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  1. alldodge

    5.7 mercruiser 1988 engine runs fine to working temp

    Re: 5.7 mercruiser 1988 engine runs fine to working temp As hivoltg mentioned, when the engine starts to die, you can engage the starter and it will continue to run?? Or did we miss something? What is this all 4 barrels are open sucking WATER You should be able to find the S/N on the...
  2. alldodge

    I/O newbie: Mercruiser 140 exhaust

    Re: I/O newbie: Mercruiser 140 exhaust To add a little bit to 81 Checkmate, below is the pic of your outdrive. Item 17 is the main exhaust bellows which takes it through the prop hub. The larger one covers your u-joints and drive shaft. Since condition is unknown, Recommed pulling the...
  3. alldodge

    385HP 454 Rod Knocking

    Re: 385HP 454 Rod Knocking Got around to taking the motor apart today and found: Engine has a Mrcruiser Repower plate on the side Head and Rocker stud bolts have what appears to be white silicone on the ends. Heads look good with no signs of preignition, only one cylinder shows slight sign of...
  4. alldodge

    Carbureted 7.4 dies after cruise, fine at slow speed

    Re: Carbureted 7.4 dies after cruise, fine at slow speed According to the serial number it is a 95 454 MAG (821723 92 - 7.4L 454 MAG BRAVO GEN V ) , go figure. That being said you need to test your fuel pump. Also if you haven't done it check the gear lube inside the section between the...
  5. alldodge

    Changed Plug wires and distro cap - now boat will not start

    Re: Changed Plug wires and distro cap - now boat will not start Sounding like there is a loose connection somewhere. Moving plug wires around should do noting except make it run bad if they become out of order. So I take it the engine is now running but may need to set idle?
  6. alldodge

    1997 5.7L Merc EFI turns over but no spark. HELP!

    Re: 1997 5.7L Merc EFI turns over but no spark. HELP! In you previous thread you indicated that this was a salt water engine which sat for over a year and you took it on as a project. Also you had it out and water was spraying everywhere. Did you replace the engine with a new one? Have you...
  7. alldodge

    1977 Mercruiser 235 Dies

    Re: 1977 Mercruiser 235 Dies Here is what I know. The shift interuptor switch is usually locaked on a plate attached to the exhaust riser. It will have two cables located their and a switch plate and switch. The interuptor switch, interupts the engine spark to unload the drive so shifting...
  8. alldodge

    Power Tilt System Leak

    Re: Power Tilt System Leak No, remove item 32 in the pic and will need to replace the gasket item 31. All done fromthe outside. Spray with PB blaster and such.
  9. alldodge

    motor dies in reverse

    Re: motor dies in reverse If the motor is turning over in reverse you bypassed the netural safety switch. Shift interuptor is on the shift plate where the throttle cable and shift cables are located. Item 18 is the shift interuptor for this engine. BTW I don't know what year, type or...
  10. alldodge

    1991 mercruiser 3.0 w Delco Est, ignition issue

    Re: 1991 mercruiser 3.0 w Delco Est, ignition issue Welcome to the forum Here is the 3.0 wiring schematic Check for 12V at the coil on the + side, pull the plug wires off and see if you get spark...
  11. alldodge

    Mercruiser 3.0 Electrical problem

    Re: Mercruiser 3.0 Electrical problem SOunds like you know how to trace connections and something does look off in your pics, more so becauase this is a 20002 setup. Trace the connections from the starter RED wire throught the RED/PUR through until you find the break
  12. alldodge

    No spark when warm

    Re: No spark when warm It would help to know the year of the 5.7, a serial number works good. If the engine will crank there are no switches down stream so to speak to stop the spark. The oil pressure switch will not stop you from starting. You mention Thunderbolt IV so here is the trouble...
  13. alldodge

    Need Correct Fuel Filter

    Re: Need Correct Fuel Filter Not knowing what year your boat is I'll guess that it looks like this 87-89 3.0 The part number for the kit is 35-49088Q2
  14. alldodge

    What is the tollerance on a V-drive prop shaft

    Posted this in the non-engine and received nothing, then figured it deals with a Merc motor and velvet drive so maybe it should go here Buddy has a 99 Maxium 3700 and when they pulled it out the port side prop shaft was sitting on the bunk between the hull and the strut. It was put back in...
  15. alldodge

    V-Drive prop shaft Tollerance

    Buddy has a 99 Maxium 3700 and when they pulled it out the port side prop shaft was sitting on the bunk between the hull and the strut. It was put back in, shifted and pulled back out. Put a dial indicator about a 13 inches from the hull and it showed .024 on the port side and .015 on the...
  16. alldodge

    82 searay 260 mercruiser having problem with coil and distributor getting fire

    Re: 82 searay 260 mercruiser having problem with coil and distributor getting fire Run it through this troubleshhoting process and see what comes out
  17. alldodge

    Mercruiser 3.0 not starting/ no spark

    Re: Mercruiser 3.0 not starting/ no spark Don't know if you you have a thunderbolt 4 or 5 ignition so I'll give you both. Run through this and see where it takes you
  18. alldodge

    Bilge pump wiring

    Re: Bilge pump wiring The bildge should be connected direct from the battery and through a float switch back to ground. Most bildges have a secondary connection to a switch where the pump can be turned on from the dash. The foot pedal thing is the float switch. Here is a pic, have a look and...
  19. alldodge

    Exhaust manifolds and risers water line upgrade help

    Re: Exhaust manifolds and risers water line upgrade help This is more of a puzzler then first thought and I'm glad you looked further into it. New exhaust circulation systems receive water into the top of Thermostat (TS) housing which passes through to the engin water pump and to exhaust...
  20. alldodge

    Running hot at low speed

    Re: Running hot at low speed Looks like quite a bit of rust in the channels, try to verify there is no other scale build up or restriction. The gasket is the wrong type, it should seal off water from entering exhaust gases. See item 3 Hope this is what item 1 is above The cooling system...
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