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  1. #1
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    150 mercury rods

    OK here I go trying to put together 1987 RX 2 mercury that somebody else took a part I will have to replace 2 port side piston I need to know doe's it matter which way the rod is turn on the piston I tried to find a video on utube with no luck found one about OMC they have a oil hole that points to top of engine I did not see one on the mercury I know the rod cap goes a certain way got that down pat the rods have already been taking off so that reason I ask OK on another motor I have 79 150 mercury with a bad block and I have a 86 2.0 mercury I need to know if I can take the crank & rods piston reed value carb's and make it run again OK on another matter I'm going to use Wiseco piston that's all I have my 87 motor is all ready bore out .20 over I'm going carry it to a machine shop to check the clearance Wiseco said to bore it to 3.145 there piston already has the clearance build in I've heard alot of bad stuff about Wiseco piston do I add more clearance or trust them it just a old fishing boat not going to race it or anything just want it last THANKS a bunch jake150
    Last edited by jake 150; 01-20-2019 at 10:49 AM.

  2. #2
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    No...i put them in numbers up.

  3. Thanks jake 150 thanked for this post
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  4. #3
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    X2 ^

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  5. Thanks jake 150 thanked for this post
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  6. #4
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    Welcome to the site. Rods probably don't matter but I put them in numbers up also. Add at least .001 to .0015 extra to those Wiseco. Good luck.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

  7. Thanks jake 150 thanked for this post
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  8. #5
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    Brookeland , Texas 75931 North of Jasper
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    Just to stay uniform I build ALL my motors with rod numbers up .Just a habit ,not nessary but just as simple to put everything uniform , I’m anal about things Like that..

    BTW I choose NOT run forged pistons in any steel sleeved blocks I build , I like cast pistons going back in a steel bored motors (Like your OEM motor came) been building these for 20+ years doing these seems for ever I’ve learned many lessons most the HARD way , but that’s one lesson I’ve learned , with cast on steel you have a 100% chance of success, forged on steel is IMO a crap shoot , also on a 2.5 sized bore you must add .003” to use forged pistons on the steel sleeve bore size ...

    JMO
    Last edited by Jay Smith; 01-20-2019 at 04:52 PM.
    Jay @ JSRE

  9. Thanks jake 150 thanked for this post
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  10. #6
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    I wouldn't run Wisecos in that build. I would order some cast from WSM or Pro Marine. I'd run the block, tuner, and carbs from the XR2, the crank, rods, and other parts from the '79 will work fine. I would set up the electrics like the '79 was but use the stator from the XR2 or the 86 if you have it. The 79 was 9 amp and the later motors are 16 amp. If you don't have the adapter plate from the XR2 use the 86 plate (79 won't work) and get a 2.4 200 or a Bob's exhaust tuner. The XR2 carbs should be WH-29's. The other motors you have will probably have small bore carbs. Maybe make a list of the parts you're planning to use...

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  12. #7
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    Thanks everybody been a big help
    Last edited by jake 150; 01-20-2019 at 04:26 PM.

  13. #8
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    What's your opinion on GLM PISTON I'M TAKING YOUR ADVISE ON MY MERCURY BUILD FOUNDED SOME GLM piston at a good price

  14. #9
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    We call them good luck marine, wsm or pro marine best bet

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  16. #10
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    ive used them on a few rebuilds when they were trying to get me to be a distributer mainly for the lower unit parts when thats all i did many many years ago they r ok but i prefer pro on my rebuilds i remember when wsm had that very same handle and u could buy a rebuild kit for under 500

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  18. #11
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    I’ve had great luck with the mid grade Pro Marine cast pistons in steel sleeved engines , I am setting up an account with the WSM folks as I type , never used their parts but friends have had good luck with them .
    Only time will tell ,
    Jay
    Jay @ JSRE

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  20. #12
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    I used Wisecos in many v4 and v6 OMCs. As stated, 2-3 thousandths extra clearance and I would tie them to the dock and let them idle in gear for 45-60 minutes before running them. Didn't have any failures using this method, but I stuck a couple treating them like cast pistons on break-in.
    18 Talon/2.4 carb SOLD
    26 Deck Boat/250 Merc

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