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Old 28 August 2011, 16:30   #1
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Oil Changes (Time scales)

Quick (probably) stupid question.

Going to change my gear oil having had about 60 hours on the water so far this season, but wondering if i should change the main engine oil as well or can this go for longer, maybe till its main service when its put to bed in December.

Any thoughts.

Engine is a BF40 Honda 4 stroke (2005).

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Old 28 August 2011, 17:14   #2
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If you can afford to change your engine oil on a more frequent basis than what the manufacturer recomends then do it!

The oil is the life blood of your engine and keeping it as clean as possible wll greatly increase your engines longevity...

When your engine is running there should be little or no metal to metal contact between the internal components.....they ride on a very thin film of oil (termed hydrodynamic lubrication) This film is often only microns thick but never the less allows the various parts to 'glide' up and over each other. As the oil gets contaminated with foreign particles the thin film between each component becomes more and more 'abrasive' and contributes to wear. It's viscosity also changes which affects the hydrodynamic lubrication process. Various other factors change also but there's not much point of going into that much detail here...

Hope this helps

Simon
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Old 29 August 2011, 03:09   #3
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Well worth doing in my view, especially with the engine oil as it is so easy to do. Gear oil is a bit more fiddly until you get the right bits and technique, but after that it is a breeze.

As Simon says, it will enhance the life and performance of your engine. The only down side is the environmental issue of what to do with the waste oil.

Edit: Fresh water flushing is another good one that many overlook.
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Old 29 August 2011, 03:28   #4
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Actions,

What's the recommended service interval (100 hrs?). Will you exceed this before the boat gets put to bed? How does the oil look? Do you tend to spend your running time at high revs or at tickover (like a club safety boat?)

I might be thinking of this wrong - but 100 hr service interval compared to most cars which now have a 10,000+ mile service period - this suggests you are driving your boat like driving a car at 100 mph everywhere (which is probably fair for what most people do in a rib - drive it hard and pretty fast). Whilst some people do extra oil changes on cars most wouldn't consider doing a 6000 mile change on a modern 4 stroke petrol.
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Old 29 August 2011, 04:37   #5
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Thanks for the replies,

Polwart, I would hope to acheive more than 100 hours before its next service but judging by the last two days of weather who knows.

Service manual states every 100 hours for both oils to be changed, however i'm sure i read somewhere on here maybe that in Salt water this should be halved?

And yes, i tend to be at the higher end of the rev's, unless wife is with me and then its a bit more sedate.

Martin - Got myself a gear oil pump this time judging by the mess i made doing it by hand on the old engine.

Well for the sake of a couple of bits of oil i think i will change it then, especially as it wont be serviced until December ish.

On that note, are the 4 strokes easy to fully service yourself or is a dealer best. Any links to any previous threads known, had a quick search but didnt find anything.
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Old 29 August 2011, 05:02   #6
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are the 4 strokes easy to fully service yourself or is a dealer best
Hondas are an absolute treat in my view, but it is very much a matter of personal taste.

Oils, plugs, fuel filter is a bit fiddly, oil filter, impeller, dab of grease on all the linkages and nipples. All easy to get to.
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Old 29 August 2011, 05:09   #7
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A screen grab of the schedule page of the manual....

And link to the manual in full:

http://marine.honda.com/pdf/manuals/31ZW4607.pdf
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Old 29 August 2011, 10:36   #8
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Cheers for the links Martin.

I'd like to service it myself and can certainly do the oils, plugs, filters, and maybe even attempt the impellor but i dont have a clue when it comes to cleaning any of the carbs, tightening belts if needed and idle speeds.

Do any courses exist that anyone knows of that cover servicing of four strokes, such as an RYA course. I'm thinking it would be cheaper in the long run and also should anything happen at sea give me an idea of what to look for.
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Old 29 August 2011, 10:44   #9
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Do any courses exist that anyone knows of that cover servicing of four strokes, such as an RYA course.
You are not the first person to ask that, but AFAIK there is only the diesel course.

You will find the carb bits and bobs as you become familiar with the engine, if you get a tricky bit just post a photo on here and wassisname or thingybob will chip in with something useful.
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Old 29 August 2011, 10:52   #10
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Diesel only, surely there is a gap in the market for them to exploit then.

I know i'd certianly do a course if it meant i could learn how to look after the engine and save on labour costs.

Oh well, i shall do the oil's now and then when it comes to the full service see how i get on. Rib.net better get some more space for uploading pics when i get stuck
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