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Economy 1 1/2 engine head threads


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  #1  
Old 07-09-2019, 11:18:44 PM
VicF VicF is offline
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Default Economy 1 1/2 engine head threads

Hi, I had purchased a new head for my Economy 1 1/2hp E engine as the old one had a broken valve guide. I couldn’t get the exhaust or carb to thread all the way so I purchased a 3/4 NPT tap and a 1” NPT tap. The exhaust threads cleaned up just fine but I can’t get 3/4” tap past half an inch before it won’t really budge. I don’t want to force it to much. Any suggestions want to do here?
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Old 07-10-2019, 06:15:53 AM
26kracing 26kracing is offline
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Default Re: Economy 1 1/2 engine head threads

they don't thread in all the way
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Old 07-10-2019, 07:54:56 AM
VicF VicF is offline
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Default Re: Economy 1 1/2 engine head threads

On the old head they did.
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Old 07-10-2019, 11:19:41 AM
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Joel Mosley Joel Mosley is offline
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Default Re: Economy 1 1/2 engine head threads

Pipe threads are a taper fit to lock in place and seal. If you bottom the tap out, If the carburetor and street ell for the muffler bottom out, you have defeated the mechanical purpose of the pipe thread design.

I am sure the quality control was not that great on these tapped holes on the head so there was quite a bit of variation. As long as they thread in and get snug, you should be fine.
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Old 07-10-2019, 11:28:49 AM
Heins Heins is offline
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Default Re: Economy 1 1/2 engine head threads

If it is a NPT it should go in more than 1/2". Can you see threads that go in more than 1/2"?
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Old 07-10-2019, 02:18:23 PM
Skip Landis Skip Landis is offline
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Default Re: Economy 1 1/2 engine head threads

I believe the pipe nipple was cast in when they poured the head, so the metal beyond the nipple is likely hard from the process .
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