Model Boat Mayhem
The Shipyard ( Dry Dock ): Builds & Questions => Steam => Topic started by: pipercub1772 on October 19, 2009, 01:27:44 pm
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hi just got a old cheddar puffin engine and boiler`wants a good referb i notice it has a no 10 gas jet for the burner is that the correct size ,also i would like to update the safety valve what size is the thread size in the boiler bush any advice appreciated , thanks allan .
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what safety valve has it got have you a picture ? as the cheddar ones are very good and I have never heard a complaint, ill check the jet for you as it does not ring a bell that size.
Peter
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hi peter its a cheddar valve it started blowing about 20 psi is it just a case of adjusting the 2 nuts on the spring and maybe it needs the o/rings renewing had the blow of pipe on when i ran it so not sure at the moment, thanks allan
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Hi Pipercub,
I have had my Puffin Version 2 Vertical Boiler for about 11 years (since new) and it was fitted with No. 8 gas jet. I have just re-checked in the instructions and can confirm that (for mine) it is correct. I bought a spare "just in case" and recently, because I suspected I had a blocked jet, swapped it. The jet wasn't blocked, as it happened, what I did learn were two important things.
Firstly, read the instructions (the last time I fitted the jet was 10 years ago and, from memory, it was a simple job) and secondly, the instruction to thread seal the jet is important - it did not burn properly until I did! After changing the jet I did not get the satisfying "pop" when the flame went down the chimney to the burner, instead it burned nicely in the chimney - which very quickly got hot!!! It took me a frustrating hour to find that problem and less than a minute and two drops of thread-sealer to fix it. :embarrassed:
I have the 90 PSI safety valve on my boiler but I have noticed that the top internal nut sometimes works loose and it vents off too early. I suppose I could put some threadlock on this too but, as it fails safe (i.e. blows off at a lower pressure), I can live with inconvenience of having to re-set it. Although I have mine set at 60PSI believe this is on the low side for this particular boiler. Somewhere on this site I remember interetingly reading all about the sizes of the threads used on a Cheddar boiler. If I can find it I will let you know where it is.
One day I may actually get round to fitting it (and the Gemini Engine) in a boat :}
Hope this has been of some help.
Dave
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hi dave ,thanks for the reply ,ive just ordered a no 8 gas jet from cleveden steam and he confirmed what you said about the size incidentally he has a number of spare parts for cheddar engines /boilers which may be of interest to you, i will certainly take note of the thread sealer upon fitting,never would have thought of that one