EMBEE .75 DIESEL REPAIR

 

 

This little gem was sent in to us by a client in Australia asking to please make a suitable replacement con-rod as the original rods kept bending.

Here's the engine as we received it.........

First step dismantle the engine and check the rod out......

Well the gentleman wasn't kidding when he said it had a stuffed rod.......

Not to worry, we went ahead and made him a couple while we were at it so he'd have a spare......

 

The engine was then reassembled and we tried test running it.......................

Oh dear, turns out there is also a significant lack of compression.........

Then we had a second realisation. The gentleman was planning on actually flying this engine. So, we should point out, that the Embee 0.75cc engine is in fact only 0.62cc and that the engine features a rather silly "in our opinion" pressed in front housing which had a somewhat less than fantastic fit to start with. So what to do now. After talking to the client regarding the lack of compression the decision was made to rectify that and while we were at it we will just go ahead and correct the under size displacement and the insecure front housing.

 Here's the progress on the front housing correction/upgrade.

 

Now we start on the liner mods and rebore.......

Now it's time to make the tooling to manufacture the piston and contra-piston and lap them to fit.

 Here is the new piston and contra-piston, all machined to size, lapped and ready to fit.

And assembled onto the rod and into the cylinder liner.......

Now its onto reassembling them to the rest of the engine.

 

So at long last we have the finished cylinder assembly refitted to the rest of the engine. With the addition of a few drops of fresh fuel we were very pleased with the silky smooth motion and the very authoritative pop of compression that the engine is now making.

Next step is to make and fit a new backplate gasket and reassemble the backplate to the engine.

And here we have one very cute and also very healthy little Embee 0.75cc which is in fact actually 0.75cc. Now where'd that fuel bottle get to?

 

 Here she is all propped up and ready to go.

And now for the moment of truth.......................

 

 Well it starts and runs very well so we'll give it a bit of a run in to settle everything in and send her back to her owner.