How to Tuneup and Maintain a Mercury 4-Stroke Outboard | My Boat Classic DIY

[@kimfortney5882]

on the 150 hp plug change you mention problemmatic no. 4 plug removal you breeze right by that. What do you use to get that no.4 plug out? That the hardest part of the maintaince.

[@rickfascinato5758]

Thank you for your informative video, while doing my oil change I accidentally poured a small Tic Tac size two piece of foil seal from the oil jug into my oil fill on the outboard is this something I should be concerned about? Thanks in advance

[@davesmith2733]

Yes if it blocked an oil way. probably find it in filter if your lucky

[@davesmith2733]

To help get the spark plug back in .....fit a short piece of old fuel hose over end of plug and start the thread by hand and if you did cross thread it the hose would simply slip and do no damage .works with hard to get at bolts as well

[@1hovermale]

How do you access plug #4?

[@topanoreal]

Iam indonesian,how to get the sparepart my mercury machine 1040203HL,Mercury 2stroke 40hp 3carb, Thank you

[@TheJimmyjam1958]

Like most, I wish someone would post a solution to getting the 4th plug back in. I got it out but getting it back in was a half hour job and Im still not sure if it’s in right.

[@malcolmmsk]

A socket extension Flexi joint is used so you can nip up the plug after you have hand screwed in the plug to ensure it doesn't go in cross threaded.

[@karalewis2908]

Hi Mr.Gridly?My name is Kara and I have a 2001 Yamaha 25hp 4stroke F25ELHZ and its surging at full throttle.Do you have any suggestion or diagnose?

[@SpeedXtreme]

What about the accessory drive belt? replace at 300 hours or as needed? if replacement is required is it as easy as removing the alternator pulley to replace the belt?

[@mikenguyentxable]

Yes I want to know also. How easy is it to replace the Alternator Drive Belt. Looks like a 2 minute job but no-one has a how to video or instructions on how to replace it.

[@joho2251]

There must be a mistake when it comes to the spark plug gap - ”8 mm” should probably be ”0,8 mm”.

[@antoinephillips]

Its 8mm which = 0.032 in. See ZFR5F spark plug specs for reference

[@paulehrlich9653]

@@antoinephillips 8mm is not .032

[@christianscioscia253]

agreed, it should be 0.8 mm

[@vaskodimoski5690]

I have never seen spark plug with 8mm gap must have a nuclear coil

[@elitebowman5386]

Hi, good video for a diy person. I have a older 75 Mercury Outboard motor, 2 stroke. My transom is bad and pulling apart on my Blue Fin 17'10 Sportsman's boat. I want to take my motor off and fix transom. I know how to take most of the controls/fittings off from my motor. But I am nervous about unhooking the throttle system. I'm not a mechanic, but can get thru minor problems. Can you tell me how to unhook the throttle system, or tell me where I could find a video to do that? I have been looking all over on KZbin but most don't go that far to show how too. Not on a Mercury anyways. Thank you for taking the time to show these videos.

[@johnjacob6774]

best bet take plenty of pics before disassembling

[@ronaldliboy1243]

which is a good comprenssion in a outboard used boats motor?

[@111day1]

What’s the trick to removing that lower plug?

[@jeremytoms9698]

Same as what others have written. I use a deep socket version of the spark plug socket, small extender on a socket wrench installed in that order. Reverse the process to reinstall the plug. I just have Canadian Tire Mastercraft tools, but I'm sure Snap-On makes tools that'll make it more of a breeze. I find fogging the 4th cylinder to be the real pain... That's the trick I want to know!

[@edwardabrahamiii3742]

When is the first oil change on the 150 mercury? Im asking cuz i just bought me 1 at like 20 hrs im talking about break in

[@Tylnorton]

100 hours/Once a year. If you're on a colder climate where you store your boat for the winter, it's best you change oil every fall if you don't exceed 100 hours of run time that year.

[@edwardabrahamiii3742]

@@Tylnorton oh i can gaurantee you my merc 150 will be sitting outside year round im from a remote spot in Alaska i aint got no heated garage for my vehicle to be sitting inside of

[@edwardabrahamiii3742]

@@Tylnorton but my dad does oil changes only every spring on his 2008-09 yamaha 90 4 stroke and the sucker has sunken 4 times completely under water the whole engine and its the sand to prove it inside the coweling also

[@Tylnorton]

@@edwardabrahamiii3742 Yeah so definitely change oil when you're done using it for the season. You CAN do it do it in spring but I recommend you to change your gear oil in the fall because any water that gets in the gear housing can freeze and ruin the gears in winter.

[@edwardabrahamiii3742]

@@Tylnorton yea that sounds good cuz the next spring id be able to just push it in the water and start it and go

[@VS-ci6tj]

Great video, how the heck did you get that fourth spark plug out? I really struggle with this design from Mercury can't seem to find the right tool to get at it.

[@1hovermale]

Did you ever figure out a good way?

[@antoinephillips]

For me (no prior experience) I was able to get it pretty easily using the spark plug socket, a small extender, and then the drive socket wrench. I added each incrementally after first placing the socket over the spark plug, feeling for the position with my hand, then adding the extender, then attaching the drive socket wrench to fit it all in. Worked pretty well. My Mercury 115hp is running great now! completely cleared up hesitation I was getting with old plugs (last changed 3 years ago)

[@bms2550]

@@antoinephillips I’m STILL struggling with removing #4 spark-plug… 🤬 I have a 2021 Mercury 115hp. Can you make a KZbin video???

[@kaiseraircraftindustriesin7626]

I'm a little late to this thread, but most spark plug sockets have the hex flats on them for a reason; so you can use a simple open or closed in wrench when in tight spaces without needing a socket wrench.

[@ronaldliboy1243]

at how many hours of used I have to replace the oil filter and change the filter?

[@MrCutLawnCare]

Change the oil and the oil filter every 100hrs and fuel filter every 100hrs

[@masterbaric]

There is no water impeller on a 4 stroke?

[@antoinephillips]

There is, but the manual states it should be changed by an authorized dealer. At 300 hours it states the high-pressure fuel filter should also be changed. This video seems to be focused on DIY tasks

[@Urbas2009]

Please tell me which candles must be standing on a boat motor Mariner 40 ELPT 45, 1998 year, 4 stroke, 4 cylinder, carbureted. Older model, can't find information...

[@MrAmerican]

what channel is this on

[@jforu33]

25-40 oil?? Manual calls for 10-30.. 8mm plug gap?? Seems a bit much

[@athaothao2880]

nice boat mercury outboard tunedup

[@РамзанЖамалдаев-в1ж]

Hi guys. Do you need an assistant?

[@mattharper588]

Warm the motor up before changing oil and gear lube

[@morrisonsmarineandsmalleng3392]

This looks like the classroom in Milton Ontario at mercury school

[@rickfascinato5758]

I have a quick question hopefully you can help me. While performing an oil change on my 150 4-stroke recently I accidentally poured a small piece of the foil seal from the oil jug into my oil fill is this something I should be concerned about? Thanks in advance

[@hulkhuggett]

@@rickfascinato5758 did you ever figure this out? I'm assuming an engine flush should work.

[@rickfascinato5758]

@@hulkhuggett i just Drained the oil changed the filter again... Never did find that little piece of foil

[@gvanhove]

@@rickfascinato5758 Most likely the oil filter did it's job.

[@arthurtaddei1285]

Dont repair it, Kick it off the transom and put a real outboard on it , A two stroke

[@Kyle-bb9zp]

Yep buy a two stroke outboard best ever people have gotten sucked in with this 4 stroke crap.

[@hgherb]

Don’t buy mercury motor they suck..👎👎