Fitting the Cylinder

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Fitting the Cylinder

Post  parador on Wed 11 Oct 2017, 5:41 pm

Well my cylinder is all bolted onto the boiler today.  I found that I needed to shorten a couple of the studs for the left hand side to get them to fit.  Also needed to remove a little metal on the cylinder around two front studs so that the washer and bolt would lay flat.  

Tightening the studs was a little nerve racking(5 turns of PTFE) as I was unsure of the fine line between tight and thread stripped.  No threads were stripped I am pleased to say - I just hope they are tight enough.  The ball bearing and dome head nut supplied by STW did not really work for me and I found a couple of nuts locked together was easier.

I plan to shorten the studs but I am wondering whether to wait until after the first steaming just incase there is an issue with the studs or the cylinder and the studs/cylinder needs to be removed.

Regards
Martin

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Re: Fitting the Cylinder

Post  Lynn@STW on Wed 11 Oct 2017, 5:57 pm

Hi

I would leave long to start with just in case. The issue of steam passage blow through to exhaust was the older block design. The newer block with the back plate on the cylinders have different internal configuration.

You may also find that the block may settle a bit once steamed.

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Re: Fitting the Cylinder

Post  elwood-59 on Wed 11 Oct 2017, 6:19 pm

Hi,

As I will face same job soon, what would you recommend, Lynn? 5 turns of PTFE tape and the possibility of stripping or cross-threading ( happened to me on other job), the PTFE yarn (like Loctite 55, said to be gas tight, so should also be good for water/steam) or liquid pipe seal (Loctite 567 jumps into my mind => Chrix built on YouTube), expensive but I guess less so than a stripped thread in the boiler Embarassed

Just musing

Elwood

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Re: Fitting the Cylinder

Post  Lynn@STW on Wed 11 Oct 2017, 8:19 pm

Hi

On Crystal I used Heldite jointing compound without issue. Using a liquid thread sealant would be a prefered option for me as little risk to the thread itself.


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Re: Fitting the Cylinder

Post  Capricorn1 on Thu 12 Oct 2017, 12:03 pm

I would advise using Steam Seal or Foliac Paste on the studs.
As for the main joint between the block and the barrel, use Foliac or Steam Seal paste spread reasonably thinly with a brush or spreader - don't be tempted to apply a thick layer as you're aiming for a good tight joint not a thick sandwich, the excess will only find its way into the steam space up to the regulator etc....

If you're going to use Loctite make sure it will withstand over 200 deg C, as the temperature of steam @ 170 psi is just over 190 deg C.

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