Tohatsu 40hp and 50hp 4 stroke full service

In this video, I go over how to service a 40 and 50-hp Tohatsu. This includes changing the oil, oil filter, lower unit gear oil, fuel filter, spark plugs, removing the prop, and replacing the impeller.
Instagram: buck_creek
Note: Many of these parts/service items are offsets to genuine Tohatsu parts. Use them at your own discretion!!
Instagram: buck_creek
As an Amazon Associate, I may receive a small commission from any items purchased from the links below.
Check out everything in one place here: www.amazon.com...
Engine oil (Tohatsu pt no. 33282-3080M) - amzn.to/3DYjNKR
Oil filter wrench (Tohatsu pt no. 3AC-99090-0) - amzn.to/3DX5Z3e
Oil filter (Tohatsu pt no. 3R0076150M) - amzn.to/3UMLD2P
Gear lube (oil) for the lower unit (Tohatsu pt no. 33282-3100M) - amzn.to/3riaXzS
Additional (Gear lube pump) - amzn.to/3BQ9sOz
Spark plug (Tohatsu part no. 9701-1-1121) www.ngk.com/ng...
Power trim/tilt fluid (Dexron III) - amzn.to/3StGj2i
Fuel filter (Tohatsu part no. 3B7-02234-0) - amzn.to/3ChDGeN
Water pump impeller (Tohatsu part no. 3C8-65021-2) - amzn.to/3rdv9Dm
2-4-C Marine grease - amzn.to/3B7iBCL
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Additional tools for service
Digital torque adapter 3/8” - amzn.to/3Y3SiXN
Oil drain pan - amzn.to/3HdIxjL
Rubber mallet - amzn.to/3F51FOq
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Torque specs and additional info
Engine oil with oil filter change (without oil filter change) - 2400ml roughly 2.5 quarts (2200mL roughly 2.3 quarts)
Engine oil drain plug - 17 ft-lb
Oil filter - 13 ft-lb
Gear oil - roughly 500ml or roughly 1/2 a quart
Spark plug - 13.3 ft-lb
Bolts holding lower unit to upper limit 38-45 ft-lb (not given in the manual this is rather a general spec for the industry)

[@Stephen-dn6qq]

Hi, I'm watching this from Australia. I have a Tohatsu MFS50A and love it. It is my second Tohatsu, I believe I'm bound to get my services done by a Tohatsu dealer to maintain warranty, but this looks as easy as servicing my two stroke, so I'll probably do my own servicing in future. Thanks for posting and reaffirming my thoughts on servicing. really appreciate the links too, much appreciated. Cheers from Down Under!

[@BuckcreekTV]

Glad I could be of service and that it was helpful. Thank you for leaving a comment and watching!

[@jasondraughon8825]

I can’t help but notice, it looks like the drive shaft would need to be turned clockwise, not counter clockwise to get the impeller blades to sit in the orientation they were in when you pulled the pump housing off.

[@slavenstipkovic9782]

Exactly!

[@hotttt28]

Love the video ,just a little suggestion on your spark plugs a little dab of anti seize would be most helpful.

[@BuckcreekTV]

@@hotttt28 you are absolutely right, I keep a small bottle in my tool bag now. It's almost as good to have with me as WD-40

[@ragman2323]

What I like about your videos is that your a good speaker! Nice boat! pWP

[@BuckcreekTV]

Thank you!!

[@lowcountrytobackcountryins3049]

Fantastic video! I have a 40 on my skiff and have done oil and gear case lube change. The rest looked easy too. You're right parts are a pain to find. I have no dealers near me either.

[@BuckcreekTV]

Glad to be of service!! This was the first time I changed any of the fluids out on mine since I bought it used and honestly it would’ve taken me probably about three hours to do everything if I didn’t have a stripped lower unit drain bolt that supposedly a qualified mechanic did previously.

[@hotttt28]

Nobody works on your motor like you will !

[@austinadduci5204]

Great video man. Next do one on the fuel pump.

[@kennyhollidayjr5206]

Thanks, I have a 60 on my 14' skiff. Good video!

[@BuckcreekTV]

Thank you!

[@justifiedfan98]

thanks for the walkthrough. Good vid!

[@BuckcreekTV]

No problem!

[@qwertyuio7603]

Excellent video, many thanks........

[@rednwhite67]

Fantastic video. Hopefully, our tohatsu 50 arrives this spring. You earned yourself a sub ! How do you like your outboard?

[@BuckcreekTV]

Thank you for watching and subscribing! I hope it will be helpful for you with your new purchase congrats! I have a few thoughts on mine after owning it. Pros: It is light, reliable, has excellent driving ergonomics, is as fuel efficient as other outboards I have had this size, and with regards to the maintenance; The simpliq technology really has the end user in mind and made everything very easy to get to for self-maintenance. Cons: I should note that this is my experience and may differ from others, service centers are few and far in between (the one in my area closed 2 months after I purchased mine so I am SOL :/, I've had other outboards (in this case Mercury and Honda) which seems to have a bit more durable coating for the engine cowling, Simple Tohatsu service parts are EXPENSIVE and frankly a nightmare to find as discussed in the video. Even after calling corporate they essentially said best of luck. (Hopefully, the list I made will help others find/get their parts much easier and quicker.) Mercury's maintenance kits are much easier to obtain and at a reasonable price which is a huge plus. I couldn't reset my maintenance variable following the service using my owner's manual (this could just be me). Finally, I HATE the drag system for the steering I have had others that seem better designed and last longer. The friction disc wares down and doesn't provide any use after a few years. The only place I've been able to find this simple friction disk is boats . com and its not available for 3-6 months. Am I overall pleased with my Tohatsu absolutely! Would I consider another brand? Yes mainly due to parts availability, number of dealers, and amount of good reliable outboards produced by many companies out there. (Honda, Suzuki, Mercury, Yamaha, Tohatsu, etc.) Hopefully this is helpful info! - Buck Creek TV

[@rednwhite67]

@@BuckcreekTV Thank you for the in depth reply. I believe I will have an easier time sourcing parts as my dealer has been up and running since the 80s. And if they shut down, there is another dealer within 100 miles. I do agree with pricing of the honda suzuki merc parts. We had a merc for years and loved it. The big reason we chose Tohatsu was the variable rpm. We are going to use the 50hp for trolling at 650 rpm. The other brands do not offer this feature and I would need a kicker motor with the other brands to troll. I'm new to the outboard world, so i don't quite understand what you mean by ''friction disks''. Thank you for the video and the part links! cheers

[@joem8875]

I don’t think you mentioned service intervals. Is there an hour meter on this motor? What’s tohatsu service interval on all these items? Great videos! Really enjoyable presentation and info. Thanks!!!

[@BuckcreekTV]

Glad you enjoyed it and found it. Tohatsu's service manual isn't extremely helpful with service intervals although it is available on page 63 of the service manual. In essence they recommend checking fluids prop, and filter(s) every 50 hours, change fluids every 100 hours and then check everything and replace any worn items such as the impeller and oil filter at 200 hours. Instead I separated it into 100 and 300 hour service intervals like most other manufacturers. In essence fluids and checks every 100 hours and everything in this video at 300 hours

[@emiliolandaverde72]

How do reset the ligth’s motorboard?

[@rhettcampbell5173]

What about replacing the thermostat? Dont you need to do that regularly? Or at least check it? It is a good vid. Many thanks

[@BuckcreekTV]

Tohatsu doesn't have a service interval on it. It wouldn't hurt to check but it doesn't have to be replaced regularly.

[@SouthernStyleLawnCare]

How High or low did you have to mount on your transom? I'm about to mount a 50hp tomorrow on a 1754 grizzly and was curious. Did you run plat level with bottom, higher or lower?

[@BuckcreekTV]

With a 20 in. shaft I put it on the bottom hole on my 1548 I.e. as low as it can go. I may be able to move it up one hole since I have the hydrofoil as well

[@sashia847]

Nice

[@Mrgoogle642]

Thanks for the great video! I have the same engine and i wonder what kind of prop are using and do you recommend a steel prop?

[@Mrgoogle642]

I have found your other video regarding the prop!

[@BuckcreekTV]

Awesome glad you enjoyed!

[@chriscollums3883]

Which hydrofoil is that? TIA

[@BuckcreekTV]

I had to go look at it it is a circle s hydrofoil

[@gunsandrotors8704]

Defender marine carries stock tohatsu parts. Quicksilver is mercury oil just renamed. Mercury oil can only be sold at mercury dealers. Quicksilver can be sold any where. I love that 40! I cant buy one do to restricted HP lakes l fish.😔

[@BuckcreekTV]

Darn restricted hp lakes! It's been a good reliable engine (knock on wood) I appreciate the info on spare parts!

[@lmb25315]

Is that cavitation plate on there as a hydrofoil or is that to help keep water pumping into the water pump in shallow water?

[@BuckcreekTV]

It is a hydrofoil

[@salta5859]

You don t hear the contact slarm...???!!!

[@cliffhalljr3426]

Did you replace your O-Ring for the oil change ( part 3T5100460)?

[@BuckcreekTV]

I did not in the video, I left the part at another location but yes it should be done with each oil change I did buy a pack of 10 of them since they are cheap.

[@cliffhalljr3426]

@@BuckcreekTV I gotcha. Are they for the oil plug or lower unit oil plugs?

[@BuckcreekTV]

@@cliffhalljr3426 I had a hard time finding that particular part number. The lower unit oil gasket is part number 332-60006-1 and the oil drain gasket is part number 3R3074060. Fortunatley the gaskets/washers are pretty universal so it does not have to be that specific part

[@cliffhalljr3426]

@@BuckcreekTV I gotcha. I just helped my buddy do his maintenance and we have no idea where the o rings are supposed to go lol. I appreciate your reply and this thorough video. It was very helpful!

[@BuckcreekTV]

No problem! I re-used my crush washer. You can re use it a couple of times as long as it's not over tightened.

[@tstoute82]

Do you think that hydrofoil does you any good?

[@BuckcreekTV]

It certainly helps to get on plane and reduce proposing

[@flatbit3090]

Surly its turn the shaft clockwise just checking

[@flatbit3090]

And the water pump housing put back 180 degrees out i don't know if that would make a difference

[@BuckcreekTV]

I believe counterclockwise or at least I haven't had any problems and I have put 30-40 hours on the motor since the service.

[@flatbit3090]

@@BuckcreekTV Great video it takes time and effort to put it on here well done

[@BuckcreekTV]

I appreciate it thank you!

[@wmkess]

@@BuckcreekTVsince you lubed it I doubt it matters if they are started backwards. You can verify the motors rotation direction by looking at the timing marks on the flywheel if you can see them. If it rotators clockwise the ATDC marks (usually 0-10deg) are to the right of TDC and the BTDC marks (0-30 or deg) are to the left.