Yamaha 9.9 Head Gasket replacement

Above you see the valves and ends of the spark plugs, below we have the top of the two pistons. The area Bram is pointing out with a screwdriver is one of the sections that was clogged.

After isolating the cooling problem somewhere into the head, it was time to go in and plan on finding some problem with the head gasket. In the passageway of the head where the water exits, there were heavy salt deposits -- soo much so that one of the passages was completely blocked solid, and the other one was also pretty clogged. We think(hope) that was the problem. It looks like that could have been caused by the head gasket being previously 'repaired' instead of completely replaced.

Inland - by Edna St. Vincent Millay

Inland

People that build their houses inland,
People that buy a plot of ground
Shaped like a house, and build a house there,
Far from the sea-board, far from the sound

Of water sucking the hollow ledges,
Tons of water striking the shore,—
What do they long for, as I long for
One salt smell of the sea once more?

People the waves have not awakened,
Spanking the boats at the harbour's head,
What do they long for, as I long for,—
Starting up in my inland bed,

Beating the narrow walls, and finding
Neither a window nor a door,
Screaming to God for death by drowning,—
One salt taste of the sea once more?

By Edna St. Vincent Millay

Yamaha Outboard 1993 T9.9ELHR - Water Pump Repair (Impeller)

Picked up Yamaha part 682-W0078-01-00 (WATER PUMP REPAIR KIT) from Boats.net.



Planning to replace the impeller(#21) and surrounding gaskets and seals. The kit included the parts below.

UPDATE: Replacement was not too difficult, loosening the nut which connected to the shifting mechanism was the most difficult aspect. After taking the lower unit off, all of the parts below were replaced. This project was done because its something you should do every few years, but also water was not being pumped through the engine and therefore not cooling the engine properly.

Unfortunately, it looks like there may be a problem somewhere in the head unit, so further investigation is now required.

#18 682-44365-00-00
DAMPER, WATER SEAL

#19 97395-06040-00
BOLT

#20 682-44322-00-00
INSERT, CARTRIDGE

#21 682-44352-01-00
IMPELLER

#22 682-44315-A0-00
GASKET, WATER PUMP

#23 682-44323-00-00
OUTER PLATE, CARTRIDGE

#24 90280-03024-00
KEY, WOODRUFF