Sump plug seal
Discussion
Most decent motor factors will carry crushable copper sealing rings in a variety of sizes, trick is knowing what size you need without having to drop the bung and physically take it in (should be ok to do this if it's a Serp engine but asking for extra work if a pre-serp)... the magnetic hex key plug from Steve Heath has a re-usable rubber seal integral to it and is a nice simple upgrade that reduces the risk of the bung being spun out on any bottoming events 
Naybr said:
I bought a Steve Heath sump plug and found that it dripped pretty badly until I used a copper washer with it.
Strange that as the one in my Wedge has been there for over 10 years and probably 50 oil changes...The sump surface does need to be clean and smooth for the seal to work correctly. Might be worth running some emery paper over it next time.
For a rubber “O” ring to work in this type of application, at least one of the sealing faces (preferably both) should be machined with a concave profile to receive the “O” ring.
I have not seen the magnetic sump plug from Steve Heath but I am sure this basic rule will have been considered in its design.
Originally the “O” ring was not designed to work as a face seal & especially not if a thread is present, its really meant for internal bore sealing tasks and it works very well in these applications.
Think about how an “O” ring seals an injector.
In my former life working on hydraulic plant, experience taught me to use Dowty seals in applications similar to our sump plug.
That's because it seals the path the oil takes up the thread, rather than trying to hold it back at the jointing faces.
However these days the Stat–O–Seal which works in the same way as a Dowty has all but replaced them.
The Stat–O–Seal is very simply the best sealing washer available for this type of application.
It consists of a synthetic rubber “O” ring mechanically locked to the I.D. of an aluminium washer.
When tightened, the “O” ring is compressed, forcing the sealing surfaces around the bolt shank, that's why it works so well where a thread is present.
They will form a positive seal over a temperature range of –85° to +450° F.
They provide the advantages of an “O” ring type seal without the necessity of machining “O” ring grooves into the part.
In any application where you are now using a copper or aluminium sealing washer, the Stat–O–Seal will do a better job.
Just make sure you get the correct size, the Stat–O–Seal should have an I.D. that allows you to loosely wind it onto the thread.
If its too loose it wont seal, if its too tight on the thread you run the risk of shearing the seal when you tighten it up.
Get the correct size and the Stat–O–Seal will never leak a drop, I've seen them hold back 1000 bar (14500 psi) so they shouldn't have any trouble with the weight of 5 litres of engine oil.
A Stat–O–Seal may be overkill, but they are very cheap, they work and are designed to seal a threaded fitting like our sump plugs.
I have not seen the magnetic sump plug from Steve Heath but I am sure this basic rule will have been considered in its design.
Originally the “O” ring was not designed to work as a face seal & especially not if a thread is present, its really meant for internal bore sealing tasks and it works very well in these applications.
Think about how an “O” ring seals an injector.
In my former life working on hydraulic plant, experience taught me to use Dowty seals in applications similar to our sump plug.
That's because it seals the path the oil takes up the thread, rather than trying to hold it back at the jointing faces.
However these days the Stat–O–Seal which works in the same way as a Dowty has all but replaced them.
The Stat–O–Seal is very simply the best sealing washer available for this type of application.
It consists of a synthetic rubber “O” ring mechanically locked to the I.D. of an aluminium washer.
When tightened, the “O” ring is compressed, forcing the sealing surfaces around the bolt shank, that's why it works so well where a thread is present.
They will form a positive seal over a temperature range of –85° to +450° F.
They provide the advantages of an “O” ring type seal without the necessity of machining “O” ring grooves into the part.
In any application where you are now using a copper or aluminium sealing washer, the Stat–O–Seal will do a better job.
Just make sure you get the correct size, the Stat–O–Seal should have an I.D. that allows you to loosely wind it onto the thread.
If its too loose it wont seal, if its too tight on the thread you run the risk of shearing the seal when you tighten it up.
Get the correct size and the Stat–O–Seal will never leak a drop, I've seen them hold back 1000 bar (14500 psi) so they shouldn't have any trouble with the weight of 5 litres of engine oil.
A Stat–O–Seal may be overkill, but they are very cheap, they work and are designed to seal a threaded fitting like our sump plugs.
Chimpaholic said:
For a rubber “O†ring to work in this type of application, at least one of the sealing faces (preferably both) should be machined with a concave profile to receive the “O†ring.
I have not seen the magnetic sump plug from Steve Heath but I am sure this basic rule will have been considered in its design.
Originally the “O†ring was not designed to work as a face seal & especially not if a thread is present, its really meant for internal bore sealing tasks and it works very well in these applications.
Think about how an “O†ring seals an injector.
In my former life working on hydraulic plant, experience taught me to use Dowty seals in applications similar to our sump plug.
That's because it seals the path the oil takes up the thread, rather than trying to hold it back at the jointing faces.
However these days the Stat–O–Seal which works in the same way as a Dowty has all but replaced them.
The Stat–O–Seal is very simply the best sealing washer available for this type of application.
It consists of a synthetic rubber “O†ring mechanically locked to the I.D. of an aluminium washer.
When tightened, the “O†ring is compressed, forcing the sealing surfaces around the bolt shank, that's why it works so well where a thread is present.
They will form a positive seal over a temperature range of –85° to +450° F.
They provide the advantages of an “O†ring type seal without the necessity of machining “O†ring grooves into the part.
In any application where you are now using a copper or aluminium sealing washer, the Stat–O–Seal will do a better job.
Just make sure you get the correct size, the Stat–O–Seal should have an I.D. that allows you to loosely wind it onto the thread.
If its too loose it wont seal, if its too tight on the thread you run the risk of shearing the seal when you tighten it up.
Get the correct size and the Stat–O–Seal will never leak a drop, I've seen them hold back 1000 bar (14500 psi) so they shouldn't have any trouble with the weight of 5 litres of engine oil.
A Stat–O–Seal may be overkill, but they are very cheap, they work and are designed to seal a threaded fitting like our sump plugs.
Stat-o-seal??....where from and what size would fit the plug on a 96 4.0 Chim I have not seen the magnetic sump plug from Steve Heath but I am sure this basic rule will have been considered in its design.
Originally the “O†ring was not designed to work as a face seal & especially not if a thread is present, its really meant for internal bore sealing tasks and it works very well in these applications.
Think about how an “O†ring seals an injector.
In my former life working on hydraulic plant, experience taught me to use Dowty seals in applications similar to our sump plug.
That's because it seals the path the oil takes up the thread, rather than trying to hold it back at the jointing faces.
However these days the Stat–O–Seal which works in the same way as a Dowty has all but replaced them.
The Stat–O–Seal is very simply the best sealing washer available for this type of application.
It consists of a synthetic rubber “O†ring mechanically locked to the I.D. of an aluminium washer.
When tightened, the “O†ring is compressed, forcing the sealing surfaces around the bolt shank, that's why it works so well where a thread is present.
They will form a positive seal over a temperature range of –85° to +450° F.
They provide the advantages of an “O†ring type seal without the necessity of machining “O†ring grooves into the part.
In any application where you are now using a copper or aluminium sealing washer, the Stat–O–Seal will do a better job.
Just make sure you get the correct size, the Stat–O–Seal should have an I.D. that allows you to loosely wind it onto the thread.
If its too loose it wont seal, if its too tight on the thread you run the risk of shearing the seal when you tighten it up.
Get the correct size and the Stat–O–Seal will never leak a drop, I've seen them hold back 1000 bar (14500 psi) so they shouldn't have any trouble with the weight of 5 litres of engine oil.
A Stat–O–Seal may be overkill, but they are very cheap, they work and are designed to seal a threaded fitting like our sump plugs.
Chimpaholic, is that a quote from a website? Bits of it are identical to this..
http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
They do look good, might stop the leaky sump on my T2 camper...
Rich
http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
They do look good, might stop the leaky sump on my T2 camper...
Rich
Edited by richy759 on Tuesday 26th October 15:54
richy759 said:
Chimpaholic, is that a quote from a website? Bits of it are identical to this..
http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
Rich
Correct, well spotted http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
Rich
Saves time typing.
You don't think I spend hours rattling off all this bull do you?
The facts still stand though.
The Dowty or Stat-O-Seal is the right part for the job, ask any hydraulic engineer.
Chimpaholic said:
richy759 said:
Chimpaholic, is that a quote from a website? Bits of it are identical to this..
http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
Rich
Correct, well spotted http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
Rich
Saves time typing.
You don't think I spend hours rattling off all this bull do you?
The facts still stand though.
The Dowty or Stat-O-Seal is the right part for the job, ask any hydraulic engineer.
richy759 said:
Chimpaholic said:
richy759 said:
Chimpaholic, is that a quote from a website? Bits of it are identical to this..
http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
Rich
Correct, well spotted http://www.speedflowshop.co.uk/stat-o-seal-94-c.as...
Rich
Saves time typing.
You don't think I spend hours rattling off all this bull do you?
The facts still stand though.
The Dowty or Stat-O-Seal is the right part for the job, ask any hydraulic engineer.
Had you all going for months with my copy paste postings though.
Here I am playing with my toy cars again
As you can see I'm actually 11 years old, sorry have to go my mum is calling me for dinner.
Alexdaredevilz said:
Are these seals any good for the rad top seal?
If you mean the threaded plug that's sometimes in the top of the rad then yes, the correct size Dowty will create a good seal.ACTUALLY A DOWTY HAS MAY USES.
An old mechanic friend of mine once told me they can also be used to delay the embarrassing problem of an early over excited release during the throws of passion.
But I never could find one small enough to fit me
The sump plug seal is not an O ring and replacing it with an O ring will cause it to leak. It is a square section neoprene gasket that seals between the plug and the sump face.
I've used the Dowty seals on the Cooltester and they are pretty good providing you get the right size and the surfaces are good.
If the surface is bad, even the Dowty seal can leak.
I've used the Dowty seals on the Cooltester and they are pretty good providing you get the right size and the surfaces are good.
If the surface is bad, even the Dowty seal can leak.
Golflion said:
Chimpaholic said:
For a rubber “O†ring to work in this type of application, at least one of the sealing faces (preferably both) should be machined with a concave profile to receive the “O†ring.
I have not seen the magnetic sump plug from Steve Heath but I am sure this basic rule will have been considered in its design.
Originally the “O†ring was not designed to work as a face seal & especially not if a thread is present, its really meant for internal bore sealing tasks and it works very well in these applications.
Think about how an “O†ring seals an injector.
In my former life working on hydraulic plant, experience taught me to use Dowty seals in applications similar to our sump plug.
That's because it seals the path the oil takes up the thread, rather than trying to hold it back at the jointing faces.
However these days the Stat–O–Seal which works in the same way as a Dowty has all but replaced them.
The Stat–O–Seal is very simply the best sealing washer available for this type of application.
It consists of a synthetic rubber “O†ring mechanically locked to the I.D. of an aluminium washer.
When tightened, the “O†ring is compressed, forcing the sealing surfaces around the bolt shank, that's why it works so well where a thread is present.
They will form a positive seal over a temperature range of –85° to +450° F.
They provide the advantages of an “O†ring type seal without the necessity of machining “O†ring grooves into the part.
In any application where you are now using a copper or aluminium sealing washer, the Stat–O–Seal will do a better job.
Just make sure you get the correct size, the Stat–O–Seal should have an I.D. that allows you to loosely wind it onto the thread.
If its too loose it wont seal, if its too tight on the thread you run the risk of shearing the seal when you tighten it up.
Get the correct size and the Stat–O–Seal will never leak a drop, I've seen them hold back 1000 bar (14500 psi) so they shouldn't have any trouble with the weight of 5 litres of engine oil.
A Stat–O–Seal may be overkill, but they are very cheap, they work and are designed to seal a threaded fitting like our sump plugs.
Stat-o-seal??....where from and what size would fit the plug on a 96 4.0 Chim I have not seen the magnetic sump plug from Steve Heath but I am sure this basic rule will have been considered in its design.
Originally the “O†ring was not designed to work as a face seal & especially not if a thread is present, its really meant for internal bore sealing tasks and it works very well in these applications.
Think about how an “O†ring seals an injector.
In my former life working on hydraulic plant, experience taught me to use Dowty seals in applications similar to our sump plug.
That's because it seals the path the oil takes up the thread, rather than trying to hold it back at the jointing faces.
However these days the Stat–O–Seal which works in the same way as a Dowty has all but replaced them.
The Stat–O–Seal is very simply the best sealing washer available for this type of application.
It consists of a synthetic rubber “O†ring mechanically locked to the I.D. of an aluminium washer.
When tightened, the “O†ring is compressed, forcing the sealing surfaces around the bolt shank, that's why it works so well where a thread is present.
They will form a positive seal over a temperature range of –85° to +450° F.
They provide the advantages of an “O†ring type seal without the necessity of machining “O†ring grooves into the part.
In any application where you are now using a copper or aluminium sealing washer, the Stat–O–Seal will do a better job.
Just make sure you get the correct size, the Stat–O–Seal should have an I.D. that allows you to loosely wind it onto the thread.
If its too loose it wont seal, if its too tight on the thread you run the risk of shearing the seal when you tighten it up.
Get the correct size and the Stat–O–Seal will never leak a drop, I've seen them hold back 1000 bar (14500 psi) so they shouldn't have any trouble with the weight of 5 litres of engine oil.
A Stat–O–Seal may be overkill, but they are very cheap, they work and are designed to seal a threaded fitting like our sump plugs.
Where do they sell the Dowty washers Dave?
Pupp said:
Right, great, fab... now the bung seal is sorted, can someone get them to make a decent gasket for the sump pan itself? Did those fabled 'rubber' ones ever materialise?
Do you mean like this?http://cgi.ebay.co.uk/TVR-MARCOS-MGB-MORGAN-ROVER-...
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