Yanmar 2GM Oil pipe replacement

I've been chasing slow oil leak from rear of the engine. I've replaced that valve cover gasket and the lift pump. My next try is to replace the oil pipe that supplies the rocker arms.
It is shown here:

As you can see three types of copper gaskets are used. One 8mm gasket is thicker and goes against the head, P/N 104884-59170. The other 8 mm gasket is P/N 23414-08000. The two 10 mm gaskets are P/N 23414-10000.  The oil pipe is P/N 128270-39200 along with a new tie down clamp P/N 124450-39420. The parts cost was about $40.

The starter did have to come out to get the new oil pipe installed. The oil pipe routes behind the starter near the engine block. time will tell.

I removed the chain plates earlier this week and had new ones made up by Grant's Marine Service. Grant re-purposed the old chain plates into backing plates as the plastic ones showed signs of crushing. Total parts costs were $222 plus new bolts ($60 ) and new 1/2" pins for the turnbuckles ($30).

Here are the new and re-purposed parts:

Thankfully the balsa core was dry at the chain plate holes. They were sealed with penetrating epoxy. The bulkhead was also in good shape with no rot. I'll be sealing the chain plate holes with "thru the roof" caulking from Ace Hardware.

I also replaced all the cooling system hose clamps with the closed variety. After adjusting the valves I have a slow oil leak from the valve cover. Will try that again.

Engine Cooling Adventures

I was seeing some milky exhaust discharge at engine start up so I had the exhaust elbow cleaned out. It seems better. After chasing slow loss of antifreeze from the FWC we found the 35 year old Yanmar "fresh water" pump needs replacement. It is an eye watering $500 with tax and is on order.  I will also torque the cylinder head nuts and adjust the valves.

The next major project is to take the chain plates apart and probably replace them. They have never been inspected in 35 years so it is way overdue. One of the J/30s at our club had to have its bulkhead substantially rebuilt after an inspection.