Forum for air cooled diesel engines and clones

[90cummins]

Wow! That's an amazing little engine. Thanks for sharing it. How did you find it? Do you have any insights on how the flow is partitioned between filter and the bearings?

All the best,

Peter

I read a brochure on it several years ago and when I happened to see it on eBay I bought it immediately.
Very nice engine for a prepper.
I have not seen one since.
It is a bypass filter setup diverting excess oil thru filter providing the oil pressure is above the bypass pressure setting.
That is all I know about the filter setup.


90cummins

 

[goeduck]

I have a standard L60 that is a great engine, but your L70 is really nice.

 

[90cummins]

I have a standard L60 that is a great engine, but your L70 is really nice.

Thanks

90cummins

 

[ponytug]

I have a 186FA driven generator that started fading for lack of a better description. It has only 50hours on the engine.

It starts fine, hits 3600rpm, and then as it warms up, slowly the governor advances until the fuel lever is pinned against the excess fuel pin. Then the rpms start dropping. (2800rpm+/-) At the same time, there is an odor of unburned diesel in the air. The air filter seems clean, and cracking it doesn't change the speed. The valve clearances are on specification. The fuel tank is clean, ditto fuel filter, and the diesel runs fine in my tractor.

I recently had to replace the fuel pump due to a bad solenoid, and the soft hoses due to age (cracking/weeping).

I am thinking that I now have a partially clogged injector? (I am assuming that despite my efforts, some dirt got in somewhere.) Does this sound right? Replace? Attempt to clean? (If so, how?)

Advice, suggestions most welcome.

All the best,

Peter

 

[90cummins]

I have a 186FA driven generator that started fading for lack of a better description. It has only 50hours on the engine.

It starts fine, hits 3600rpm, and then as it warms up, slowly the governor advances until the fuel lever is pinned against the excess fuel pin. Then the rpms start dropping. (2800rpm+/-) At the same time, there is an odor of unburned diesel in the air. The air filter seems clean, and cracking it doesn't change the speed. The valve clearances are on specification. The fuel tank is clean, ditto fuel filter, and the diesel runs fine in my tractor.

I recently had to replace the fuel pump due to a bad solenoid, and the soft hoses due to age (cracking/weeping).

I am thinking that I now have a partially clogged injector? (I am assuming that despite my efforts, some dirt got in somewhere.) Does this sound right? Replace? Attempt to clean? (If so, how?)

Advice, suggestions most welcome.

All the best,

Peter

Is this a new problem since you replaced the injection pump?
If not I would check or replace the injector first.
They are easy to disassemble. These are very precise parts when removing or inserting the plunger be gentle, it can get stuck if misaligned.
They are cheap and easy enough to replace.
Do not touch the precise surfaces with your hand moisture can corrode the surfaces.
Use only diesel fuel to re-assemble.

90cummins

 

[ponytug]

Thanks for the advice!
The engine ran fine for about eight hours after replacing the fuel pump. So, yes, a new problem, but not a "replaced the fuel pump and the trouble started" problem.
I will try to pull the injector today or tomorrow. If I have debris inside, I guess I am hoping it will be easy to rinse/blow out. I ordered a new injector, just in case. Thanks for the tip on not touching it with bare hands.

Do you have a trick for priming these? I have been pulling a vacuum on the return fuel line beyond the injector with a compressed air venturi.

All the best,

Peter

 

[90cummins]

Thanks for the advice!
The engine ran fine for about eight hours after replacing the fuel pump. So, yes, a new problem, but not a "replaced the fuel pump and the trouble started" problem.
I will try to pull the injector today or tomorrow. If I have debris inside, I guess I am hoping it will be easy to rinse/blow out. I ordered a new injector, just in case. Thanks for the tip on not touching it with bare hands.

Do you have a trick for priming these? I have been pulling a vacuum on the return fuel line beyond the injector with a compressed air venturi.

All the best,

Peter

I would check flow to the injection pump and if necessary disassemble the injection pump also.
Could also be a clogged fuel filter in the tank.

To prime the system ensure fuel is on, move the throttle to maximum loosen the nut at the injector a 1/2 turn or so and crank the engine until fuel squirts out from nut.
Tighten nut and engine should start right up.

90cummins

 

[bmaverick]

This is a really neat thread in the Yanmar forum.

Recently I came across a manual for Yanmar air-cooled diesel engines.

YANMAR AIR-COOLED DIESELS L50 L60 L90 PARTS MANUALS NPC-2706.PDF

See the attached. Hope it helps.

 

[goeduck]

This is a really neat thread in the Yanmar forum.

Recently I came across a manual for Yanmar air-cooled diesel engines.

YANMAR AIR-COOLED DIESELS L50 L60 L90 PARTS MANUALS NPC-2706.PDF

See the attached. Hope it helps.

All Greek to me

 

[bmaverick]

All Greek to me

Actually all Japanese. :laughing:

A person can take a page of the PDF, save it as an image, upload to this site to read in ENGLISH. Translate an image

That's what we've been doing with the Yanmar tractor manuals now. :thumbsup:

We now have a Rosetta Stone.

 

[ponytug]

Are all the copper injector washers 1.4mm thick, or does it vary by individual injectors? (Or is it 1.3mm?) I have read conflicting statements.
(I mangled a washer installing it today, and I'm looking to salvage the injector.)

Anyone know the torque on the m10 nuts holding the injector in?

Thanks!

All the best,

Peter

 

[90cummins]

Trying to attract the complete workshop manual not having much luck.

90cummins

 

[bmaverick]

View attachment 679452

Trying to attract the complete workshop manual not having much luck.

90cummins

A computer is the best way. Smarty phones do weird things.

In this thread, click on the "GO ADVANCED". Then you can hit the "Manage Attachments" below the SUBMIT button.

:2cents:

 

[ponytug]

Awesome! I feel like some of the steel on these nuts and studs is a little on the soft side, so it is great to have numbers.

All the best,

Peter

 

[90cummins]

Here is the link for the Yanmar L series shop manual.
If this does not work you can find it at Greenmountaingenerators.com


https://cdn.greenmountaingenerators...E-L70AE-L75AE-L90AE-L100AE-Service-Manual.pdf

90cummins

 

[bmaverick]

Here is the link for the Yanmar L series shop manual.
If this does not work you can find it at Greenmountaingenerators.com


https://cdn.greenmountaingenerators...E-L70AE-L75AE-L90AE-L100AE-Service-Manual.pdf

90cummins

So, what you are hinting at is this, Yanmar engines with the prefix "L" are the air cooled types?

 

[ponytug]

I have a 186FA on a 5000W/6500W surge generator that I am having speed control issues with. I put in a new injector, having previously replaced the fuel pump. (Old fuel pump leaked around the fuel intake.) I put on a new air filter as well, and I changed the oil while I was at it (filter was spotless).

This morning, I ran a load test of 4500W for 45 minutes or so. Air temp 60F. Light smoke from the exhaust the whole time, getting slowly less as time went on. The exhaust smelled fully combusted, unlike the old injector when the exhaust smelled like diesel. The engine held speed under load, the governor functioned normally. On target voltage and frequency. I will say that engine exhaust got HOT. The muffler turned from black to a grey and the little label on the frame over the muffler warning of the hot exhaust slowly got baked black. Then again, I have never really pushed the generator before. The generator has forty eight hours of use, mostly light duty backing up the house during power outages, where the microwave and the 3/4HP booster pump are the biggest load it sees. So, yes, probably lightly loaded for much of the forty odd hours.

The problem: after I took the load off and was letting the engine run to cool down, I heard the speed drop, and noticed that the governor was pinned against the high fuel limiter. I added back load and the engine came back up to speed, and the governor came off of the limit pin. I then cut the load again, and the speed dropped. Just for grins, I tried adjusting the speed downward a few hundred rpms, which brought the governor off the limit pin for a minute or so, and then it was pinned again.

I am stumped. Any ideas?

All the best,

Peter

 

[bmaverick]

I have a 186FA on a 5000W/6500W surge generator that I am having speed control issues with. I put in a new injector, having previously replaced the fuel pump. (Old fuel pump leaked around the fuel intake.) I put on a new air filter as well, and I changed the oil while I was at it (filter was spotless).

This morning, I ran a load test of 4500W for 45 minutes or so. Air temp 60F. Light smoke from the exhaust the whole time, getting slowly less as time went on. The exhaust smelled fully combusted, unlike the old injector when the exhaust smelled like diesel. The engine held speed under load, the governor functioned normally. On target voltage and frequency. I will say that engine exhaust got HOT. The muffler turned from black to a grey and the little label on the frame over the muffler warning of the hot exhaust slowly got baked black. Then again, I have never really pushed the generator before. The generator has forty eight hours of use, mostly light duty backing up the house during power outages, where the microwave and the 3/4HP booster pump are the biggest load it sees. So, yes, probably lightly loaded for much of the forty odd hours.

The problem: after I took the load off and was letting the engine run to cool down, I heard the speed drop, and noticed that the governor was pinned against the high fuel limiter. I added back load and the engine came back up to speed, the governor came off of the limit pin. I then cut the load again, and the speed dropped. Just for grins, I tried adjusting the speed downward a few hundred rpms, which brought the governor off the limit pin for a minute or so, and then pinned.

I am stumped. Any ideas?

All the best,

Peter

Not a clue really. I did find a PDF manual for it. Maybe it could help?
http://dieselgeneratorsonline.net/Documents/ETQ170F178F186FPartsList.pdf

 

[ponytug]

Not a clue really. I did find a PDF manual for it. Maybe it could help?
http://dieselgeneratorsonline.net/Documents/ETQ170F178F186FPartsList.pdf

Thanks for the manual; I find each version of the 186 manuals have another tidbit in it that is new to me.

The part that has me stumped is why a light load should cause the governor to ask for more fuel, instead of less fuel. I am open to the thought that the new fuel pump that I installed is defective in some way.

I have bought my replacement parts off of Amazon and eBay; anyone have a favorite vendor for reliable parts?

All the best,

Peter

 

[90cummins]

Very odd!!
No idea what is going on here.
I will have to think about that.

90cummins