Perko sea strainer caps

Discussion in 'General Maintenance/Repair Questions' started by northshore, Sep 22, 2017.

  1. northshore

    northshore Well-Known Member GOLD Sponsor

    Jan 17, 2011
    Cleveland, OH
    1989 340 Sundancer
    Raymarine E90W Radar/Chartplotter
    Twin 454 Mercruiser 340's
    Looking to do a project to help the engine winterizing go a bit quicker this year and need and additional set of caps for my sea strainers. Anyone have a good source?
     
  2. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
  3. alnav

    alnav Active Member GOLD Sponsor

    876
    Sep 16, 2009
    West River, MD
    40 MY
    QSB 425
    IMG_0012.jpg
    I found the pictured "Mechanical Test Plug" at Home Depot for about $5. Screws right in to my strainer and already has a hose fitting on top.
     
    The Bill Collector likes this.
  4. northshore

    northshore Well-Known Member GOLD Sponsor

    Jan 17, 2011
    Cleveland, OH
    1989 340 Sundancer
    Raymarine E90W Radar/Chartplotter
    Twin 454 Mercruiser 340's
    Both great ideas and much cheaper - thanks!
     
  5. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Those ideas will work well for a Groco but not a Perko.
     
  6. jonsm114

    jonsm114 Member

    188
    Sep 4, 2015
    Defiance, Mo
    1996 400 Express Cruiser
    7.4 MPI Mercruisers
    I would think Perko still makes replacement caps for the older strainers. I know the newer style, 2005 and up, are available with hose inputs and valves for flushing. Those newer caps will not fit the older strainers, as confirmed by Perko directly. I am machining and threading my old caps and installing garden hose female couplings in mine this winter while the boat is resting.
     
  7. Soulshine

    Soulshine Active Member

    405
    Sep 25, 2016
    Seneca Lake, NY
    '83 SRV 360 Express
    Twin Merc. 454
    When I bought my boat, the P.O. showed me all of the T fittings and plugs he installed all over the place to facilitate winterizing.

    I ripped them all out since they were set up to accept 3/4” hoses while the system is actually 1 1/2”. Everything I read about flushing or winterizing is very specific about NOT stepping plumbing down in size. Starving the pump seemed to be what was behind that and I agree.

    Flushing under hose pressure is fine I imagine since you’ll be pushing more water in than the pump would draw through the smaller hoses.

    With my system returned to stock, I winterize using a container with fittings and a ball valve with a 1 1/4” ID. This size hose barb fits right into the stock 1 1/2” hose on the incoming side of the pump with only a minor reduction in size.

    Once connected, there are no leaks and I can open the valve, casually climb back up to the helm and start the engine.

    That container is drained in a few seconds at a pace in keeping with the needs of the pump.

    Recently I saw a guy fighting to winterize a pair of inboards using one of those plunger flusher things jammed under the boat. He had a pail of anti freeze on an 8’ step ladder trying to create pressure to prime the pump.

    Upon starting the engine, the pail drained painfully slowly through the 1/2” ID passages and then stopped going down. His pump was moving more air than liquid and the impeller failed.
     
  8. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
  9. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
    I actually have a 2" threaded PVC fitting that works on my gennny and air conditioner strainers. I only linked the one from Defender to show the OP that they were available off-the-shelf.
    IMAG0338.jpg
     
    Irie308 likes this.
  10. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    I've tackled this 3 different ways...

    Previous boat - Didn't require removing caps to flush/winterize...
    [​IMG]

    This boat, also doesn't disturb the caps but requires screwing in a plastic nipple...
    [​IMG]

    Both boats, I use this for the gen and for the air condx. An extra cap was purchased, drilled, tapped and fitted with a boiler valve. This is only used at winterization time. During the season the regular caps are in place...

    [​IMG]
     
  11. Sublimetime

    Sublimetime Active Member

    714
    Oct 22, 2007
    clifton nj
    420 da
    454
    in the big box store , by the galvanize pipe fittings you can find the flange that allows you to fasten a pipe to the floor or wall such as a hand railing. If you get the two inch pipe size , it matches up to the perko strainer pretty close, kind of like a perko cap with a large hole in the center. fashion a gasket to sit it on top of strainer tight.. Reduce the thread size to whatever hose you want to drop in a bucket and away you go.
     
    Chris-380 and Matt Michels like this.
  12. Matt Michels

    Matt Michels Member

    30
    Apr 12, 2019
    Centreville, VA
    2006 Sea Ray 380DA
    Yanmar Diesel
    Thats a great idea. Do you have any pictures? I have a 1 1/2" perko strainer for the engines and 3/4 for the a/c and Gen. I thought about buying a new cap and drilling, but your method is a bit cheaper
     
  13. Spark600

    Spark600 Member

    82
    Dec 28, 2013
    Long Island NY
    2008 Sundancer with 496 SeaCore Bravo 3
    Kohler Generator
    Mercury dinghy
    496 SeaCore Bravo 3
    I did the same for the engines and the gen and A / C I use a 3/4 circulator flange from a boiler fit perfect
     
    Last edited: Aug 20, 2019
    Matt Michels likes this.
  14. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    8.2 Mercs
    85 Sea Ray Monaco 197
    260hp Alpha 1
    I did indoor heated storage and never looked back...

    MM

    Thanks for reminding me why...
     
    Matt Michels likes this.

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