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Dolly Question

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Morning all ...

 

I have searched through the old posts but can't find the answer to this..... apologies if I haven't looked properly.

 

Why do some dollies have a nut or a stud on the top and some dont?   I have 2 on the back of my boat and one has a nut or a stud on the top and one doesnt. What is the stud bit for? 

Sorry if that is a stupid question !!

 

Not important - just wondering what it was for.

 

Thanks.

 

BMP

 

 

 

 

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You will probably find that the one with the 'nut' on top is actually a vent for the fuel tank and will contain a gauze to stop fire flash-back.

 

Does the stud / nut like this ?

 

Image result for narrowboat mooring bollard with fuel vent

Edited by Alan de Enfield
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Beat me to it! Yes, one of ours has such a protuberance, and it is a diesel-tank breather.

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2 minutes ago, Alan de Enfield said:

You will probably find that the one with the 'nut' on top is actually a vent for the fuel tank and will contain a gauze to stop fire flash-back.

Glad I asked now - I would never have worked that out !!

 

Thanks both for the quick replies.

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1 minute ago, bmp said:

Glad I asked now - I would never have worked that out !!

 

Thanks both for the quick replies.

No problem - every day is a school-day.

The day you stop learning is the day you die.

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6 minutes ago, Alan de Enfield said:

You will probably find that the one with the 'nut' on top is actually a vent for the fuel tank and will contain a gauze to stop fire flash-back.

 

Does the stud / nut like this ?

 

Image result for narrowboat mooring bollard with fuel vent

 

No mine just looks like a nut on the top and can't see any holes or vents.  I will have to look closer when I go back at the weekend.

 

 

Edited by bmp
typo ...

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IMG_0356.jpg.d8a5b99b2e616b99cef38c14ef4a03eb.jpg

 

Just checked a photo and yes mine does have a hole / vent in it.  I hadn't noticed that.

 

Thanks for your help.

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They often have two holes at 60 degrees to each other. It is good practice to ensure both holes are located (pointing forwards) in such a way that it will be more difficult for  water leaking through lock gates to get into the tank. If that is not possible then carry something like a cut off detergent bottle with no bottom that you can pop over the dolly when such water ingress is likely. (Tip given to me by a member of BCF).

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1 minute ago, Tony Brooks said:

They often have two holes at 60 degrees to each other. It is good practice to ensure both holes are located (pointing forwards) in such a way that it will be more difficult for  water leaking through lock gates to get into the tank. If that is not possible then carry something like a cut off detergent bottle with no bottom that you can pop over the dolly when such water ingress is likely. (Tip given to me by a member of BCF).

Looks like mine is pointing backwards. Can it be turned around?  If not I will take your advice on the detergent bottle.

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7 minutes ago, bmp said:

Looks like mine is pointing backwards. Can it be turned around?  If not I will take your advice on the detergent bottle.

You could possibly take it out, put in a spacer (washer) the thickness of 1/2 a turn and put it back in and see if it them 'points' forward.

 

Try it and see - nothing lost (unless you drop it overboard)

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Some, but not yours, come with a lock nut. They are easy. Undo half a turn and tighten lock nut. I would see if I could find a soft sump plug washer to fit as per Alaan's post if mine were like yours.

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30 minutes ago, Alan de Enfield said:

You could possibly take it out, put in a spacer (washer) the thickness of 1/2 a turn and put it back in and see if it them 'points' forward.

 

Try it and see - nothing lost (unless you drop it overboard)

 

Will try that next weekend and see if I can turn it around.

 

Thanks again for the help and advice.

 

 

 

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29 minutes ago, Tony Brooks said:

Some, but not yours, come with a lock nut. They are easy. Undo half a turn and tighten lock nut. I would see if I could find a soft sump plug washer to fit as per Alaan's post if mine were like yours.

Most flame arrestors in dollies seem to have a 1/2" BSP thread. This needs a washer 21mm across the inside diameter and 0.9 mm thick to turn it half a turn (0.825" major diameter and 14 threads per inch). https://www.connect-consumables.co.uk/product/36808 are 22mm ID and 1.5mm thick, but copper and should crush down to give half a turn of thickness. A friendly garage might give you one if you ask nicely.

 

Jen

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59 minutes ago, bmp said:

IMG_0356.jpg.d8a5b99b2e616b99cef38c14ef4a03eb.jpg

 

Just checked a photo and yes mine does have a hole / vent in it.  I hadn't noticed that.

 

Thanks for your help.

I see your vent is painted. Need to be careful not to block the gauze when repainting.

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1 minute ago, David Mack said:

I see your vent is painted. Need to be careful not to block the gauze when repainting.

No - it is just the photo not showing it up very well. It is still silver and not painted.  But good advice for the future. I am sure I would have just painted over it !

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57 minutes ago, bmp said:

No - it is just the photo not showing it up very well. It is still silver and not painted.  But good advice for the future. I am sure I would have just painted over it !

And watch out for spiders nesting in the gauze, they can block the vent which can in turn cause a lack of air into the tank, as you use fuel in the engine. This can make an engine stop.

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1 hour ago, Jen-in-Wellies said:

Most flame arrestors in dollies seem to have a 1/2" BSP thread. This needs a washer 21mm across the inside diameter and 0.9 mm thick to turn it half a turn (0.825" major diameter and 14 threads per inch). https://www.connect-consumables.co.uk/product/36808 are 22mm ID and 1.5mm thick, but copper and should crush down to give half a turn of thickness. A friendly garage might give you one if you ask nicely.

 

Jen

Thanks Jen for the detailed reply 👍🏻

 

I am am glad I asked the “stupid” question now. 

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2 hours ago, Tony Brooks said:

They often have two holes at 60 degrees to each other. It is good practice to ensure both holes are located (pointing forwards) in such a way that it will be more difficult for  water leaking through lock gates to get into the tank. If that is not possible then carry something like a cut off detergent bottle with no bottom that you can pop over the dolly when such water ingress is likely. (Tip given to me by a member of BCF).

I have often covered deck fillers in leaky locks as a precaution  but never even given the vent a thought. Top tip that..

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6 minutes ago, Stilllearning said:

And watch out for spiders nesting in the gauze, they can block the vent which can in turn cause a lack of air into the tank, as you use fuel in the engine. This can make an engine stop.

Not a big fan of spiders !! Will gladly evict any I find in there !

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Is there a way of fixing the beast in position immovably once pointing the right way, blob of weld, perhaps? If not, buying a locking filler cap is a waste of money...

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1 minute ago, BruceinSanity said:

Is there a way of fixing the beast in position immovably once pointing the right way, blob of weld, perhaps? If not, buying a locking filler cap is a waste of money...

Tis a very small diameter 'hole', no-way would you get even a small hose pipe-down there (microbore window screen washer pipe - maybe)

 

You could pour sugar or water down there if you were so inclined but it would be a slow job.

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27 minutes ago, Alan de Enfield said:

Tis a very small diameter 'hole', no-way would you get even a small hose pipe-down there (microbore window screen washer pipe - maybe)

 

You could pour sugar or water down there if you were so inclined but it would be a slow job.

It will be about a 19mm hole, big enough for a 8-10mm hose.

Edited by Robbo

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2 hours ago, BruceinSanity said:

Is there a way of fixing the beast in position immovably once pointing the right way, blob of weld, perhaps? If not, buying a locking filler cap is a waste of money...

As the breathers are usually brass and the dolly steel or cast iron not really. You could try Locktite.

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