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thread size for glow plugs?..o.s 91 surpass

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thread size for glow plugs?..o.s 91 surpass

Old 02-19-2005, 05:21 PM
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tukkus
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Default thread size for glow plugs?..o.s 91 surpass

i need to rethread for the glowplug and i was wondering if anyone knows the size of the tap i need...i don't even know if it is metric or standard, i'm sure it's metric but i really don't know
Old 02-19-2005, 05:52 PM
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Default RE: thread size for glow plugs?..o.s 91 surpass

Glow plug threads are 1/4 X 32 which is a special American thread size. Harry Higgly has the taps available because they are almost impossible to find using the usual hardware sources.
Old 02-19-2005, 08:02 PM
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Default RE: thread size for glow plugs?..o.s 91 surpass

I'm pretty sure Tower has a tap for that.
Old 02-19-2005, 08:05 PM
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Default RE: thread size for glow plugs?..o.s 91 surpass

Tower Hobbies have these taps and dies. I have both of these, I use the die most often to ensure that the plug thread is true and won't cause problems when installed in the engine. Sometimes a new glow plug will have a rough spot that can cause problems when installing, screwing it into a die will correct this and reduce problems with ruined glow plug threads.
Old 02-20-2005, 01:02 AM
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Default RE: thread size for glow plugs?..o.s 91 surpass

If the threads are ruined Clarance Lee in California can install a heli-coil in the head if it is sent to him. He advertises in the classified in RCM every month.
Old 02-20-2005, 01:19 AM
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Default RE: thread size for glow plugs?..o.s 91 surpass

why not just buy a new plug or head ?
Old 02-20-2005, 09:05 AM
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Default RE: thread size for glow plugs?..o.s 91 surpass

Four Stroke heads are NOT cheap.
Old 02-20-2005, 11:28 AM
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Default RE: thread size for glow plugs?..o.s 91 surpass

You can probably buy a new magnum engines head for less than the cost of sending it off and having a heli-coil installed.

I don't know about re-tapping it as the glow plug hole is probably oversized as a consequence of stripping it out.

doubledee
Old 02-20-2005, 05:09 PM
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Default RE: thread size for glow plugs?..o.s 91 surpass

Four Stroke heads are NOT cheap.
Not to argue with you but an engine of that status , it may be better of bying the head new to avoyed more damage and prevent a crash. I had to by a new head for my OS .40LA because it wasn't seatting right after a crash and the engine would keep running even with the carb closed. Good luck.
Old 02-20-2005, 10:25 PM
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Default RE: thread size for glow plugs?..o.s 91 surpass

The heli-coils used to repair stripped threads are MUCH cheaper. I repair stripped glow plug threads for $10.

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