User Tag List

Results 1 to 8 of 8
  1. #1
    Join Date
    Apr 2018
    Location
    Titusville Florida
    Posts
    99
    Thanks (Given)
    0
    Thanks (Received)
    2
    Likes (Given)
    0
    Likes (Received)
    6
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Is there a way to verify a 1991 Mercury Oil Injection Pump & System working properly?

    I transferred a 1991 Mercury 2.4 liter XR4 150 from one bass boat to another. I had to disconnect the oil injection line and transfer the boat mounted tank to the new boat then reconnect everything. The oil line to the fitting that fills the motor mounted tank is connected. The line that goes to the bottom of the block with the brass fitting is connected - I assume this is what provides the air pressure to force oil to the motor mounted tank. I am so afraid that something might be wrong, or it might take a bit for the oil system to start working again properly that I mixed the gas in the gas tank 50:1 with oil. And it’s a good thing I did because it didn't hardly smoke at all the first 2 minutes I ran the engine, but then the smoke definitely seemed to get heavier after about 2 minutes. So I am fine for this tank of gas. But is there a way to verify that the oil pump is properly injecting oil for the next tank of gas?

    Thank you

  2. #2
    Join Date
    Mar 2008
    Location
    Tourist Trap, Florida
    Posts
    14,700
    Thanks (Given)
    380
    Thanks (Received)
    1280
    Likes (Given)
    5599
    Likes (Received)
    10931
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    With oiled fuel going to engine, disconnect oil feed hose from vst.and plug the nipple. Disconnect link arm from oil pump. With engine running at idle observe the oil coming out of pump with pump arm in idle position and then advanced to wot position. Should be a big increase at the wot position. Merc has a measurement of oil per minute for this in the manual. But the increase in the amount of oil will verify it is working.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  3. #3
    Join Date
    Sep 2001
    Location
    Pekin, IL
    Posts
    9,770
    Thanks (Given)
    502
    Thanks (Received)
    700
    Likes (Given)
    2816
    Likes (Received)
    4463
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Verification of a working system is a great idea. Problem is there is no way to verify the condition of that plastic 18 year old drive gear and with Mercury's reputation for gear failure I think I would rather just disco entire system and safely premix. When that gear fails it gets really expensive and I have sure seen a lot of torn up gears. JMO

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

  4. Likes XstreamVking, Dave Strong liked this post
  5. #4
    Join Date
    Apr 2018
    Location
    Titusville Florida
    Posts
    99
    Thanks (Given)
    0
    Thanks (Received)
    2
    Likes (Given)
    0
    Likes (Received)
    6
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thank you for the replies.

    To XstreamVking: Is the vst the vapor separator tank? Isn't that on Merc's EFI engines? Mine is a carburetor motor. How would that change the instructions you gave?

    To Rock: That plastic drive gear is 28 years old, not 18 years old. So it gets better with age, right? (Attempt at humor) I will probably disable the oil injection at some point. But I would have to buy the kit and install it. For the rest of the summer I would like to verify the oil injection and use it the rest of the summer.

  6. #5
    Join Date
    Mar 2008
    Location
    Tourist Trap, Florida
    Posts
    14,700
    Thanks (Given)
    380
    Thanks (Received)
    1280
    Likes (Given)
    5599
    Likes (Received)
    10931
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Yes, my mistake. No vst. It would flow to all the carbs with tubing. Nothing really changes.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  7. #6
    Join Date
    Sep 2001
    Location
    Pekin, IL
    Posts
    9,770
    Thanks (Given)
    502
    Thanks (Received)
    700
    Likes (Given)
    2816
    Likes (Received)
    4463
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    And I thought I was good at math. Musta been too early.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

  8. #7
    Join Date
    Sep 2006
    Location
    Minnesota
    Posts
    5,543
    Thanks (Given)
    0
    Thanks (Received)
    35
    Likes (Given)
    0
    Likes (Received)
    96
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Doesn't that have a 1 pint or so tank on the engine that the boat tank replenishes? The engine tank has a sensor on the cap that trips the oil alert alarm if the level in the tank drops at all from plumb full. The injection pump draws from the engine tank.

    Setup is to loosen the cap on the engine tank and idle the engine until it starts to overflow, then quickly tighten the cap. If you suck a little oil out of that tank, and idle the engine, you should see it fill back up. Disconnect the wires to the cap to test the low oil alarm.

    The oil pump has a sensor on the shaft that will trip the alarm if the signal disappears. disconnect that connector to test the alarm.

    From there, if you hear the POST beeps when you turn on the ignition switch, yer golden till something breaks.

    I usually mix about an ounce of oil per gallon in the fuel tank for emergency lube. I also use synthetic oil to buy a few seconds of grace if something breaks.

    BTW, the gear usually hangs in there as long as the oil pump turns freely. All bets are off when the oil pump shaft bushing swells up and binds it. That's the part worth replacing every 10 years or so.
    To fish or not to fish? What a STUPID question.

  9. #8
    Join Date
    Feb 2013
    Location
    Northern Cal
    Posts
    190
    Thanks (Given)
    0
    Thanks (Received)
    18
    Likes (Given)
    8
    Likes (Received)
    37
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bumblebee Here's some info on oil ratio mixing for a 200 Merc EFI which will not match your 150 but give you some idea . I did the math on oil required but haven't double checked anything yet .

    Idle 700 rpm 1.3 gal per hour fuel 80:1 oil =2 oz oil
    1000 rpm 2.1 gal per hour fuel 70:1 oil = 3.84 oz oil
    2500 rpm 9 gal per hour fuel 60:1 oil = 19.2 oz oil
    3500 rpm 15 gal per hour fuel 50:1 oil = 38.4 oz oil
    4500 rpm 18 gal per hour fuel 50: 1 oil = 46 oz oil
    5500 rpm 21 gal per hour fuel 50:1 oil = 53.76 oz oil

    Your 150 should burn something slightly over 15 gal per hour at WOT ( figure 1 gal per 10 HP , per hour @ WOT)

Similar Threads

  1. How can I verify oil injection is operable on a 200EFI
    By mragu in forum Technical Discussion
    Replies: 2
    Last Post: 06-26-2014, 06:21 AM
  2. OMC Tech: Evinrude Tachometer Not Working Properly
    By low tide in forum Technical Discussion
    Replies: 3
    Last Post: 05-08-2012, 10:01 AM
  3. RPM Gauge Working Properly?
    By fretmonger in forum Technical Discussion
    Replies: 3
    Last Post: 09-19-2006, 05:21 AM
  4. Is my TPI working properly?
    By iammarcuse in forum Technical Discussion
    Replies: 5
    Last Post: 09-20-2005, 07:39 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Frank Mole Transport