For all concerned, Donna's surgery yesterday went fine, she will be
coming home today, and thanks to all of you for your kind thoughts. Now
she wants to go boating!
By the way, we had an interesting problem with the nordhavn that seems
to be solved now, but is still puzzling: Coming back from Long Beach
trawler fest, the engine started surging after 2-1/2 hours of running on
the starboard tank, and eventually died, showing high vacuum on the
Racor gauge. Switching filters did nothing. Switching to the port tank
solved it. Over the next several weeks, the same thing happened six more
times; after 2-3 hours of running, vacuum would start to build from near
0 to 1, then 2 then 5 then 10, 15, (in of hg) and after about 20
minutes, the engine would die. It wasn't a hard blockage, because
switching off the tank feed causes the vacuum to reach that level in
less than a minute. Each time, the only cure was switching to the other
tank. Sounds like vents, doesn't it? we checked the vents, replaced all
hoses, changed filters, etc., still had the problem after 2-3 hours of
running. All the PAE techs, and even Jim Leishman himself took a crack
at the problem with no success. Finally replaced the entire dual racor
filter assembly, since it was the last thing in the fuel system
remaining untouched, and the problem seems to have gone away, though
dissection of the old filter assembly revealed nothing. We are
mystified. By the way, these are bottom feed tanks, not dip tube feed.
Russ
For all concerned, Donna's surgery yesterday went fine, she will be
coming home today, and thanks to all of you for your kind thoughts. Now
she wants to go boating!
By the way, we had an interesting problem with the nordhavn that seems
to be solved now, but is still puzzling: Coming back from Long Beach
trawler fest, the engine started surging after 2-1/2 hours of running on
the starboard tank, and eventually died, showing high vacuum on the
Racor gauge. Switching filters did nothing. Switching to the port tank
solved it. Over the next several weeks, the same thing happened six more
times; after 2-3 hours of running, vacuum would start to build from near
0 to 1, then 2 then 5 then 10, 15, (in of hg) and after about 20
minutes, the engine would die. It wasn't a hard blockage, because
switching off the tank feed causes the vacuum to reach that level in
less than a minute. Each time, the only cure was switching to the other
tank. Sounds like vents, doesn't it? we checked the vents, replaced all
hoses, changed filters, etc., still had the problem after 2-3 hours of
running. All the PAE techs, and even Jim Leishman himself took a crack
at the problem with no success. Finally replaced the entire dual racor
filter assembly, since it was the last thing in the fuel system
remaining untouched, and the problem seems to have gone away, though
dissection of the old filter assembly revealed nothing. We are
mystified. By the way, these are bottom feed tanks, not dip tube feed.
Russ
