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  1. Eric 3.7LX Alpha 1

    Boat running bad!!!!... Won't hit full rpms!!!!...

    Re: Boat running bad!!!!... Won't hit full rpms!!!!... Here is a pic of the Craftsman advanced light I have, which is a dinosaur. The new digital ones today also display engine RPM. With the advanced light you just need the 0? mark. Turn the knob till the timing mark is at Zero and your...
  2. Eric 3.7LX Alpha 1

    What oil to use

    Re: What oil to use There is the page from the service manual. The answer.... It depends on the ambient temp. your boating in. I myself have been using SAE 30W oil... you should need about 5?-quarts. I change it every season, and have never had an issue, motor has never blown up and never...
  3. Eric 3.7LX Alpha 1

    NOAA live video stream of Northeast Canyons Expedition 2013

    Just found this and figured I'd share for anyone interested in it. Hopefull it'll be good: Okeanos Explorer | Expeditions | Northeast U.S. Canyons Expedition 2013 | Background Essays | Mission Intro Here is a live video feed of the ROV for anyone interested: NOAA Ocean Explorer: NOAA Ship...
  4. Eric 3.7LX Alpha 1

    Wiring Diagram for motor trim solenoid

    Re: Wiring Diagram for Mercruiser 470, and motor trim solenoid wiring Re: Wiring Diagram for Mercruiser 470, and motor trim solenoid wiring Welcome Dave... We will definitely help you get that 470 running.... but you have to start your OWN thread and not jump on another older one. From the...
  5. Eric 3.7LX Alpha 1

    Links for winterizing a Mercruiser 470.

    Re: Links for winterizing a Mercruiser 470. In a nut shell:
  6. Eric 3.7LX Alpha 1

    t-stat problems

    Re: t-stat problems Here is the diagram for the "new design" all part numbers are Mercruiser: Here is the diagram for the "old design" all part numbers are Mercruiser: from here: https://webapps.brunswick.com/literature/literatureUnsecureHrp.do You have the correct thermostat: The Sierra...
  7. Eric 3.7LX Alpha 1

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

    Re: Changed Plug wires and distro cap - now boat will not start If the distributor cap has "male" pointed ends like the spark plugs do.... then I would think the wires could be swapped backwards without issue. Both ends of the wires would have the same type of boot. If the distributor has...
  8. Eric 3.7LX Alpha 1

    outdrive ratio question

    Re: outdrive ratio question Not that close in ratio:
  9. Eric 3.7LX Alpha 1

    mercruiser 3.0 140hp no top end speed and dead spot whil accelerating!!!!!....

    Re: mercruiser 3.0 140hp no top end speed and dead spot whil accelerating!!!!!.... If your refeering to the Quad gasket it is how gear lube travels between the halves of the drive, fill the lower till it comes out the upper vent hole..... it travels only thru this opening.
  10. Eric 3.7LX Alpha 1

    my first boat and I need some help

    Re: my first boat and I need some help There is a grease fitting (zerk) on the starboard side of the gimbal housing (outside the boat) at approximately the 4 O'clock position. Some newer gimbal bearings are sealed units and you can not grease them. I like to grease it while the drive is...
  11. Eric 3.7LX Alpha 1

    470 mercuiser won't start. Cranks but will not fire.

    Re: 470 mercuiser won't start. Cranks but will not fire. When you check the coil for voltage at the (+) terminal the black test lead goes to ground on the block somewhere.... and not (-) of the coil. Every test meter is different but you want to have it set to read DC volts. If there are...
  12. Eric 3.7LX Alpha 1

    470 weep hole

    Re: 470 weep hole How's this ;)
  13. Eric 3.7LX Alpha 1

    need help to determine what out drive i have

    Re: need help to determine what out drive i have It does look like a MC-1, lift ring on top cap, and rounded corners on the excavation plate. The link from the "sticky" says "1-R" for that year. Your ratio will/should be 1.50:1. New models have 1.47:1 which is close enough. There could very...
  14. Eric 3.7LX Alpha 1

    1987 mercruiser 470-170hp water pump replace ? maybe 1986 eng in 87 boat

    Re: 1987 mercruiser 470-170hp water pump replace ? maybe 1986 eng in 87 boat Sorry to hear about the gears in the upper unit. The impeller is in the lower half of the outdrive, Here's a video Achris made for your viewing pleasure ;)
  15. Eric 3.7LX Alpha 1

    upgrade from 3.7 to 4.3; same drive???

    Re: upgrade from 3.7 to 4.3; same drive??? Have a look at this chart with the drive ratio for each engine: (taken from the "Adults Only Sticky at the beginning of this forum) ;)
  16. Eric 3.7LX Alpha 1

    What have I done? Gear oil leaking out before level reaches vent hole

    Re: What have I done? Gear oil leaking out before level reaches vent hole The quad ring gasket may have moved outta place or altogether.
  17. Eric 3.7LX Alpha 1

    Lower/out drive shift cable froze

    Re: Lower/out drive shift cable froze That's the spot to cut the cable... Look at Ziggy's photo of the shift shaft. That is what you want to turn with the screwdriver so it is straight the prop should be able to lock CCW (while looking at the bow)... if so your drive is in forward and ready...
  18. Eric 3.7LX Alpha 1

    1987 mercruiser 470-170hp water pump replace ? maybe 1986 eng in 87 boat

    Re: 1987 mercruiser 470-170hp water pump replace ? maybe 1986 eng in 87 boat Oh my boy there is a weep hole and you have a nice weekend project ahead of yourself... The engine circulating pump is 99% never the issue. You have a seawater pump in the drive that must be religiously maintained as...
  19. Eric 3.7LX Alpha 1

    1977 Mercruiser 470 Problems - Please Help

    Re: 1977 Mercruiser 470 Problems - Please Help Welcome to the forum!! There is a wiring schematic for the single solenoid set up. If you want to test just the trim motor to see if it works, then use a jumper wire to the (+) on the battery to either the green or blue wires to the motor itself...
  20. Eric 3.7LX Alpha 1

    Mercruiser 3.7/470 coil resistance wire question.

    Re: Mercruiser 3.7/470 coil resistance wire question. the wire run between the choke and the coil should be the resistance wire, the other wire will be the ignition wire to power both. The choke must be grounded by touching the engine and doesn't have the black wire in yours... think mine as...
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