Yanmar 186D broken shaft

[bmaverick]

The tractor is repainted and I have no idea which parts are original or maybe put together form other tractors.
On the inside of the dashboard there's still the lime green color.

Here are some pic's:

Just enough rebuild for a test drive earlier:
View attachment 680445


This one is last summer:
View attachment 680446


I do have the parts manual which is available on internet.
In the meantime also got a service manual, but it is incomplete.
Doesn't cover the electrical parts and some other sections.

Your Yanmar is not an early green. It's painted JD green. So, with that said, you actually own a YanDeere YD186D :laughing:

 

[bmaverick]

Look what I found on youtub:

1976??

1976 Yanmar YM186 D .9 Litre 3-Cyl diesel 4WD Tractor (18 HP) - YouTube

That machine is gorgeous ! It's like in mint condition. A Yanmar lime green YM186D in it's splendid colors. Nice find!

 

[California]

Look what I found on youtub:

1976??

1976 Yanmar YM186 D .9 Litre 3-Cyl diesel 4WD Tractor (18 HP) - YouTube

Wow! Maybe the early ones built for Britain were green. There are many Brit-only parts in the Parts manual.

 

[ajaukema]

Your Yanmar is not an early green. It's painted JD green. So, with that said, you actually own a YanDeere YD186D :laughing:

A John Deere having red rims haha

The green is by far not like JD, the chassis is black, JD chassis supposed to be green as well.

I think our tractor is more like a Yameleon :laughing:

 

[bmaverick]

A John Deere having red rims haha

The green is by far not like JD, the chassis is black, JD chassis supposed to be green as well.

I think our tractor is more like a Yameleon :laughing:

Back around 2006 or so, on this forum, a person coined the term YanDeere.

https://www.tractorbynet.com/forums/john-deere-buying-pricing/100677-anyone-heard-yandeere.html
https://www.tractorbynet.com/forums/projects/77913-moving-20-container.html#post866159
The earliest post of the term on the web from what I could find.









A funny YanDeere The YanDeere by Dorami : geometrydash


On an anime site, YanGirl posted this:

 

[California]

Back around 2006 or so, on this forum, a person coined the term YanDeere.

How bout a YanBota?

My rear tires and rims are apparently Kubota dealer take-offs, larger than what should be on there. And the backhoe was sold as OEM by both Yanmar and Kubota. Mine is in Kubota colors. So the YM240 is part way to hybrid. See my sig pic, below.

 

[ajaukema]

Wahaa lots of fun! Not really the color combinations you would expect

Today I removed all the unnecessary wires, removed al the tape and other stuff.
Everything works except....
My ignition switch is different.
The fusebox is only powered in the ON position.

Based on the schematics I guess the fusebox should be powered in the ON, TS and Crank position.

Anybody here who knows?

Also put the alternator back and tested the AC voltage on it (running engine), sadly it is 0.0
Tested the resistance, almost 0, also beep.
So maybe shortage inside the coil?
Or does anyone have an other explanation?

I got the service manual for a ym276 free from internet, it is more complete compared to the one I have for the ym186 and there is a lot of common items.

EDIT:

Thermostart plug is connected on 2 terminals at the key switch, for what reason? High current?

 

[bmaverick]

Wahaa lots of fun! Not really the color combinations you would expect

I got the service manual for a ym276 free from internet, it is more complete compared to the one I have for the ym186 and there is a lot of common items.

EDIT:

Thermostart plug is connected on 2 terminals at the key switch, for what reason? High current?

That's the TS in the ignition key setting. Why 2 wires?

You only have a partial storybook with the YM276 book. It would have some similar general items, but not exactly explicit.

I can make mention that both California and myself along with many others have not been able to turn up a YM186 service manual.
We do have a recent addition from the Yanmar Tractor Owners Group on GIO. I'll add it here too. Just maybe, with these manuals, you could draw some conclusion how things should have been on the machine.

YANMAR YM135 YM155 YM240 YM330 ELECTRICAL MANUAL.pdf

Next to hydraulics, the electrical schematics tends to be the most sought after item to troubleshoot.

Over at Jensales, this is shown. Would this actually be the right electrical schematic in image-4 for a YM186? Not sure.
Yanmar YM186 Tractor Parts Manual
Even in my image enhancer, one can now make out most of the English.

 

[California]

both California and myself along with many others have not been able to turn up a YM186 service manual.

True. No downloadable pdf exists so far as I can find. Closest is the incomplete CD/download on Ebay that is just engine and driveline. But that one lacks electrics, hydraulics, and ???.

Here's an original authentic YM186 Service Manual on Ebay but its offered at $187!
Yanmar YM186 & YM186D Tractor Shop Service Repair Manual | eBay

I have the Hoye reprint of that one. I don't know if its still offered.

 

[winston1]

That's the TS in the ignition key setting. Why 2 wires?

You only have a partial storybook with the YM276 book. It would have some similar general items, but not exactly explicit.

I can make mention that both California and myself along with many others have not been able to turn up a YM186 service manual.
We do have a recent addition from the Yanmar Tractor Owners Group on GIO. I'll add it here too. Just maybe, with these manuals, you could draw some conclusion how things should have been on the machine.

YANMAR YM135 YM155 YM240 YM330 ELECTRICAL MANUAL.pdf

Next to hydraulics, the electrical schematics tends to be the most sought after item to troubleshoot.

Over at Jensales, this is shown. Would this actually be the right electrical schematic in image-4 for a YM186? Not sure.
Yanmar YM186 Tractor Parts Manual
Even in my image enhancer, one can now make out most of the English.
View attachment 680590

Pretty sure that is the same diagram I attached in post #60, yours may be plainer.

 

[bmaverick]

Pretty sure that is the same diagram I attached in post #60, yours may be plainer.

hmm. It didn't scale right either.

Let's try that again in PDF.

Rotate and zoom to 100%. It should be somewhat readable for many of the items.

 

[ajaukema]

Fixed all the wiring!

Added LED work lights!

I got a used dynamo, sadly it doesn't fit.
Based on the color I think it's a kubota.

But..

Somehow magical the old dynamo is working again!
Very very strange, but im happy

Starting the engine is still horrible.

I might take a look at the valve clearance but can I take this valve cover off and re-install it without needing a new gasket?

 

[winston1]

It is a rubber o-ring type gasket. Likely you can use it over, if it looks pretty flat you might use a little sealant.

 

[rScotty]

Somehow magical the old dynamo is working again!
Very very strange, but im happy

Starting the engine is still horrible.

I might take a look at the valve clearance but can I take this valve cover off and re-install it without needing a new gasket?

If something electrical suddenly starts working, it is more likely to be an erratic connection rather than a component.

The valve cover gasket doesn't hold any pressure. The cover just captures the oil being flung around by the rockers. It is common to re-use valve cover gaskets by gluing them into the recess of the pressed steel valve cover with some silicon gasket maker so that the cover and gasket become one unit. If all goes well, bolting it back on makes the bottom of the gasket conforms on the engine side well enough to keep oil from leaking. There is a slight rim that helps with that. This works best with a new gasket.

You have nothing to lose by looking at the valves & might save your engine. You can always do a temporary gasket repair with silicon....but LET THE SILICONE CURE before reinstalling. You do not want uncured silicon forming stringers & mixing with the engine oil where it can be transported into narrow passages to clog up the oil feed.
best,
rScotty

 

[ajaukema]

OK lets get the cover off.
I have some fluid gasket left which I used for the hydraulic cylinder case (just in case)

Because the engine runs fine if it runs and there is lots of white smoke when cranking while full throttle I suspect it is a compression issue (don't have tools to test is)
Let me start checking on the valves.

I'll bleed the fuel system just to be shure.

Maybe take the injectors out for inspection/cleaning if it isnt too hard to get em out.

 

[ajaukema]

Taking the engine head off and reinstall it requires a new gasket?

 

[CoyPatton]

Taking the engine head off and reinstall it requires a new gasket?

Yes it will.

If you remove the injectors, go ahead a get a compression tester.
I also like a leak down tester. Following poor compression test results. If you can identify when the air pressure is escaping, you learn a great deal regarding what is wrong in the engine.

 

[ajaukema]

Today checked the valves, two of them had way more space compared to 0.20 as specified, adjusted them.

Also got all the injectors out, very easy, so I guess Im mister lucky here

One of the bolts was already loose...hmm....not good

The hardest part was to move the second fuel line out of the injector since there is a little too less space if you want to leave the air intake manifold on.

They all look like this:



What do you guys think, dirty, very dirty or .....

Also checked the spray patterns, the way the diesel sprayed out, oh boy you cannot call that a pattern at all

Because the tractor is in use these days I put them back and will clean them later.

However the tractor started much better already, so I guess the loose injector made a compression leak.

Any tips on cleaning the injectors?

 

[rScotty]

Today checked the valves, two of them had way more space compared to 0.20 as specified, adjusted them.
SNIP SNIP
Any tips on cleaning the injectors?

How much more than 0.2mm? Generally, it can be twice that and still no problems with starting or low speed running. A little too much valve stem clearance just retards the injection timing a bit which tends to make them run a bit sooty.

The injectors don't look bad to me, but not sure what you can tell by looking. I've never rebuilt a set and always wanted to. I've heard there are kits available but would be very careful and maybe just use wood to scrape. The needle valve part has to be delicate. I wonder if marine Yanmar engines use the same injectors?

Only other hint is to be careful when doing a spray pattern. Several thousand PSI spray WILL penetrate skin, and can blind you. The infection that follows high pressure injection through the skin - even in the hands - has reportedly killed people.
luck,
rScotty

 

[bmaverick]

Today checked the valves, two of them had way more space compared to 0.20 as specified, adjusted them.

Also got all the injectors out, very easy, so I guess Im mister lucky here

One of the bolts was already loose...hmm....not good

The hardest part was to move the second fuel line out of the injector since there is a little too less space if you want to leave the air intake manifold on.

They all look like this:

View attachment 683396

What do you guys think, dirty, very dirty or .....

Also checked the spray patterns, the way the diesel sprayed out, oh boy you cannot call that a pattern at all

Because the tractor is in use these days I put them back and will clean them later.

However the tractor started much better already, so I guess the loose injector made a compression leak.

Any tips on cleaning the injectors?

With the metal parts, an ultrasonic parts cleaner and Seafoam is how I've done it for years. Seafoam works well on diesel and as a cleaner for the fuel system. I've let the parts sit in for 15~20 mins at a time. IF it still looked nasty, more time was needed. When doing this, ideally outside and fresh air is best. An open garage or on the front porch has worked for me. Just keep away from the pets.

From the YM186 Parts Manual on pg 33, it shows a nice exploded diagram view of how it goes together. Wish it mentioned the torque requirements to put it all back together.