15 replies to this topic

[HUBBA.HUBBA]

As above. For an engine rebuild, so for timing plate, cover. Gear box to block etc

[ANON]

if you can get hold of it pro-seal aviation gasket sealant, fine with oil and fuel and it never dries so makes taking things apart easy peasy.

or just oil on paper gaskets if you want.

[Yoda]

Oil soaked paper works for me too. If it don't then your mating surfaces need attention. Wurth's own brand rtv sealant is pretty good too.

[mattbeddow]

Ive got a tube of loctite sealant from halfords that works pretty well, its non setting and is good for oil fuel and water. £5.50 a tube though

[Cooperman]

Hylomar is the stuff. Originally developed for the R-R Merlin aero-engine (more useless information!).

[antcole]

Any good quality RTV sealant, preferrably a good brand like loctite's 5910, Wurth or even the Dirko grey sealant would be fine.
Hylomar is ok but im a real believer in RTV silicone sealants applied to oil free gasket material.

The trick with silicone based sealants is the amount you apply..... a bead or a thick layer on any gasket will ooze out loads at the edges, look untidy and also likely to form little worms of the stuff which blocks waterways and oil sump strainers.... plus if you apply too much sealant on a gasket, its likely to skid out of shape and even split the gasket material, ruining your hard work.

It should be applied so lightly that youre simply wetting the surface of the gasket with the thinnest possible coat. That way you get none oozing out and the imperfections of the joint surfaces will be filled.
Some sealants are better when allowed to cure for a few minutes before assembly, allowing the silicone to become more rubbery.
Even and equal tighening of the bolts helps a lot too.

Ive been cursed for my love of RTV sealants in the past by 'old school' fitters and engineers.... but ive never had a joint leak yet.

[HUBBA.HUBBA]

I'll just use the blue hylomar i've got knocking about then. Cheers

[HUBBA.HUBBA]

Whatwould be the best sealant for this seal - http://www.minispare...|Back to search

[tiger99]

A tiny little bit of RTV on each end where the sump gaskets overlap it is essential, but the main part does not need anything as it is a rubbery compound. However, you can safely run a thin bead of RTV around the outside, in the groove.

[HUBBA.HUBBA]

A tiny little bit of RTV on each end where the sump gaskets overlap it is essential, but the main part does not need anything as it is a rubbery compound. However, you can safely run a thin bead of RTV around the outside, in the groove.

ok cheers

[carbon]

+1 for Hylomar Blue

[jaydee]

On timing cover, smear little sealant only on the bottom half of the gasket. RTV or hylomar blue both of them are good.

[Cooperman]

A tiny little bit of RTV on each end where the sump gaskets overlap it is essential, but the main part does not need anything as it is a rubbery compound. However, you can safely run a thin bead of RTV around the outside, in the groove.

Exactly what I do as well. It surely works OK.

[HUBBA.HUBBA]

A tiny little bit of RTV on each end where the sump gaskets overlap it is essential, but the main part does not need anything as it is a rubbery compound. However, you can safely run a thin bead of RTV around the outside, in the groove.

Exactly what I do as well. It surely works OK.

Out of interest, does anyone ever trim the ends of the half moon seal? I've had to set the seal down with rtv sealant as i had fun and games lowering the block down by hand and getting it lined up ok on the seal without it slipping around. Now i have now set the seal on the gear box housing, i don't think it'll compress evenly.

[tiger99]

No, you must not trim the half moon seal. It is made the size it is for good reasons. I have never had trouble fitting one, even the hard way with the gearbox still in the car.