Cruising Sailors Forum Archive

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• Anyone know how "sensitive" the raw water circuit on a diesel can be to flow restriction, i.e., hose diameter, bends....
  • Sorry, not "circuit", I mean "system"
  • Cumulative effects....
  • Perhaps the pump is marginal...
    • Advice I got today from Volvo Penta suggested the possiblity of marginal R/W pump performance
      • reply
        • I hate, hate, hate this new format!
          • Oh com'on
            • It begs the question,
            • Sounds like someone watches, O'Rielly!
              • Many of us do.
          • I don't find it really any different.
      • Those pumps are very sensitive to the size of the housing
        • By chance a Volvo shop yesterday referred me to a specialty marine pump shop in town --they said the same thing
          • Don't spend too much evaluating the raw water pump, as a new one is only $250
            • Meant $150
              • That's good to know, in case mine is worn out. I think the shop can test them pretty quickly and cheaply, they told me.
          • Hi all--here are the results of my two "bucket tests" yesterday to check raw water flow from the engine: seems low
            • Volvo Penta just called and gave me these Volvo 2030 29HP engine specs for raw water flow
              • Raw water cooling
                • Good idea...once I get my pump tested, and if flow is to spec, then that would point to an air leak somewhere, making
                  • This has been informative Jud.
                    • Another piece to this puzzle, that confuses it even more, is that Jabsco pumps says that flow rate for an engine like
                      • It would be related to heat exchanger size Jud.
                        • Probably, Tom --but you'd think it would scale down proportionally
                          • No need to measure in 2 places!
                            • I don't think this is a valid assumption.
                              • Another Volvo shop told me today there is a cam in the pump that can definitely wear down, reducing pump output...
                                • If you really think it is the raw water pump, then a buy a new one.
                                  • I just ordered some Permatex #18; will pick it up tomorrow. With regard to
                                    • I believe you are looking for Johnson 10-24178-2. No gurantee.
                                      • Just wondered what would happen to this upside down tree
                                        • Wow, there seems to be a hard right margin... how far does it go?
                                          • apparently, they are using a blockquote style indent
                                            • p.s. thank you for the colon
                                          • AND WHATIFTHEWORDSWEREBIG
                                            • AHH!!!PUSHINGTHEENVELOPE
                                      • Paul --thanks a ton. I just checked and think this is the one.
                                • Additional experience (Raw water pump)
                                  • Efraim --thanks, now I can see what the cam is. About the elbow and flow resistance...
              • Anyone ever heard of a raw water flow meter/alarm, like this one?
                • I have these
  • Overheating and hose restrictions
    • David --I just PM'ed you (via board email). Thanks for the info when you have a chance.
  • Jud, my vented loop is probably 12-14 ft round trip.
    • Cool, thanks for the info, Paul...useful to know. Any idea of hose inside diameter? I've got 1/2", same as piping on
      • When you open the coolant side drain, does the coolant flow out quickly and immediately?
        • Yes...in fact, I changed the coolant yesterday before leaving the dock. Well, it flowed out quickly after
          • I use suction pump to remove mine, it drains completely.
            • What kind of suction pump, something plastic/handheld? Just curious what kind?
              • SuckUp
                • Do you put it in the drain plug on the right side of the block, i.e., after letting gravity drain most of the coolant?
                  • I put the tube onto the drain plug directly.
  • We had same problem with a volvo 2003T and
    • More on Volvo cooling
      • Thanks, Neil. I don't have an oil cooler, but do of course have the small diameter hose between reservoir & thermostat