, 1985 manufacture.
Hours around 2280 total.
Indications from meticulous records and other items of prior owners is that it was well cared for, regularly serviced and run intelligently for most of its life.
There was a 15 month owner who bought and held the boat just before us (prior owners were original), didn't do much sailing but motored around a lot looks like 300 hours or so!. He paid a mechanic
for "routine service
About 100 hours ago, at 2180, prepping for a big trip, we had a reputable mechanic
do a bunch of stuff that the manuals
and records indicated it was time for:
- new heat exchanger
(old one was shot)
- one new and two rebuilt injectors (they all failed miserably on the bench, bad spray, wrong opening pressure, afterdrip)
- valve clearances set - they weren't far off, he said.
- timing and idle set
- compressions checked -- rear/lowest cylinder was only marginal, probably got water
sucked into it with 15 month owner doing some cranking on low batteries.....compressions are 425/405/370.....
- glow plugs checked and excellent
at max checked and was okay.
When all this work was done, the sooty oil
problem I describe below was present, but the sooty transom was not.
So, now 100 hours later......
still starts up immediately and runs like a champ
- black sooty floating stuff that smells like sooty diesel
comes out and floats on the water
at start, then stops
- motoring for an hour or so gets the transom somewhat black, and when you hose it off, you get a diesel
sheen on the water. The transom soot is enough to make the boat need scrubbing after each few hours of motor
- little to no oil consumption
- oil turns very black and sooty after only a few hours of running, even after doing a few rounds of changing it each few hours to see if we could get the sootiness out.
- engine no longer reaching full rpm
despite totally clean prop.
My diagnosis is that the compression
in that back cylinder is getting worse, the engine cannot make full power b/c of it, the fuel
in the other cylinders is too rich b/c of the lagging cylinder, and now that the injectors are properly set, the right amount of fuel
is being put in them.....and the oil is sooting b/c of blow by on the piston rings in the bad cylinder.
Question is -- engine still running well and making enough power for what we do --- but, if going to head
off across the Pacific, is this a nagging problem that can go on for a long while, or.......are the oil passages in the engine quickly clogging and I'll have some kind of main bearing failure and I am an idiot to not mortgage something to pay for a repower
Despite the dire description, the thing starts like a champ and runs quite smoothly. IT is just the sooty oil and sooty transom that has my attention, and wondering how long it has to live.
Opinions? (Local reputable mech says to let it go til it dies, but it would be rather inconvenient if that happened in, say, Tonga