Engine service?

[Hpd]

Hi ive got a 2007 Mariner 40hp Fourstroke outboard.

Just wondering how many of you service these yourselves and what's involved? I had a search for a service manual but couldn't find one.

Any advice about what's involved would be great!

[smallribber]

Originally Posted by Hpd

Hi ive got a 2007 Mariner 40hp Fourstroke outboard.

Just wondering how many of you service these yourselves and what's involved? I had a search for a service manual but couldn't find one.

Any advice about what's involved would be great!

Easy to do yourself and once you do it the first time you will never look back.

Do any or all of the following at a timescale that you feel is necessary, some will say every year but I think that is wasteful and bad for the envirment. I do various bits at a much larger time frame than this but that is your call:

1) Change the main engine oil
2) Change the gearbox oil
3) change the impeller (mine last over 4 years but others will disagree)
4) Grease any of the linkages under the hood
5) Grease any moving parts in the gear change system and any other pivot points
6) You could change the spark plugs but mine last years and years.

[Johno99]

I had a Yamaha 40hp serviced in my driveway a couple of years ago. I stood an watched the guy because I wanted to see what was involved. To be honest I felt ripped off, he changed the oil, greased up, sprayed with WD40 and not much more, I told him not do change the plugs as I had already changed them recently. I asked if he was going to do anything to the carbs and he asked me if I hadn’t any problems with them and he said he wouldn’t normally do them in a service and it would be extra. As it was there was a problem with a part which hold the impeller so he would need to order the part and come back. Again extra. I ordered the part, dropped the leg and fitted the part, easy enough. IMHO I’d have a go myself. Try YouTube.

[Fenlander]

There is usually a maintenance schedule and enough data in the owners manual for routine servicing. I'd be surprised if there wasn't a manual online somewhere.

Anyway a generic list for a carb model (I'm assuming) 4-stroke of that age/size would be...

Grease all nipples and other links etc.
Check over for tightness of all fixings.
Change engine oil and filter.
Remove and inspect/test thermostat.
Check, gap, clean or replace plugs.
Clean or replace fuel filter.
Check ignition timing.
Check idle speed and reset if needed (If running well don't fiddle with mixture screws).
Check anodes external and internal (internal often missed, there may be several).
Replace water pump impeller.
Change gear case oil.
Remove prop and grease splines.
Check valve clearances and set if required.
Check timing belt and consider changing even if it looks OK if age is unknown.
Check power trim fluid (if fitted).

What you do from this list will depend on knowledge of previous maintenance in the different areas but if you don't have that information at least checking everything gives you a known position going forward.

[spartacus]

Most servicing is straight forward. Build up a good selection of tools, ratchets, rubber mallet, marine grease, multi-meter for electrical issues. Normally carbs won't be stripped, unless there's a problem. You can release the brass hex nut on the fuel bowl to see if there is contaminated fuel. If the engine was running like a bag of spanners then you're getting into ultrasonically cleaning the carbs, new caskets, etc.

On new 4-stroke engines, it's plug and play with a laptop and running diagnostics for fuel injection, logged fault codes, etc. Don't know much about 4-strokes, but from what I understand the timing belt is due after 5 years or 100 hours plus tensioner pulley.

Goes without saying - buy genuine parts - we've had numerous conversations on the site regards pattern parts, gaskets, thermostats, fuel connectors. You pay your money and make your choice and all that.

Manual here (up to 2006): https://haynes.com/en-gb/honda-four-...xoC9pEQAvD_BwE

[Fenlander]

Just had a skim round the net. Is this your motor...

https://www.manualslib.com/manual/10...ke.html#manual

[Hpd]

Awesome thanks for the replies, much appreciated. Will read up and order the servicing bits ��������

[Hpd]

Perfect, thanks! don’t know how I missed that

[smallribber]

Originally Posted by Fenlander

There is usually a maintenance schedule and enough data in the owners manual for routine servicing. I'd be surprised if there wasn't a manual online somewhere.

Anyway a generic list for a carb model (I'm assuming) 4-stroke of that age/size would be...

Grease all nipples and other links etc.
Check over for tightness of all fixings.
Change engine oil and filter.
Remove and inspect/test thermostat.
Check, gap, clean or replace plugs.
Clean or replace fuel filter.
Check ignition timing.
Check idle speed and reset if needed (If running well don't fiddle with mixture screws).
Check anodes external and internal (internal often missed, there may be several).
Replace water pump impeller.
Change gear case oil.
Remove prop and grease splines.
Check valve clearances and set if required.
Check timing belt and consider changing even if it looks OK if age is unknown.
Check power trim fluid (if fitted).

What you do from this list will depend on knowledge of previous maintenance in the different areas but if you don't have that information at least checking everything gives you a known position going forward.

A comprehensive list of everything. If that ain’t enough to put a new to working on his own engine bloke off I don’t know what is.

Granted I forgot oil and fuel filter in my list

[gpsguru]

Originally Posted by Hpd

Hi ive got a 2007 Mariner 40hp Fourstroke outboard.

Just wondering how many of you service these yourselves and what's involved? I had a search for a service manual but couldn't find one.

Any advice about what's involved would be great!

All you need to do is to order a 100, or 300 hour service kit from a Mercury dealer.

The difference between them is the 300 hour kit includes the impeller kit.

Everything you need to do and change is in the kit.

[Hpd]

Thanks that’s what I’ll do. Is it worth investing in diagnostic stuff to see fault codes, hours, temp etc? Any recommendations?

[beamishken]

Originally Posted by Hpd

Thanks that’s what I’ll do. Is it worth investing in diagnostic stuff to see fault codes, hours, temp etc? Any recommendations?

Unless you have a problem diagnostics gear isnt essential for general servicing. Its nice to see hours run at what rpm band etc but unless you have a problem to diagnose then you wont need it. You sometimes find spook codes found in ecm's but they just lay dormant unless there is an issue then you get a warning light up. Generaly when you go into diagnostics with a fault you have several codes, I clear them off & see what returns that then points you in the direction of the fault.
Stick to a good regular service schedule & you probably never need diagnostics.

[Matt]

This ^^.
The DDT setup I have by my desk here is >£1000 to buy. Fortunately I didn't buy it, I just borrowed it - but for a normal service, it doesn't get used. Although it IS interesting seeing the rpm vs time numbers.