I am the original owner of #1245 (Fall '92). For the first ten years on the Ches. Bay we cruised at 2200rpm, 6.3 knots in flat seas, and 165-170 degrees of temp.
Just before moving the boat to shallower and warmer waters of the North CArolina sounds(10 years ago), the heat exchanger was pulled and cleaned.Engine temps in NC waters routinely are 10 degrees hotter...175-180.
In the last two years we have had the seawater pump replaced (it failed), the heat exchanger pulled and cleaned again, but are seeing temps routinely of 180. Ocassionally temps increase and for no apparent reason, after the next engine start, run back to normal.
One suggestion offered by several local sailors to avoid the hotter temps was to increase the size of the heat exchanger.
Is that possible on a M35 (1992)?
Would it be desirable? ---thinking that a larger heat exchanger would produce more cooling and, as a result, lower engine temps.
Interested in your thoughts.
Brian Giersch
New Bern,NC
Encore
#1245
Brian
I had the same problem with my M35, high engine temperature, especialy here in sunny Florida in the summer with our 85-90 degree sea water. I tried everything including cleaning the HX. No amount of cleaning worked. Finally in January 2012, I called in a well respected engine mechanic who told me I needed a new heat exchanger. I got the best price from [url]www.inetmarine.com[/url], phone 1-215-672-6407, for a new copper/nickel unit.
I went to their web site and found several HX for westerbeke engines and not being sure which unit was the correct one, I called the company and told the salesperson what engine I had and he told me which HX unit I needed. Price was $424.85 plus $25.99 shipping from their factory in Seattle, Washington.
Now I can go at whatever speed I want and the needle stays at 160 in the summer and a few degrees lower in the winter.
__/)__/)__/)__Capt Mike__/)__/)__/)__
Punta Gorda Florida
1990 Std WK M35 Hull #1050
These 160F temperatures are too low for good efficiency, low emissions and best durability in a diesel, most highway diesels run 185-190 degrees with factory spec'd equipment. Fuel consumption takes a dump when you run them lower than factory spec.
I have no idea why Universal/Westerbeke put a 160F Tstat in the M35, our M3-20 had a 185F spec'd for it in the manual and it ran at that all the time. With the 160F spec'd for the M35A in our cold Lake Ontario water (most bays are still below 70F this year) ours rarely sees 160F on the gauge.
I am guessing it is done just to keep engine room and exhaust temps down as much as possible, but from the perspective of the engine's health, efficiency and emissions, everything I read and have experienced says it is not a good thing to run them that cool.
Encore, I have a 1993, M35A with same temperatures as you. Normal cruising rpm 2200 and can hold 165 if lake temperature is below 70F. I find the coolant temperature will settle out at 180 - 190 when the lake is 75F.
I don't think you need a new heat X unless you get above 190F
JAck F Stewart
1993 C36 #1233 "Windancer"
Port Clinton, OH
Two HX sources:
[url]http://c34.org/bbs/index.php/topic,6920.0.html[/url]
Only other choice is to use a 160F thermostat.
190F is not a bad operating temperature.
Stu Jackson, C34IA Secretary, C34 #224, 1986, SR/FK, M25 engine, Rocna 10 (22#)