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Yearly Maintenance - Cleaning Heat Exchangers

Mar 08 2015 03:21 PM | Island Time in Articles

I've just done my heat exchanger servicing. This is a job that should be done every year or so. If you don't do it, your engine will eventually overheat, and if you have an engine driven fridge, it may not work properly either!

Heat exchangers 101 (skip this bit if you know about them already!)

So, basically a heat exchanger is a series of pipes inside a container. The pipes carry cool fluid (seawater here) through whatever needs to be cooled in the container (Water, Oil, Refrigerant etc). Heat is transferred from the container to the fluid running thru the tubes, exchanging the heat - hence the name of course!

There are a few issues with seawater as a coolant, which, as boaties, we need to be aware of. Firstly, it is corrosive, secondly it can cause electrolysis in dissimilar immersed metals, and third, it carries sea life and salt!

To combat these, your heat exchanger/s and or cooling system is made of durable materials that (hopefully) don't rust away too quickly! Not much you can do about the construction of the system unless you are replacing stuff, and that's beyond the scope of this article.

The second item, electrolysis. To combat this, your system will likely have an anode, especially if the heat exchanger has no electrical connection (other than sea water!) with the main engine. Make sure you check and replace the anode as required - not to do so will lead to premature failure of the heat exchanger. = $$$

The third issue is sea life and salt. Salt deposits and sea life (mostly small shellfish and barnacles) can block the small tubes in the heat exchangers, and slow or even stop the flow of cooling water. This can lead to catastrophic overheating. More $$$! So, yearly checking and cleaning is a good idea.

Remember you may have more than one heat exchanger. I have three - Fridge, oil and engine. Blockage of one or more will reduce the flow of water from your exhaust. Your exhaust discharge should not be hot enough to steam - if it is, the flow may be partially restricted!!

So, here is the cleaning process. Firstly, the units must be identified and removed. Follow the path of the water from your engine through hull. Here is a pic of my engine, showing the raw water (seawater) pump, and the location of the heat exchangers. The Oil H/E is hidden from view, behind the engine H/E and the alternator.
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To help with access, I removed the alternator, here is a pic showing the small oil cooler (H/E) behind the engine H/E
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So, now you must remove the heat exchangers, and take them apart. CAUTION - the fridge one will contain pressurized refrigerant!! Make CERTAIN that you only remove the water connections!!!

1st Drain the engine coolant. Here is what my Heat exchangers (Volvo 2003T) look like removed;
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The top two pipes with the circular fittings are the oil inlet and outlet for the oil cooler. The water comes from the raw water pump, through the fridge heat exchanger, then the oil cooler, then the engine heat exchanger, finally out thru the exhaust.
So, now take the ends off, and you can remove the cores. In this case the fridge unit had a partially blocked outlet, restricting the water flow. Here is the engine H/E with the core removed;
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As you can see, the core is a bunch of small tubes. In this case, they are about the same dia as a .22 rifle bore, so I use a rifle cleaning brush to thoroughly clean them. They were not bad this time. However, the oil cooler has smaller tubes, and was pretty blocked – mostly with sea life, as you can see here;
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Now, some people use Acids to clean these, and it certainly works well. However, be warned – if there are any damaged joints, or thin piping, acids can ruin the core, and replacements are expensive. A radiator repair shop is your best bet for repairs, and can often supply replacement cores MUCH cheaper than a genuine part. Personally I use a calcium/lime/rust removal product, which is much gentler, but also slower. I left this to soak in CLR for a few hours, then rodded out the remainder with stiff wire.
Finally, reassemble everything, replace the engine coolant including a good corrosion inhibitor, replace the heat exchanger anode/s, check for leaks and you are good for another year or so!
As an aside, now you know your system is clean, change the raw water pump impeller, and then note how much water comes from your exhaust at idle - any reduction over time in this flow is an early indicator of a problem.
Oh, I last cleaned these units about 18 months ago, and the boat is used most weekends, year round. Seems the warmer the water the more of an issue it is! This boat is based at Gulf Harbour in Auckland. The growth here is faster than when we were at Mana in Wellington.
Happy Boating!!

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Gunboat Files Chapter 11- Bankruptcy protection

Nov 19 2015 01:56 PM | Island Time in Articles

Gunboat have today filed Chapter 11. :-( Apparently following 2 years of "difficult circumstances" including breach of contract with their Chinese builders of the 66, and trying to enforce what the Chinese company was supposed to do. I wish Peter well, and hope the company comes thru this. they have made some great and innovative designs.

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Coastguard App with Real time wind data

Dec 18 2014 04:17 PM | Island Time in Articles

Coastguard now have an app for Apple and Andriod that has up to date forecasts and real time wind data. Available from the Apple store or Google Play. It's $1.25; An app worth having!!

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Welcome to the new Crew.org.nz site!!!

Dec 18 2014 01:17 PM | Guest in Articles

Welcome to the new Site. Some things have already changed, and some are about to. This new software gives us lots more flexibility than we had previously. The search engine now works! Just make sure you search on the right data - - like select "forums"...

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VHF Frequencies for the North Island

Dec 18 2014 04:27 PM | Island Time in Articles

This was in the Coastguard Northern region newsletter - Be a useful thing to have on your boat. Does anyone have one for the south Island??

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The Crew.org Rum Race is ON

Dec 18 2014 04:48 PM | Island Time in Articles

Click the link above for details. (End of year Rum Race on the menu above) Come and join the fun!! All welcome.

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Here's Des

Dec 21 2014 08:17 PM | Island Time in Articles

Volvo Race and Extreme Sailing series updateshttp://youtu.be/ssevZUEO6vI

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Refrigeration - Engine Driven Systems - DIY

Dec 23 2014 01:24 PM | Island Time in Articles

How engine driven systems work, what the parts are, what they do, and how to service them yourself!
I hope this article might help some of you over summer, when fridge techs are hard to get!

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Rolex Sydney Hobart Starts Today!

Dec 26 2014 09:38 AM | Island Time in Articles

The Rolex Sydney Hobart starts today! It can be watched live online from here http://www.rolexsydneyhobart.com/and the live tracker is here http://rolexsydneyhobart.com/tracker/Discussions in the Race Talk Forum thread Here http://crew.org.nz/forum/in...

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Kiwi's Excel at OK Dinghy Worlds!

Jan 05 2015 09:09 AM | Island Time in Articles

Matt Stechmann secures OK Dinghy world title after classic Black Rock day
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YNZ Briefings

Jan 07 2015 01:26 PM | Island Time in Articles

Latest Yachting NZ Briefings newsletter
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Sorry about the format - still working on how to get it to display properly!

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Problems Logging in to the New System??

Jan 09 2015 01:51 PM | Island Time in Articles

When we transferred the software to the new system, some of the passwords did not come over correctly – could be your problem! On the login page, just click the “forgot password” button, and reset your password. You can use the same one.

If that does not work, so you please read the rest of this!
If your email address associated with your login name is not correct you will not receive the reset pw email, and you'll be stuck. If this is the case for you, please email me at editor@crew.org.nz with your user ID and correct email address I’ll reset your account for you.

If you don't get a response to that emai either, check you junk mail or spam filter. The emails ARE being sent!

Sorry for the inconvenience!

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New Charts for Wellington

Jan 15 2015 11:25 AM | Island Time in Articles

Updated charts support Wellington’s multi million dollar cruise ship industry

Updated nautical charts released by Land Information New Zealand (LINZ) will support the growing number of cruise ships visiting Wellington Harbour.
LINZ Acting Group Manager Hydrography, Jennifer Ryan, says a lot of work has gone into making sure the latest versions of the two Wellington charts meet the needs of the industry, as well as other professional skippers and recreational boaties.
“Cruise ship visits to the capital have doubled over the last eight years, and the vessels are also growing in size. This means having accurate navigational information is more important than ever,” says Jennifer.
“We’ve used new survey data and consulted extensively with pilots and the Harbourmaster in updating these charts.”
Figures from industry body Cruise New Zealand show that the 2013/14 cruise season contributed $34.8 million to Wellington’s economy, and supported 688 jobs. The 2014/15 season is forecast to contribute $35 million and to support 693 jobs.
The updated charts cover Wellington’s wharves, the harbour entrance as well as the inner harbour. Updated information includes changes to lights and light sectors, and more accurate representation of wharves and marinas.
“Another priority has been to include details useful for recreational boaties. One example of this is that we have extended the charts to now include Seaview Marina.”
The two charts, NZ 4633 Wellington Harbour and NZ4634 Wellington Harbour Entrance and Plans of Wharves, are available from approved retailers. Digital versions are also available to download free of charge from the LINZ website.

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Jan 19 2015 07:28 AM | Island Time in Articles

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Mahurangi Regatta

Jan 19 2015 08:15 AM | Island Time in Articles

The annual Mahurangi Regatta is on this weekend! (24-27 Jan) The main event is Saturday 25th.
It is a great event for families, and ALL vessels are welcome, you don't have to have a Classic. I went up last year, and is is a great spectacle, and well worth the trip. The regatta party is family friendly, and afterwards (or the next day) a trip up the river to town in the dingy is well worth while. If it is hot, take your togs for a swim in the quarry on the way past.

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Further details and entries are here http://www.mahurangi...eral-Format.php

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Here's Des

Jan 21 2015 10:28 AM | Island Time in Articles

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2015 Volvo National Sailing & Boating Day

Jan 29 2015 12:39 PM | Island Time in Articles

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Metal Finish that repels Water

Feb 03 2015 09:40 AM | Island Time in Articles

This could have major implications for the maritime industry!

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Software Glitch

Feb 16 2015 08:22 PM | Island Time in Articles

Another Glitch in the software tonight. If your page is not displaying properly, please use Ctrl F5 to refresh, and it should come right... or command-r on a MAC. If that does not work on the Mac, please clear your cache!
We are putting together a test server to try to avoid these issues as much as possible. Thanks for your understanding!

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Y88 South Island Champs

Mar 04 2015 09:04 AM | Island Time in Articles

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Knight Frank South Island Young 88 Champs

After successful campaigns in Waikawa and Wellington over the summer Craig Edwards and his team on Flying Machine must be seen to be the favourites to defend their Knight Frank South Island Young 88 title this weekend on Lyttelton Harbour. But Edwards is not expecting have it all his own way.

A very credible challenge is expected from 2013 winner Shibbeen (Humphrey Rolleston) which will be skippered in this year’s challenge by Shane Smith. Smith who’s regular crew on his Elliot 780 Overspray is also in form after a second placing at the Lawsons Dry Hills Regatta in Waikawa in January. It will be the first time that Smith, a past Sunburst National Champion and South Island Zephyr Champion will helm a Young 88 in Class racing. But his experience in trailer yacht and dinghy classes is expected to make him a tough competitor in this class.

Flying Machine has recently returned from the Sovereign Port Nicolson Regatta in Wellington where their polished all round performance made quite an impression on the local fleet. They won the Roger Land Young 88 Trophy with 7 straight line honours wins together with Division B line and IRC victories. Tactician Seamus Tredinnick said of their performance “we have been sailing together as a team now for several years and this really shows”. “Craig and Nicci run a great team and we all enjoy sailing the boat as hard and fast as she will go” he said.

Credible challenges are also expected from Full Circle (Phil Folter) who is last season’s Naval Point Club Champion. They know how to take races off Flying Machine and demonstrated so at last year’s Championship in Akaroa. Colin Lock and his crew on Legacy II also travelled north this summer gaining the experience of close racing at the Waikawa Regatta in January.

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It will be a busy weekend at Naval Point Club, Lyttelton. In addition to the Knight Frank South Island Young 88 Championships the club is also hosting the Canterbury Trailer Yacht Championships, South Island 420 Championships, South Island Laser Championships, Canterbury Zephyr Championships and the Naval Point Club Dinghy Championships.

Naval Point Club / Young 88 Association

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Mar 05 2015 09:16 AM | Island Time in Articles


No official history of the race has been written but we do know that a race has been sailed in many of the years since the first known event in 1921. The early event was known as the Auckland-Tauranga Ocean Race. It is known the Race was also sailed every year from 1921 to 1930. The Race in these earlier years started on occasions on Christmas Eve. Generally they were sailed over the Christmas break with the finish line off the Strand and timed to coincide with the sailing of the Tauranga Regatta on 27 December. Media interest in keel boat racing was intense in these early years.

The Trophy for many of the early races was the “Tauranga Gold Cup” which was renamed in 1926 the "Colin Norris Memorial Gold Cup" (now generally known as the “Gold Cup”). Colin Norris was secretary of the Tauranga Regatta Committee and the instigator of the Auckland to Tauranga Race.

Auckland yachts that regularly competed in the Race included: Queenie, Victory, Nga Toa, Restless, Prize, Waitangi, Waione, Iorangi, Wairiki, Heartsease, Mahaki, Ladye Wilma and Waiomo.

The line honours results for the year prior to World War II are taken from the Gold Cup.

The 1921 Race started at 7.30pm on Christmas Eve. It was started by the RNZYS at Kings Wharf and finished at the Mount. The Race was won by Waione (CF McWilliam) with the Tercels sailing Restless coming second. In this Race one of the yachts had carrier pigeons sent from Tauranga with progress reports!.

In 1922 the Tercel brothers, again sailing Restless, won the Race and the "Tauranga Gold Cup". In 1923 Restless finished third. By this time the Auckland to Tauranga Ocean Race was established as a major yacht race.

In 1923 the Race was won by Queenie (T. Hill) with Wairiki second. Queenie (T. Hill) won again in 1924.
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In 1925 Vanitie (J. & E. Morris) took line honours. Wairiki (S. Speight) won in 1926.

In 1927 Iorangi (Geo McKenzie) was the winner. Line honours in 1928 were taken by Nga Toa (Winstone Brothers).

In 1929 the Race was won on line and handicap by Wairiki (S. Speight). The programme noted the Race was for keelers and mullet boats. Wairiki took line again in 1930 under the ownership of D. Macky.

In 1931 Clark and Wilson sailed Naiad (Naird or Ngairo appears on the Cup), the first of Lou Tercel’s boats to victory in Race. Naiad won the Race one more time in 1949.

The Gold Cup records further winners after 1931 as: 1932 Ngatoa (Winstone brothers); 1933 Waione (P. J. Thompson); 1934 Tawhiri (R. B. Steadman); 1935 Altair (Tattersfield and Mills); 1936 Waiomo (N. C. Mains); 1937 Tamatea (N. H and J. H. Newcomb); 1938 Tangaroa (J. E. Inkster); 1939 Ngahau (W. Burns).

The first Race sailed after World War II recorded in Club records was in 1948 when the prizes were “suitably decorated pennants”. The Finish was off Coronation Pier. The Gold Cup however records winners from 1944 to 1949. These are: 1944 Speedwell (W. Paterson); 1945 Vanitie (M. Georgettie); 1946 Whakanui (J. Cook); 1947 Mandalay (W. A. Wilkinson); 1948 Vanitie (C. Morris); 1949 Naiad (J. Moulden). It is unclear as to whether these winners were for the Auckland Tauranga Race but the appearance of some of the pre-war entrants would suggest that they were.

Club records show further races in 1952, 1953 and 1954 after which the Race was discontinued due to lack of support. The Race was sailed again in December 1957. The entry fee was one pound. The next Races would seem to be in 1965 and 1966, the latter with only four entries. TYPBC records show that there was a Race in 1970 sailed at Christmas as part of a junior offshore group (JOG) rally. This race was won by Noel Angus on the One Tonner Mustang which set a race record of 16 hours in doing so.

Records show the Race was cancelled in 1977 due to lack of interest. In 1983 the Race was revived with the sponsorship of Malcolm Fowler Motors and the timing moved to Easter. A separate article has been written about this Race. Since then the Auckland to Tauranga Race has been sailed every year with two exceptions. These were in 2001 due to forecast gale force north-easterly winds and again in 2013 when a combination of strong south easterlies and debris from the wreck of the Rena on Astrolabe Reef created a risk of damage to entrants.

Based on the above up to and including the 2011 event the Race has been competed for in all probability on at least 55 occasions.

Much of the above material was gleaned from “The History of the Tauranga Yacht and Power Boat Club” edited by Marion Smith. Further material was taken from the book “Southern Breeze: A History of Yachting in New Zealand” p126. Tauranga Yacht and Power Boat Club would be delighted to hear from anyone who can assist with filling in more detail about the Race. You can contact the Club by telephoning 07 578 5512 or by email at office@yacht.org.nz .

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Here's Des

Feb 05 2015 08:10 AM | Island Time in Articles

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Two Handed Three Legged Race

Feb 05 2015 08:46 AM | Island Time in Articles

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Entry form is here;

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Boost your Charging Abilities with a NZ made Sm...

Feb 16 2015 04:05 PM | Island Time in Articles

Get the most from your alternator - A NZ designed, manufactured and supported Smart Regulator at a great price!
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