The Triumph Dolomite Club - Discussion Forum

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PostPosted: Sun Jul 08, 2018 5:02 pm 
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Having had issues getting the water passages to seal when refitting the inlet manifold on Binny (1850 Dolomite) I thought it would be interesting to compare the new blue grey ones against red-ish NOS style ones.

The difference in thickness is really quite large...

Red-ish NOS ones - 0.0215" (about 22 thou on average)
Blue gray ones - 0.065"

About 3 times thicker!

Image

Image

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PostPosted: Sun Jul 08, 2018 6:05 pm 
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It's some years since I bought some.
The first were purchased from Rimmer Bros, they were made of very thin paper - I didn't fit them, they just didn't look right.
I then bought from TD Fitchett, the gaskets were much thicker. Used them, no issues.


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PostPosted: Sun Jul 08, 2018 8:09 pm 
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I recently fitted a Rimmers blue manifold gasket to Rich's Sprint. Both head and (Weber) manifold were spotlessly clean and appeared, to all intents and purposes, flat. It leaked like a sieve, as soon as the coolant level reached the joint, without even starting the engine. I had to remove the manifold again and ladle a load of silicone round the water gallery before it would seal and hold running pressure! I wasn't impressed! But i'm at a bit of a loss as to WHY? Is the paper they are using somehow uneven in thickness? Or porous? It doesn't make sense!

Steve

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PostPosted: Sun Jul 08, 2018 8:20 pm 
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Quote:
It leaked like a sieve, as soon as the coolant level reached the joint, without even starting the engine. I had to remove the manifold again and ladle a load of silicone round the water gallery before it would seal and hold running pressure!
Exactly the issue I had the first time I tried to refit the manifold on Binny.
I might make enquiries with some gasket companies about getting a batch closer to the original thickness made up.

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PostPosted: Sun Jul 08, 2018 9:33 pm 
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Both 1850 and Sprint inlets have in my opinion a missing bolt; ideally they both need another in the bottom right corner to effect a good seal to the water jacket. My thinking is a thicker gasket is able to be compressed by the bolts and should therefore be a better option...EXCEPT in the bottom right hand corner where the missing bolt cannot do its job. A thinner gasket has less compressibility and therefore the manifold gets a more even interface with the head and no leak.


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PostPosted: Mon Jul 09, 2018 5:40 am 
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I fitted one from TD Fitchett a few years back when I swapped the inlet manifold. It hasn't leaked ever since.

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Meetings take place on the 1st Wednesday of every month at The Hollies Sports & Social Club, 12 Hough Lane, Bramley, Leeds, LS13 3NE
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PostPosted: Mon Jul 09, 2018 8:19 am 
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The redish gaskets were the ones that are in "payen" gasket sets therefore good quality. You to get spurious makes of gasket sets years ago and they would not either :( I shudder to think of all the gaskets i have thrown away over the years.

Tony.

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PostPosted: Mon Jul 09, 2018 8:46 am 
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Reddish = asbestos containing gasket.

It was good stuff in so many ways, that asbestos!!


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PostPosted: Mon Jul 09, 2018 10:22 am 
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Quote:
Both 1850 and Sprint inlets have in my opinion a missing bolt; ideally they both need another in the bottom right corner to effect a good seal to the water jacket. My thinking is a thicker gasket is able to be compressed by the bolts and should therefore be a better option...EXCEPT in the bottom right hand corner where the missing bolt cannot do its job. A thinner gasket has less compressibility and therefore the manifold gets a more even interface with the head and no leak.
I think the thicker gaskets can also prevent the O ring between the head and the manifold getting sufficient clamp to stop the front waterway leaking into no #1 inlet.
I'd like to meet whoever left that long waterway slot in the head at the rear and shake them warmly by the neck!

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