13 replies to this topic

[JonnyAlpha]

Hi,

 

I need some sealant for the half moon seal on the crank and was told to use RTV Grey Sealant. I also asked what gasket paste people use these days and was told again to use RTV grey. 

The only stuff I can find is this on eBay is that the stuff?

 

 

[floormanager]

No expert but I've used this before

https://www.ebay.co....fEAAOSwRhVbjnFB

[mk1leg]

use Hylomar Blue as it never hardens for all gaskets accept the head gasket on the half moon a silicone based is best

[JonnyAlpha]

No expert but I've used this before

https://www.ebay.co....fEAAOSwRhVbjnFB

 

For the half moon seal?

 

use Hylomar Blue as it never hardens for all gaskets accept the head gasket on the half moon a silicone based is best

 

Yes I have always used Hylomar Blue but lots of videos I have been looking at lately seem to be using a grey paste. Somerford Mini also recommended RTV.

[Curley]

I prefer to use Permatex Aviation No3 over any of the tacky/silicone sealers for the half moon

Edited by Curley, 14 October 2019 - 08:24 PM.

[floormanager]

I use blue Hylomar on all paper seals and the loctite 5922 underneath, on it and on the ends of the half-moon seal, where they meet the paper gaskets.

 

Loctite 5922 Flange Sealant Product description

The Loctite 5922 Flange Sealant a slow drying, flexible setting paste that changes to a pliable, non-hardening film through solvent evaporation. It seals flanges, fittings, connections and flexible assemblies against leakage and increases the reliability of gasket seals.

It is suitable for valve cover gaskets, oil pan gaskets, threaded connections, cover plates and hose connections.

features & benefits of Loctite 5922 Flange Sealant

• Improves reliability
• Extends gasket life
• Stops leakage
• Excellent for all metal to metal assemblies
• Slow drying
• Flexible setting
• Withstands temperatures of -55 to +200C
• Suitable for: valve cover gaskets, oil pan gaskets, threaded connections, cover plates & hose connections

Edited by floormanager, 14 October 2019 - 08:06 PM.

[imack]

I never use any sealant on the 1/2 moon seal other than where the block/gearbox gasket lays on top of it. I use vauxhall grey sealant on all gaskets. I don't cut the 1/2 moon seal down either.

[Cooperman]

I have used black RTV on the 1/2-moon seal. It must never be shortened as the seal comes from the compression of the material, not from any sealant. The reason I use a small amount of RTV is to hold it in place whilst the engine is lowered onto the gearbox.

[JonnyAlpha]

I have used black RTV on the 1/2-moon seal. It must never be shortened as the seal comes from the compression of the material, not from any sealant. The reason I use a small amount of RTV is to hold it in place whilst the engine is lowered onto the gearbox.

 

This stuff?

[Cooperman]

 

I have used black RTV on the 1/2-moon seal. It must never be shortened as the seal comes from the compression of the material, not from any sealant. The reason I use a small amount of RTV is to hold it in place whilst the engine is lowered onto the gearbox.

 

This stuff?

 

That's the stuff.

Use very sparingly.

[johnv]

Do you have to trim the ends of the paper gasket though, otherwise they will interfere with the seal?

[Cooperman]

No,just lay the ends of the paper gasket on the top of the half-moon seal with some RTV locally then lower the engine carefully onto the box. Check using a light that the seal has not moved as the engine was lowered.

[floormanager]

People say easier to lower the g/box to the engine.  That's the way I've done it.

Paul

[mk1leg]

 

No expert but I've used this before

https://www.ebay.co....fEAAOSwRhVbjnFB

 

For the half moon seal?

 

use Hylomar Blue as it never hardens for all gaskets accept the head gasket on the half moon a silicone based is best

 

Yes I have always used Hylomar Blue but lots of videos I have been looking at lately seem to be using a grey paste. Somerford Mini also recommended RTV.

 

what ever you prefer