Recommmended Engine Warmup

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Todd320, Apr 16, 2018.

  1. Todd320

    Todd320 Member

    207
    Jul 21, 2016
    St. Petersburg, FL
    2007 Sea Ray 320DA
    Twin V-drive 5.7L 350 Horizon
    My mechanic has asked me to warm my 07 5.7L engines up at 1000 rpm until they reach operating temperature. Not sure if anyone else has heard this recommendation but I thought I would pass it along. I am not sure on the why, or if this is common knowledge, he made it sound like this was a recently new (last 3 or 4 years?) recommendation from MerCruiser.
     
  2. superwa

    superwa Member

    38
    Jul 27, 2013
    Rhode Island
    2001 Sea Ray Sundancer 380
    Mercruiser horizon 8.1S
    I start them and just let them run until they reach the temp. Did he say why they should be reved up? My engines are 17 years old and purr like a cat, so I won’t change what I do, but wondering why.
     
  3. Stee6043

    Stee6043 Active Member

    829
    Jun 1, 2015
    West Michigan
    1999 Sundancer 340
    454 Mercruiser's w/ V Drives, Westerbeke gen set
    Yuck....sounds like the opposite of what my brain tells me would be best??? I want those motors running as slow as possible until they are up to temp. Unless you're not getting proper oil pressure at idle I can't think of any reason to rev them?

    If I heard a dock neighbor start their boat and kick the throttle up and leave it I'd probably 1.) think they had too much to drink and 2.) go ask them what's wrong with their boat. :)

    Of course my boat is antique these days. Maybe there is a reason to do this....I've just never heard of such a thing.
     
  4. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    a guy near us used to start his boat ice cold and let it run at almost 3,000 RPM until it was warmed up. Craziest thing I've ever seen. Of course, he had zero problems with it during the time he was down there yet somehow my incredibly maintained boat blew a drive that year so maybe he was on to something
     
  5. SloBurn

    SloBurn Member

    754
    May 30, 2013
    Greenwood Lake, NY
    1994 270 Sundancer. 7.4L Merc. Tow with a 2006 Dodge RAM Hemi
    340 HP Merc 454 c.i.
    1000 RPM is not all that high, But I would let them run 1 or 2 minutes before bumping up to 1000 RPMs. I never run mine up to operating temp before heading out, but rather just enough to make sure they don't stall while pulling out of slip.
     
  6. skolbe

    skolbe Active Member

    Oct 3, 2006
    St. Louis, MO
    320 Sundancer, Mercury 310 Sport Inflatable Tohatsu 6HP
    350 Mag V-Drive - Kohler 5ecd
    When I bought my boat the delivery captain said start it in the slip let it idle for a minute or two and then start untying lines. By the time you idle out of the marina you are good. He did say if going slower (Out of the marina) to be at least at 1600 rpms would be better for the transmissions.
     
  7. joeyleggz

    joeyleggz Member

    275
    Jan 15, 2013
    long island
    current boat: 1997 sea ray 330 express cruiser
    twin 454's efi
    I’m guessing maybe he’s thinking a lot of these MerCruiser motor are prone to water ingestion especially at very low RPM you get misting coming back with the exhaust pulses but if you bump it up to 900 or 1000 RPMs there’s enough pressure to push out the mist there was actually a MerCruiser bulletin about how to not run your motor at idle for extended periods of time remedy was to run your boat at 1000 RPMs for a minute or two to dry up and push out any water that worked its way back to the exhaust valves
     
  8. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    This sounds like advice for a specific type of exhaust system that does not have water lift mufflers. Out of respect to neighbors, we generally get the boat ready to leave by stowing power cords and lines. When that work is done, we start the engines and idle out of the slip at 650 rpms give or take a little. If we kicked it up to 1000 our wake would draw complaints. At 1600 rpm, the sheriff would soon be tied up to our boat writing a ticket. We have a 7 mile long no wake zone from our home slip to Lake Michigan. We are at cruise temps long before we get there. Many times our boating consists of putzing along at 5-6 knots due large waves on Lake Michigan.
    Maybe your warm up procedure depends on the engine exhaust set up you have.
     
  9. joeyleggz

    joeyleggz Member

    275
    Jan 15, 2013
    long island
    current boat: 1997 sea ray 330 express cruiser
    twin 454's efi
    Sorry I was not recommending to run your boat at 1000 RPM in a no wake zone what I meant was maybe the mechanic was recommending upon start up bumping the idol up slightly also upon returning from long runs in no wake zone’s the bulletin recommended once you are docked before you shut down your motor to allow it to run at 1000 RPM for 1 to 2 minutes then slowly dropping the throttles and shutting off the motor to dry up any exhaust mist that has settled I added the link in case anybody wants to read up on it maybe you could help somebody out http://www.boatfix.com/merc/Bullet/01/01_13.pdf

    runrecommendedQUOTE="sbw1, post: 983440, member: 506"]This sounds like advice for a specific type of exhaust system that does not have water lift mufflers. Out of respect to neighbors, we generally get the boat ready to leave by stowing power cords and lines. When that work is done, we start the engines and idle out of the slip at 650 rpms give or take a little. If we kicked it up to 1000 our wake would draw complaints. At 1600 rpm, the sheriff would soon be tied up to our boat writing a ticket. We have a 7 mile long no wake zone from our home slip to Lake Michigan. We are at cruise temps long before we get there. Many times our boating consists of putzing along at 5-6 knots due large waves on Lake Michigan.
    Maybe your warm up procedure depends on the engine exhaust set up you have.[/QUOTE]
     
  10. importmonkey

    importmonkey Active Member SILVER Sponsor GOLD Sponsor

    579
    Jul 9, 2015
    Middle River, MD
    2007 44 Sundancer
    QSC 500s
    I'm going to use this excuse next time. Sorry, honey. There was a technical bulletin that said misting could occur if we idle too long. Something about misting being ingested up the exhaust pipe? So we need to skip the foreplay and bump it right up to 1,000rpm.

    ;)
     
    joeyleggz likes this.
  11. Quint4

    Quint4 Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Oct 6, 2006
    S.W. Ohio
    330 Sport Bridge
    5.7 MPI 350 Merc Bluewaters
    Excerpted from Mercury Service Bulletin 2001-13 (google it for the entire bulletin):


    Screen Shot 2018-04-17 at 7.51.47 AM.png
     
  12. MikeBravo

    MikeBravo Member

    69
    Jan 20, 2016
    Treasure Island, FL
    2007 Sundancer 320
    1988 Grady White 24 Offshore
    DA-Twin 350 MAG MPI Mercruisers, V-drive
    GW-Twin 2009 E-Tec 130hp outboards
    I always let my engines warm up to temp before pulling away from the dock. If I don't they sometimes will stall, not good in close quarters during windy conditions. My routine is to run the blowers for 5-10 minutes, then start the port engine then the starboard engine. I let them idle while I prepare the boat to get underway. I cruise out of my dock at idle and when I get to the end of my canal and on the fairway I bump up tp 1000 rpm until I get to the ICW.
     
  13. aerobat77

    aerobat77 Member

    319
    Aug 12, 2014
    germany
    2006 240 DA Sundancer
    5.0 MPI / Bravo III
    i start the engine , open the hatch to take a last visual everything sounds and looks good with engine idling and leave the dock . before giving full power i in any case wait for reaching operating temps even considering the oil needs longer to warm up - so first 10-15 minutes after leaving the dock only cocktail speeds .

    i never fully warm waiting at the dock but guys with a carbed engine wich tends to stall cold may need another procedure
     
  14. Little Ducky

    Little Ducky Active Member

    594
    Jun 5, 2017
    Chattanooga TN/Dickson TN
    1998 SeaRay 290 Sundancer
    Twin EFI 5.0L w/Alpha 1 drives
    For me it just depends if the dock is busy of not.

    I'm on a dock with mostly ski and pontoon boats so when no one is around I may let the boat idle a little more while parked other wise I start and allow them to idle while I untie and disconnect and then putt out of the marina. I smoke a bit on start up when the boat sits for a week or so so I don't want to be annoying to other boaters.

    If I was located on a dock with other cruiser boats I probably would change it up a little to avoid CO problems with neighboring boaters.
     
  15. Creekwood

    Creekwood Well-Known Member GOLD Sponsor

    Apr 26, 2009
    Oakville and Georgian Bay, Ontario
    '97 330 Sundancer
    2X 454 w/ vDrives
    OMG. I thought the miserable mile in Cape Coral was intolerable. I can't imagine 7 miles of no wake to just get on the real water.
     
  16. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    The miserable mile in Cape Coral gives us PLENTY of warmup time!! LOL!

    With 10 gallons of oil each, our warmup time is long anyway. My oil temps under load are around 225, and I don't go above 1000 RPM until I get to 180.
     

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