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Old 09-28-2012
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Yanmar YQM15 - hard starting

Considering purchasing a 1981 sailboat with Yanmar YQM15 engine. There is no hour meter. This model engine does not have glow plugs.

Engine takes about 5 - 10 seconds of cranking before it starts, but seems to run fine after it starts (although I don't have much experience). This is in the Puget Sound, so below decks temperature is fairly cool - upper 40's/lower 50's. Engine manual says that some cranking is normal for cold weather starting.

Should I be concerned that the engine doesn't start instantly? What's considered "cold weather", with regards to engine starting?
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Old 09-28-2012
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Yanmar YQM15 - hard starting

Do you give it a little throttle when starting? Doesn't seem too bad to me, compared to the 2qm15 I used to have. How does it run under load?
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Re: Yanmar YQM15 - hard starting

If I were trying to start my 2GM20F in those temps, it would take 5 seconds or so, and it's a quick starting engine otherwise. Mine starts much better in the cool/cold if I put the throttle all the way forward before cranking and then pull it back to idle right away.
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Old 09-29-2012
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Re: Yanmar YQM15 - hard starting

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Originally Posted by arf145 View Post
Mine starts much better in the cool/cold if I put the throttle all the way forward before cranking and then pull it back to idle right away.
That's the way I start mine also. Five seconds, huh? So I guess it's not just me - that makes me feel better.

Engine seems to run fine once it gets going.
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Re: Yanmar YQM15 - hard starting

It seems like I remember getting that technique out of the Yanmar book somewhere. I've only needed to use it in the later fall. With typical sailing weather temps in the upper Chesapeake (upper 60s on up) our 25-yr-old 2GM20F starts in a second or two with the speed control back at idle.
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Old 09-30-2012
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Re: Yanmar YQM15 - hard starting

Living on the east coast we're used to cold starting conditions. I have a 2QM15 and 5 seconds of crank time is about normal. Keep it clean, feed it fresh fuel, and change the oil and it should last a long time.
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Old 11-13-2012
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Re: Yanmar YQM15 - hard starting

Light your propane torch and heat the air going in. Adding a bit more weight to the starting handle helps.
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Old 11-18-2012
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Re: Yanmar YQM15 - hard starting

Is there any harm to spraying a little "Heet" fluid into the air intake of a Yanmar 3GM30F diesel for cold starts? Its taking longer and longer, 20-30 secs of total cranking spread over two attempts to start it in the cool damp winter of the Pacific NW. I am worried about raw water getting sucked into the engine with all this cranking, not to mention the stress on the starter and batteries. However, one quick spritz of HEET into the air intake and the thing starts on first crank (1-2 secs max). Its a miracle drug as far as I can tell. My only concern is , is it bad for the engine in any way to use this spray ?

Last edited by junaido; 11-18-2012 at 10:48 PM.
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Old 11-19-2012
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Re: Yanmar YQM15 - hard starting

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Originally Posted by junaido View Post
Is there any harm to spraying a little "Heet" fluid into the air intake of a Yanmar 3GM30F diesel for cold starts? ?
Use as recommended yada yada.. thousands of truckers can't be wrong.

It's better than shoving a propane torch into your air intake (maybe).

It's better than letting the starter get hot enough to warm the engine (certainly).
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Re: Yanmar YQM15 - hard starting

junaido, have you tried starting with the throttle on max and then immediately pulling back when it starts? This really does work on my 2GM20F. It started up in a couple of seconds yesterday, when the temp was around 50 and the night had been in the 40s.
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