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  1. M

    '84 Merc 150 V6 - Is my block destroyed?

    Re: '84 Merc 150 V6 - Is my block destroyed? It's a hairline scratch, not a crack. It's really small. You can see it real well in the pic because the sun hits it just right. If not for that I might not have even seen it. I see it pretty clearly in the pic. It's almost @ 9:00 and goes across...
  2. M

    '84 Merc 150 V6 - Is my block destroyed?

    It's taken some time but I've finally got my block back from the machine shop. It's bored .030 over on all cylinders. The machine shop indicated no problems. While cleaning the surfaces that the heads bolt onto, I noticed a small scratch. Does this render my block destroyed?
  3. M

    '84 Merc 150 - V6 2.0 - Frozen Bolt - Can't Get It Loose

    Well, I've made a mess. I had a head bolt that snapped off. I got the other bolts out & got the head off. About a 1/2" nub of the bolt was sticking out. I grabbed it with a small pipe wrench. I had great control and was very careful. I sheared it off just about flush with the head. I...
  4. M

    '84 Merc 150 - V6 2.0 - can't get powerhead off.

    Re: '84 Merc 150 - V6 2.0 - can't get powerhead off. Thanks very much for the help & the pics. I learned a trick that worked. Hopefully the pic will explain it. I did get it to pop loose & had about a 1/4" gap between the powerhead and the midsection. 3 of us tried to pick it up off the boat...
  5. M

    '84 Merc 150 - V6 2.0 - can't get powerhead off.

    I've got 10 9/16" nuts pulled off the powerhead. The 2 in the front aren't all the way off because I have to nudge the powerhead off the mid section far enough for the nut to slip out. As far as I can tell all 10 bolts are off (front 2 almost all the way off) but I can't so much as budge the...
  6. M

    '84 Merc 150 - throttle linkage problem

    1984 Mercury Black Max XR2 Serial number: 6532700 I've been working on the timing on my motor and got it running like a top today. After some time I was unable to get it up to speed to plane out. I could idle and could get it just to the point where it should level out and take off but it...
  7. M

    '84 Merc 150 - how do I adjust timing?

    Re: '84 Merc 150 - how do I adjust timing? OK, I've got the .462 figured out and I'm convinced that the timing mark is set correctly. Next I set the throttle cam and linkage so that the cam is not quite touching the throttle linkage roller. This sets the exact location of the throttle arm at...
  8. M

    '84 Merc 150 - how do I adjust timing?

    1984 Mercury Black Max 150 XR2 Serial Number: 6532700 I'm reading conflicting information in 2 different manuals. I can't figure out how to set the timing. I'm supposed to find .462 BTDC using a dial indicator and set the timing pointer to a mark on the flywheel at .462 BTDC. So, is .462 BTDC...
  9. M

    '84 Merc. 150 - what is idle RPM?

    I've got a Seloc manual that refers to the appendix but the only rpm I see there is 5K which might be a bit high for idle speed (sarcastic). The manual does not have an idle speed in the specs. I've looked and can't find an RPM for the idle on this motor: 1984 Mercury Black Max XR2 Serial...
  10. M

    '84 Merc. 150 doesn't crank.

    I've got a Mercury 150 XR2 Ser. #6532700 I ran this boat about 2 months ago and have been having trouble with it idling right but the starter was cranking just fine. Now it won't crank. I can hear the solenoid click and I tested voltage to the + lead on the starter. When I turn the key to...
  11. M

    How Do I Charge Aux. Batteries

    I've got an '84 Bass Nautique with a Mercury Black Max 150, 1984. I realize that the motor's stator => rectifier recharges the battery that starts the motor. I've got 2 aux. batteries that run the instrument panel and the trolling motor. They're wired in series to get 24 volts for the trolling...
  12. M

    Bass Boat - Trim - Planing Problems

    Re: Bass Boat - Trim - Planing Problems Thanks CharlieB. The carbs are Merccarb WH-27-(1, 2 & 3). I see hard plastic floats though which aren't supposed to be in this carb. I pulled off the carbs and dismantled them to a point. I found that the float on the top starboard carb barrel (the one...
  13. M

    Mercury Marine Outboard - Black Max- Serial Number Location

    I searched this site and quite a few others, trying to find the serial number for my engine. I found numerous different answers, none of which seemed to apply to my motor. I hunted all over the block and everywhere I could to find the serial number on my Mercury Black Max 150 XR2. I finally...
  14. M

    '84 Merc. 150 - Won't Crank Anymore

    Re: '84 Merc. 150 - Won't Crank Anymore well, I'd still like to know what that switch is but I did solve my problem. Once I was able to identify the starter solenoid, I was able to verify voltage to its control when I tried to crank. That means the solenoid is bad right? In this case, not...
  15. M

    '84 Merc. 150 - Won't Crank Anymore

    Re: '84 Merc. 150 - Won't Crank Anymore What is this switch? I'm really looking for the Neutral Start Switch that keeps the motor from starting when the drive isn't in neutral. I'm looking for anything that might have gone wrong. I'll try jumping the solenoid switch tomorrow and see if it...
  16. M

    '84 Merc. 150 - Won't Crank Anymore

    I'm working on my '84 Mercury Black Max 150 XR2. It's been running rough but started without TOO much trouble and if I could get it to plane it runs @ about 50 mph. I learned that I should do a de-carb procedure. But, before I learned that I disconnected the remote control wires expecting to...
  17. M

    '84 Merc. 150 - Low Compression - Now What?

    I've got a Mercury Black Max 150 XR2 that runs. I had trouble getting it up to speed on the water but once I did it ran over 50 mph. It ran that fast just last week. I started it again today with little difficulty. It doesn't like to idle and has a lot of trouble getting up to plane so I asked...
  18. M

    Bass Boat - Trim - Planing Problems

    I think I'm dealing with part lack of experience and part (the most part) faulty equipment. I've got a Bass Nautique w/ a Merc. Black Max 150 XR2 on it. When I first take off, I've got trim all the way down. The stern digs in and the bow shoots up. The motor does not rev up. As I move I pull...
  19. M

    Bass boat - planing problems or engine problems?

    Hi: I just got my Bass Nautique with a Merc. Black Max 150 XR2 in the water. Once I got it going it ran well. It's a fast boat. When I'm first trying to take off though, the stern digs into the water and the bow shoots up. The motor bogs and it won't take off. I'm not even sure how it finally...
  20. M

    My Merc BlackMax 150 XR2 won't start. Why?

    I bought a bass nautique with a Mercury BlackMax 150 XR2 about a month ago. When I bought it we took it out on a lake and it ran great. Now I can't get it to fire. It turns over but won't fire. I did add too much oil to the gas. The ratio is 50:1 gas:oil or 1 pint of oil to 6 gallons of gas...
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