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22 December 2020, 22:33
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#1
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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Restoring an old Yamaha 6B (2-stroke 6HP, 1980's)
I am restoring an old Yamaha 6B which is a 6HP outboard engine from the 1980's. According to the partslist I found, my engine was build between 1980 and 1981. So its a very old chunk of metal with al lot of wear and tear and a lot of work on it, but I loved it the first time I saw it.
I got it cheap for 150 euro's and I try to keep the restoration as cheap as possible but still do everything necessary to get a good and reliable motor for me and my familie.
First some pictures of how she was when I found her
It looked okay for the age and I was carefully optimistic. But with motors this age there are always some surprises. And surprises i found very soon
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22 December 2020, 22:37
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#2
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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First I took the outboard apart to examine all the parts and soon I found some broken bolds on the inner exhaust cover. When I unbolted the cover I found a lot of dirt and scale on the inside and two very rotten gaskets.
I tried to unscrew the broken bolt-ends with a left-tap but they were to trapped so I had to drill and re-tap them. On one coolingchannel the was a little crack in the metal so I have to repair that.
Some new gaskets
And the crack repair with araldite liquid metal and three layers of thin copper
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26 December 2020, 23:51
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#3
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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Not much interest in this subject I guess?
I leave the block for a while en contineu with the lower tailsstock where I found a bad bearinghousing. When disassembling it broke in two so I had to replace it. Replacement would cost me to much so I tried to 'fix' it
I soldered it with Durafix
The soldering went well
I also made a new bushing for where the oil seals will be placed
And a nice aluminium ring on top
And the result
I will give it a good finish but I can tell this bearing housing will be good for the next season and probably longer
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27 December 2020, 07:50
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#4
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Member
Country: UK - England
Town: Kent
Boat name: ever dry
Make: Elling KB350
Length: 3m +
Engine: Yamaha 15hp 2 stroke
Join Date: Jun 2020
Posts: 619
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Well I am following with interest, quite some impressive work going on there. Thanks for sharing.
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27 December 2020, 08:14
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#5
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,930
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Interested and following
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Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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27 December 2020, 08:38
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#6
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,897
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Good work there.
The hood doesn't look right to me. That generation of engine had a square hood.
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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27 December 2020, 09:35
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#7
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Member
Country: UK - England
Town: Cambridgeshire
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Yam 15 Tohatsu 9.8
Join Date: Nov 2007
Posts: 8,382
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Yep another one looking in and interested, just forgot to add any comment.
Re the hood I think it's deceptive with no logo stickers and looks exactly the shape of the Mariner branded version I bought new in the 80s.
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27 December 2020, 10:25
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#8
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,897
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Quote:
Originally Posted by Fenlander
Yep another one looking in and interested, just forgot to add any comment.
Re the hood I think it's deceptive with no logo stickers and looks exactly the shape of the Mariner branded version I bought new in the 80s.
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I think you are right, I had it in my head he was doing a 5hp then I noticed it was a twin cylinder so hood is indeed correct.
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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27 December 2020, 14:54
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#9
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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Thanks for letting me know you follow my topic. I will continue to post my attempt to make this old engine working and durable again. I must admid it is for me a big challenge as for my dayjob I am a personal health care worker (like a nurse) for people suffering dementia. So it's not something I do normally with all this tools and stuff ....
Kind regards from the Netherlands
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27 December 2020, 17:16
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#10
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Member
Country: UK - Scotland
Town: Kingussie
Boat name: Puffin
Make: NorthCraft / XS
Length: 5m +
Engine: Mariner 60
MMSI: 232019541
Join Date: Mar 2011
Posts: 81
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Following - great thread - thanks for sharing.
Looking forward too seeing the results of your efforts - as I run a similar vintage engine
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02 January 2021, 17:11
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#11
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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I cleaned the lower unit and it's ready for painting
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02 January 2021, 19:20
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#12
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,541
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Good work on the preparation.
Are you planning on using a filler primer on top of the zinc primer?
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Is that with or without VAT?
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02 January 2021, 22:25
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#13
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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Quote:
Originally Posted by spartacus
Good work on the preparation.
Are you planning on using a filler primer on top of the zinc primer?
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I am not sure yet. Its an old outboard so the pitting doesnt really bothering me. On the other hand, it's not really that much more work or money and in the en it looks just better
Do I have to prime first before using filler? I bought some etching primer as a basecoat.
Thanks
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03 January 2021, 10:17
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#14
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,541
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Quote:
Originally Posted by Spreu-boote
Do I have to prime first before using filler? I bought some etching primer as a basecoat.
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Watch this:
You can use an epoxy on the pitting, sand back then use the zinc primer. Any low points use a filler primer. Sand and repeat. As you're using a gloss top coat, then any imperfections will be exaggerated.
I know what you mean about being an old motor, but worth it since you've gone back to bare metal.
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Is that with or without VAT?
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03 January 2021, 12:26
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#15
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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Thats helpfull and good to see what the results may be. I will go for some filler to make it smooth for a better looking paintjob
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03 January 2021, 14:45
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#16
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Member
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 1,410
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Use an epoxy filler or one sold for marine use. Car body type filler absorbs water.
Best to use an etch primer on bare ally before applying primer & colour coats.
If you have a black aerosol then spray a very light dust coat on the primer before sanding.
This is called a guide coat & as you sand you will be able to see any low spots as the black will still be visible. (I use a 3M powder type but the aerosol will serve as well & a LOT cheaper as you're only doing a one-off)
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08 January 2021, 21:48
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#17
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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08 January 2021, 21:51
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#18
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Member
Country: Netherlands
Town: RIJNSBURG
Length: under 3m
Join Date: Jun 2020
Posts: 25
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09 January 2021, 07:55
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#19
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Member
Country: UK - England
Town: Kent
Boat name: ever dry
Make: Elling KB350
Length: 3m +
Engine: Yamaha 15hp 2 stroke
Join Date: Jun 2020
Posts: 619
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A + star for effort. I'm glad you enjoy this sort of thing, top job, personally I would have paid for someone to supply me with a ready made set.
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09 January 2021, 10:20
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#20
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Member
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 1,410
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Very impressed!
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