Mechanical refurbishment of Simson S51b

Once the electrical problems have been resolved (ignition switch and wiring errors),
unfortunately, we had to start solving other problems.

Oil was pouring everywhere ...

The lighting coil is also charred ...

Engine out

A little oil mud on the bottom

but really small ...

The metal chips on the oil drain screw do not do much good ...

Even when put up, it didn't look nicer

Like all other seals, oil was spilled at the kick arm.

I started to clean it in a big plastic box

It's the result of half an hour of screaming ...

Finally 2 Liter Brigéciol and after 2 days of screaming it became ...

It is mandatory to use a special tool for the flywheel to remove it!

Magnets can crush when knocked. The crankshaft will not thank you either!

The roll towards the cylinder head is the shorted ...

The crankshaft seal is protruding ... I think it should be flat ... It can be created by plugging in ...

A true specialist is: insulating tape and cracked wire. It's the reason that the machine sometimes stops ...

It's already stripped here

The gears look good here.

The clutch basket is also visible.

The lamellas are strange enough ...

Crankshaft Gear ... Well, this is the hardest thing to remove carefully.

I needed a few new zigzag pliers for the others.

The gearbox is already visible

Everything looks crap in it ...

Parts collected...

A fact laughing at lunch?

Now, in the gearbox, everything was drooling that could only drool.

All shafts worn out ... Wonder if it didn't change properly.

Even the shift drum was drooling...

The cylinder also blows out a bit ...

Look inside:

It's quite sooty.

There might have been a lot of oil in the gasoline. And what went wrong with the crankshaft with faulty seals.

Nice colorful piston. It does it as an ornament, but not really good for anything else.

The rings still did quite well.

For the rest I had to make a block pulling tool.

8mm plate will do :).

It is guided by 12mm screws and threaded thread extension. It can be screwed into a complete right angle.

All you have to do is weld it in place.

It worked. I easily split the block with it.

A lot of oil was burned in the crankcase too.

The crankshaft and plug for trash. The bearing hangs ...

It'd rather get a new one.

It's just nicer, isn't it?

If everything is new, I also replace the roller because it was slightly scratched.

Bearings must not be hammered. You need to heat the cast and it will almost disappear!

I used socket wrenches for the rash.

I removed the bearing from the shaft with a bearing puller.

The pipe shaft is also quite worn out ...

Cleaned components are taking up more and more space.

I bought a replacement fork with shaft.

See how inaccurate all his sizes are. It simply sticks to the structure! I took it back and bought it elsewhere.

2-3mm deviations in all directions ...

The carburetor interface was slightly extended. This should not be hammered!

It should be sanded flat. Here you can see that only the two edges touch the sanding paper ...

The nozzle head was scraped with a screwdriver ...

The swimmer unfolded....

The valve moved by the throttle is pretty worn, but that's the slightest problem ...

Here the nozzles have been replaced and the carburetor has been cleaned.

I polished it a bit.

More beautiful than in his new age.

Continued on next page ...

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