Gasket replacement

[Dan 4RR]

Would it be ok to use the silicone type of sealer instead of the normal paper/fibre type of gasket on certain parts of the crankcase? Cheers.
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Humans....the largest form of cancer the world has ever seen!
Speed Cameras - Putting goverment revenue before public safety!

[veeeffarr]

I'd of thought it depends on what part, gaskets are usually cheap?

[Blau Zedong]

What type of engine. On a four stroke possibly not as it tends to end up in oilways.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[stinkwheel]

Just cut out your own gaskets.

If they are not space-critical (eg sump plate, alternator cover), just cut them out of a cornflakes packet.

If they are space critical (eg vertically split crankcase halves) then you HAVE to use a paper gasket of the correct thickness or stuff won't key together properly. In this case either buy one or cut one out of proper gasket paper.

[veeeffarr]

CBR400R NC23 : Generator cover gasket .... £3.95
CBR400R NC23 : Clutch cover gasket .... £7.50

[Trip]

Where'd you get that info from Toby?
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Bike: Yamaha XJ600N Mileage: 28500 Miles Rider Mileage: Many Miles
CBT: PASSED Theory: PASSED Test: PASSED
Past-CG125 Present - Yamaha XJ600N Future - WHO KNOWS?

[veeeffarr]

[Dan 4RR]

[Pete.]

You can make gaskets from gasket paper which is cheap and sold everywhere (and for some odd reason smells like piss). I've made dozens of gaskets to get me out of trouble over the years. First place the gasket paper over the cover/casing and use a tiny hammer to tap around the end of the dowels that most cases have to cut the proper-sized hole in the paper. The paper will then be sitting on the dowel. now press the paper all the way to the sealing face and then draw around with a pencil. Either tap-out the holes with a small ball-pein hammer or use a bolt poked down them and tapped gently to mark position then use a leather-punch/gasket punch to make the holes. Alternatively use a battery-drill and appropriately-sized bit to drill them out through thecasing holes while resting on a wooden surface. Cut the inside profil out with a scalpel and the outside with scissors.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Pete.]

DON't use silicone or any other liquid-gasket material if you can help it. If you must, use only the most thin smear you can get away with. Remember if it squeezes-out on the outside it will have squeezed-out on the inside and that means you potentially have liquid gasket floating around in the sump to clog-up your oil strainer. Seen many an engine ruined by that stuff.

If you must use a sealer, or if you want to seal ahead-gasket or horizontally-split cases, I would reccoment this:

https://www.jlindustrial.co.uk/CGI/INSRCH?ns=1&oldNtt=&oldNtk=&oldURLVar=&scrNtt=PMX-80697H&Ntk=Keyword+Search&x=34&y=13
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[WavyGravy]

[Resurrection]

Dunno about motorbikes but on vans/cars etc i've used plenty of things like boxes/cereal packets to sort stuff.

If your not into that then go dave silver as toby said.

£7 aint gonna break the bank is it?

Res
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ZX9r

[bish777]

blacksilicone rubberand instant gasket is fine for camcovers, timing and generator covers etc etc.
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GSXR1100J

[Walloper]

There is a whole industry out there working on Gasket/Seal/Sealant solutions.
But you don't need any of that tosh.
A Crisp Bag, Cadbury Dairy Milk Wrapper or lick'n' stick The Back Page of the Daily Star on and it should be OK.


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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[stinkwheel]

[Walloper]

Stole:

A gasket is a mechanical seal that fills the space between two objects, generally to prevent leakage between the two objects while under compression. Gaskets save money by allowing less precise mating surfaces on machine parts which can use a gasket to fill irregularities. Gaskets are commonly produced by cutting from sheet materials, such as gasket paper, rubber, silicone, metal, felt, fiberglass, or a plastic polymer. Gaskets for specific applications may contain asbestos. It is usually desirable that the gasket be made from a material that is to some degree compressible such that it tightly fills the space it is designed for, including any slight irregularities.

One of the more desirable properties of an effective gasket in industrial applications for compressed fiber gasket material is the ability to withstand high compressive loads. Most industrial gasket applications involve bolts exerting compression well into the 14 MPa (2000 psi) range or higher. Generally speaking, there are several truisms that allow for best gasket performance. One of the more tried and tested is: "The more compressive load exerted on the gasket, the longer it will last". There are several ways to measure a gasket material's ability to withstand compressive loading. The "hot compression test" is probably the most accepted of these. Most manufacturers of gasket materials will provide or publish these results.
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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[Dan 4RR]

Thanks for the replies. Should have mentioned this earlier, but the reason I asked is because my dad works down the pit and they use massive gear boxes (normally the size of 1-2 minis) to pull mile long conveyor belts and they take some serious hammer and need to be serviced quite regularly and according to my dad they use the silicone to seal the cases together and I just wondered if this was possible with bikes

Upon closer inspection today, I noted that certain parts of my CBR crankcase does have this rubber type of material instead of a normall paper casket
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Humans....the largest form of cancer the world has ever seen!
Speed Cameras - Putting goverment revenue before public safety!

[bish777]

If you use the silicone stuff, use it sparingly.

Too much of it and the stuff can fall into oil lines etc etc.
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GSXR1100J