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20 HP Mariner What year

C

cdru

New member
"Serial number 653 S 08147. Al

"Serial number 653 S 08147. Also, what spark plugs should be used in this engine? Thanks. cdru"
 
"Carl, 1976 Yamaha built Marin

"Carl, 1976 Yamaha built Mariner.

For plugs you need NGK B6HS plugs gapped at .024

Don't use a Champion cross reference number to that plug. They don't work well in Yami and most Merc motors.

If you can't find NGK's, Autolite would be an acceptable alternative."
 
Thanks for the information. On

Thanks for the information. One other question. How do you tighten the steering on the tiller engines? Thanks. cdru
 
"You are going to make me dig

"You are going to make me dig in a paper manual


Just so I'm clear, the motor is kinda "easy swinging" on the leg and you want to add a bit of tension to that? so it will stay put when you let go of the tiller..."
 
That is correct. Can't let

That is correct. Can't let go of the tiller while trolling or it will swing one way or the other. Also... the serial number was incorrect on the last number. It should be 653 S 08143 not # 7 for the last #. Don't know if it makes a difference or not. Thanks. cdru
 
"Ok, there should be a tension

"Ok, there should be a tension screw that will allow you to tighten it up a bit.

Looking at the motor as if it was hangin' on the boat and you were on-board.

Just under the lower cowl on the right hand side (right up near where the bracket meets the bottom cowl) there should be a screw or hex head type bolt - it screws into a kinda raised round dimple (best way I can think to explain it) - it may be slightly obstructed by the tilt locking mechanism.

It pushes on a little plate inside, which then butts up against a plastic bushing that surronds the pivot that the engine turns on.

You can tighten that up to suit. The bushing inside is prone to breaking over time and are a royal pain to get at and change, so don't reef too hard on the screw - just tighten slightly and only go as much as you need to, to get the "stiffness" you are looking for."
 
Graham. Thank you for all your

Graham. Thank you for all your great information. I really appreciate your response and time. cdru
 
"Good Morning, I've just

"Good Morning, I've just purchased what I believe to be a Shetland 535 boat. The engine is a Mariner 40HP 2 Stroke. Can anyone help with the year and also advise where manuals for the year and model can be obtained. Thanks in advance. The serial number of the engine is 40EO 6E9S 151401"
 
"Raymond, that is a 1990 Yamah

"Raymond, that is a 1990 Yamaha built (for Merc) Mariner known as an oil injected "C" model.

If you are simply looking for an all round maintenance manual, Seloc's produces them for Mariner models.

If you are looking for OEM - owners manual or service manual you will have to check with a Merc dealer. I can not find a (part number) for either, but may still be available through a dealer."
 
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