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Discussion Starter · #1 ·
Sorry to raise a question that has been around before, but I can't find a definitive answer. My original paper manual for my 3GMD (which covers the 1, 2 and 3 GM's and 3HM) has a separate note specifically for the 3GMD engine alone, that the oil in the tranny is different from the oil used in the engine and a warning to use the proper oil, and refers me to a chart on another page. That chart shows the engine oil and tranny oil to be the same for the 1, 2 and 3GM, while the 3HM uses Dexron. I also have a downloaded version of the 3GMD manual, and it has the same note, but no cross reference or any reference at all to the specific oil to be used in the tranny. In the downloaded version, the note is explicit in saying that the 3GMD and 3HM use different tranny oil than the engine, although there is no oil spec that i can find in that manual.

Does anyone have a source for a definitive answer on the tranny oil (engine oil or Dexron)?

Also, interesting definition of how to measure the tranny oil level in both versions of the manual: ".....check with screwing the dipstick". I understand that the common consensus is that this means to unscrew the dipstick and leave it resting on the top of the threads, but hard to get that from the written words :)
 

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We have a 3GM30F in our boat. I'm not familiar with a "3GMD" variant. What does the "D" signify?

But I do know about that discrepancy. The manuals contradict themselves. I was told by a mechanic that I trust to use straight 30W motor oil in our Kanzaki transmission. We check the level with the dipstick unscrewed.
 

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Discussion Starter · #3 ·
Thanks, John. The 3GMD was the first version of what became the 3GM30. It was produced 1981-1983 or so, at which point it became the 3GM30. The D is rated at 20 hp sustained running at 3400, with 22.5hp at 3600 for one hour max, while the 30 version ups the rating to 24 hp at 3400 sustained and 27 at 3600. Other than whatever they did to up the ratings, it appears to be almost exactly the same engine and transmission. My concern is that both manuals make a specific point of saying that the 3GM uses a different tranny fluid than engine oil. I believe that my new to me 1985 Marshall 22 catboat has engine oil in the tranny, based on its light golden color, and the concern is that it seems to be contra to what the book calls for, although it runs just great. Based on the year of the boat, I assumed the motor was a 3GM30, until I found a plate on it saying it is a 3GMD. It is certainly more than enough power for a 22' sailboat :) , easily pushes it well past hull speed of 6.1 to a bit over 7 knots, and makes it feel sort of like a motorboat as the bow lifts. Not an efficient way to cruise, but fun now and then.
 

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Oh, that's an interesting bit of Yanmar history. Sound like the "D" is plenty of engine for your boat, too. I love those Marshall catboats, by the way.

Anyway, like I said, our manual has contradictory info about the tranny oil, too. In one place it says to use ATF, in another it says to use the same weight/type as the engine oil. When we got the boat, I asked a trusted mechanic and he said that info about the ATF is incorrect and only applies to the 3HM35.
 

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Crazy that a contradiction like that got by the proof readers and the users.. do you know if any correction/errata document was ever issued?

Many gears DO use ATF so I'd never have questioned it.....
 

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On most transmissions used by Yanmar, the type of 'oil' is usually stamped into the transmission ID plate (along with Mod. and Serial #'s) ... and may be different from the published 'manuals'.
 

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Discussion Starter · #7 ·
Thanks for the updates. I have not found any reference to any tech updates, and the on-line manual I downloaded was from Yanmar so I would have expected any corrections to be in that - it is not the same as the original manual (in several languages on each page) so they could have easily changed the spec if they wanted to. I have not found the traqnny ID plate yet - it has been painted over along with the prior owner's regular touch up painting of the engine with Yanmar grey paint - nice thick stuff that seems to fill in engraved info nicely :( I tend to think that the engine oil is likely correct, since the prior mechanic used it in mine (I'm pretty sure from color) and lots of people on these forums seem to think it is right also. I want to change it just for routine maintenance over the lay-up, but I may wait a little longer to see if any more info surfaces.
 

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yanmar 3gmd

I have the yanmar 3gmD. I think the D stands for direct sea water cooling where a 3gmF stands for fresh water cooling. I was also confused by the different oil spec in the manuals. On my transmission I changed oil using a 40 WT as this is what a Yanmar dealer told me to use. Since then I did find the name plate on the Kanzaki (V drive transmission) that says use 15-30 wt. I have not changed the trans oil since seeing this new information and have run 50 hours without problems- maybe I should change to the 15-30 wt. I agree the oil specs are confusing- maybe I should contact Yanmar factory and see what they say.
 

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Discussion Starter · #9 ·
Just a quick update. I found the ID plate on the Kz transmission with my 3GMD. As best as I can read it upside down and through the touch up paint, it calls for use of .3 liters of 20/30 weight oil. Since there has never been a multi-weight 20/30 that I know of, I assume that this means it should have either 20 or 30 weight engine oil. I understand that Yanmar has updated the original engine oil spec form the old 30/40 to a multi-weight 15-40, so i don't know if there is an update to the tranny oil spec as well. In any case, it is clear that the manual references to ATF are not correct.
 

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Just curious what the ATF fluid would do to the transmission- would it damage it?
 

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Discussion Starter · #11 ·
ATF is much thinner than any grade of engine oil. If you use ATF I would expect that the various bearing and wear surfaces are more subject to damage and premature failure. If ATF was required and you used engine oil, I suspect that the oil might not flow to all of the places with tight clearances and also cause premature wear.
 

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"paint - nice thick stuff that seems to fill in engraved info nicely" Some automotive brake cleaner should clean that paint out very quickly. Or, some gel stripper left on for a while, following with a wire brush or "acid" brush (stiff plastic).

IIRC the 3H and 3G series use different transmissions so the same fluid might kill one or both. Dexron has been obsoleted, I think they are up to Dexron-IV by now. But using the wrong type of ATF fluid can ruin a transmission or the seals in it, so you'd want to make Real Damn Sure before adding anything to it.
 

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Asking again

Does anyone have a source for a definitive answer on the tranny oil (engine oil or Dexron)?
I think one of your previous posts says the tranny name plate says 20/30. This would be the weight of diesel engine oil. You DO NOT want to put in ATF oil into your transmission.

The yanmar manuals have many errors when calling out the transmission oil. I have a 3gmd also but with the v-drive Kansaki transmission. I used the same 40 weight oil in both the transmision and engine just to make life easy. The yanmar manuals are correct for engine oil but for transmission- follow the name plate data.
 

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Asking again?
Previous posts?

Come on, guys. This thread has been dead for nearly four years and wrapper has no previous posts in it.

You want a definitive answer? Ask Yanmar, and specify what transmission you're talking about.

Yanmar America Corporation

101 International Parkway
Adairsville, GA 30103
P 770.877.9894
F 770.877.9009

Or use the "Questions?" button on YANMAR | Yanmar North America

They're not so hard to contact. And they are, by definition, the sole definitive source of information on their products.
 

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Here is a good link that tells what oil for what transmission:
http://www.sailnet.com/forums/diese...nsmission-oil-confusion-manuals-new-post.html

I see where a KBW10D can be mated to a Yanmar 3GMD and the trans calls for Dexron II/III ATF 24 ounces- so you need to see if you have a KBW 10D transmission.

(Note the # after oil type is volume in ounces)
Page:
Capacity Chart
Model Application(s) Fluid Type/ Ounces/ Rotation

KM2A 1GM/2GM/3GM SAE 30W /10 /Clockwise
KM2C 1GM10/2GM20 SAE 30W 10 Clockwise
KM2P 1GM10/2GM20/3GM30V SAE 30W 10 Clockwise
KM2P-1 2YM15/3YM20/3YM30 SAE 30W 10 Clockwise
KM3A 3GM/3GMF/3JH2 SAE 30W 15 Clockwise
KM3A-1 3JH2E SAE 30W 15 Clockwise
KM3A-2 3JH3E/4JH3E SAE 30W 15 Clockwise
KM3P 3GM30F SAE 30W 12 Clockwise
KM3P-1 3JH2E SAE 30W 12 Clockwise
KM3P-2 4JH2E SAE 30W 12 Clockwise
KM3P-3 3JH3 SAE 30W 12 Clockwise
KM3P-4 3JH3E/4JH3E SAE 30W 12 Clockwise
KM3V 1GM/2GM20/3GM30V SAE 30W 10 Clockwise
KM35A 3JH3/4JH3 SAE 30W 22 Clockwise
KM35A2 4JH4E SAE 30W 22 Clockwise
KM35P 3JH3/4JH3 SAE 30W 17 Clockwise
KM4A 4JH ALL/4JH2 ALL SAE 30W 44 Bi-Rotation
KM4A-1 3JH3E/4JH3E SAE 30W 44 Bi-Rotation
KM5A 4LH-TE/THE/DTE SAE 30W 71 Bi-Rotation
KMH4A 4JH3 TURBO SAE 30W 68 Bi-Rotation
KMH6A 6LY(A)-UTE SAE 30W 135 Bi-Rotation
KMH60A 6LYA/6LY2A-STP SAE 30W 135 Bi-Rotation
KMH61A 6LY3-ETP SAE 30W 135 Bi-Rotation
KBW10 2QM15 Dexron II/III ATF 24 Clockwise
KBW10A 2QM20H Dexron II/III ATF 24 Clockwise
KBW10B 2QM15 Dexron II/III ATF 24 Clockwise
KBW10D 3GMD Dexron II/III ATF 24 Clockwise
KBW10E 3HM/3HM35 Dexron II/III ATF 24 Clockwise
KBW20 4JHE/4JH2E Dexron II/III ATF 40 Clockwise
KBW20-1 4JH3E Dexron II/III ATF 40 Clockwise
KBW21 4JH-TE/4JH2-TE Dexron II/III ATF 40 Clockwise
SD20 GM/YM SAE 80/90 GL4/5 74 Clockwise
SD30/31 JH up to 56hp SAE 80/90 GL4/5 74 Clockwise
SD40 JH3/JH4 non turbo HP Gear Lube 71 Clockwise
SD40-T 4JH3-TE HP Gear Lube 71 Clockwise
SD50 Replaces SD40 HP Gear Lube 74 Clockwise
YX70S-1 6CX-ETE SAE 30W 169 Bi-Rotation

Transmission Specifications Application
Manufacturer Model AKA Ratio(s) Fluid Type Ounces

Velvet Drive 1005 V-Drive 1.2:1 / 2.5:1 DEXRON II/III ATF 28
1017 71 1:01 DEXRON II/III ATF 64
1017 71 1:05 DEXRON II/III ATF 94
1018 72 1:01 DEXRON II/III ATF 64
1018 72 1.52:1 / 2.91:1 DEXRON II/III ATF 94
2001-001 to 006 5000 ALL DEXRON II/III ATF 64
2002-002 to 005 5000 V-Drive ALL DEXRON II/III ATF 94

Walters RV-10 ALL SAE 30W 16
RV-20/26 ALL SAE 30W 33
RV-30/36 ALL SAE 30W 48
RV-40 ALL SAE 30W 64
RV-48 ALL SAE 30W 64

Hurth/ZF HBW40/50 ZF4M/5M ALL DEXRON II/III ATF 10
HBW100 ZF10M ALL DEXRON II/III ATF 12
HBW150A ZF15M-A ALL DEXRON II/III ATF 17
HBW125/150 ZF12M/15M ALL DEXRON II/III ATF 19
HBW150V ZF15M-1V ALL DEXRON II/III ATF 34
HBW250 ZF25M ALL DEXRON II/III ATF 25
HSW250A ZF25A ALL DEXRON II/III ATF 60
HSW250H ZF25A ALL DEXRON II/III ATF 68
HSW450A2 ZF45A ALL DEXRON II/III ATF 68
HSW450H2 ZF45H ALL DEXRON II/III ATF 101
HSW630A ZF63-1A ALL DEXRON II/III ATF 135
HSW630H ZF63-1H ALL DEXRON II/III ATF 128
HSW630V ZF63-1V ALL DEXRON II/III ATF 135
HSW800A2 ZF80-A2 ALL DEXRON II/III ATF 186
HSW800V1/V2 ZF80-1V/2V ALL DEXRON II/III ATF 236
IRM220A ZF220A ALL SAE 30W 135
IRM220PL ZF220 ALL SAE 30W 135
IRM220V-LD ZF220V ALL SAE 30W 169
IRM220V-2 ZF220V ALL SAE 30W 135
IRM280A ZF280A ALL SAE 30W 135
IRM280PL ZF280P ALL SAE 30W 135
IRM280V-DL ZF280IV ALL SAE 30W 202
IRM301A ZF301A ALL SAE 30W 220
IRM301PL ZF301C ALL SAE 30W 220

Engine Oil (Note for older models refer to your manual- manual is correct):
Sailboat Supplies, Engine Parts and Boat Parts

Yanmar Engine Oil and Fuel Capacity Engine Model Quarts of Oil* Oil Type** Quarts of Coolant*
Recommended Coolant

1GM10 1.6 15W40 N/A YG30R or DexCool***
2GM20F 2.1 15W40 0.77 YG30R or DexCool***
3GM30F 2.7 15W40 0.9 YG30R or DexCool***
2YM15 1.9 15W40 3.2 YG30R or DexCool***
3YM20 2.6 15W40 4.3 YG30R or DexCool***
3YM30 2.6 15W40 4.6 YG30R or DexCool***
3JH3E 5.2 15W40 5.6 YG30R or DexCool***
4JH3E 5.6 15W40 7.2 YG30R or DexCool***
4JH3-TURBO 7.4 15W40 7.2 YG30R or DexCool***
3JH4E 5.3 15W40 4.8 YG30R or DexCool***
4JH4E 5.8 15W40 6.4 YG30R or DexCool***
4JH4-TURBO 6 15W40 7.6 YG30R or DexCool***
4LHA-TURBO 13.7 15W40 14.8 YG30R or DexCool***
6LP(A)-TURBO 10.6 15W40 14 YG30R or DexCool***
6LY(2)A-TURBO 21 15W40 21 YG30R or DexCool***
6LY3-TURBO 20 15W40 30 YG30R or DexCool***
4BY 8.5 5W40-SYNTHETIC 10.6 YG30R or DexCool***
6BY 11.5 5W40-SYNTHETIC 14.3 YG30R or DexCool***
6CX-ETE 24 15W40 38 YG30R or DexCool***
6CX-GTE(2) 23 15W40 38 YG30R or DexCool***
6SY-TURBO 29 15W40 42 YG30R or DexCool***
8SY-TURBO 35 15W40 79 YG30R or DexCool***
* Capacity levels should be considered approximate.
** Engine oil specifications will vary by location.
*** All new / replacement installations of Antifreeze in Yanmar engines must include the following specifications:
Silicate - free
Phosphate - free
Organic acid base
Protects all metals including Aluminum
Meets or exceeds ASTM D3306 &D4985
Long Life
Contains no borates, nitrates, amines, or nitrites
 

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Sounds like you rub the fluid on your finger, and if it is red, use Dexron III. If it is brown, use SAE30(ND).

Unless you've got one of the SD models, in which case, you'll be going shopping.

Or did I miss another option?
 

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Sounds like you rub the fluid on your finger, and if it is red, use Dexron III. If it is brown, use SAE30(ND).

Unless you've got one of the SD models, in which case, you'll be going shopping.

Or did I miss another option?
Some transmission use gear oil.
 

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Gear oil: I thought that was the SD series, using the same 75W90 range that many auto differentials and some manual transmissions use. I've seen SAE30 in Honda, 75W90 from Toyota, I'm sure there are others. But the vast majority of the non-ATF on your list are SAE30.
 

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that list is good, but interesting nonetheless

I have a 2qm15 I was about to buy and the kanzaki kbw10 transmission CLEARLY STATES atf OR sae30 oil
 
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