9 replies to this topic

[johnR]

I suspect everyone has their own system but I'd like to make my current 1275 build as leak free as possible and I wonder what the best products are. In a Minimania video on diffs the mechanic used a 3m glue of some sort to stick the gasket to one component then silicone when mating to the other component.
Would a smear of blue hylomar both sides suffice? Can I also use this on the rubber gearbox to block seal?

[Spider]

To make these engines & gearboxes leak free (and yes, there is such a thing and can do for long periods) it's seldom down to gaskets and sealants, though they can play a role.

 

95% of the time, it comes down to component fit and it's not often that the gaskets themselves will be a cause of a leak. Along with component fit, the engine breathers need to be appropriate and plumbed correctly.

 

Hylomar is good, but I have only ever used it on solid copper head gaskets. For most other gaskets, I use Loctite (or Permatex) No. 3. If it's a gasketless diff cap I'll use Peramtex Silicon that's compatable with oil. I also use this on the heater take off, thermostat cover and water pump. The No. 3 was OK on these, but I've had better success with the Permatex. I also put a small blob of the Silicon Sealant on the O Ring that's under the diff side cover for the detent. The Oil Pressure Switch, Freeze Plugs and the Nipple in the Oil Filter Head I use Loctite 242.

 

There's a bit more info on the Gasketless Diff Caps here  http://www.theminifo...kets-important/

 

I don't feel that Hylomar is the wises choice for the diff cap.

[TheFabMini]

From the research Ive done that blue hylomar stuff seems very popular and well trusted from everything from aeroplane engines to old bangers.
Ive used it on all the gaskets Ive replaced so far and its nice and tacky and so far Ive had no issues!
The method I was told by a mechanic of 50 years was to put some of the hylomar on your fingers then rub the gasket both sides in it all over so it has a thin but full coverage.
Im no expert but it seems to work!

[johnR]

Yes that was my plan - obviously the last thing you want is gobbets of the stuff floating round in the oil!

[RooBoonix]

I also use Permatex No3. Not a fan of Hylomar, don't know why though, I've never used it!

[jt19]

Wellseal is good stuff. And loctite 242 (is that the grey stuff?)

I use a mix of thoughs on my engines

[Miniman Sam]

Hi, I like to use the - Victor Reinz Reinzosil sealant - , I have had a 100% success rate of curing oil leeks with this and that’s using it on a high temp and stress race mini race engine.
It is also used by modern car manufacturers for new engines that don’t even have gaskets at all.
It may be a bit more expensive than other brands but it does actually work, it is available in a squeeze tube or a power can.

[minimans]

I'm with Moke Spider, It's fit and finish that counts more than the gasket. I use well-seal because it's what we used at Rolls-Royce and besides I love the smell.................................

[whistler]

I'm with Moke Spider, It's fit and finish that counts more than the gasket. I use well-seal because it's what we used at Rolls-Royce and besides I love the smell.................................

Strangely enough I believe that Hylomar Blue was developed for Rolls Royce engines a long long time ago and was only available to buy from Roll Royce Dealers. The most popular alternative back then was Hermatite Red or Green.

[RooBoonix]

I'm with Moke Spider, It's fit and finish that counts more than the gasket. I use well-seal because it's what we used at Rolls-Royce and besides I love the smell.................................

Strangely enough I believe that Hylomar Blue was developed for Rolls Royce engines a long long time ago and was only available to buy from Roll Royce Dealers. The most popular alternative back then was Hermatite Red or Green.

You are correct. Wellseal was also developed for Rolls Royce. I use Wellseal at work (Rolls Royce and Bentley Restoration) and the Hylomar normally gets left in the cupboard! Personal preference at the end of the day