YM226D Project

[California]

re getting the injectors out, you can do it the pro way, get the Hoye tool.

Or you can do it cheap. This worked but it was more hassle than I expected. The injectors were an extremely hard pull all the way out.

I liked Aaron's (Hoye) comment, they destroyed some uncooperative injectors until they perfected the ideal tool.

My longwinded post:

Injector removal tool - (cheapskate version) - with photos

 

[tc197]

Thanks for the info guys, went ahead and sprung for the puller from Hoye. Slow moving project but hopefully it's worth it in the long run.

 

[rScotty]

SNIP

2. Despite all of the posts about Yammer-Hammering I think I have extra noise and it does not sound smooth to me, especially at lower RPM's. I hear inconsistent knocking and not just a smooth diesel rumble like my fathers BX series Kubota.

SNIP

The "Yammer Hammer" hasn't been my experience with older Yanmars - particularly the USA models from the 1970s and 80s - which would include the YM226D.

I think that the nickname may have originated with some of the air-cooled single cylinder marine diesels. Especially those single cylinder "long-tails" that ran so many river boat sampans in SE Asia.
As far as tractors go, our two cylinder YM165D was pretty smooth except at very low idle - and even then it didn't hammer. The three cylinder models like your YM226 were all exceptionally smooth and quiet. Smooth running is the mark of well designed three cylinder engine anyway. They were always known for that. People used to remark on how quiet & smooth the 3's ran when I was at the Yanmar dealer.

As far as I know, there doesn't have to be any reason for diesels to hammer. Our big JD is smooth running after 6000 hrs. It runs so quiet you can hear the turbo spin up when you gun it. I also like our 4 cylinder Kubota - it it more lightly constructed than the JD & with a side exhaust, so maybe that is why it makes a little more motor & fan noise than the JD - but is still what anyone would call a nice running 60hp motor at 1000 hrs.
But neither one has the smoothness of our old 33hp Yanmar. Yours can be that smooth too.
rScotty

 

[California]

The "Yammer Hammer" hasn't been my experience with older Yanmars - particularly the USA models from the 1970s and 80s - which would include the YM226D.
rScotty

My two-cylinder YM240 must be the exception. Sometimes I wonder if the injection timing is a little early, like preignition in a car. The best way I can describe it is, imagine several people pounding on a heavy manhole cover with sledges. Deep bone-shaking thuds. Muzzling the muffler with a gloved hand makes no difference at all. Cetane improver helps only a little. 18 years now and no change, so it's not a rod knock.

For me the Hammer is real. Its the reason I prefer to use the (smooth) YM186D most of the time and leave the YM240 dedicated to backhoe use. After it has warmed up, that light use is merely loud but it isn't loaded down to where it smokes or clanks.

It's tiring, even with hearing protection on - either muff or earplug style. And causes temporary hearing loss if unprotected.

The only time I've heard another of these run was a YM2000 at a VN import house. That one did seem smoother.

I have a recording of this racket on a personal website. PM me if you want a link. (I don't want the traffic this might generate if I name it here).

 

[bmaverick]

The "Yammer Hammer" hasn't been my experience with older Yanmars - particularly the USA models from the 1970s and 80s - which would include the YM226D.

As far as I know, there doesn't have to be any reason for diesels to hammer. Our big JD is smooth running after 6000 hrs. It runs so quiet you can hear the turbo spin up when you gun it. I also like our 4 cylinder Kubota - it it more lightly constructed than the JD & with a side exhaust, so maybe that is why it makes a little more motor & fan noise than the JD - but is still what anyone would call a nice running 60hp motor at 1000 hrs.
But neither one has the smoothness of our old 33hp Yanmar. Yours can be that smooth too.
rScotty

The Yanmar made JD650 vs. the JD850, HUGE difference. One notices right away the hammering. I call it the popcorn engines. As for diesels, it's common for the 2-clys to do this. My neighbor has a Ford 1500 that pops too.

 

[tc197]

It’s been a bit since I’ve updated, got stuck with a combination of bad weather and lack of time for a few weeks.

The injector puller came in and I was able to remove and clean all 3 injectors. The injector furthest forward on the tractor had some rust and debris built up, the other two were pretty clean.

I replaced the soft fuel lines and bled the air out. I also discovered my fuel cap was jammed up and did not have a good vent. I attempted a fix that I believe will work, but I will also test with the cap loose going forward for now.

After replacing the lines and cleaning the injectors the tractor is still very hard to start. I did get it going this weekend but it required the block heater despite being mid 50’s out. It also takes several iterations of using the thermostart and cranking. Once running It did sound better than before but I had a few noticeable issues:

1. White smoke.
2. The rpms still surge. I could manage an idle around 800rpm but any movement of the throttle and it would ramp up to 2-3krpm. It was much smoother sounding and not knocking.
3. At idle any load on the tractor would stall it. This model has power steering and even slight pressure on the steering wheel would bog it down and stall it if I continued applying pressure. This may be normal, i’m not sure.

I was able to grab a video of it running, smoking, and ramping up. If I can find a way to post it I will.

 

[bmaverick]

It’s been a bit since I’ve updated, got stuck with a combination of bad weather and lack of time for a few weeks.

The injector puller came in and I was able to remove and clean all 3 injectors. The injector furthest forward on the tractor had some rust and debris built up, the other two were pretty clean.

I replaced the soft fuel lines and bled the air out. I also discovered my fuel cap was jammed up and did not have a good vent. I attempted a fix that I believe will work, but I will also test with the cap loose going forward for now.

After replacing the lines and cleaning the injectors the tractor is still very hard to start. I did get it going this weekend but it required the block heater despite being mid 50’s out. It also takes several iterations of using the thermostart and cranking. Once running It did sound better than before but I had a few noticeable issues:

1. White smoke.
2. The rpms still surge. I could manage an idle around 800rpm but any movement of the throttle and it would ramp up to 2-3krpm. It was much smoother sounding and not knocking.
3. At idle any load on the tractor would stall it. This model has power steering and even slight pressure on the steering wheel would bog it down and stall it if I continued applying pressure. This may be normal, i’m not sure.

I was able to grab a video of it running, smoking, and ramping up. If I can find a way to post it I will.

1. inspect the engine governor rod and timing apparatus. My old JD850 had a bend one due to an inexperienced diesel mechanic.
The engine would run at idle, bump the throttle, and wham-o 3K rpms. There was no in-between.

2. Verify the inject lines are going to the RIGHT injectors. This was problem #2 from the same mechanic.

3. Inspect and compare all the throttle linkages, springs and mechanisms to diagrams and other WORKING YM226 machines.
You may have to poke around the web for an image search.

Now the white smoke.

1. Normally with a diesel, white smoke out the exhaust strongly suggests the injectors are very worn out. This too could be the reason WHY the idle can JUMP to 3K. The injectors just get a hint of extra fuel to go WIDE OPEN. Then adding a load it sputters to die out.

With all the work you have done, don't run the engine long with it white smoking.

 

[tc197]

1. inspect the engine governor rod and timing apparatus. My old JD850 had a bend one due to an inexperienced diesel mechanic.
The engine would run at idle, bump the throttle, and wham-o 3K rpms. There was no in-between.

2. Verify the inject lines are going to the RIGHT injectors. This was problem #2 from the same mechanic.

3. Inspect and compare all the throttle linkages, springs and mechanisms to diagrams and other WORKING YM226 machines.
You may have to poke around the web for an image search.

Now the white smoke.

1. Normally with a diesel, white smoke out the exhaust strongly suggests the injectors are very worn out. This too could be the reason WHY the idle can JUMP to 3K. The injectors just get a hint of extra fuel to go WIDE OPEN. Then adding a load it sputters to die out.

With all the work you have done, don't run the engine long with it white smoking.

Thanks bmaverick, I'll go check out the governor rod. LeeJohn hinted at this as well. I'll also confirm the injector lines aren't mixed up, I'd be surprised because they are hard lines and wouldn't easily be crossed but you never know.

I've been doing some research on the white smoke and considered just replacing the injectors. Rather than throw money at the problem I figured I could do a little more diagnosing first so I have a compression gage on the way and I'm planning on pulling the injectors again to verify the spray patterns on some cardboard. If I come up with poor compression I'll know the problem starts deeper and the injectors may be ok. If I get good compression and/or poor spray patterns I'll be back to looking at the injectors and may just replace them. The governor assembly gives me something to check out in the mean time.

 

[runningbird]

My understanding is the Yanmar hammer is in reference to the 2 cylinder motors.
if you have not, I would add injector cleaner and just let the tractor idle at 2000rpm for an hour. I did this with many tractors when I was importing and had good results.

 

[CoyPatton]

Also today’s fuels are very different from the fuels of the late 70’s and early 80’s of the design of our YM machines. Frequent additive to your fuel of a good quality diesel additive is probably wise.
I try not to call at brand names as there are many high quality brands.