OP
gioacchino
Bronze Member
Just to clarify. The fitting is located on the left side/driver side of the tractor (if you are sitting on the seat facing forward).
Last edited:
New Owner of a YM165
- Thread starter gioacchino
- Start date
- Views: 33929
rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 9,550
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
I have never figured out the differences between the YM155 and the YM165 except the model name. When Yanmar transitioned from the lime green gear transmission machines of the 1970s to the candy red power shift machines of the 1980s, the green YM155 series became the red YM165 series. I remember talking about it the year that happened and we could not find any difference in the parts. The YM165 series did have the new camshaft to replace the ones that had given trouble to early YM155s, but that was old news with the change being made during later YM155 production, and directly replaceable anyway. There was also some speculation that the YM165 was the recipient of upgraded injector nozzles, and that might be where the extra horse came from. Or maybe it was just an advertising horsepower.
I do not know of a single difference between the YM155 and YM165 that I can point to other than the color. Yanmar continued to upgrade replacement parts, but they made a point of making them retrofit to both models.
enjoy, rScotty
I confirm.
normde2001
Elite Member
- Joined
- Mar 10, 2002
- Messages
- 4,163
Yes, that is the sending switch which you have to replace.
rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 9,550
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
Yes, that is the right place to put any temperature sender. Here are some photos of mine.
IMPORTANT: Please pardon me for beating on this point, but like all tapered pipe threads in all vintage Yanmars, this fitting is BSPT thread (British Standard Pipe Tapered). Yanmar did not use the the common US tapered pipe thread (NPT). It isn't NPT even though it seems to be.
If you try to screw a standard NPT pipe threaded fitting into the cast Yanmar block it will screw in OK because the number of threads/inch is the same in both standards. But the pitch of the threads is different, and you will just end up ruining the threads in the block and it will always leak. That goes for where the block heater screws in as well. It is true on all the vintage Yanmars and a lot of other Japanese machinery from that era - especially cars.
You can buy a simple part to adapt from British taper to US taper adapter at most hardware shops and especially anywhere that services vintage Japanese sports cars. You can see the part in the photo below.
How the Japanese (and several other metric countries) came to use a British tapered pipe thread has got to be a good story, but I think we've posted it here before. I know we did on the Yahoo tractor site that preceeded TBN.
When I re-do the gauges on my own YM165D, I am going to put in a high resolution temperature gauge. None of the 2" stuff you see in the photo. The YM165 thermosiphon cooling system is very sensitive to slight changes in radiator efficiency and slopes.
rScotty
Attachments
OP
gioacchino
Bronze Member
Thank you for all the great information! And thanks to the others for their responses. This is the gauge I purchased. I couldn’t find any information on the adapters that come with it, so we shall see.
Amazon.com: Bosch SP F 53 Style Line 2" Mechanical Water/Oil Temperature Gauge (Black Dial Face, Black Bezel): Automotive
Says it comes with 1/4 and 1/2" npt. Style Line 2" Mechanical Water/Oil Temperature Gauge (Black Face) - FST 8217 | Bosch Performance
OP
gioacchino
Bronze Member
Nice find! Looks like I’ll be making a trip to the auto parts store. 1/2” BSPT fitting, correct?
No, M16-1.5. One source METRIC TEMPERATURE GAUGE ADAPTER: Yanmar Tractor Parts
I am not sure what the npt size of Hoye's adapter is, may be 1/8npt
I am not sure what the npt size of Hoye's adapter is, may be 1/8npt
Last edited:
OP
gioacchino
Bronze Member
What is a normal operating temperature for a YM165? I finally got the new radiator installed, as well as new hoses and a temperature gauge. While letting the tractor run and checking for leaks and what not, the temperature gauge read 235. That seems pretty high. I put in a roughly 70% water, 30% coolant mixture. I am letting the tractor cool off now and will go back later to verify that the coolant is at the correct fill level now that it has circulated.
Thanks.
Thanks.
