Jump to content

Mikuni MX40


Theo

Featured Posts

I have a this here heater which has done valiant service for the past 15 years.  I have occasionally cleaned the glow plug and once or twice cleaned the flame detector but now I have a problem.

 

The two cross head machine screws that hold the glow plug boss in position have stripped the threads of the alloy casting into which they screw.  Ditto a couple of the hex machine screws that hold the fresh air fan assembly to the alloy body.  Is there a sensible way of sorting out this problem?

 

Nick

Edited by Theo
Rubbish typing and not reading through before posting
Link to comment
Share on other sites

Thanks, Mr D'arth.

 

Drilling and rethreading would seem the most satisfactory way.  I had heard (read?) that you can insert a thing like a spring into the hole to produce a new thread but I suspenct that this would mean drilling out a larder hole and rethreading with a tap would be much more satisfactory.

 

N

Link to comment
Share on other sites

48 minutes ago, Theo said:

Thanks, Mr D'arth.

 

Drilling and rethreading would seem the most satisfactory way.  I had heard (read?) that you can insert a thing like a spring into the hole to produce a new thread but I suspenct that this would mean drilling out a larder hole and rethreading with a tap would be much more satisfactory.

 

N

Helicoil. But not sure if you can get them that small.

Link to comment
Share on other sites

You could use helicoils or 'Cross thread inserts' but these are not good if you need to dismantle as they have a tendency to wind out on the threaded screw.

A much better product to use in aluminium is called a 'Keensert. Look at Claredon fastener or WDS web site for details or pm me for help. I have used these a lot.

They are screwed in and locked with small pegs but you do require enough  material around the hole to do this, also the correct taps and drills. 

Ideally the heater needs to be removed so holes can be drilled and tapped in a machine. May be able to help you with this.

PS I have the same heater.

Alternatively look on eBay for old defunct heaters and build a good one up.

 

Link to comment
Share on other sites

Confession time:

 

Te threads have been stripped for some time.  What I did for the last couple of services was to insert some bits of fine copper strands stripped out of scraps of wire that I had.  They worked fine but I thought that there might be something a bit more refined.

 

Thanks for all the suggestions.  The problem with buying old jobbies to canibalise is that they might have just the same threads stripped!.

 

N

  • Greenie 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.