THE ATTEMPTED “RESTORATION” OF A TARPEN 2 STROKE ENGINE AND AN ATTEMPT TO RE UNITE IT WITH A TARPEN DYNAMO
PART 2 – FIRST ATTEMPTS continued
BLOCK OF RUBBER INTENDED FOR JEWELLERS
£ 5-99 ON EBAY !
Can not be that hard says I ( first mistake )
Clamp between two sheets of ply, hole saw through the centre ,wood drill for the flange holes ,fretsaw to cut out the main circle .
Job Done ? what do you think !
So as described above ,A suitable drive coupling was made and fitted as per the picture below
The engine is actually running in the above picture . a video of the engine succesfully running can be seen HERE
Now refer back to the picture in page 1 – although the engine was now running it had problems , Notice the choke was fully closed .
This was the only way the engine would start and run ! , it ran but badly , also notice the oil on the floor below the engine ( from the exhaust ) not good from keeping the wife happy point of view ! .
So now I knew the coupling would work ,I dismantled the engine .
Head off , Cylinder off , complete de coke ,made gasket for between the cylinder and the crankcase ,new head gasket ,stripped and cleaned the carb, adjusted the points ,new spark plug and many smaller “tweaks”
re assembled -and perfect – engine now runs really well so onto the “oil” problem .
The oil is coming from the exhaust ,now even though the above work reduced significantly the amount of unburnt oil it still dripped out – solution ? -re position the exhaust to face upwards !
The above exhaust was made by cutting the pipe , threading the pipe with a 1/12″ BSP thread ,fitting an adaptor down to 1/2″ BSP ,screw on a Briggs type lawnmower silencer and mounting the pipe 180 degrees the other way round on the cylinder .
Give the engine a good clean – RE assemble onto the trolley
and away it goes ( or so I thought )
PART 4 – THE START OF THE ROT
So having sorted out the running of the engine, the drive coupling and the exhaust ,the setup was re assembled and all appeared to be fine .
However under the “best laid plans of mice and men” principle
after a total of about an hours running the drive coupling
unceremoneously split into two halves across two of the drilled bolt holes and fell off (or rather spun off ! )
Oh “Blast” says I !
Now obviously the rubber I used was not strong enough for the forces involved ( there is no cord reinforcing) and was not up for the job .
So onto plan B
When I bought the Tarpen 2 stroke ,the original owner had
bolted the two drive flanges together and extended the driveshaft
out from the resulting “large flange ” in order to fit a pulley 6″ along the extended shaft to drive the fan .
This setup worked OK excepting there was no way to drive anything else from the extended driveshaft so effectively it was a “Standalone” engine .
This setup was dismantled in order that the engine could be returned to its original direct drive configuration .
The first thing that occured ( but did not matter at the time) was the
original horrible Mazak fan drive pulley disintegrated when being removed ( correctly with a 3 point puller) and ended up in the bin .
So having now decided to go back along that route and duplicate the extended driveshaft setup but this time with a double pulley ( one for the fan and the other for the generator drive ) off I went .
Mazak – what is its point ? ( apart from its cheap I suppose)
so having taken all precautions including sleeving the bolts between the Flanges the results are obvious .
Engine end flange
Generator end flange with extended shaft
And the way it ended up ( even with the correct size and carefully measured key !)
I HATE MAZAK !! ( with a vengence)