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Stan & Jeremy:
A Halve Millimeter
I disassembled the diaphragm water pump and associated check valve assembly today to ensure the valves were seating properly. Although the intake valve was seating properly, the discharge valve was not, hence the warm engine. A comparsion of the diameter of the new check valves I installed in March to the old check valves showed the diameter of the new valves are 0.5 mm larger than the old valve set. Because the new valves are larger, the new discharge valve does not seat in the valve recess cut in the check valve body. I also measured an older set of valves which came with the engine parts onboard. As with the old valve set I removed in March, the older valves are 22.5 mm in diameter compared to a diameter of 23 mm for the new valves purchased in March. Bill Miller, Sabb America, is contacting Sabb Norway about this problem. I plan to write a letter to the VP of Sales in Norway. Besides the frustration, I had purchased a new temperature sensor ($$) and ordered a new VDO temperature gauge ($$). Further, Sabb Norway claims the engine should not run warm in tropical waters - right Stan. I discussed this issue with Bill Miller and he confirmed that even new engines run warm in semi-tropical and tropica waters - Uff Da to their claim.
Fair Winds,
Rod
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Rod, I have to admit that having taken my waterpump
apart various times, I have not replaced the original
valves. I think I should have because I know the inlet
valve doesn’t make a good seal as it should.
I ran into a guy who circumnavigated with a Sabb and
he claimed that the valves should be ‘lapped’ to the
valve body to get a perfect seal.
I was surprised when I first saw what they were using
as valves and I suspect Sabb felt they are adequate
for cold water areas, but I think they could stand
better engineering or maybe made with a rubber sealing
surface or something.
Overall, I really can’t fault the engine. I understand
the only Sabb mechanic in America starved to death
from lack of work. As for the type of waterpump, how
can you really fault a pump that is still going strong
that was installed in 1978? Same diaphram even.
Stan of Waxwing
— Rod Bruckdorfer <seagypsy@att.net > wrote:
Stan & Jeremy:
A Halve Millimeter
I disassembled the diaphragm water pump and
associated check valve assembly today to ensure the
valves were seating properly. Although the intake
valve was seating properly, the discharge valve was
not, hence the warm engine. A comparsion of the
diameter of the new check valves I installed in
March to the old check valves showed the diameter of
the new valves are 0.5 mm larger than the old valve
set. Because the new valves are larger, the new
discharge valve does not seat in the valve recess
cut in the check valve body. I also measured an
older set of valves which came with the engine parts
onboard. As with the old valve set I removed in
March, the older valves are 22.5 mm in diameter
compared to a diameter of 23 mm for the new valves
purchased in March. Bill Miller, Sabb America, is
contacting Sabb Norway about this problem. I plan
to write a letter to the VP of Sales in Norway.
Besides the frustration, I had purchased a new
temperature sensor ($$) and ordered a new VDO
temperature gauge ($$). Further, Sabb Norway claims
the engine should not run warm in tropical waters -
right Stan. I discussed this issue with Bill Miller
and he confirmed that even new engines run warm in
semi-tropical and tropica waters - Uff Da to their
claim.Fair Winds,
Rod
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Stan:
I agree with you completely. The Sabb G engines are wonderful work horses that were designed to probably stay in a family of fishermen for three generations. Before, I launched the boat, I changed the oil, adjusted the valves, etc then started the engine while on the hard. The engine started on the first turn after being stored for 2.5 years. After we launched the boat, I ran the engine for 20 to 30 minutes at the dock, another 30 minutes leaving our marina before we set sail and another 20 minutes entering our new marina. After ~1.25 hours of running time, the engine oil is still clear. The water pump still pumped water and kept the engine in the 150 F range even though water on the discharge side of the pump was flowing back to the intake side of the pump. No doubt Sabb engines are well engineered but they need to improve the check valve assembly and offer a larger diaphragm pump for tropical water operation.
IDUNA's engine was installed in 1980 and the boat commissioned in 1983. Peter and Erica Thinnus, her builder, sailed her for one year in Canada. The second owner cruised from California to the Caribbean and up the east coast and back to Florida. Her third owner sailed her from the Boston area to St. Martin and back. The forth owner sailed her in Maine. All these miles with the original engine.
Rod
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Of course on the original engine…it’s a BCC and
rarely do you use an engine. The Sabbs’ ability to lay
about idle for long periods and still jump in when
called on is one of the engines biggest pluses.
(Hmmmm. My mate says I have similar qualities).
It seems to me I heard someplace that you can get a
‘double’ raw water pump assembly. If so, that would be
useful in the warm waters of the tropics.
Stan (Waxwing)
— Rod Bruckdorfer <seagypsy@att.net > wrote:
All these miles with the original engine.
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