Yanmar 1GM10 Oil Painting

[eebygum]

Had a bit of a disaster with the old (84) Yanmar 1GM on Sunday...... put the engine on for the last 2 miles up the Menai Strait after a great weekend and after 5 mins noticed blueish exhaust smoke and some oil in the exhaust water but revs OK.

After seeing some smoke in the cabin found the previously clean engine covered in oil which had also completely sprayed and painted the inside front and rear engine cover with oil ? Fortunately there was a swinging mooring within 50m which we got onto before cutting the engine. A nice man doing the Puffin Island cruises towed us home (and can the tourist who recorded our 'rescue' please get in touch as I want that bloody video !)

Other facts..
- The smoke I believe was caused by oil on the hot engine, water was being pumped out all the time
- The engine had worked fine earlier in the day, both idling and under load
- No Oil or heating alarms went off
- The engine did restart OK but was quickly shut off
- The oil could not have just dripped as it was well and truely sprayed over the engine compartment
- The oil level had been checked at the start of the day and was OK
- I refilled with some oil after the disaster and it literally flowed from the bottom of the engine. Not sure where it was coming from but it was no drip !

While I'm waiting for the local marine engineers to come out and check the engine over has anybody got any suggestions on the possible fault ???????

Thanks in advance

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Age is a question of mind over matter. If you don't mind, it doesn't matter.

 

[oldsaltoz]

Eebygum,

I had a Nanny do this to me on a delivery some years back, cabin filling with smoke, shut down, found oil all over bilge, and still dripping from the back of the engine; after much wriggling and a few choice words, I noticed a 10 mm diameter bolt amongst the crud under the sump. Turned out to be one of the bolts that held the block to the mount frame, but the hole it lived in went into the sump; replaced bolt after making a locking tab and filled with oil, problem fixed. Well almost, it took 4 hours to clean the mess up.

So, check the bilge first for stray bolts, I have seen other engines with the same set up, locking tabs will prevent the problem.


Andavagoodweekend, Old Salt Oz /forums/images/icons/cool.gif

 

[vyv_cox]

My thoughts too. If oil that you pour in runs straight out it cannot be a seal failure or leakage from any normal orifice. Check the sump drain plug first. There is probably enough windage from belts and coupling to blow oil falling from there all over the engine compartment. Next, as oldsaltoz suggests, look for any other bolts than may have come loose.

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[John7]

I take it the dip stick was in OK, I had oil and smoke once when this hadn't been put back correctly (its a real sod to get at and has to be placed by feel only!). Though it sounds like less oil spread about than you had.

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[Evadne]

Yup, it sounds like you've got an oil leak. I've had my Yanmar leak from the (painted steel) exterior oil lines that adorn the engine block, as well as from a cracked casting on the oil filter (over-enthusiastic with the spanners). One pin hole on an oil line was enough to empty the sump into the bilges in five minutes. They are available as Yanmar spares, but I found smearing them with marine epoxy (after degreasing of course) was not only a good get-you-home but lasted the rest of the season, although I wouldn't recommend it for long motoring passages.

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[wiggy]

I had exactly the same last year with GM10 and as was mentioned I also checked oil in the morning. The problem I had was that I wedged the dip stick down the side of the engine rather that in the hole that cant be seen without climing into the engine space. Took an age to clean and it dripped for ever but is an easy mistake and having tried it again it is very easy to miss hole and it feels the same as you push (ooh er misses).


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[Gordonmc]

Oil filter seals OK?
I had mine blow, letting the sump empty itself. The rubber seals on the filter had failed to bed into the housing groove properly.
Cleaning the bilge was not funny.

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[johnt]

if the leak is on the left, possibly dipstick

if its on the right it could be the filter seal BUT

The 1GM has 3 external oil lines ...check all three , they could be corroded, you almost certainly have an oil line running up behind the starter moter .. which makes it vulnerable to galavanic or intercrystaline corrosion .... no rust to see ..just a big hole!

My article in PBO (rebuilding a 2GM) a couple of years back raised this point, I found the pipe behind the starter almost eaten through ..and with an 84 model it could easily be that

PS>>>>>>>>>>dont think its got a sump drain !

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[Porthandbuoy]

I had exactly the same problem with one of my Yanmars (I sailed a cat). There's a lub-oil pipe running under the engine and up towards the top. I can't remember the exact layout, but I can remember that it is mild steel, painted, and carries very hot oil under pressure. If the paint fails, and you have any salt water in your bilge, (who doesn't) it will corrode. We're not talking a leak here, it really belts it out.
The only answer is a new pipe, from Yanmar of course, at great expense.

<hr width=100% size=1>"Mariposa"

 

[JimMcMillan]

Check the oil pipe which runs under the water pump.Drips from this corrode the pipe. Costs about 35 quid to replace.Common fault.

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