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Old 22-07-2008, 06:19   #1
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Coolant/water volume for Perkins 4236 and other info

I intend to drain and replace coolant/water and noted that in their manual they show the motor volume only... not with the radiator/ hoses etc. I would appreciate anyones input as likely marine total.... Also they recommend for tropical areas (venezuela) a ratio for coolant/ water as 1:2.

I have read previous threads recommending 50% and initially thought to go with this ratio of "motor volume" on the assumption that the extra water would probably bring to 30% ratio. Then realised that the specific knowledge was available here in CF.

Further, there was an interesting thread a few weeks ago discussing whether it was best to allow the prop to be free or locked in reverse, while sailing. (it was suggested that the manual would recommend). Unfortunately the associated documentation is in French and my French is not good enough.
However, I believe it is a "Borg Warner 72CR Reverse gearbox 2:91:1"

Simple question does the "Reverse" in it's name indicate, that it should be locked while sailing and if so, what is the correct process of doing so?

Finally the rating is Circa 72-80HP (general manual) The marine manual does not specify. vehicle is 80hp and heavyduty 72. I assume that a 17 ton steel ketch is assessed as "heavy duty". It doesn't have a rev counter and the manual, depending on configuration provides a scale of between 2200 to 2800. I would like to know

As always many thanks in anticipation

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Old 23-07-2008, 01:39   #2
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Originally Posted by anglooff View Post
... Unfortunately the associated documentation is in French and my French is not good enough...
Select French-English and insert appropriate text (sometimes 1 word at a time works better):

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Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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Old 23-07-2008, 05:01   #3
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Just a suggestion but measure how much you drain. That will give a good indication of how much is in there now which should be close to the correct volume.

I have a 4.236 but not near manuals. As far a load I would expect that it is rated at 82HP at least mine was 1985. Also the load is not just the weight but based on how propped etc. Ours rarely fully loads up on a 16T 47 - an only when I am doing harbor maneuvers.
S/Y Sirius
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