Yanmar Engine

Fixing Oil Lines Yanmar 1GM10

Part Failure: 
My recently acquired, 1984 Evelyn 26 “Skylark” came with a factory installed Yanmar 1GM10 engine. The sailboat had been sitting for a few years before I acquired it and had a chance to start it for the first time. Sounded great, and got me out to my first regatta. Then a small “catastrophic” engine component failure put the season’s racing on hold  just when it was beginning to get fun. The scene down below on the cabin sole after my that first race was kind of disheartening. The engine had spilled the better part of all of its oil into the bilge at some point while motoring out and in from my first race.

The Oil Spill:
Well, in retrospect I was pretty luck to have  made it back to the dock – not realizing the oil level was critically low. The intensely loud oil pressure warning horn never went off – which was fortunate for me because my nerves were pretty frazzled from the race. As we tied the boat up, I looked below to see oil everywhere. Worst of all, it was on the spinnaker due to oil floating on top of the bulge water that had sloshed around the cabin sole. Getting a diesel-engine-oiled-soaked spinnaker off the boat without everything getting oily was a task.

The Diagnosis:
My first thought was a bearing seal was the culprit. On closer inspection the only place that had any oil on it was one small oil line on the lower front of the engine. That was the problem – a pinhole in a small oil line.
(see engine pic and parts list below)

Rust Through is Bad:
I found out from my internet researching that all three oil supply lines are at risk for potential rust-through leakage. The small line that I removed from my engine looked like an old rusted brake line on ’87 Ford F100. Pretty much paper thin. So, I removed the longer line in front of and above the smaller one and found it to be deeply pitted with rust also.

Where I Found Parts:
(see links oil lines Yanmar 1GM10 diesel engine Torresen parts – now Toad Marine  below)
Some info on the internet is easy to find, but the 100 year-old Japanese Yanmar Co. seems shrouded in mystery. Most of the information I found came from primary sources on sailboat forums. The Brits, I noticed, seem to have outlandishly higher prices on their Yanmar replacement parts – not sure why. Here in the U.S. I had difficulty locating a supplier easily, but thanks to Good Old Boat I found it.

Yanmar 1GM10 Engine

 

 

 

 

 

 

 

 

 

 

 

 

As an aside: Exhaust Elbow Problems Too?
While searching, I also found out that the exhaust elbow is prone to rusting out. A link to a U.S. aftermarket maker at http://www.exhaustelbow.com/ will have that fixed in stainless steel for about $120.installed_elbow_yanmar_1gm10

Quick and Dirty Temporary Fix:
I just needed to get the engine running so I could winterize it. I brazed the pinhole and will put the engine back together for a short run to get some antifreeze through it. Then during the winter I may pull the engine out of the boat and clean the whole thing to remove the pealing paint and surface rust.

Yanmar 1Gm10 Oil Line

 

Yanmar.1GM10.Engine.Oil.Supply.Line.Parts.List

 

All three oil lines for Yanmar 1GM10 diesel engine in red 1,6, and 11

Be sure to order new sets of copper washers to be sure they seat tightly. Note numbers 4 and 9 are the same size number 14 is smaller. Check to be sure you get four washers per oil line.

Note: These Are Direct Links to Torrensen Marine Parts:

Ref. Part # Description Quantity
Req’d
Price
Each
1 128170-39010 Lube Oil Pipe (B) Add to Cart
1
52.35
3 103854-39540 Pipe Joint Bolt Add to Cart
2
13.25
4 23414-120000 Copper washer 12mm Add to Cart
4
0.85
5 103854-39140 Oil pipe banjo bolt Add to Cart
2
7.03
6 128170-39020 Lube Oil Pipe (B) Add to Cart
1
69.85
8 103854-39540 Pipe Joint Bolt Add to Cart
2
13.25
9 23414-120000 Copper washer 12mm Add to Cart
4
0.85
10 103854-39140 Oil pipe banjo bolt Add to Cart
2
7.03
11 128170-39200 Lube Oil Pipe Add to Cart
1
22.35
13 103288-39170 JOINT 8
Part number has changed to:
Yanmar 129150-39150
2
14 23414-080000 8mm copper washer Add to Cart
4
0.76
15 101147-59810 BOLT, PIPE JOINT
Part number has changed to:
Yanmar 105582-59150
2
16 105582-39140 RETAINER (A) Add to Cart
1
5.45
17 124060-39451 Oil Pressure Sender
Part number has changed to:
Yanmar 124060-39452
1

 

Yanmar advertising refers to the 1Gm10 engine a “Gem” – it is an awesome little engine: