Porous LT77 gearbox casting

[blitzracing]

I have an LT77 box from the early 90's that constantly seeps oil (always has done from new). Its been suggested there where problems with porous castings at this time, and it may be possible to spray or paint a air dry epoxy(?) paint to seal it from the outside. Happy to drain the oil and clean the casting first obviously. Any product suggestions or other ideas?

[eliot]

Hardly a rare box, why not replace it?

[Steve_D]

eliot said:

Hardly a rare box, why not replace it?

Says the man who probably has 2 or 3 under his workbench.

Steve

[garagewidow]

one of the commonly available two part resin 'metal' substitutes would probably be better like chemical metal or rectorseal,may have to grind out a small amount of the original metal to enable enough to be applied as the thicker the section the better.should almost be as strong as the metal itself too.

[AlfaSpider]

vacuum casting impregnation is the process used for sealing porous blocks/heads I believe. I don't see why you couldn't use it on any casting.

[DVandrews]

Ultraseal in Slough can sort it, but it will need to be stripped. I have seen porous sumps cured using very low viscosity loctite smeared on the surface with the application of a little heat. Thorough cleaning with carb cleaner is a must (after draining).

Dave

[blitzracing]

eliot said:

Hardly a rare box, why not replace it?

I have reinforcing bars on my chassis that go around the gearbox, so to remove it apart from taking the engine out, I have to remove half the interior / dash to get the bars out. Its a lot of work for the odd oil top up once a year....

[eliot]

blitzracing said:

eliot said:

Hardly a rare box, why not replace it?

I have reinforcing bars on my chassis that go around the gearbox, so to remove it apart from taking the engine out, I have to remove half the interior / dash to get the bars out. Its a lot of work for the odd oil top up once a year....

I would of thought you will have a devils own job getting any product to stick to a porous oily surface if you aren't taking it apart to clean it.

[gog]

You could try Oyltite stick from www.frost.co.uk

[blitzracing]

eliot said:

I would of thought you will have a devils own job getting any product to stick to a porous oily surface if you aren't taking it apart to clean it.

I was hoping if I drained the oil, then sprayed neat thinners on at pressure to flush any oil away, I could end up with enough clean surface to get something to sick. I have done it quite succesfully with a stripped sump bolt thread, so I could then use JB weld to hold the sump plug in again after I drilled and tapped a new drain bolt into sump plug. Ive tried Oyltite stick, it works a treat on joints, but not something you could really rub into the casting dues to its shape.