Stern gland grease tube fitting type/size?

[Akestor]

Hello,
Its time to make a new tube that goes from greaser inlet valve to stern gland, as the plastic tube blows of from the fitting (grease valve side). So greasing have become a real PITA...

Thing is i can't take with me the fitting as a sample for making a new tube at the shop because i will probably sink if i do that.

Do you have any idea of what size and thread type the fitting at the pic is so i can tell the tube shop? Its a Westerly Longbow 31.

 

[PuffTheMagicDragon]

At a guess I would say that the fitting is probably 1/8 BSP.
Removing it - if there is grease in the bearing - would not let in anything more than a few drips of water. If in doubt just wind some turns of tape around so that the hole that is visible in the photo is covered.
If it were my boat I would replace the fitting with one that has compression olives and that would accept the semi-rigid nylon tubing (usually black) that is used for pneumatic equipment. That nylon tubing can take the 'pressure' from the greaser and, unlike the old tubing in the photo, is not affected by the grease.

 

[Akestor]

At a guess I would say that the fitting is probably 1/8 BSP.
Removing it - if there is grease in the bearing - would not let in anything more than a few drips of water. If in doubt just wind some turns of tape around so that the hole that is visible in the photo is covered.
If it were my boat I would replace the fitting with one that has compression olives and that would accept the semi-rigid nylon tubing (usually black) that is used for pneumatic equipment. That nylon tubing can take the 'pressure' from the greaser and, unlike the old tubing in the photo, is not affected by the grease.

Thanks for the idea. Looks like there is no option but take the fitting at the shop.
I will cut the cork from a wine bottle:very_drunk:, jam it in the hole and then tape it several rounds with duct tape.

 

[scottie]

Buy or borrow 1/8 & 1/4 tapered plugs as a temporary measure if you are worried
Both are internationally used I believe

 

[penberth3]

Buy or borrow 1/8 & 1/4 tapered plugs as a temporary measure if you are worried
Both are internationally used I believe

Then you'll know what thread it is!

 

[Akestor]

Thanks good to know it is possibly either 1/8 or 1/4 !

 

[penberth3]

Thanks good to know it is possibly either 1/8 or 1/4 !

Haven't you got a ruler?

 

[bristoljim]

1/8 bsp fine thread .383" outside diameter. 1/4 bsp quite a coarse thread .518" outside diameter - you shouldnt need a micrometer !

Jim

 

[Akestor]

Thanks, i assume i should additionally find whether is tapered or parallel type threads!

 

[Akestor]

Yes! and a calliper also, but i thought that they might be several thread types, that even if i get the diameter, i ll miss the thred type

 

[scottie]

Thanks, i assume i should additionally find whether is tapered or parallel type threads!

The idea with tapered plugs is that they will block both parallel and tapered bosses whilst you take the assembly to a hydraulic hose supplier as a new hose is made up

 

[Akestor]

1/8 bsp fine thread .383" outside diameter. 1/4 bsp quite a coarse thread .518" outside diameter - you shouldnt need a micrometer !

Jim

I measured it, the calliper measures inches with decimal system, it has 10 equal subdivisions instead of 1/8, 1/16 etc.
The result is 0.430 with this digital calliper. I uninstalled the tube and fitting and going to make a new one tomorrw with this as sample to be sure the new fitting is going to be the proper one