15hp Mercury ( Mariner ) valve clearances ?

[Craig Mitchell]

I intend checking & adjusting the valve clearences on my 2003 engine. I have only ever done this job on single cylinder four stroke motorbikes. If anyone could give me the clearances, techniques and tips I would be appreciative.

thanks, Craig ( Scotland )

 

[DHPMARINE]

Re: 15hp Mercury ( Mariner ) valve clearances ?

I don't have the manual here,but have you looked at all the decals one the motor ? Many Mercs have the specs on them.

DHP

 

[Don S]

Re: 15hp Mercury ( Mariner ) valve clearances ?

Best tip I could give is to get a service manual for your motor. There is a lot more going on with it than just the valve adjustments that you will need to know sooner or later.
The manual is nothing more than another tool in your tool box. The Merc part number is 90-856159R02 Dated SEPTEMBER 2002

Here is a section from it.

Valve Clearance (Cold)
Intake 0.15 - 0.25 mm (0.006 - 0.010 in. )
Exhaust 0.20 - 0.30 mm (0.008 - 0.012 in. )

Perform the following adjustment steps:
• Turn the driven gear and align the 1 or X mark on the driven gear with the X mark
on the cylinder block.
• Adjust the intake and exhaust valve clearance for cylinder #1.
• Turn the driven gear 180° (crank shaft 360°) and align the 2 or X mark on the
driven gear with the X on the cylinder block.
• Adjust the intake and exhaust valve clearance for cylinder #2.

Note: In the above instructions, the X is actually a triangular mark on the pulleys shown in the picture.

 

[Craig Mitchell]

Re: 15hp Mercury ( Mariner ) valve clearances ?

Thanks for that, I will check out manual.