[TR] Fo8 Sealants Question and List Responses

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RESULTS OF Fo8 SEALANT THREAD—Thanks again to all who contributed

We had around 25 responses of one sort or another, several good suggestions and a couple of “heads up”  regarding “aggressive” motor oil potential reaction with some sealants.
Most popular with 7 users was HYLOMAR BLUE
Next was PERMATEX AVIATION with 5 users
Then came YAMABOND #5 with 3 users
Followed by unspecified SILICONE with 2 users
COPPER COAT,  PERMATEX BROWN and INDIAN HEAD SHELLAC each had 1 user
Several responders suggested that perhaps if the mating surfaces (see below) were in good shape then no sealant al all might be the way to go...
One responder (with a couple of like minded individuals)suggested using an old liner cleaned up and true as a sort of hone to polish the “land” in the block.  This might also work to emphasize highs and lows in the land if a bit of Prussian blue was applied to the land prior to using the “hone”.





On Feb 8, 2021, at 11:43 AM, John Macartney <john.macartney at ukpips.org.uk> wrote:

Interesting that the factory workshop manuals do not specify a particular product or brand….

Basic Reasons:

1. Unless absolutely essential, the company policy was not to recommend any one product over another except for things such as oils and fuel octane ratings which latter are calculated still in two different ways.
2. Some products are known in only a few markets and not all of them. Company was supplying product to over 100 different markets.
3. The cars were only designed to last for a maximum period of 10 years, so why bother as mostly the cars would be maintained by the dealers for all but the simplest tasks.

Yes, I remember each car handbook described how to set valve clearances and ignition timing whereas today, the handbook in my wife’s new car points out the dangers of drinking battery acid.

I do recall some manuals and service bulletins called for a sealant called DumDum - and of course, few people if any outside the U.K. have ever heard of DumDum. Even this list has speculated on it!

Jonmac
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