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Old 08-21-2019, 05:43 AM
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I did too, until I started to use red Loctite, and running the top of helicoil about a 1/2 -3/4 of a turn down past the top of the aluminum thread.That way you don't give the coil anywhere to start to come out.
You idea sounds good,that way when your tighten down on the plug your actually putting the pressure on the adapter and not the aluminum threads.
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Old 08-21-2019, 09:41 AM
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Quote:
Originally Posted by RCEXTREMEPOWER View Post
I would not use a helicoil
I would tap and thread for 14mm plug and use a 14mm to 10 mm plug adapter.

Every time I try to use a helicoil they come out.???

Milton
agreed. I like Time Certs however they are not easy to find. I have a 10x1.0 Time Cert kit but I don't have any shallow inserts. I'll keep looking
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Old 08-21-2019, 09:44 AM
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I found several kits, 13.5, 15 and 16 mm in length, those are probably too long?
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Old 08-21-2019, 09:49 AM
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Install a timesert. Best thread repair Ive used in my engine shop.
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Old 08-21-2019, 12:56 PM
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Properly installed helicoil will outlive the engine. It’s better than stock threads by a mile. Timesert is the best but may not be available in this size.
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Old 08-21-2019, 01:35 PM
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Because of the counterbore the Timeserts use, I’m not sure the small sealing washer used on the CM-6 plug would seal properly to the cylinder head. The Timesert kit is fairly expensive.
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Old 08-27-2019, 11:07 AM
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Quote:
Originally Posted by Truckracer View Post
Because of the counterbore the Timeserts use, Iím not sure the small sealing washer used on the CM-6 plug would seal properly to the cylinder head. The Timesert kit is fairly expensive.
If you put the counterbore in a hand drill I absolutely agree but if you measure the head of the timecert and use a drill press or mill, you can very accurately install them so it is totally flush with the casting.
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Old 08-27-2019, 11:31 AM
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Quote:
Originally Posted by Muttdog View Post
If you put the counterbore in a hand drill I absolutely agree but if you measure the head of the timecert and use a drill press or mill, you can very accurately install them so it is totally flush with the casting.
👍. That might be beyond the scope of the average RCer though.
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Old 08-27-2019, 02:36 PM
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Time Certs are out of most modelers scope anyway, that is why most people here are recommending Heli coils but your point is valid. I have used heli coils but on such a shallow depth thread, there can be issues especially for the novice installer. I have offered to install Time Certs for FG members in the past and am still happy to do it. While I still have the tools, I am out of the inserts and they are not as easy to get with the new job.
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Old 08-27-2019, 03:48 PM
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Since the insert and the head are different materials, and they expand differently with temperature, I would look at any kind of insert with skepticism in this application . I do not have experience as Truckracer and Muttdog have in this area, so I speak from a certain amount of ignorance.

Inserts work very well in many and most applications and probably this one. The cost of an insert kit is around $60 .

The cost of a new head may be $100. Is the reduced chance of failure and potential loss of the model worth the extra $40?

I think it is. My skepticism tells me to go with a new head.

Just checked...a DLE111 head is $75. It is not worth repairing in my opinion.
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Last edited by ChemE; 08-27-2019 at 04:16 PM. Reason: correction
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Old 08-27-2019, 04:21 PM
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You bring up a point that I forgot to mention.I have one of the newer EME60's with a steel insert for the plug.At first it was fine but after just a few flights it started to come loose.First leaking between the insert and aluminum.Then to the point where you could move it and loosing compression to the point it wouldn't start.MileHigh just sent me a older cylinder without the insert at my request.Time Certs probably wouldn't have this problem,I never used one so can't say one way or another.Never stripped a plug thread but have used Helicoils a few times on muffler threads on the cylinder,never a problem yet.
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Old 08-27-2019, 07:12 PM
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I tend to use Timeserts , work Great and feel that they are a better option than a helicoil .
Just my $.02 and experience
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