Refurbershing Mamod cylinders
Posted: Sun Apr 02, 2017 5:42 pm
Hi,
Some time ago I was given quite a number of double acting oscillating cylinders with port blocks that are used on Mamod type locomotives. The friend that gave them to me said he couldn't get them to work and if they did work it was not very well.
Only a couple of the cylinder sets were of mamod manufacture the rest were either replacement ones or from Mamod copies. Not being an expert on Mamods or their clones I don't know who their manufacturers were. A number have already been worked on and fitted to models.
A locomotives made from bits and pieces.
A marine paddle engine.
A stationary engine made from a clothes rail bracket.
The engines for these models were refurbished as they were needed, it was decided to referbish the remaining engines ready for use as it would be quicker than doing them piece meal.
Some of the engines and spare parts that had been given.
A lot of the engines had been taken apart so the first job was to make up pairs.
Other than original Mamod cylinders there seemed to be two other types both having there port blocks machined with steam passageways.
The more common type.
The less common type.
Both types had issues with port size and there postion relative to the cylinder ports. These ports are visibly out of position.
It was decided to plug the ports for re-drilling and as the new ports probably not line up with the steam passageways the port blocks were machined thinner like the original Mamod ones.
Plugging the ports after machining. Left to right: original, drilled out for plug, hard soldered and cleaned up.
Close up of plugged port block.
A port block that has been re-drilled, some of the plugs can be seen.
Four finished pluuged port blocks along with a pair of Mamod cylinders and a spare. These port blocks won't be drilled yet as they migh not be used on Mamod locomotives but perhaps on a model with a different port/trunnion centre distance.
Taking the cylinders apart next.
Regards Tony.
Some time ago I was given quite a number of double acting oscillating cylinders with port blocks that are used on Mamod type locomotives. The friend that gave them to me said he couldn't get them to work and if they did work it was not very well.
Only a couple of the cylinder sets were of mamod manufacture the rest were either replacement ones or from Mamod copies. Not being an expert on Mamods or their clones I don't know who their manufacturers were. A number have already been worked on and fitted to models.
A locomotives made from bits and pieces.
A marine paddle engine.
A stationary engine made from a clothes rail bracket.
The engines for these models were refurbished as they were needed, it was decided to referbish the remaining engines ready for use as it would be quicker than doing them piece meal.
Some of the engines and spare parts that had been given.
A lot of the engines had been taken apart so the first job was to make up pairs.
Other than original Mamod cylinders there seemed to be two other types both having there port blocks machined with steam passageways.
The more common type.
The less common type.
Both types had issues with port size and there postion relative to the cylinder ports. These ports are visibly out of position.
It was decided to plug the ports for re-drilling and as the new ports probably not line up with the steam passageways the port blocks were machined thinner like the original Mamod ones.
Plugging the ports after machining. Left to right: original, drilled out for plug, hard soldered and cleaned up.
Close up of plugged port block.
A port block that has been re-drilled, some of the plugs can be seen.
Four finished pluuged port blocks along with a pair of Mamod cylinders and a spare. These port blocks won't be drilled yet as they migh not be used on Mamod locomotives but perhaps on a model with a different port/trunnion centre distance.
Taking the cylinders apart next.
Regards Tony.