Block/crankcase gasket

[Steve kay]

A summer of trying to deal with oil leakage has finally indicated that it realy is the less than happy relationship between block and crankcase that needs to be resolved. So splitting them to insert a gasket must be done sooner rather than later. So this is to ask for recommendation as to which supplier provides the best silicone gasket, unless there is another option that the wise heads of the forum might suggest.

[Paul N-M]

Hi Steve,
Three Bond 1184 on its own. No paper or any thing else.
Makes for a very stable and leakproof joint.
We use it for all Seven engines we build, especially suitable for hi comp/high revving ones. (IMHO)

Paul N-M

[Derek Sheldon]

I’ve used silicon gaskets on two of my engines with great success, Seven Workshop supplied. 
Just as an aside , I have just rebuilt another and cut gaskets for the other joints from a silicon baking tray.

[Michael D]

Thank you for. opening this topic as I am on a similar limbo
The engine of my Rosengart is scheduled for major surgery with a reconditioned cilinderblock by Tony Betts, Slipper pistons, Ricardo head by David Dye, Phoenix crank and con rods (if and when supplied...Gerry indicated January 2020) etcetera.
Opinions seem to differ on silicone gaskets as some say they are prone to 'creeping' and advice against using them on anything else than standard - spec engines.

Three Bond 1184 gets good reviews in general and some do use it in combination with a paper gasket (applying it to both sides) even though the Three Bond spec sheet itself prescribes applying it thinly to both surfaces to be joined and laminating after about one minute 'drying'. Over here in the Netherlands I could only find one supplier of Three Bond 1184 but they only sell it in 1 kilo tins; not in tubes. On Amazon there is only a supplier located in the USA but obviously Demon Tweeks supplies Three Bond 1184 as well (and in the past I've been quite happy with buying from DT) so as sated: I'm very interested to learn from you people and please also do write about Three Bond 1184 in this respect.

[Geoff101]

I'm watching this with interest as I have to make the same decision on mine soon. I was currently just planning to use the standard gasket. Doesn't a silicone gasket just get squeezed out of the sides when you tighten the block down?

[Jeff Taylor]

Michael,

Three Bond 1184 is available in tubes from the following companies in the UK:

https://www.techsil.co.uk/threebond-1184-200gm

https://www.speedsportshop.co.uk/product...id-gasket/

https://www.ebay.co.uk/itm/THREEBOND-118...2358834803

http://bdkraceeng.co.uk/tc/products.php?419

[Ruairidh Dunford]

I used Threebond years ago, moved to Tigerseal and then started using the silicone base gaskets from Jamie.

50 engines or so later, without issue or leaks, I won’t be going back - unless he stops making them. All three products work equally well for me but the ease of fitment and low cost was the clincher for the silicone gasket.

Fit them completely dry, trim the (small) excess off, let sit for 24 hours, retighten and then adjust tappets.

[Terrytuned]

I use ThreeBond 1215 silicone from the SpeedSportShop it has a longer assy time than the 1184 as you have to be quick with the 1184 as starts to skin in around 5min.
It has the same consistency as 1184 and available in gray or black and makes assy much easier. Terry.

[Colin Wilks]

Using glue rather than gasket material seems sensible as it spreads the loads trying to separate the block from crankcase beyond the studs.

The blurb on the Three Bond site http://www.threebond.com.my/product/thre...ne-gasket/ doesn't mention subsequent disassembly. Would value the experts comments on this aspect.

[Charles P]

Using glue rather than gasket material seems sensible as it spreads the loads trying to separate the block from crankcase beyond the studs.

The blurb on the Three Bond site http://www.threebond.com.my/product/thre...ne-gasket/ doesn't mention subsequent disassembly. Would value the experts comments on this aspect.

Threebond 1215 grips well but it is reasonably simple to break apart. Easier than Loctite 515.
It's a very good gasket sealant/replacement

Charles