Easy maintenance CL72 _ I just want to replace the front sprocket.

This image is the front sprocket was removed. This is bad extent than Rear.It's missing to teeth are sharp.

Scars of the chain is attached to the crank case.

This is the engine side.
Oil seal deteriorates oil is blurred. It seems to be the automatic oiling device.

Genuine parts of this neighborhood can not be obtained.
But, repair kit has been obtained. By looking for the Yahoo! Auctions.
Oil seal is in the set a lot.

This is the way to take the oil seal without disassembling the engine. ↓
I prying with a flathead screwdriver No. 0 made of PB.

In this way also twisted many times if you remove .

This image is the back side of the oil seal. ... The bearing is dirty
Engine of this era is the oil is dirty easily. Piston ring is thick, so ring is fluttering?


At the same, many oil consumption, exhaust gas is smoky. Because without the valve stem seal, the oil ring is large.
New car was also smoky. It's smoky even if the overhaul.

Old car it is often said we should put the high viscosity oil from clearance in the engine is wide. However, this is not even layers when I measured by decomposing the engine.
Maybe the old days of the oil pump is a gear pump. So Will is high viscosity oil for the oil pump was necessary.
Incidentally, now there are many trochoid pump adopted car. Airtight good.

Oil seal exchange completion.
I can be attached to finally sprocket.
I got the dead stock of genuine parts. Expensive.
Old-fashioned packaging.

Installation completion.
I should be cleaning the soil, before installing the chain. Sand would come with.

Easy maintenance CL72 _ It is not possible to assemble the brake shoes.

I was assembling the tire. Brake shoe , wheel bearings ware also.
I was assembling the brake panel and wheel.
However, you can not assembling　!

This shoe is a little thicker.
Rear was able to insert, but the front does not enter.

There is no way.
I made a simple jig for fixing, was cut by a lathe.

Fixed body only.
Shoe is free. It is only closed by the return spring.

It is dangerous when the shoe is open like a centrifugal clutch by centrifugal force. I was shaving at low rotation.

It is now possible to insert the brake drum where I cut 4mm from chipping position.
But still it is not scraped the entire circumference.
Shoe does not hit only partially when the wear early.
I think roundness by shaved has been corrected.

At the same I've noticed.
CL72 shoe is one side is a hole, but the recent shoe one side is semi-circular.
↓ This is SR400

CL72 is not entirely contact until the initial wear is finished because it is fixed without flexibility by hole and the pin.
SR of the shoe's floating. Some extent of misalignment is absorbed.
I think that it has become on the whole surface contact at an early stage.

Therefore, the stability of the braking force is superior recent shoe.

If one is a pin hole, in the case of motor vehicles, it is likely to steering away around without permission.

I got a speedometer cable and a brake wires . It was reproduct.

I was finally able to assemble these.

Easy maintenance CL72 _ Wheel bearing one side free

I have replaced the sprocket. The following is a replacement of the bearings.

Here also is a point which is different from the modern bike.
Usually bike wheel bearing's a "contact both sides", but this is one side free.

今= Now    ここに隙間= gap here

Recently, I have been pulled by welding. When removing the wheel bearings

I assembled also speedometer gear. With washed and grease up .

There was general-purpose products to individual oil seal.
As part number that was previously published.

Completion

Easy maintenance CL72 _ Found a trace the chain off.

The rear sprocket is worn, like a ratchet gear. This needs to be replaced.

The important thread of the vehicle, has been applied is loosening measures.
The lock washer in the case of this.
Remove the lock and remove the nut.
Why this nut is so shaved?

Remove the nut. There is a hole for the wire lock.
Use this hole, if the wire lock, I do not need the lock washer.
It becomes lighter only a little. SR400 also a lock washer type.You opened this hole?
But it may be better of in consideration of the work time "thin U-nut of the type 3".

I nut I wanted to place a new one. However, it was impossible. The size is not a general-purpose size.
Perhaps. It's a larger nut size for drilling of wire lock.
SR nut also the same. It's M8 Yet diagonal 17mm.

There is no way. Fixed a hole in one by one tap. And scraping to the raised place is fixed in the file of the outline.
Very time-consuming.

The side of the stud bolt was fixed with dice.
I noticed during that. "There is a trace! Chain is out."
Did also made the chain is a wound of the nut is that? !
Oh, intense.
As it is often the case by bicycle. But, it is not that I've seen on a motorcycle.
It would have been a catastrophe.
This was running with very loose chain .

Many times than usual also took time.
Sprockets genuine new was available.
The chain size is 530. If the original part is no longer available, it can be manufactured if processing the general-purpose products of blank for industrial.

We use the blank of Tsubakimoto Chain Co.. Compared to that of the bike, clearance of "roller diameter" and "diameter of the sprocket of the valley" is small. But it has no problems using it for now.

Repair of agricultural machinery of the water pump Pt2

I did the repair of farm equipment of the water pump. Following the last time.
The other day, I was cracking the bearing. Then it was the water pump bearing of exclusive goods.

To be used to repair handmade billet shaft.
I was to contact customer at this point, because the cost increases.
He said ok.
go.

I have designed it. I make this shaft. Use the manual lathe. (But there missing dimension.)

The material of the oil seal is selected nitrile rubber. It is water-resistant.

In order to assemble these I made a hole in the housing.

Make a pin hole

Enlarge oil seal hole.
Just the size of the end mill there was no. So I was boring in the boring head.
Whether to stop the leakage of cooling water it's up to the inner surface of the hole.

This pin hole is for fixing the stopper of the bearing.

Of course, this bearing stopper is what I made.

We'll do the rust removal of the impeller in the work and simultaneously.
Soak the impeller in the chemical.
Large rust of mass in advance it has removed with a wire brush.

I was very cleanly remove the rust of this. Protective coating is marked by rust removal liquid.
The soaked time 2 days.

Shaft carved on a lathe.
The material is SUS304, but I wanted really to hardening of SUS440C.

This image is all assembly completion.
Of the pulley and the impeller fixed press-fit only.
I'm a little worried. However, about against the water resistance, it will be the endured.

Impeller and housing clearance had slightly spread than normal.
It is necessary to rework if any butting during assembly.

Completion

Repair of agricultural machinery of the water pump Pt1

It has broken rusty that farm equipment of the water pump shaft.

I was asked to repair the old man.
The old man says. "I have refused to repair agricultural machinery shop. By repair this, I want to be facing him."

Indeed,
I do not know this structure, but I'll try.

First, I remove the pin. It is I'm pinching in photos of the first sheet.
And I tried to overtake the bearing, by puller. This is a hard fit. It does not move.

It was able to be pressed strongly by a hydraulic press.
Water pump impeller, drive pulleys of the flange, also hard fit.
This is also using a hydraulic press.It is impossible with puller.

This is the bearing that came out.
What is this?

This has ridges groove of the ball to the shaft itself.
I never saw such a bearing.

But ... it's very rusty.

This seems to be the exclusive goods. The name water pump bearings.
Only genuine parts.
You will not be able to find a general-purpose products.

This seems common in automobiles and farm equipment.
I have fiddled just motorcycle. It becomes assembly exchange's automobile.
So I did not know.
There was a manufacturer's site. This direction
This image has been taken from the manufacturer site.