Hello.
I'd like to preface this UOA with a little background information.
I bought this little Yanmar from a consignment yard a year ago. It showed 200 hours on the working meter, but it is only 3 digit so it could have theoretically rolled over. I lean toward it only having 200 hours by overall condition and the way it runs. The tractor starts easy, zero visible blow-by from the vent tube, burns no oil and has good power.
The tractor was originally rebuilt by Fredrick's Equipment in Hartselle, AL. It supposedly got new rings, pistons, liners and bearings along with some seals and paint. Fredrick's rebuilds hundreds of these little tractors for resale and seems to have a good rep on the web.
I changed the oil when I bought it, and then again after 50 hours. I then changed it a third time (this sample) with 75 hours on the oil. The Yanmar manual from 1978 for this tractor specifies a 100 hour OCI with filter change every 200. The oil was just starting to darken up with 75 hours on it. Before that it stays honey colored.
I had a couple of questions about this report. I am new to BITOG so I am trying to get a handle on everything. I grew up with the 3k mile OCI so this site has really opened my eyes.
1. Is there any way to get an idea of the total hours on the machine from the UOA? As I said I lean toward it having only 200 hours (325 now), but don't know for sure.
2. Is the Iron a concern? I ask because of the Blackstone comments. My Iron was at 9ppm, but the Univ Avg Iron was at 8ppm with 425hrs on the oil. That sure seems like a long OCI for 2 cylinder Yanmars. Some of the other Yanmar UOAs (tractors) I've seen show 10-15ppm of Iron with around 100hrs on the oil. Granted, those were 3 cylinder engines and not 2 cylinder. The longest factory OCI recommendation I've seen for the John Deeres with Yanmars is 200 hours.
Thanks a lot for any thoughts or insights. This tractor is very useful to me and I hope to keep it for a long time. I plan to go with the Blackstone recommendation and run 125hrs on the next OCI.
Blackstone Report-
MAKE/MODEL: Yanmar 2-cyl
FUEL TYPE: Diesel
ADDITIONAL INFO: 1978, Engine rebuilt in 2006 (Rings/Pistons/Liners/Bearings)
OIL TYPE & GRADE: Shell Rotella T 15W/40
OIL USE INTERVAL: 75 Hours
Comments: Thanks for the notes. We haven't specifically tested the 2TR20A engine, but we've seen a fair
amount of 2 cylinder Yanmar engines, so those averages were used for comparison. Those averages are
based off about 425 hours on the oil. Your run was shorter, so it might've been nice to see iron reading
lower (since it tracks with time on the oil). On the other hand, iron at 9 ppm isn't an excessive amount of
metal either. The TBN is robust, showing lots of active additive left in the oil. Go ahead and run up to 125
hours before checking back. Nice report.
The Universal Averages are the 2nd number.
Alum 3 3
Chrom 2 0
Iron 9________8
Copp 2 1
Lead 0 1
Tin 0 1
Moly 0 79
Nick 0 0
Mang 0 0
Silv 0 0
Titan 0 0
Potas 8 1
Boron 92 284
Silic 8________6
Sodiu 4 7
Calc 2078 1750
Magn 10 321
Phos 957 1073
Zinc 1134 1297
Bariu 0 0
Value should be
SUS Visc @ 210 F 74.2 69-80
cSt Visc @ 100 C 14.04 12.7-15.8
Flashpoint in F 430 >410
Fuel % Antifreeze % 0 0
Water % 0 0
Insolubles % 0.1 TBN 8.5 >1.0
TAN Not done
I'd like to preface this UOA with a little background information.
I bought this little Yanmar from a consignment yard a year ago. It showed 200 hours on the working meter, but it is only 3 digit so it could have theoretically rolled over. I lean toward it only having 200 hours by overall condition and the way it runs. The tractor starts easy, zero visible blow-by from the vent tube, burns no oil and has good power.
The tractor was originally rebuilt by Fredrick's Equipment in Hartselle, AL. It supposedly got new rings, pistons, liners and bearings along with some seals and paint. Fredrick's rebuilds hundreds of these little tractors for resale and seems to have a good rep on the web.
I changed the oil when I bought it, and then again after 50 hours. I then changed it a third time (this sample) with 75 hours on the oil. The Yanmar manual from 1978 for this tractor specifies a 100 hour OCI with filter change every 200. The oil was just starting to darken up with 75 hours on it. Before that it stays honey colored.
I had a couple of questions about this report. I am new to BITOG so I am trying to get a handle on everything. I grew up with the 3k mile OCI so this site has really opened my eyes.
1. Is there any way to get an idea of the total hours on the machine from the UOA? As I said I lean toward it having only 200 hours (325 now), but don't know for sure.
2. Is the Iron a concern? I ask because of the Blackstone comments. My Iron was at 9ppm, but the Univ Avg Iron was at 8ppm with 425hrs on the oil. That sure seems like a long OCI for 2 cylinder Yanmars. Some of the other Yanmar UOAs (tractors) I've seen show 10-15ppm of Iron with around 100hrs on the oil. Granted, those were 3 cylinder engines and not 2 cylinder. The longest factory OCI recommendation I've seen for the John Deeres with Yanmars is 200 hours.
Thanks a lot for any thoughts or insights. This tractor is very useful to me and I hope to keep it for a long time. I plan to go with the Blackstone recommendation and run 125hrs on the next OCI.
Blackstone Report-
MAKE/MODEL: Yanmar 2-cyl
FUEL TYPE: Diesel
ADDITIONAL INFO: 1978, Engine rebuilt in 2006 (Rings/Pistons/Liners/Bearings)
OIL TYPE & GRADE: Shell Rotella T 15W/40
OIL USE INTERVAL: 75 Hours
Comments: Thanks for the notes. We haven't specifically tested the 2TR20A engine, but we've seen a fair
amount of 2 cylinder Yanmar engines, so those averages were used for comparison. Those averages are
based off about 425 hours on the oil. Your run was shorter, so it might've been nice to see iron reading
lower (since it tracks with time on the oil). On the other hand, iron at 9 ppm isn't an excessive amount of
metal either. The TBN is robust, showing lots of active additive left in the oil. Go ahead and run up to 125
hours before checking back. Nice report.
The Universal Averages are the 2nd number.
Alum 3 3
Chrom 2 0
Iron 9________8
Copp 2 1
Lead 0 1
Tin 0 1
Moly 0 79
Nick 0 0
Mang 0 0
Silv 0 0
Titan 0 0
Potas 8 1
Boron 92 284
Silic 8________6
Sodiu 4 7
Calc 2078 1750
Magn 10 321
Phos 957 1073
Zinc 1134 1297
Bariu 0 0
Value should be
SUS Visc @ 210 F 74.2 69-80
cSt Visc @ 100 C 14.04 12.7-15.8
Flashpoint in F 430 >410
Fuel % Antifreeze % 0 0
Water % 0 0
Insolubles % 0.1 TBN 8.5 >1.0
TAN Not done