10 replies to this topic

[Ado1379]

Hi all, I have done a search and there seems to be very type of sealant under the sun named and shamed.

I’m almost at the process of rebuilding the engine and I’m just wondering if Hylamar blue is ok to use? We use it at work for rotary engines but these don’t use paper gaskets, so I can get it pretty easily enough.

Is this also good enough for the half moon seal? And if there are any tips you could offer before I start rebuilding they would be welcome. The block and box were split to deck the block, but whilst I’m at it I’ve replaced the piston rings as they were suspect anyway and the bores will be honed. I have all the gaskets for both block and gearbox so I want to get them replaced whilst it out the car. I’m also fitting a central oil pick up and new oil pump.

Thanks guys

[imack]

I use this stuff from Vauxhall, basically because I use it at work, don't get any leaks with it. I don't use any sealant on the 1/2 moon seal other than a bit where the paper gasket overlaps it. Don't shorten the 1/2 moon seal.

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[Spider]

I use Permatex / Loctite No.3 gasket goo on all gaskets that are in contact with Oil.

If you have a late (post 83-ish) gearbox, the cap needs special attention;-

 

http://www.theminifo...kets-important/

The 'plain' 1/2 moon seals, I put a lick of the No.3 sealant on to. The ribbed type are longer, I, put a smear of RTX on these, not to make them seal, but to give some lubricity on them as they pick up easy on the gearbox case and rather than 'settle' it will tend to drag with the case and end up under the sump rails. The RTV lets it all slide together nice while proving a seal. Rover recommended using RTV on the ends of the seal and oiling the rest of it.

[blacktulip]

I used hylomar blue on my last engine build and ever since. Its great stuff

[sovenmini]

Last time I built and engine I used hylomar blue and I can’t fault it, but I would be careful not to put to much on as I have stripped engines down and found bits that have deposited in the engine and can see them blocking oil ports, I have some friends that build high spec motorbike engines and hylomar blue is like the devils work there and hate it, put they use a product called three bond (also know as ducati bond) and can honestly say it’s the best stuff I have used so far and that now is always my first choice, but this is my personal opinion.

Edited by sovenmini, 30 April 2020 - 10:34 PM.

[Steve220]

I use 3M ultrapro high temp gasket sealer. Just a light smeer on the gasket or mounting face and leave to dry. I also use it on exhaust flanges.

[Ado1379]

Thanks guys! I think I’ll stick with Hylamar as it’s readily available. Being my first engine out job, I’m really enjoying getting this stuck in to the engine, I can see why mechanics are always so happy ? haha!

[ quote name="Moke Spider" post="3645940" timestamp="1588276938"]

I use Permatex / Loctite No.3 gasket goo on all gaskets that are in contact with Oil.

If you have a late (post 83-ish) gearbox, the cap needs special attention;-

http://www.theminifo...kets-important/
The 'plain' 1/2 moon seals, I put a lick of the No.3 sealant on to. The ribbed type are longer, I, put a smear of RTX on these, not to make them seal, but to give some lubricity on them as they pick up easy on the gearbox case and rather than 'settle' it will tend to drag with the case and end up under the sump rails. The RTV lets it all slide together nice while proving a seal. Rover recommended using RTV on the ends of the seal and oiling the rest of it.[/quote]

I have a DAM 5626 box, and it had a gasket when I stripped it. I have been driving this car for about 2 years and haven’t had any problems with the gearbox so I reckon I’ll be ok to put a new gasket on?

[whistler]

Us old folk started using Hylomar Blue in the 60's and it was great stuff. Before that it was Hematite Red. The Hylomar was better because you could remove the old gasket in one piece which saved all that scraping. Unfortunately I think they changed the formulation over the years and most times you have to scrape the gaskets off. Still a good sealant. I also use a little Permatex on half moon seal.

[steeley]

Us old folk started using Hylomar Blue in the 60's and it was great stuff. Before that it was Hematite Red. The Hylomar was better because you could remove the old gasket in one piece which saved all that scraping. Unfortunately I think they changed the formulation over the years and most times you have to scrape the gaskets off. Still a good sealant. I also use a little Permatex on half moon seal.

Most of my old gaskets, even on the diff caps are stained red and really hard to get off would that be the above, I think they are all original to the car

[whistler]

 

Us old folk started using Hylomar Blue in the 60's and it was great stuff. Before that it was Hematite Red. The Hylomar was better because you could remove the old gasket in one piece which saved all that scraping. Unfortunately I think they changed the formulation over the years and most times you have to scrape the gaskets off. Still a good sealant. I also use a little Permatex on half moon seal.

Most of my old gaskets, even on the diff caps are stained red and really hard to get off would that be the above, I think they are all original to the car

 

Probably Hermatite Red. A real pig to remove, that's why Hylomar was so popular back, if you could buy it. It was usually only available from Rolls Royce Dealers' parts department.

[sonscar]

I miss the smell of Stag?a stinky brown liquid.Steve..