Mariner/Yamaha 2HP 2 stroke - parts

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eddystone

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Inside the gearbox of above outboard there is a circlip that goes round a cog - which is now somewhere on my lawn having sprung off at unknown trajectory and velocity. Trouble is I don't know the size or where I might get hold of a replacement. Any ideas?.
 
eddystone said:
Inside the gearbox of above outboard there is a circlip that goes round a cog - which is now somewhere on my lawn having sprung off at unknown trajectory and velocity. Trouble is I don't know the size or where I might get hold of a replacement. Any ideas?.
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Identify your engine precisely . HP year and serial number

Go to the parts lists at at Boats.net: Outboard Motors, OEM Marine Parts, Boats for Sale for Mercury ( and Mariner ) find the parts lists for your engine, go to the gearcase diagram and identify the part you need
With luck it will be an available part, but if yours is an old rebadged Yamaha I dont think it will be

Then contact Oakley Marine ( aka Outboards -Direct) :: OutBoards-Direct ::. They are agents for both Mariner and Yamaha
Fill in the online enquiry form and wait for a return phone call

I dont know what circlip you are talking about ......... the one on the end of the drive shaft that holds the pinion gear on ?

You may have to take the bits to a local engineering supplies place and find something to fit
 
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VicS said:
Identify your engine precisely . HP year and serial number

Go to the parts lists at at Boats.net: Outboard Motors, OEM Marine Parts, Boats for Sale for Mercury ( and Mariner ) find the parts lists for your engine, go to the gearcase diagram and identify the part you need
With luck it will be an available part, but if yours is an old rebadged Yamaha I dont think it will be

Then contact Oakley Marine ( aka Outboards -Direct) :: OutBoards-Direct ::. They are agents for both Mariner and Yamaha
Fill in the online enquiry form and wait for a return phone call

I dont know what circlip you are talking about ......... the one on the end of the drive shaft that holds the pinion gear on ?

You may have to take the bits to a local engineering supplies place and find something to fit
Click to expand...
Yes that’s the one - there is only one circlip in the gearbox; I found an exploded diagram on a Dutch site and have a Yamaha part no. so I’ll try Oakley
 
I have found both Mariner and Yamaha parts numbers although following up VicS's links the Mariner part number is unavailable but the Yamaha is. The plate on the OB only has 2M for model and therefore can't identify date - Yamaha seemed to give each year of manufacture a different 2 digit suffix. The part number changes in 1998 but suspect the part itself is identical.
It is possible to buy assorted sizes of E-clips from Amazon, Machine Mart etc but these are stainless rather than carbon steel - would that affect g/box operation?
 
eddystone said:
I have found both Mariner and Yamaha parts numbers although following up VicS's links the Mariner part number is unavailable but the Yamaha is. The plate on the OB only has 2M for model and therefore can't identify date - Yamaha seemed to give each year of manufacture a different 2 digit suffix. The part number changes in 1998 but suspect the part itself is identical.
It is possible to buy assorted sizes of E-clips from Amazon, Machine Mart etc but these are stainless rather than carbon steel - would that affect g/box operation?
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It should be possible to find the date from the serial number. See Brunswick Marine in EMEA Download Center - Download Center
 
Further forensic searches of the lawn turned up said item but it’s academic as the cog/wheel refuses to come off the drive shaft meaning I can’t get at water pump housing.
 
eddystone said:
Further forensic searches of the lawn turned up said item but it’s academic as the cog/wheel refuses to come off the drive shaft meaning I can’t get at water pump housing.
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You cannot just take the pinion off you have to withdraw the shaft leaving the pinion behind.

I cannot access the workshop manual at the moment but IIRC overall the job is to remove the lower unit complete with drive shaft.
open up the gearcase and remove the circlip ( being careful that it does not escape!)
unbolt the water pump housing cover
Now withdraw the shaft c/w the impeller, upper plate and pump cover
Remove the impeller drive pin and slide the impeller off the bottom end of the shaft.

While you have it in bits replace both drive shaft seals , especially the one below the pump, and the prop shaft seal
 
VicS said:
You cannot just take the pinion off you have to withdraw the shaft leaving the pinion behind.

I cannot access the workshop manual at the moment but IIRC overall the job is to remove the lower unit complete with drive shaft.
open up the gearcase and remove the circlip ( being careful that it does not escape!)
unbolt the water pump housing cover
Now withdraw the shaft c/w the impeller, upper plate and pump cover
Remove the impeller drive pin and slide the impeller off the bottom end of the shaft.

While you have it in bits replace both drive shaft seals , especially the one below the pump, and the prop shaft seal
Click to expand...
On the early ones the pump is behind the prop. So is already off. I did the same as the OP when I rebuilt my Mariner the other week. If he is doing the same as me, tsking the circlip off in the mistaken belief that this is what is stopping it coming apart, he is, as I was, mistaken. The reason it wont come apart is that the drive shaft/ shaft tube/ waterpump feed pipe is seized/stuck in the shafts and seals and will probably end up breaking as mine did!
 
VicS said:
Its a 1988 model See # 10
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"open up the gearcase and remove the circlip ( being careful that it does not escape!)
unbolt the water pump housing cover"
My point is it doesnt make sense. The water pump cover comes off first to reveal the gearbox and the pinions and the circlip
 
Beneteau381 said:
My point is it doesnt make sense. The water pump cover comes off first to reveal the gearbox and the pinions and the circlip
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My point is that a 1988 model has the water pump on top of the gearcase , driven by the vertical drive shaft. Its not behind the prop on the prop shaft

Its an awkward one because you cannot just drop the gear case,unbolt the pump cover and slide it and the impeller up the shaft. The shaft has to be withdrawn so that the impeller can be slid off the bottom and that means removing the circlip to release the shaft
 
Problem is I can't withdraw the drive shaft from the gearcase or separate out water pump housing; I removed the head and the drive coming out of the bottom turns when I pull the starter cord so that's not seized. I suspect the drive shaft is seized in the leg and its jamming everything together - have another try this morning.
 
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