Originally Posted by River Runner
Yeah, it fires right up. The big problem was the smoke. It was embarrassing out on the San Francisco
Bay with other boaters pointing at the big black cloud of smoke following us like We we’re clueless. The last straw was when our US flag’s white stripes turned gray!
My 4-108 had 3 stuck valves and 3 bent pushrods.
The previous owner had not repaired a drip of seawater coming from the water
pump and the drip ate a hole in the timing cover, got water in the oil
That's how he left it.
A Couple years later I found the vessel and checked it out.
After pulling the valve cover, I found the valve train had rusted up.
I removed and soaked the rail and all parts in Kero and deemed them able to be used.
Pulled the side cover, inspected for damage, all okay there.
The 3 stuck Valves would not move at first, so I sprayed the all down with Kroil penetrant waited a day or so and lightly tapped on those that were stuck and then they moved down further, still stuck.
I was pleased to find that there are no pre combustion chambers in the 4-108 and was able to "tap" the valve heads using the piston with a rachet on the crank pulley.
Bumping the heads of the valves can be a disaster if on an angle.
These engines have the valve pointing straight down though, so I was able to tap down and bump up till they were working on their own spring pressure to move up.
It worked for me.
You can tap on those valve heads with a dead blow hammer and you'll be able to tell if they are stuck.
are pretty robust engines.
Mine has run perfectly since, it's been 6 years and a couple hundred hrs since.
SV Cloud Duster