gun, Marvel Oil, 3-in-1, 10% nitro fuel, acetone and WD-40. All to no avail. Help!! Also in need of a needle, or an NVA. Lost the needle somewhere the last 50 years!
Can you remove the backplate, head, and rod/piston/liner?

If so it makes wedging a piece of wood between the crankpin and the crankcase easy. Place it in such a way that it prevents shaft rotation when you attempt to undo the spinner. Otherwise you can wedge the lower end of the rod using a piece of wood to resist rotation. Just a bit riskier.

Universal replacement NVA for small British Diesels appear from time to time on UK Ebay.
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Old 12-07-2017, 01:11 PM
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Ultracon46
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Many thanks Aussie! I am a former Kiwi. I have had the engine totally apart, and cleaned, except of course the crankshaft. I try your idea with a piece of wood today!
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Old 12-10-2017, 06:27 PM
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Ultracon46
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GOT THAT SPINNER OFF! Used the old seize up cure of a pot of boiling water. Stuck the engine in the pot with just the spinner immersed, jammed up the rear of the crank shaft, used a padded vise grip on the spinner and lo and behold!
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