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427 PSI would not be that bad! Problem is you can find al lot of measurements on the internet of bad values, you never see information about measurements when repaired :) Today I also took the starter apart, cleaned it (it was a mess) and gave it new grease. So the leak and compression test...

Did some tests tonight. First checked the injection timing, it is spot on 21 degree before TDC. I did a new leaktests tonight in cold condition. Got the valvecover removed. All 3 cylinder have a leak of 10%-15% at TDC, the leak is blowby and hearable from the carter at the wide ports where the...

Pipe is 6mm inside diameter over length of 150mm Adapter is 9 mm inside diameter over length 10mm

I keep the valve spring tester in mind, thank you. The pressure gauge has an adapter screwed to a pipe (at the green section), I think together it is like 15cm before the valve (at the red section). I don't have photos of the valves/seats.

Compared to my Deutz engine I find the Yanmar valve springs easier to press, but that doesn't tell you anything. During leaktest there's 10% which is hearable at the carter vent. Before the valve lapping I could hear air leak out on the intake and exhaust ports. Leak test is of course at...

That is true for this engine. 426 PSI is the lower limit in the manual. There's 3 considerations: -Manual does not tell you if this is in cold or hot condition. -The tools for pressure measurement enlarges the volume of the combustion chamber a bit, not shure how much this affects it -I have no...

Forgot to mention, valve clearance is set to 0.2 mm as dictated in the manual and is shown on a sticker on the engine.

As long as I know it is a bad starter and it is getting worse every year. The tractor is used daily but short time and has no heavy load, only transport. Thats a good recipe for carbon buildup ;) At the moment Im not sure if the bad start and smoke are two different problems or just the same...

An update: Injectors -Cleaned the injectors -Opening pressure > OK -Not leaking just below opening pressure > OK -Spray pattern > OK Head Took the head of; lots of carbon on the valves and valve seats -Cleaned head and valves -Lapped the valves as best as possible (lots of pitting). -Checked...

Hello, we have a bad starting YM186D (3t72HA). Done a COLD compression test cilinders reach, cil 1: 280PSI , cil 2: 285PSI , cil 3: 300 PSI. First stroke about 100PSI Second stroke about 150 PSI Third stroke about 200 PSI Then it takes another 4-5 strokes to 280-300 PSI Then Cold wet...

Hello! Today I received this picture from the girls driving the Yanmar 186D : Not good for 2 reasons: Oil leak and also, that is not the right color for oil at all! So... A couple days ago I was told the 4WD axle went loose and fell of: Because of Covid quarantaine I wasn't able to fix...

Only used a .20 and .25 spacer so didn't measure the exact space on the valves, so hard to tell, guess more than twice, but of course not sure. I suspect the loose injector causing compression leaks when cold. I was aware of the injury risk, so I tested the injectors using a cardboard and off...

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...

OK will check the forum. Just opened the alternator, only coil, no electronics, 2 terminals. This one:

I found the schematics for a 220 in the internet, I guess this is the most close to the wiring on the tractor. Is this correct? : The temp sensor is NO (normally open) and the lamp gets tested during cranking as a result of the relay which is activated as it is connected to the switch which...

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: This one is last summer: I do have the...

I checked the startmotor it says JS729 which is like original specs. Also removed the regulator for the powershift and installed a new gasket. After replacement started the tractor and still no movement in reverse gear. Then after a while tried again and it worked like it should, so hope the...

Last week I got the new shaft for the pump: From this: To this: I rebuild the tractor, put a new hydraulics filter on it and added new oil in the transmission/hydraulics reservoir. At first the tractor seemed to work 100%, but after a while the powershift give some issues, it wont...

Sadly not possible because the splines on the output side of de PS pump 1510 don't match on the input side of the 186d gearbox..... So de idea is to have a custom shaft for the pump: The green side needs 1510 splines, the red side needs 186D splines

Im working on 2 scenarios: 1:) replace the main shaft, splined coupler and PS pump shaft, but hard to find this parts. I asked hoyetractor, not shure if they ship to The Netherlands. 2:) I got a clutch disc, main shaft, splined coupler, PS pump from an 1510, almost identical but sadly...

Finally I made it: Ive got another pump from a 1510D, sadly the splines on the backside don't match :( So have to spend some more time on finding spare parts....

I got some spare parts from a 1510, which was only few minutes away :) Shaft and coupler seem to fit, now i have to get to de PS pump. Now Im stuck removing the middle part from the tractor. Removed all bolts and nuts, but it looks like the shaft for the 4WD lever needs to be removed as well...

The tractor has an overrun clutch for shure, you can hear it when turning the pto to opposite direction by hand. We don't use the PTO so I don't think it causes the problems. I drained the hydraulics/gearbox oil, about 15 liters came out, very bad condition so it needs to be replaced. The...

Talking about this one right?

We own this tract for about a year now, and I also suspect it had a hard life, I think it needs more love! Theres several people driving this tractor, I think some detailed instructions are needed there. The first time the shaft broke was really soon after we got the tractor and Im not shure...

Tomorrow I will break down the tractor further and want to find out how de powershift and gearbox is doing. I think its imaginable that the shaft wasn't 100% straight after the welding, but we will never know ;) The brass looks very fresh and shiny to me, so maybe it was created just after de...

Hello, Our YM186D has some issues, the most important: the shaft between the clutch and the gearbox is broken. It has happened before, a mechanic has welded it previous time, now it is broken again. Im really surprised how in the world its possible to break such shaft. Does anyone have an idea...

Hello! Im from the netherlands and we own a YM186D tractor. Already found a lot of info and help on this forum, many many thanks! Currently working on some issues and I expect I need some help from you out there. Regards, AJ