Yacht Sweet Waters

48 Ft Lello Blue Ocean Cruising Yacht

22 August 2015 | Hout Bay
05 August 2015 | Mossel Bay
03 August 2015 | Mossel Bay
27 July 2015
27 July 2015
10 July 2015
09 July 2015 | Mossel Bay
10 June 2015 | Mossel BAy
21 March 2015 | Mossel Bay
23 February 2015 | Mossel Bay
14 February 2015 | Mossel Bay
13 February 2015 | Between Plettenberg Bay and Mossel Bay
12 February 2015 | Opposite Tsitsikama forests
09 February 2015 | Port Elizabeth
30 January 2015 | East London
27 January 2015 | Durban
19 January 2015 | Richards Bay

Completely re-manufactured header tank in stainless steel.

26 July 2015 | Mossel Bay
Izak
After the aluminium heat exchanger unit on our 1972 Perkins 4236 M corroded beyond repair, we installed the stock standard header tank coupled to a freestanding Bowman heat exchanger. Front and back temperature on the block became divergent by an average of 10 - 25 degrees. If it was not for the fact that the engineers that did the last overhaul dropped the block from what must have been some dizzy height (they never told us), it would probably not have cracked. As it turned out it did en route to Mossel Bay, so we had to get a new block and do a complete rebuild. However, testing our system revealed that the front and back engine temperatures were still too divergent for comfort. We consulted all the Internet forums on the problem, and there are many. Everyone seems to have the same problem and answers are very complex, diverse and expensive indeed.

As it turns out, the usual conversion using separate header tanks and heat exchangers does not work because the engine driven water pump simply assists a system reliant on a 'siphon - convection system' used in those engines. As a result, the flow rate is messed up and the entire convection cycle is constricted.

Ordering a replacement system means you are again stuck with aluminium which corrodes away. About Uk Pound 730 (R 14,311) for a conversion by Bowman (http://www.asap-supplies.com/marine/perkins-4236-manifolds-hose/bowman-marine-heat-exchanger-pe390-3674) that is made of steel and sits on the outlet manifold of all places. So it will eventually corrode away like the aluminium one Perkins originally fitted and which costs almost three times as much again.

So I produced drawings for a stainless steel version of the header tank as it was configured on the original engine. Then we sent these out to most of the engineering firms in Mossel Bay. We were even taken to some of them by by the Mossel Bay mooring manager, Schalk Bothma.

Manie Taljaard of Tallies Engineering in Mossel Bay was first off the mark with a really excellent quote and then produced a new header tank out of stainless steel for the pipe-stack of our old heat exchanger within a few days. He improved on our drawings by incorporating extra lateral reinforcing. In addition, he made the radiator cap aperture out of stainless and then he polishes it all up as well!

The cost of this tank was less than a quarter of the Bowman version and about 10% of the replacement part.

This guy should be taking orders from the many people worldwide that have a similar problem with an engine known as a favourite in the 40 ft + sailing yacht community.

We will test run this next week and post results here as well as on our www.sailblogs.com and Facebook sites. Postings on the Q&A forums re the problem on Noonsite and Cruising Sailor will link to this posting.
Manie can be contacted on +27 (0)720677895 or e-mail him on manietaljaard@yahoo.com´╗┐
Comments
Vessel Name: Yacht Sweet Waters
Vessel Make/Model: Lello 48
Hailing Port: Durban
Crew: Izak Labuschagne
About:
Izak (Skip). Been Sailing 40 years, charter captain for over 22 years of that. Done all sorts of stuff in between (www.izak.co.za). Like all yachties, a jack of all trades having done refits on Sweet Waters and even converted Navy patrol vessels. [...]
Extra:
Route plan: - Richards Bay to Cape Town via East London & Mossel Bay, then to St Helena Island in the middle of the Atlantic, then to Trinidad and Tobago in the Caribbean, Panama, Pacific Go check our progress on the map below. For now, we are in Cape Town, pursuing work opportunities to [...]
Home Page: http://www.sailblogs.com/member/sweetwaters/
Social:
Yacht Sweet Waters's Photos - Main
Some pics of the trip from Richards Bay to Durban to East London to Port Elizabeth, past Plettenberg Bay to Mossel Bay.
19 Photos
Created 9 July 2015
Last days befor departure
4 Photos
Created 19 January 2015
21 Photos
Created 17 May 2012

Yacht Sweet Waters

Who: Izak Labuschagne
Port: Durban
Latest
And more...