BMW R25/0 - Rethread spark plug thread - Experience 2
- +

BMW Einzylinder-Forum

Bitte loggen sie sich ein oder registrieren sie sich.

Einloggen mit Benutzername, Passwort und Sitzungslänge
Erweiterte Suche  

Autor Thema: BMW R25/0 - Rethread spark plug thread - Experience  (Gelesen 309 mal)

0 Mitglieder und 1 Gast betrachten dieses Thema.

krhoff

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 19
  • I love BMW-Einzylinder
  • Mitglied seit: 04/02/2016
    Years
BMW R25/0 - Rethread spark plug thread - Experience
« am: 08 Juni 2017, 18:31:05 »

Hi BMW friends,

The spark plug thread on my cylinder head is not in perfect shape. It is not very bad, but there is a small air leak, even when the spark plug is tightened.

I have a thread repair kit, similar to one on the attached picture. What is your opinion about such tools? Could this make a good permanent fix?

Thanks.
Gespeichert

BMW Einzylinder-Forum

BMW R25/0 - Rethread spark plug thread - Experience
« am: 08 Juni 2017, 18:31:05 »

cledrera

  • Oldi-Liebhaber
  • Forums-Urgestein
  • ******
  • Karma: 87
  • Offline
  • Beiträge: 11113
  • Lieber Einzylinder als zwei Fallschirme
    • Köln
  • Mitglied seit: 04/06/2006
    YearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #1 am: 08 Juni 2017, 19:32:10 »

Hi Krhoff,
my car, a BMW 523i, has two of this "Helicoils" an no problems.
Test the west, hope the best.

Only my 50 Cent.

Clemens
Gespeichert
Du bist im Recht; nun sieh zu, wie du da wieder heraus kommst. (v. Chamisso)

rolf

  • Oldi-Liebhaber
  • Forums-Urgestein
  • ******
  • Karma: 174
  • Offline
  • Beiträge: 17972
  • ommmmmh
  • Mitglied seit: 27/06/2002
    YearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #2 am: 08 Juni 2017, 19:34:21 »

These Heli coils are Inserts ;D...some people said they are better than Helis
Gespeichert
und wieder know-how... umsonst....dürfen sich sogar Werkstätten abgreifen

krhoff

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 19
  • I love BMW-Einzylinder
  • Mitglied seit: 04/02/2016
    Years
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #3 am: 08 Juni 2017, 19:52:21 »

Good to hear. I will "Test the west", but hope for no smoke. :)

Thanks a lot.
Gespeichert

bwprice100

  • Hobby-Schrauber
  • **
  • Karma: 3
  • Offline
  • Beiträge: 186
    • SA8 3
    • Swansea
    • Neath Port Talbot
    • Wales
  • Mitglied seit: 30/01/2009
    YearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #4 am: 08 Juni 2017, 21:50:25 »

Hi krhoff

As others have said what you have is not a heli-coil, the look like a Timesert and are better where the thread is disassemble on regular basis.
I only use the spring like Heli-coil when the fastener does not come out often.

I hope this helps

Brian

Sent from my SM-G920F using Tapatalk

rolf

  • Oldi-Liebhaber
  • Forums-Urgestein
  • ******
  • Karma: 174
  • Offline
  • Beiträge: 17972
  • ommmmmh
  • Mitglied seit: 27/06/2002
    YearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #5 am: 08 Juni 2017, 21:57:18 »

You are right...timesert....not insert
Gespeichert
und wieder know-how... umsonst....dürfen sich sogar Werkstätten abgreifen

krhoff

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 19
  • I love BMW-Einzylinder
  • Mitglied seit: 04/02/2016
    Years
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #6 am: 08 Juni 2017, 22:41:36 »

I also have the spring-like heli-coils, but probably not for M14. Yes, I agree on your point, Brian.

My set is not the "Time-Sert" brand. However, the quality seems okay. The tap is missing a part to follow the existing threads, as I have seen on other similar tools. This could make alignment a little bit difficult, but time will tell.

When I have done the re-threading I will make an update. Don't stay up all night - It could take several months before I decide to do the job. Thanks. :)

Gespeichert

krhoff

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 19
  • I love BMW-Einzylinder
  • Mitglied seit: 04/02/2016
    Years
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #7 am: 13 Juni 2017, 21:05:21 »

A small update. I looked at the spark plug threads more thoroughly, and it now seems to me that it has already been rethreaded by the former owner. See the photo below. What do you think? This does not look original to me.

It is possible to tighten the spark plug appropriately using the existing threads. My problem is mainly that I don't have an air tight seal.

Today I tested it with a new BP8HS spark plug, i.e. the projected insulator type, as recommended by Rolf in another thread. This I have tightened according to the standard advice. First hand-tight and then additional 1/2-2/3 turn. There is still a small air leak when I run the engine manually. Maybe I should just accept this?

Thanks.
Gespeichert

bwprice100

  • Hobby-Schrauber
  • **
  • Karma: 3
  • Offline
  • Beiträge: 186
    • SA8 3
    • Swansea
    • Neath Port Talbot
    • Wales
  • Mitglied seit: 30/01/2009
    YearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #8 am: 13 Juni 2017, 21:14:28 »

The leak looks like it is through the insert.

Sent from my SM-G920F using Tapatalk

krhoff

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 19
  • I love BMW-Einzylinder
  • Mitglied seit: 04/02/2016
    Years
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #9 am: 13 Juni 2017, 21:30:25 »

Hi Brian,

Do you mean a leak between the outer part of the insert and the cylinder head? Well, I haven't considered that. That makes sense. Thanks. :)

If this is the case, I guess it would be difficult (at least for me) to make a good repair.
Gespeichert

4Taktix

  • Tips-Editor
  • Oldtimer-Veteran
  • *
  • Karma: 24
  • Offline
  • Beiträge: 2743
  • Hatte fertig
  • Mitglied seit: 09/09/2010
    YearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #10 am: 13 Juni 2017, 23:11:38 »

To verify this, you could screw a wooden dowel or something into the Plughole, put some soapwater 50/50 around it and push the kicker down to see,
if it produces some bubbles and where they start.
If the Dowel woun't seal the plughole, you could cut off the thread of an old sparkplug and weld an appropriate diameter hexbolt into it.
Then apply some sealant to the thread and scew it in, then repeat the test. (maybe candle-wax can serve as a temporary sealant )
Afterwards the hexbolt allows you to remove the DIY-insert with a wrench and you can clean the threads thoroughly from the sealant.
Not the final solution, but at least you know exactly then, where it leaks.
Regards,
Sascha
Gespeichert
Das Gras wächst nicht schneller, wenn man dran zieht!

rolf

  • Oldi-Liebhaber
  • Forums-Urgestein
  • ******
  • Karma: 174
  • Offline
  • Beiträge: 17972
  • ommmmmh
  • Mitglied seit: 27/06/2002
    YearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #11 am: 14 Juni 2017, 00:13:49 »

best repair: welding the alloy (and now for a long thread spark plug)....no problems in future (I have done on all my heads)
Gespeichert
und wieder know-how... umsonst....dürfen sich sogar Werkstätten abgreifen

bwprice100

  • Hobby-Schrauber
  • **
  • Karma: 3
  • Offline
  • Beiträge: 186
    • SA8 3
    • Swansea
    • Neath Port Talbot
    • Wales
  • Mitglied seit: 30/01/2009
    YearsYearsYearsYearsYearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #12 am: 14 Juni 2017, 06:18:40 »

Ues krhoff, that's what I mean.

Brian

Sent from my SM-G920F using Tapatalk

dequincey

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 54
  • broooooummmm
    • BIO
    • baskenland
  • Mitglied seit: 06/10/2013
    YearsYearsYearsYears
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #13 am: 18 Juni 2017, 11:31:42 »

wow that looks awful.
how are the insterts put in place ? are they welded ? compressed by cooling and pressure ? screwed to the alloy ?

why dont you consider bringing the head to a machinist and get a proper repair ?
Gespeichert
if once a man indulges himself in m.

krhoff

  • Schrauber-Lehrling
  • *
  • Karma: 0
  • Offline
  • Beiträge: 19
  • I love BMW-Einzylinder
  • Mitglied seit: 04/02/2016
    Years
Re: BMW R25/0 - Rethread spark plug thread - Experience
« Antwort #14 am: 18 Juni 2017, 23:03:45 »

Dequincey, I don't know how the insert is put in place. However, it seems solid, except for the small air leak. Does it really look that awful?

First, I will see if I can do a simple repair myself. I have thought about applying high-temperature epoxy metal to seal the outer edge of the insert. This is at least a quick thing to try.

If this do not work, yes, I may get it repaired by a machinist. I will probably wait for this until next winter. :)
Gespeichert

BMW Einzylinder-Forum

« am: »

 

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 

anything