thanks,Eric. both oil level and colour are fine.Ian
From: eric <firstname.lastname@example.org>
Subject: [Amel Yacht Owners] Coolant loss in Volvo
Date: Sat, 09 Dec 2006 19:36:14 -0500
Has your crank case oil level gone up?
If it hasn't I guess you did have an airlock (probably in the water heater-
[mailto:email@example.com] On Behalf Of Ian & Judy Jenkins
Sent: Sunday, December 10, 2006 7:21 PM
Subject: [spam] [Amel Yacht Owners] Coolant loss in Volvo
We have just had a curious experience with our coolant levels. Our engine is
6 years old with about 2,000 hours. Very reliable. Last May I drained all
the coolant and filled up with fresh antifreeze, carefully following the
instructions to open the bleed nut till the coolant overflowed it etc.The
boat was then ashore till November. The coolant level remained the same.( In
my experience the coolant has never needed topping up ).
When we first used the boat this November I found thtat after about 12 hours
it needed almost a litre of coolant to be added to bring it up to the
correct level. As there was no evidence at all of a leak I surmised that
there might have been an airlock. However, this happened again about 12
hours later, though to a lesser extent ( maybe one third of a litre). Since
then we have run for about 20 hours ( mainly at low revs but also flat out
for about 30 minutes) and have suffered no losss at all.
A Volvo mechanic I spoke to in the UK told me that it was probably one of
the O rings that was`allowing the coolant to escape into the exhaust water,
hence no trace in the engine room.Try as I may to read the exploded diagram
in the parts manual and the workshop manual to fit his diagnosis I cant see
how a perished O ring would allow what he claims.From what I can see, if an
O ring went , either coolant or sea water would appear on or under the
engine, but they wouldnt mix.
My view is that the engine probably did have an airlock when I refilled
with fresh coolant and that this took a couple of goes to work its way out
of the system. My Nordahavn friend, who has a Lugger engine , tells me that
he has had a very similar experience, having to top up three times after a
change of coolant.
I would be interested to hear if anyone else has had a similar experience.
Cheers, Ian and Judy, Pen Azen, SM 302, Mar del Plata, Argentina
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