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Old 04 December 2014, 07:36   #1
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Running-in

Over the last few weeks I've stripped-down and rebuilt the powerhead of my old Yamaha 30 (the same engine as the '689' Mariner version). Amongst the many new bits are new pistons and rings, running in newly-honed cylinders.

I was amazed when it started first time, ran quietly and smoke-free (even though I have halved the fuel:oil ratio). In fact, people will probably start saying "Ooh, my sewing machine runs as well as Hugh's engine"! )

The next step is running it in. I plan to run it carefully for about six hours, building up the RPM gradually during this time and not running at the same RPM for more than a minute or so. Does this sound about right?

(I am going to stick a piece of paper on the stern with 'Running-in. Please pass' written on it in Biro™...)

Cheers,

Hugh
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Old 04 December 2014, 08:05   #2
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Over the last few weeks I've stripped-down and rebuilt the powerhead of my old Yamaha 30 (the same engine as the '689' Mariner version). Amongst the many new bits are new pistons and rings, running in newly-honed cylinders.

I was amazed when it started first time, ran quietly and smoke-free (even though I have halved the fuel:oil ratio). In fact, people will probably start saying "Ooh, my sewing machine runs as well as Hugh's engine"! )

The next step is running it in. I plan to run it carefully for about six hours, building up the RPM gradually during this time and not running at the same RPM for more than a minute or so. Does this sound about right?

(I am going to stick a piece of paper on the stern with 'Running-in. Please pass' written on it in Biro™...)

Cheers,

Hugh
Hi hugh

I would look online for correct run in procedures for this engine to eliminate guess work,a digital tach would be ideal.
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Old 04 December 2014, 08:15   #3
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Boatinfo - The library, containing manuals, brochures and other technical documents from the last hundred years!

- that's where I found the procedure for running in the Merc after I did much the same thing......

Failing that, I have a Mariner Clymer that may help, if you get stuck let me know the year of your engine & I'll see if the manual covers it.
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Old 04 December 2014, 09:02   #4
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I know the old Mercs,and Yams I had and even e-tec recommended a little more oil in the mix when running in... Surely better to add a bit than hold back??
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Old 04 December 2014, 12:16   #5
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I know the old Mercs,and Yams I had and even e-tec recommended a little more oil in the mix when running in... Surely better to add a bit than hold back??
That's what I did. It is supposed to run at 100:1 but I halved the ratio to 50:1 (i.e, doubled the oil)
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Old 04 December 2014, 12:29   #6
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Personally, I'd just use it as normal taking care not to labour it or rev its nuts off.

There are a million and one "correct procedures" out there for running in an engine.
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Old 04 December 2014, 12:30   #7
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Try

Boatinfo - The library, containing manuals, brochures and other technical documents from the last hundred years!

- that's where I found the procedure for running in the Merc after I did much the same thing......

Failing that, I have a Mariner Clymer that may help, if you get stuck let me know the year of your engine & I'll see if the manual covers it.
Thank you. I'll do some digging...
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Old 06 December 2014, 13:53   #8
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User manual will have the info in
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Old 10 December 2014, 07:54   #9
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Personally, I'd just use it as normal taking care not to labour it or rev its nuts off.

There are a million and one "correct procedures" out there for running in an engine.
I suppose those procedures are maybe more important to be adhered to if you have warranty to worry about.

I just reckoned if I could find the appropriate one, then it would presumably be designed for my particular engine and be most appropriate. One thing is for sure with 2- strokes - doubling the oil for the first X hours is almost guaranteed!
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Old 10 December 2014, 08:27   #10
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If it was my engine ,I would run it on a 50:1 mix all the time. as for running it in ,
Dont over rev it,
Dont let it labour
Dont rev it up over 1,200 rpm out of gear.
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