Help - Cylinder Block Front Covers / Rear Piston cover sealant query
+6
lynnr
Steve Traill
Vapor
mikero
Old Down Trevor
FodenSWB
10 posters
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Help - Cylinder Block Front Covers / Rear Piston cover sealant query
Hi,
We are in the process of fitting the cylinder block front covers an associated rear machined parts but the instructions do not appear to reference applying sealant to these items are they fitted as is or should I be applying foliac paste or something else to them prior to final fitting and then tightening of the nuts on the studs.
Cheers
Nick & Ken
We are in the process of fitting the cylinder block front covers an associated rear machined parts but the instructions do not appear to reference applying sealant to these items are they fitted as is or should I be applying foliac paste or something else to them prior to final fitting and then tightening of the nuts on the studs.
Cheers
Nick & Ken
FodenSWB- Number of posts : 27
Location : Tewkesbury
Registration date : 2012-08-31
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
I would use the gaskets supplied plus a smear of foliac. Have you checked to ensure that the central hole in the front covers is concentric with the outer diameter that locates in the cylinder bore- mine were not concentric consequently when assembled everything locked up solid - I could nut move the piston. Thankfully problem is being resolved with the help of Steve
regards
Old Down Trevor
regards
Old Down Trevor
Old Down Trevor- Number of posts : 13
Location : Bristol
Registration date : 2014-01-09
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
Cheers, we had thought that it might be the case that we needed to use foliac as well as the gasket in a similar manner to the cylinder block. We have had the pistons and guides fitted but at that point without the piston rings so will check the fit again once they are fitted to make sure we don't have any issue with movement of the piston.
Cheers
Nick & Ken
Cheers
Nick & Ken
FodenSWB- Number of posts : 27
Location : Tewkesbury
Registration date : 2012-08-31
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
If you are going to put any kind of sealant on the gaskets its a good idea to drill and tap each cover for a release bolt.
Mike
Mike
mikero- Number of posts : 261
Location : Brighton
Registration date : 2011-07-19
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
Well for what's it's worth I fitted the gaskets as supplied they sealed perfectly just as it said on the tin, never had a wisp of any steam losses.
Vapor- Number of posts : 383
Age : 113
Location : Isle of Wight (2" Burrell & 5" Duchess ex MW)
Registration date : 2008-06-18
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
Thanks for that may just fit them dry then to see what happens.
Cheers
Nick
Cheers
Nick
FodenSWB- Number of posts : 27
Location : Tewkesbury
Registration date : 2012-08-31
Gaskets
On the DCC & my aggi I use gaskets for all mated surfaces and also use Hylomar gasket sealant on one side and grease on the other. It's much cleaner than foliac, disassembles without damaging the gasket and always seals perfectly.
Steve Traill- Number of posts : 800
Age : 67
Location : Illogan Redruth Cornwall
Registration date : 2008-06-29
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
I am a total skin Flint.
All my gaskets are made from Cornflake packet with oil on both sides when assembling. Seals very well and allows easy non damage removal and refit of covers.
All my gaskets are made from Cornflake packet with oil on both sides when assembling. Seals very well and allows easy non damage removal and refit of covers.
lynnr- Number of posts : 3242
Age : 55
Location : Highland, 4inch showman
Registration date : 2010-08-06
Gaskets
What a good idea, I'll try that next time.
Steve Traill- Number of posts : 800
Age : 67
Location : Illogan Redruth Cornwall
Registration date : 2008-06-29
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
The cornflakes will be beneficial as well.
Mikero
Mikero
mikero- Number of posts : 261
Location : Brighton
Registration date : 2011-07-19
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
Well well, I wouldn't have thought cornflake cardboard would be up to the job!... Obviously it is, so I'm now awaiting my daughter to finish up the Crunchy Honey Nut Cornflakes, so I can get going on all the gaskets for both my engines!!
I'm assuming "Crunchy nut card board" is same (or better than) ordinary corn flakes here, also does it have to be Kellogs cardboard?
Good one Lynn!
Regards,
Tony
I'm assuming "Crunchy nut card board" is same (or better than) ordinary corn flakes here, also does it have to be Kellogs cardboard?
Good one Lynn!
Regards,
Tony
Tony King- Number of posts : 856
Age : 68
Location : scotland
Registration date : 2008-10-31
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
I can confirm the Crunchy nut cornflake cardboard works. I coated both sides with foliac, not thought about oil. Not tried to take it apart as yet so may need to remake .
Ian
Ian
IanL- Number of posts : 437
Age : 68
Location : Nottinghamshire
Registration date : 2011-07-25
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
EXCELLENT, that's a definite then, I'll get my daughter on the crunchy nut corn flake diet!!
Regards,
Tony
Regards,
Tony
Tony King- Number of posts : 856
Age : 68
Location : scotland
Registration date : 2008-10-31
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
Kellogg is better cardboard.
lynnr- Number of posts : 3242
Age : 55
Location : Highland, 4inch showman
Registration date : 2010-08-06
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
It is Kellogg!!!! Or it's they are?
Such high quality engineering on this forum of recent .
Ian
Such high quality engineering on this forum of recent .
Ian
IanL- Number of posts : 437
Age : 68
Location : Nottinghamshire
Registration date : 2011-07-25
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
I am resurrecting this thread to get some views on using high temperature silicon rubber sheet as a gasket material for front and rear cylinder covers. I have bought a sheet of 1.5mm thick sheet and I plan to make a gasket out of it. The Foliac is so messy and I don’t see how it could be as good as a gasket of uniform thickness and known dimensions.... any views ?
milford59- Number of posts : 307
Location : Milford on Sea
Registration date : 2019-05-19
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
1.5mm seems a bit thick in my mind, well unless you have big issues with the mating surfaces ?
LiveSteam- Number of posts : 777
Location : Hampshire
Registration date : 2013-09-08
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
LiveSteam wrote:1.5mm seems a bit thick in my mind, well unless you have big issues with the mating surfaces ?
The mating surfaces are good - that Foliac is such filthy stuff.
1.5mm will compress down to 1mm... and that can’t be a lot thicker than the cornflake packet mentioned on this thread
High temp. Silicon rubber is made for use in high pressure applications where steam is present - it seems perfect for sealing - but what do I know about traction engines !!
Now that I have spent a fiver on the sheet , I think I will make a gasket and trial fit it and see....
EDITED: I have slept on this idea and am now having second thoughts, as the face of the rear cover will be a tiny bit further back than with Foliac or thin card and it might interfere with the fitting of the slide bars... I will see...
milford59- Number of posts : 307
Location : Milford on Sea
Registration date : 2019-05-19
milford59- Number of posts : 307
Location : Milford on Sea
Registration date : 2019-05-19
LiveSteam likes this post
Re: Help - Cylinder Block Front Covers / Rear Piston cover sealant query
OK - just to finish off what I started, I have now made the gasket from 1mm thick silicon rubber sheet and test fitted it to the rear surface of my cylinder and I reckon it will do the job nicely…….I am no expert on steam engines, but the specification of the material strongly suggests to me that it will do a good job, and avoids the filthy mess that you get from Foliac.
milford59- Number of posts : 307
Location : Milford on Sea
Registration date : 2019-05-19
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