[C320-list] Perkins M30 diesel water temperature sending units

[Dick Walker]

Agree. Don’t forget to change the water pump impeller and gasket every 3 years.  

Cheers



Dick Walker
740 Olive Ave.
Coronado ,CA 92118
619.435.8986



> On Jan 21, 2020, at 10:55, Mark Seyler <mseyler at cox.net> wrote:
> 
> The filter size for the Racor and the secondary filter generate conflicting
> opinions.  I personally think it depends on how much you use your motor, and
> how often you are willing to change the filter.
> 
> On my boat, I use a 2 micron filter on both my Racor and my secondary
> filter. I also usually change the Racor when I do an oil and oil filter
> change once a year in the winter, even though I am nowhere close to the
> maximum number of engine hours the manufacturer recommends.  Some would
> argue what I'm doing is overkill.  But it's a lot cheaper to replace a
> filter than to rebuild an injector pump if enough crud gets through the
> filter to damage the pump.  And I'd also rather change the filter at the
> dock, on a day when there's no wind to sail, instead of while bouncing
> around after a clog shut down the motor.
> 
> I've seen the argument that the 2 micron filters could starve the engine.
> But according to Racor the maximum flow through the filter (when new) is
> something like 12gph.  My Perkins only burns about 1/2 - 3/4 gph at cruising
> speeds, so I think the filter would have to be pretty thoroughly clogged to
> get below that flow rate.  With an annual change of the Racor, and changing
> the secondary every 2-3 years, I haven't encountered any problems with
> clogging.  But the longer you go between filter changes, the more chance
> that the finer filter could get clogged.
> 
> You can also find differing opinions about whether the secondary filter
> should be the same size as the Racor. Theoretically nothing should be
> reaching the secondary filter that is bigger than the screen size of the
> Racor filter.  If you use a finer filter on the secondary than the Racor, it
> could catch things that got through the Racor, but then you're more likely
> to clog the secondary filter.  Some folks argue that using a slightly
> coarser filter on the secondary means that it is less likely to clog from
> bad fuel, and you'll only have to change the Racor if a clog shuts down the
> engine.  But even then I'd want to at least use the coarsest filter size
> that would protect the injector pump.  (Maybe a 10 micron?)
> 
> For me it's not that hard or that expensive to do the Racor when I change
> the oil and oil filter, and I've had no problems with the finer filters on
> that schedule.  But if I were using the motor more hours, I might make a
> different choice.  I wish you good luck with whatever choice you make.
> 
> Mark Seyler
> S/V Reality, 
> Catalina 320, #232
> New Orleans, LA
> 
> 
> 
> -----Original Message-----
> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
> Of Bob Borelli
> Sent: Monday, January 20, 2020 9:19 PM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Perkins M30 diesel water temperature sending units
> 
> Thanks Charlie,  for your response.
> 
> My next trip to the boat I will be testing the sender, wiring, connectors,
> alarm & horn, and determine the thread size on the water pump sender & see
> if I locate a new sender.
> 
> I've changed several raw water impellers this season.
> First 10-blade lasted 39 hours, 2nd 6-blade 8 hours & current 10-blade 9
> hours already has 2 deformed blades.
> I grease them before inserting in the pump.  These are Jabsco impellers
> 18673-0001/0002.
> 
> The boat is in a wet slip, winterized diesel.
> I will change the fuel filters in April.
> Question is which filters.
> Currently the primary is a Racor 24S 2 micron & the secondary Perkins
> 130366020 (4429491) 25 microns.
> 
> The marina's diesel guy says the 2 micron primary is starving the diesel &
> should change both filters to Racor 24T 10 micron and secondary NAPA 3386 10
> microns.
> 
> The boat came with the 24S & Perkins, I not sure I want to make a change in
> filters.
> 
> What fuel filters are you using on on your Perkins M30?
> 
> Bob Borelli
> C320 #209
> Maryland
> 
> 
> 
> ________________________________
> From: C320-list <c320-list-bounces at lists.catalina320.com> on behalf of
> Charles Holbrook <charlesholbrook at ymail.com>
> Sent: Monday, January 20, 2020 11:38 AM
> To: C320-List at Catalina320.com <C320-List at Catalina320.com>
> Subject: Re: [C320-list] Perkins M30 diesel water temperature sending units
> 
> Thanks for your detailed explanation of your wiring and alarm system.  I too
> have a 1995 Cat 320 #192 and I had an engine temp. issue last year but my
> audible alarm and red indicator light worked.  Glad to know that as I never
> tested it.  Turns out a small fish got sucked up into the intake.  The
> strainer stopped anything from getting into the cooling system but I had no
> water flow and a couple of pump impellers were damaged.  I just jury rigged
> my air compressor hose and gave the main water intake a short blast of air
> and it cleared out the system.
> Charlie Holbrook, Port Clinton, Ohio"Nautigirl"
>    On Wednesday, January 15, 2020, 08:16:45 PM EST, Troy Dunn
> <troutwarrior at gmail.com> wrote:
> 
> 
> 
>