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- เผยแพร่เมื่อ 18 มี.ค. 2023
- A full guide on a 300 hour service of a 115 mercury 4 stroke. The 300 hour service differs from the 100 hour service in two ways. In addition to a 100 service, the 300 hour service also includes the replacement of the water pump and spark plugs. I have a separate video that shows the replacement of the water pump, so be sure to check it out.
If you enjoyed the video or found it informational please consider, Liking, Commenting, and subscribing and I will try my best to answer any questions.
Link to Water Pump Replacement-
• Mercury 75-115 Water P... - ยานยนต์และพาหนะ
What happened at 28:23? Didn't show the impeller replacement.
very explanatory video!! thanks!!
That boat looked pretty clean for 300 hours. Owner must be keeping it off the bottom. Great dealer support.
I liked the tip on anti-seize on the plug thread. I would also add dielectric silicone grease on the tip of plug where the cable attached to help keep rust and corrosion (especially in salt water).
Great point!
Great video ! I would have loved to see you change out the water pump though. Do you have another video for that?
Thank you for a great video. I think I must have missed it. Did you show how you serviced the lower unit? oopps I guess I should have looked in the description. Thank you
Appreciate the info and tips. Ever tried pumping the oil on an older engine? I have a 2012 and tried it same way though the dipstick hole and only got a few ounces. Thanks!
I was hoping to see how you open the thermostat? Hopefully you make a video on it
The thermostat is super easy to check on these motors. its two 10mm (i believe) bolts and it pops right off, but i will for sure make a video on it!
Thanks for sharing! I have a question about the latch to get the cowling off. it will not release the latch inside and im afraid im going to brake something if i keep pulling on it.
Why is everyone skipping the High pressure fuel filter?? Pretty important
Did you change the impeller?
When do you recommend changing the thermostat? Do you have a video for a thermostat for the 115?
GR8 video!!! We have a 2021 Mercury 115hp and we’re having a problem with it bogging down while running-it… ANY SUGGESTIONS???
My first guess would either be plugs or you have a fuel problem (old fuel/water in fuel)
Would it hurt anything to run the Mercury 25w-40 weight in the 90hp CT?
very good video.During 300 hrs maintenance you should change also the thermostat and the zinc anodes?Am i correct?
The thermostat and anodes should be inspected every 100 hours. As long as there is no damage or major decay to the thermostat or anodes they should be fine.
to take the prop nut off, is it 1 1/16 or 11/16? i thought i heard 11/16 but on someone else's video, i heard 1 1/16. I'm currently watching multiple videos so I can do my own service.
Great video but the part I needed most was getting the lower end back on. It seemed you were going to line up the shifter with a screw driver but saw it was lined up. ??? Was the third guy moving the shifter in the boat while you were lifting the lower end? ??? I replaced my impeller east enough but curious why you didn't show it? Did you replace the oil seal carrier? My 300 hr kit came with one. How do you know if it needs replaced? Thanks
I found the impeller replacement in a separate video. Good job. Still need more info on getting the unit reassembled. Thanks
Hey there! The kit does come with a new seal which can be replaced but not exactly necessary. You’ll know it’s time to replace it if you see gear lube leaking from around it. Getting the lower unit back on is a task in itself so I just cut out the majority of it to keep the length of the video down. I plan on making a video on doing just that. The main thing about getting them back on is to spline up the driveshaft. You can do that by spinning the driveshaft or the flywheel until it seats.
@@ajmcneil3147 Thanks. I was able to get it back together yesterday. Whew! I'd get it together but didn't have full use of helm shifter. Through some trial and error and slowly moving helm shifter an 1/8" at a time, I finally got it with all gear positions working. I'd position The shifting shaft where I thought Forward or Neutral or Reverse was and put the helm shifter accordingly but realized it was moving ever so slightly when I'd lift the lower unit up. I'll watch for your video.
Hello, I looked at a Godfrey pontoon today with a 2016 Mercury 115 mounted on it. Has 238 hours on it. I had them remove the top engine cover. I noticed oil sitting all around in the front of the engine to the right of the oil filter. Is there something in that area that's prone for oil to leak? I'm looking for suggestions before I would go to purchase. Thanks.
Sorry for the late reply but from my experience when changing the oil filter, it can get a little messy. Now the oil filter has a little tray underneath it which is supposed to cath any leftoer oil but it can fill up pretty quickly. Another possibility might be from refilling with oil since the oil cap is on top up by the front of the motor. I have seen where people have spilled oil down the front of the motor.
Question: Where is the flame/spark arrestor for an outboard 115 mercury located at??
The spark/flame arrestor should be located on the front of the intake manifold behind the removable panel.
Do you have a video on inspecting or replacing the thermostat?
Not yet but i currently have a video in the works that will show all about the thermostat.
@ajmcneil3147 looking forward to watching it.
Hi, thanks for doing such a great video , I have a question, Does a 115hp Mercury pro xs have a belt to be replaced on the 300 hours maintenance?
Good question. The 115 pro xs does not have belt that needs to be changed as far as I know. I have only seen a few and had to run to work to check the manual to make sure there wasn’t. The only “belt” on that motor should be the timing chain which does not have a maintenance spec.
A belt only comes into play when you get into the 150s.
I think that’s the reason why they sell the 300 hours maintenance kit without the belt so I was confuse because the mercury Mobil vessel view shows to replace a belt in my motor but I couldn’t find any belt on it , I appreciate your help , thanks again for sharing your knowledge and your videos
There is no belt, it has a stator.
Good video, but why didn't you show the lower unit and the impeller replacement?
I have a separate video posted on that. Was trying to keep the video at a reasonable length!
@@ajmcneil3147 Consider labeling your videos that are covering the same topic as "Part 1" and "Part 2". Thanks for clarifying it though.
Don’t you also need to change the t stat?
The thermostat is a inspect item. So if the thermosat is giving any problems then yes it would need changed, otherwise pull it off and inspect it and if nothings wrong then its good to go!
Consider spending a little time for out-tro / summary.
Looks like I need a couple tools to do the job right on those spark plugs. That fourth one looks like a real B*^#H
Iwas hoping to see you replacing the water pump i wasted my time watching this shit show.
what a worthless video... couldnt show the water pump replacement? wtf
I have a separate video on that. Thanks for the input though!
@@ajmcneil3147 stop making videos
What an idiotic comment. LMAO. Great video AJ!
@@scootnitdowntown look lady, i said what i said. cant help it you are all over his nutz hahaha.. 🤡