Engine tune up?

Discussion in 'Mechanic Recommendation Forum' started by Yorkshirelad, Jul 8, 2018.

  1. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    I headed out yesterday to a local anchorage and my old girl ran great (2 454,s 7.4 340 hp. But on the way back they ran fine cruising at 1500 rpm hull speed, but when I increased the rpms to get her on a plane 2800 to 3200 she started to miss like she was going to quit. I dropped back down to cruising speed and they ran fine again. On returning to the marina I booked her in for a tune, hope is a simple fix and not a valve or something, any ideas guys?
    Cheers Rob
     
  2. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    A tune could help but it sounds more like a failing fuel pump.
     
  3. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    I purchased the boat last fall and had all the fluids changed out, but in the spring I didn’t have a tune up. The previous owner didn’t have records, so I changed out the stuffing box packing and the impellers. I’m going to speak with the service manager tomorrow.
     
  4. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    I had same thing. It was a fuel pump. I replaced it with non OEM and it failed a few months later. I was in an area where I got another non OEM. It also failed. I replaced it with OEM been a couple of years it works fine. If it is on the port engine it is easy to change if it is starboard it is a bear. If on the engine there is a push rod that makes the fuel pump work. Pry it up and pack the area solid with wheel bearing grease to hold the push rod up.
     
  5. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    Thanks for the input guys!
     
  6. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 Express
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin GSD 22 Sounder
    Garm
    454 Crusaders
    Are you saying BOTH engines acted up at the same time? I assume your boat has 2 fuel tanks and each is running on it's own fuel tank. If that is the case it would be very odd that BOTH engines would act up at the same time. Since the boat is new to you and you have little insight I am suspecting bad fuel. Try hooking up a small 6 gallon fuel tank to the fuel pump to see if the problem goes away.
     
  7. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    Hi Hottoddie,
    I am suspecting the Starboard engine.
     
  8. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    The problem solved!
    Part of the electronic ignition is shorting out to the pole. The marina mechanic is going to service the boat on Monday.
     
    Little Ducky likes this.
  9. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Chattanooga TN/Dickson TN
    1998 SeaRay 290 Sundancer
    Twin EFI 5.0L w/Alpha 1 drives
    Help me with what "The Pole" is. Thanks
     
  10. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    I hope you are correct but did the 'mechanic' diagnose the problem over the phone or was he physically at the boat?.....what 'pole' is he referring to and what part of the ignition system is shorting out?

    cliff
     
  11. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    I have electronic ignition, he started the engines and noticed the condenser on the ignition was sparking on the starboard engine, he said the new ones are insulated, he changes out about 10 a season. Wires are good I asked him to change out the plugs because most of my cruising is at hull speed.
     
  12. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    great....I hope this solves the issue....

    good luck...

    cliff
     
  13. BillK2632

    BillK2632 Well-Known Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    Sounds like he is talking about the ignition sensor. The older style is open and tends to develop problems from corrosion etc, the new ones are sealed.
     
  14. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    don't think so....this is a 1986 boat.....probably has ignition points and condenser....

    cliff
     
  15. BillK2632

    BillK2632 Well-Known Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    Good point, he said electronic ignition but did also say condenser...
     
  16. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    I think some of the conversion kits to electronic ignition still used a condenser but could be wrong....that's been a longgggg time ago when I was messing with points....

    cliff
     
  17. Yorkshirelad

    Yorkshirelad Member

    45
    Oct 21, 2017
    340 Searay 86
    454 Mercruisers with v drives
    Ray-marine radar and gps
    454 mercruisers
    Update! Problems fixed, tuned up both engines bad wires on the starboard engine, changed out both slave solenoids.
    Has electronic ignition!
     

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