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RE: Stripped threads on OS 46AX Engine Head - 12/3/2012 11:21 PM   
aspeed


 

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From: Ruthven, ON, CANADA
Status: offline 		I never had much luck recutting stripped threads.  A rolform tap can sometimes mush the aluminum back in place, but a cutting tap will only make a chip which is really removing more material making things worse. Probably see you tomorrow Dennis if you are doing the indoor thing.

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 12:12 AM   
MetallicaJunkie



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quote:

ORIGINAL: CrashedTrainer

@wcmorrison: No... i know i didn't cross thread it... it was over torqued for sure, excessively... as aspeed said.. i have learned my lesson too, the hard way... i think the poor engine head tried to cope up as much as it could but gave up in the end... anyways

@metallicajunkie: thanks... i would most definitely want to get it from you but it would cost me a fortune, i think, to get it shipped here to Pakistan all the way from the US? :/



ohhh sorry... i didnt realize you lived outside the USA..... i was gonna let you have it for 10 shipped

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 12:19 AM   
oneaew@msn.com


 

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Status: online 		i tighten my plugs finger tight no trouble and a new washer each time

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 12:20 AM   
oneaew@msn.com


 

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Status: online 		GO FOR A NEW HEAD THEEN YOU WONT HAVE ANY TROUBLE

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 1:32 AM   
GTMUSTANGCS



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Status: offline 		I use a nut driver and two fingers to tighten glow plugs.

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 4:45 AM   
drac1


 

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Status: offline 		If Heli coils are readily available, then that is the way to go. Do not use a insert pressed into the head. It needs to be threaded so it will not move or come out. A Heli coil self locks once it is in. It is also much stronger than the aluminium so you won't have the same problem again.

When you fit the plug, once it bottoms out just a slight nip is all that is required.

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 12:33 PM   
on_your_six


 

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Status: offline 		You guys are incredible... you will spend $20 for a helicoil to fix a part that costs $20. Le't see... I would like a repaired part more than a brand new one NOT.

If the cost of a repair is more than one-half the cost of the brand new part... I will take the new part every time, no question. My time is worth something. Dealing with repaired junk is no picnic. I want value for my dollar spent.

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 1:09 PM   
drac1


 

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quote:

ORIGINAL: on_your_six

You guys are incredible... you will spend $20 for a helicoil to fix a part that costs $20. Le't see... I would like a repaired part more than a brand new one NOT.

If the cost of a repair is more than one-half the cost of the brand new part... I will take the new part every time, no question. My time is worth something. Dealing with repaired junk is no picnic. I want value for my dollar spent.

An earlier post said they could have the repair done for 5 or 6 dollars. If that is the case, then that would be the way to go.
As for repaired junk, if their is nothing else wrong with the head then that is money well spent. A stainless steel heli coil in a aluminium head is far better than screwing into aluminium.
IMO that should be done as a part of the manufacturing process.
It would take me no more than ten minutes to heli coil a head. That is time well spent.

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 4:38 PM   
Propworn


 

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Status: offline 		Buying a helicoil kit for single use may not be cost effective if the original part is readily available and inexpensive. I originally purchased mine to repair a cylinder head on a friends OPS boat motor. The OPS like the EEEEEENNNNNYYYYYYAAAAA are engines from a bygone era so any kind of support in the new world is hard to come by. Since the original purchase I have used the helicoil kit time and time again so it has paid for itself. Some confidence with a tap and sizing the length of the helicoil is necessary, though not that difficult if careless one can screw up a head beyond repair.

Dennis

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 4:47 PM   
Propworn


 

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Status: offline 		I used to think when someone said EEEEENNNNNYYYYYYAAAAA they were referring to braying of wild horses however after observing the fractured finger dance at the field I came to realize it really meant “BAD JU JU”

I digress back to the topic at hand. If you purchase by chance a helicoil kit and learn to install it properly you may become everyone’s new best friend. All kidding aside it’s great to be able to help your friends out if you have the opportunity.

Dennis

< Message edited by Propworn -- 12/5/2012 11:50 PM >

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 5:02 PM   
mscic-RCU



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Status: offline 		Throw away the cross shaped driver and get a regular nut driver. It will keep you from over-tightening the glow plug

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 5:50 PM   
captinjohn


 

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Status: online 		Talking about cylinder heads, I bought a .90 Supertiger at a yardsale for a good price. It is like new...but the head was missing. I would like to find a good used one.  Thanks   Capt,n

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 9:21 PM   
Sport_Pilot



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Status: offline 		I think the heli coil cost more than $7 bucks, even more than the $20 Mr. Lee asks.  Mostly because of the special size and small volume.  So is this repair a heli coil or just retapping the head.  If it is the latter don't do it.  But $7 for a heli coil is a steal.  And a heli coiled head is much better than a new non heli coiled head.

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RE: Stripped threads on OS 46AX Engine Head - 12/4/2012 11:50 PM   
jp1961


 

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Status: offline 		I would say if you can get the head new, then replace it. I'd use a Helicoil on a head that's no longer available. I have a Bridgeport and could make this repair in 15 minutes, however I've never been able to find 1/4-32 helicoils. Not sure if they only supply them to Clarence Lee.

Jeff

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 12:26 AM   
Propworn


 

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Status: offline 		http://www.blindrivetsupply.com/Recoil-14-32-UNEF-Thread-Repair-Kit-10-Inserts-In-Kit-34040-32_p_3626.html




quote:

ORIGINAL: jp1961

I would say if you can get the head new, then replace it. I'd use a Helicoil on a head that's no longer available. I have a Bridgeport and could make this repair in 15 minutes, however I've never been able to find 1/4-32 helicoils. Not sure if they only supply them to Clarence Lee.

Jeff



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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 2:51 AM   
aspeed


 

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$ 0.68 each, and 10 min.  $3 each if you need to buy the installation kit to do 10.  If you do 2 heads, the kit has paid for itself.  I bought the Turbo tap, so the smaller motors may work better.  I have to make the whole head on some motors, but it's a hobby, right?  In most cases, a helicoil is considered an upgrade.  For a head, I think there is a chance of leakage because there is a possibility of leaking at two threads.  The other brand insert with a shoulder looked better to me, or a Nelson plug mod. if a new head isn't made or purchased.   A Turbo or Nelson style head will give an increase in performance which is always a good thing.



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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 4:22 AM   
Ernie Misner



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Status: offline 		>>> As Clarence Lee said 40 years ago. Get a 1/4-32 die and clean up the threads of each new glow plug before using >>>

+1 - Clarence Lee repeated that in his Engine Clilnic article not too long ago. He said the glow plug threads are rolled instead of cut and they need to be cleaned up. If not, when you tighten the plug. there will be 'too tight' spots. Those tight spots tend to weld themselves to the aluminum in the head if you have a hot run. Then when you pull the plug out the next time, bingo, out comes the threads with it. I did get myself a die and ran every old plug I had through it. Not to worry, it didn't take excess material off leaving the plug loose in the head. It just cleaned the high spots off of the threads real nice. I'm sold.

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 4:56 AM   
drac1


 

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Status: offline 		I have never had a problem with tight or binding glow plugs during 16 years of flying. I have never stripped a thread either. I find that a couple of drops of oil on the thread to lubricate is all that is required. A slight nip once the plug has bottomed and all is good.
Most people generally over tighten most bolts. They don't need to be as tight as you would think.

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 2:31 PM   
CrashedTrainer


 

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Status: offline 		Got the head back after the repairs...the guy inserted a brass bush with threads inside of it...it doesn't look like a very neat job but i am hopeful that it will do the trick, lets see ... otherwise i will have to get a new engine head... :/


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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 2:57 PM   
aspeed


 

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Status: offline 		Looks like it should work.  It is fairly flush on the inside from what I can see on the pic.  If the plug is flush on the bottom of the inside, and it doesn't leak, then you are better than new.

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 3:43 PM   
drac1


 

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Status: offline 		Looks like corrosion around the insert? If it is, I don't know how successful the repair woul be.

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 4:10 PM   
aspeed


 

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Status: offline 		Likely loctite, or epoxy.  It is a different country, who knows what they have over there for brand names.

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 4:34 PM   
CrashedTrainer


 

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Status: offline 		yeah...that is some sort of epoxy... it is not corrosion that i can tell you...

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 5:11 PM   
drac1


 

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Status: offline 		It will be interesting to see how the epoxy copes with the heat. Keep us informed.

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RE: Stripped threads on OS 46AX Engine Head - 12/5/2012 5:48 PM   
Mr Cox



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Status: offline 		Looks like you'll a long reach plug now, instead of the medium reach OS plugs.

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