[modeleng] Re: Injector problems

Hello Peter,
Injectors are queer things they act strangely at times,eg I used to buy my 
injectors direct from the bloke who made them & never had any trouble, but 
he retired so I bought them anywhere. Non of them would work properly & they 
all dribbled, someone on the other list found if you put a 30 thou shim 
behind the steam inlet they would work, this is true but they still 
dribbled. When driving No.7 the other day  the injector suddenly started 
working properly & continued to do so, why?

E.W.
----- Original Message ----- 
From: "Peter Sheppard" <peter@xxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, August 26, 2008 1:33 PM
Subject: [modeleng] Injector problems


>
> Here's a new one for you!  Explain this!
>
> We had a very busy weekend at the Lackham Museum and Woodland Railway with
> single Fairlie Tinkerbell (#4) peforming sterling service.  There was
> however one minor problem on day 1 in that the injector clack would leak
> back through the injector.  This meant that it was difficult to get the
> injector to pick when required.  At the start of day 2 I cleaned the clack
> through and ensured there was no debris and that the ball was clean.
> However that had no effect on the leak!
>
> My son however found a solution, if you cool the clack (note clack, not
> injector!) then the ball will seat and the leakage stops!
>
> Is it possible that the cooling of the clack body somehow corrects a
> distortion and the ball seats properly?  Would it be any better if I
> replace the steel ball with a nitrile one to allow for what might be a
> slight distortion in the clack body/ball seat?
>
> Cheers
>
> Peter
>
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