This time, I will talk about the car, which once took a rest from the goshawk.
Land Cruiser starter motor riding in Kenya where the rotational force is weakening,
I've covered it twice in this blog before.
At first, the story when the solenoid switch went wrong and was replaced.
And when a contact failure occurred, I applied Tamiya contact grease and revived.
By exchanging something in the starter motor, it was revived so much that I decided to blog about it.
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17 years after purchase, my car (HZJ75) has undergone major repairs on the body, exterior, and interior.
The car on which the caretaker is riding is called the 1991 Toyota Land Cruiser (HZJ75) Trading Trupy (Truloop Carrier), a car that is rarely seen in Japan.
The engine uses a 1HZ, 4,200cc diesel non-turbo engine.
It's been 29 years since the car was manufactured this year, and it's been 17 years since the manager started riding it.
A little while ago, we made a major repair of the body, completely painted it, and replaced the interior, and it was so shiny that you couldn't think of it as a car 29 years ago.
It took more than a month from the start of this work to finally complete it. The caretaker should go to the garage as much as possible and wear coveralls to work.
When a car becomes shiny, you start to worry about small things that you didn't care about until now, and you want to fix everything.
Fine finishing is still in progress, and recently I've been tinkering with quieting and audio optimization.
I will talk about this major restoration in the future, but this time about the starter motor.
If you twist this Land Cruiser and key, the engine will start without problems, but recently the rotational force of the starter motor has dropped, so I decided to fix it this time.
Until now of starter motors
When the power dropped, I used to polish the surface of the brush, its contact area, and the kenmitator with fine sandpaper to clean it.
But lately, even if I work, the power I used to have hasn't returned.
Of course, the battery can be fully charged with an external charger, even if the battery voltage is strong.
This decline in power has been rapid in recent years.
It is very dangerous that the engine does not start during the safari, in the middle of the bush.
Here, a long time ago, although it was not a starter motor, I would like to share one of my experiences with Masai Mara.
It was more than a decade ago, the caretaker who went on a safari with his own car without fixing it, despite some poor contact of the preheating cable required to start the diesel engine.
The symptom suddenly appeared in the middle of the savanna, and I couldn't even start the engine.
It's easy to fix when you get out of the car, but the lions are taking a nap right next to the car.
Even if you twist the key to start the engine, you can not preheat, so the starter motor just growls in vain.
So, I gently went out of the car and repaired the preheat so that the lions who fell asleep would not be noticed, and somehow repaired it.
I started the engine safely and got nothing.
There are many other things, but when the night is approaching or when it rains in the muddy water, there is nothing so lonely that the engine cannot be started.
If you're in town, you can get things pushed by passers-by, but not in Bush.
Suddenly the story went awry,
This time, it was thought that there was something else that caused the starter motor to slow down.
It seems that parts replacement is also necessary for this repair, so I decided not to disassemble it myself, but to have a mechanic specializing in local electrical systems who took care of me straight before.
I used to have the wiper repaired there when it slowed down.
This wiper had lost power due to coil settling over many years of use.
At that time, I found a used assembly with a matching coil and replaced it, and the wiper moved more powerfully than when I purchased it.
So I removed the starter motor from the car.
Land Cruiser starter motor set
When I removed the cover of the starter motor, it became clear immediately what caused the slow movement.
The brush isn't worn, but it's pitch black, which is the cause!
The cause was not the coil but the oxidation of the brush.
As you can see in the picture above, the two brushes in the back are black.
The two brushes in the foreground have been replaced once a few years ago, and the two brushes in the back have never been replaced since 17 years ago when I started riding.
Last time, I replaced only two brushes to reduce the cost of repairs, and I should have replaced all of them at that time (saving only about 700 yen).
At that time, I had no idea that the copper brush material would oxidize and deteriorate.
Failures can be more wisdom than easy successes.
Without this case, there would have been no way to know that the copper of the starter motor would oxidize and make it difficult for current to flow. Somehow ...
The difference is obvious when compared with the new brush
It is probable that this brush part, when the engine was started, where a large current flows each time it was energized, was exposed to a large current for many years and deteriorated.
In the photo above, the new brush to be replaced on the right, and the beautiful bronze medal-like color, the worn-out brush on the left is black. Even if it was scraped, the core was black.
According to the investigation, it is said that once oxidation and deterioration start, the oxidation progresses rapidly due to the nature of copper.
Oxidation makes it difficult for current to flow, which causes problems like this one.
The fact that the power of the starter motor has begun to weaken rapidly recently is probably a sign of the rapid oxidation of copper in the brush.
After about 30 years, it seems that such deterioration of a part of the wiring system and metal parts will appear.
So, I decided to reassemble all the parts and attach the starter motor to the car.
During the starter motor installation work,
I found that the positive (+) main cable that connects to the starter motor, the part that hits the base of the motor, hangnailed and about half of the copper wire was cut off.
If this is left as it is, a large amount of current loss and resistance will occur.
I forgot to take the picture.
The terminal at the tip of the copper wire was replaced with a new one and soldered firmly.
A cable that allows a large current to flow at once to start a large engine with only 12 volts, and at the start, a tremendous amount of current flows at once.
In order to make it easier for the large current to flow, the thickest cable in the car is used, and it is connected directly to the starter motor directly from the battery.
At the same time, it was a big harvest to be able to confirm that such an important cable was damaged.
After repairing the cables, I put the starter motor back in place and all the cables back.
Ready to start the engine!
Well, after doing enough preheating, I twisted the key.
Then, the starter motor rotates at an amazing detonation velocity that I have never heard before.
The rotating sound seems to be about an octave higher than before.
"Wow!" The joy comes.
But
"That ...? The engine doesn't start." No matter how many times I try ...
Checkpoint at such time
Is the fuel properly reaching the injector pump?・ ・ ・ When the fuel pumping on the upper part of the fuel filter is performed, the fuel is sufficiently filled in the pipe, so the fuel has reached the injector pump firmly.
Is the preheat properly energized?・ ・ ・ When the preheat is turned on, the lights on the dashboard become slightly dark, and it seems that the power is on properly. However, the rate of darkening is small, and although there may be some problems, the engine should be able to start sufficiently.
Is one positive cable connected to the injector pump broken? "Hi! The wire is broken!" If this is broken, the engine will never start.
So it was caused by the disconnection of the injector cable of 3.
It probably came off when the starter motor was removed or reattached.
This often happens when you ask for a car repair in this country.
I'm glad I just disconnected the cable this time.
Once you've connected the cables and you're ready to go.
Twist the key again,
The engine started in an instant, as if I was surprised at how energetic the starter motor was.
As soon as I thought I did, I stopped.
Engine-kun, who hasn't been turned around with such momentum recently, seems to be suspicious that the starter motor is doing something bad.
It feels like it's stopped because it's being turned much faster than the idle speed, or because it's running out of fuel for a moment.
In order to improve fuel efficiency and engine braking effectiveness, I have narrowed down the idle speed quite a bit, so I stepped on the accelerator a little and twisted the key again.
This time, the engine was comfortable and started like a new car.
The preheat line, maybe not enough current, let's check the preheat system this time.
This is also a line through which a fairly large current flows, and maybe the wiring copper is also oxidized, making it difficult for the current to flow.
I'm looking forward to opening the lid from now on.
So I can't stop old cars.
Now, how do you make excuses for his wife to start working?
This time the end
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I tried to summarize the changes before and after this starter motor repair and the state of the repair in the video.
If you are interested, please click the video below.
Until the end Thank you for reading.
