mtb
New member
update tug\'s gearbox
Just got back from the tug , it turned out to be an alright sort of job in terms of struggle that is .
Any way to get at the reduction gear casing I had to lift the box , I thought about the best way to achieve this, and by using a strong length of timber across the hand rails and a chain hoist the actual lifting to turn the box into a position to work on was no problem.
Even getting the nuts and bolts undone was done with ease.
As soon as I took the input shaft bearing cover off I could see the remains of the bearing , to say it was knackered is an under statement.
While removing the main cover all the debris fell to the bottom of the casing , mind you no fears re this as its a separate casing from the main box and the oil return goes through a filter before it feeds back into the system .
I have brought the main gear back ( very heavy ) to press the coupling off so that I can change the bearing as this has movement in it .
The main gear has a bearing each end so although the inner one seems fine I will change that one as well.
I'm very lucky that Parsons make such a strong box because there are no problems re gears !!!.
I have to improve on the lubricating system which to my way of thinking needs to also feed the reduction gear from the main oil feed input pipe.
I don't like the copper pipes connecting things up and this I think is the problem area .
As you properly know copper will work harden both with age and movement , once things become rigid then sooner or later some thing will give as in this case .
I know I could simply anneal the pipe work but nnaaaaaaaaaarrrrrr cant just leave it like that.
So I'll get hydraulic hoses made and then have the peace of mind , also originally there was an low oil pressure alarm fitted ( long since disconnected ) but still piped in the oil line . I shall have to see if It works but I think its 12volts as per the original Rollroyce engine set up so it could work out cheaper to buy a modern one rather than muck about .
Right then off with the coupling then up to Cravens in Boston to sort out new bearings.
Mick
http://homepage.ntlworld.com/boats
I want a big steel ex trawler / tug v / cheap or swap for tug
Just got back from the tug , it turned out to be an alright sort of job in terms of struggle that is .
Any way to get at the reduction gear casing I had to lift the box , I thought about the best way to achieve this, and by using a strong length of timber across the hand rails and a chain hoist the actual lifting to turn the box into a position to work on was no problem.
Even getting the nuts and bolts undone was done with ease.
As soon as I took the input shaft bearing cover off I could see the remains of the bearing , to say it was knackered is an under statement.
While removing the main cover all the debris fell to the bottom of the casing , mind you no fears re this as its a separate casing from the main box and the oil return goes through a filter before it feeds back into the system .
I have brought the main gear back ( very heavy ) to press the coupling off so that I can change the bearing as this has movement in it .
The main gear has a bearing each end so although the inner one seems fine I will change that one as well.
I'm very lucky that Parsons make such a strong box because there are no problems re gears !!!.
I have to improve on the lubricating system which to my way of thinking needs to also feed the reduction gear from the main oil feed input pipe.
I don't like the copper pipes connecting things up and this I think is the problem area .
As you properly know copper will work harden both with age and movement , once things become rigid then sooner or later some thing will give as in this case .
I know I could simply anneal the pipe work but nnaaaaaaaaaarrrrrr cant just leave it like that.
So I'll get hydraulic hoses made and then have the peace of mind , also originally there was an low oil pressure alarm fitted ( long since disconnected ) but still piped in the oil line . I shall have to see if It works but I think its 12volts as per the original Rollroyce engine set up so it could work out cheaper to buy a modern one rather than muck about .
Right then off with the coupling then up to Cravens in Boston to sort out new bearings.
Mick
http://homepage.ntlworld.com/boats
I want a big steel ex trawler / tug v / cheap or swap for tug
