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September 23, 2014, 02:32:08 PM

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Author Topic: Decompressor woes  (Read 1138 times)

Mr.Mazza

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Re: Decompressor woes
« Reply #15 on: April 22, 2014, 09:24:40 PM »
Heli-coil it with the head in place.  ERC

Thanks for the help guys, I have no time to do this kinda work before the weekend nor do I trust myself with it after what I did, this is a call in job, lucky there is a few mobile bike mechanics that should be able to fix the thread and make it all work pretty cheap.
Lizzy - 07 500 Deluxe ES - Red and chrome

solg

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Re: Decompressor woes
« Reply #16 on: April 22, 2014, 10:54:19 PM »
this is what I used in place of the OEM decomp thinggie. I bored & tapped a decomp plug I got from Nfeld to fit the decamp button I picked up online. it works great! I put a silicone nipple on the end of the button to keep from burning my phalange!
« Last Edit: April 22, 2014, 10:59:31 PM by solg »
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Mr.Mazza

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Re: Decompressor woes
« Reply #17 on: April 23, 2014, 12:12:57 AM »
Looks great, but I'm not too sure about having the heads thread tapped, wouldnt the metal shavings fall in and end up scoring?
Lizzy - 07 500 Deluxe ES - Red and chrome

Arizoni

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Re: Decompressor woes
« Reply #18 on: April 23, 2014, 01:38:57 AM »
If the threads are truly stripped out the remaining hole will be just about perfect for the Heli-coil tap.  There will be no need for drilling the hole larger.

Some people will insert a long piece of rag down thru the hole to serve as a chip collector  After the threads are cut, snagging the rag with a hooked wire and pulling it back out will remove most of the chips.
Others will just apply a thick coating of grease to the flutes of the Heli-coil tap before running it into the hole to keep the chips from falling into the cylinder.  If this method is used the tap will need to be backed out about every 2-3 turns so the chips can be wiped off and a new layer of grease applied.

In any case, yes, a few chips may find their way into the cylinder but they are aluminum.  The bore and piston rings are steel so the aluminum chips won't damage them.
About the worst thing that might happen is a chip might get wedged between a valve and it's seat.
If this happens, usually the valve will soon cut thru the offending piece and it will be blown out the exhaust along with any other loose aluminum chips.

Most Heli-coils have a driving tang at the bottom to serve to drive the Heli-coil into the threaded hole.
This tang needs to be broken off once the insert is in place.
Because the tang is steel it could cause a problem if it falls into the cylinder so be very careful at this stage.

If the rag was left in the hole until after the tang is broken off, the tang will probably be caught by the rag and removed when it is pulled out.



Jim
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cafeman

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Re: Decompressor woes
« Reply #19 on: April 23, 2014, 02:45:26 AM »
Use a shop vac while you run in the tap in small increments. It'll suck the shavings out in most cases.  ;)

REpozer

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Re: Decompressor woes
« Reply #20 on: April 23, 2014, 05:05:46 AM »
fill the bore with shaving cream . Never thought of using a shop vac. Maybe try both.
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cafeman

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Re: Decompressor woes
« Reply #21 on: April 23, 2014, 12:17:46 PM »
.     
fill the bore with shaving cream . Never thought of using a shop vac. Maybe try both.
.        Barbersol? Gillette With lanolin?  Foam....edge....foam.....edge..
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ace.cafe

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Re: Decompressor woes
« Reply #22 on: April 23, 2014, 12:24:02 PM »
I would just take the head off.
No big deal.
Besides, it's good to take the head off periodically, and it doesn't get so stuck and hard to get off if you do that. If you never take it off, it can be a real bitch when you finally have to do it.
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devon john

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Re: Decompressor woes
« Reply #23 on: April 23, 2014, 02:32:15 PM »
as its got two holes  spark plug and decompressor , get the engine at T,D,C on compression take out the spark plug .
now you will need a air compressor and the helicoil  kit and goggles, put the air in the spark plug hole
and tap the thread.
this should stop all swarf getting in the engine.BUT  WEAR THE GOGGLES

Blltrdr

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Re: Decompressor woes
« Reply #24 on: April 23, 2014, 02:54:42 PM »
I like Aces answer best.
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Mr.Mazza

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Re: Decompressor woes
« Reply #25 on: April 23, 2014, 09:24:45 PM »
Head off = new gasket, it'll take just under a month for any sort of parts to arrive.
Lizzy - 07 500 Deluxe ES - Red and chrome

REpozer

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Re: Decompressor woes
« Reply #26 on: April 23, 2014, 10:18:59 PM »
.        Barbersol? Gillette With lanolin?  Foam....edge....foam.....edge..
  :o
cheap foaming kind. No gel .....pleez :P
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RE_Chief

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Re: Decompressor woes
« Reply #27 on: April 23, 2014, 10:33:50 PM »
What do you need Mazza I have a few gaskets lying around, happy to give you one.  Also you can get parts pretty quickly from Graham at http://www.royalenfieldaustralia.com/spare_parts.php

Regards Charles
1955 Indian Tomahawk 500 twin
1960 Indian Chief 700 twin
1964 Interceptor Mk1 750 twin
1967 Interceptor Mk1A 750 twin
1994 Bullet Deluxe 570 long stroke single

Mr.Mazza

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Re: Decompressor woes
« Reply #28 on: April 23, 2014, 11:44:01 PM »
What do you need Mazza I have a few gaskets lying around, happy to give you one.  Also you can get parts pretty quickly from Graham at http://www.royalenfieldaustralia.com/spare_parts.php

Regards Charles

Well if the head comes off I'm gonna need a head gasket, im calling this one in so itd be cheaper and easier if he doesnt take the head off.
Lizzy - 07 500 Deluxe ES - Red and chrome

RE_Chief

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Re: Decompressor woes
« Reply #29 on: April 24, 2014, 08:37:48 AM »
If the head comes off make sure that whoever you are getting to put it on does not over tighten the head nuts.  You don't need much more than 20lb/ft, if they get over tightened they can strip out so be careful.

If you came along to the Club meeting next Tuesday chances are some one could help you for free and is likely to know more about these machines than any Jappa mechanic.  Of course there is a small annual fee of $35 to join the Club but probably cheaper than RACV.  Come along to the meeting anyway, no need to be a member, just to meet a bunch of other Enfield riders, its always a hoot.

Regards Charles
1955 Indian Tomahawk 500 twin
1960 Indian Chief 700 twin
1964 Interceptor Mk1 750 twin
1967 Interceptor Mk1A 750 twin
1994 Bullet Deluxe 570 long stroke single