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Mercruiser 3.7 Build, 1970 Cj5? Part 2, Fab And Adapting!

Discussion in 'Builds and Fabricators Forum' started by 70cj5134f, Oct 20, 2018.

  1. Nov 14, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
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    749
    I've benn cleaning bolt holes, and fileing the flash and burrs off the deck
    Today for a couple hours.hope to have ready for assembly to begin by weekend?

    Talked to a local race engine builder today, he works at Napa.
    Showed him the original gasket to c if they could order,no luck.
    He said the printoseal bead on the gasket was teflon based.
    Wonder bout hydraulic teflon sealer to make my own bead?

    Made with teflon, pure white thread lubricant and sealant. Non-hardening. Withstands up to 10,000 psi and temperatures from -100 degrees F to +600 degrees F. Apply to clean male pipe threads on metals.
    Just a thoight? 1542233351649298423667.jpg
     
  2. Nov 14, 2018
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
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  3. Nov 14, 2018
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    The Victor Mahle gasket kit is aftermarket. It may be name-brand, but its not OEM Mercury Marine/Quicksilver. Just because you buy parts from a marine dealer doesn't make it OEM. If you go to a Mercury/Mercruiser dealer, you can get OEM, and probably aftermarket like Mahle or Sierra too. The label will be branded Mercury or Quicksilver for OEM, not just the Mercury part number, which, by the way is #13709 (may also have a "T" at the end).
    Added sealers are not going to make an auomotive gasket work properly. Look at a picture of the deck of a Ford 460 and the deck of your 3.7. The 460 deck is nearly a mirror image of the head surface, and looks nothing like your open deck 3.7.
    Use what you want, but only the Mercury gasket was designed for sealing that block!
    -Donny
     
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  4. Nov 15, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Well I WANT the correct gasket, just pisses me off that they sell incorrect
    Gaskets and expect us to to be ok with it!
    I'm still undecided on what to do?
    Again it ant about the money.
    Part of me wants to just bend and order the correct one?
    But the hillbilly engineer in me wants to figure out a way to use the victor gasket?
    Am I right on this,the one that came off my engine is still not correct?
    Or is it just a generic copy of the oem?
    All holes in it match the victor, except it has 3, 1/8in holes between the cylinders?
     
  5. Nov 15, 2018
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Its about where the rubbery sealing beads are located on the gasket. The OEM gasket locates sealing beads that line up with the thin edges of the block deck. I have picked up the correct gaskets off eBay for $30-$45 delivered. They come up for realistic prices fairly frequently.
    Your gasket that came off your engine looks like a premium automotive gasket. Look at the compressed areas on the block side of the used gasket and see how it lines up with the sealing beads. The OEM gasket has long straight beads that follow the thin edges.
    -Donny
     
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  6. Nov 15, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Thanks.
    I've ordered one,44$.
    And I c the back side has beads around water ports and long bead down sides.
    Still prepping block, bout done.
    Donmie, is this the right manual I got?
    It's not for the first timer,lol.
    No step by step assembly.
    It does have all the necessary info, tq specs,and some pics that help.
    Usually all my factory manuals are Way better than this. 15423159097811026239542.jpg
     
  7. Nov 17, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
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    Crank in,tq 55 ftlb, rear bearing cap seal, new to me.
    2 rubber square inserts, then a drive pin.
    Mercruiser sealant pint, 16$
    Use on rubber inserts, and bearing cap to block ,steel to alum.
    Still cleaning pistons, 2 top rings still stuck, trying gun bore cleaner now, it's a carbon solvent.
    Already soaked in atf/brake fluid/FI cleaner mix over 2 weeks?
    All free and clean except for 2.
    1542474006855605709930.jpg 1542474050579864405362.jpg
     
  8. Nov 17, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
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    1 installed.
    1 ready to ring.
    And 2 with top ring still stuck, their moving slowly, but with time and soak they will come off and clean. The bore cleaner made it easier to scrape with broken ring, the final few carbon spots .
    Zero deck height trial came close,can just barely get a sheet of thin paper in. Had .028 took off.
    15424944069641302575076.jpg
     
  9. Nov 19, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Aug 18, 2018
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    Gasket arrived. Looks more desighened for this open top alum block. 1542646526184450229734.jpg 1542646564538659394426.jpg
    Finaly got that last stuck ring off, last slug going in tonight
     
  10. Nov 19, 2018
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Sorry to say, but that's not the correct head gasket. The one you have pictured is for a Ford 460 car engine with the solid/close deck block.
    All those oval sealing beads on your gasket fall into the open deck of the marine engine. The correct gasket has a continuous sealing bead from one end to the other on the pushrod side, and 4 cresent shaped beads along the other side.
    PM me an email address so I can send you a photo of the correct gasket.
    -Donny
     
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  11. Nov 19, 2018
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
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    Dang I wish I could help find some link of the right gasket, this is frustrating to read.
    I want to hear this thing at idle.
     
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  12. Nov 19, 2018
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

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  13. Nov 19, 2018
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Bingo on the first link, "NIB Mercruiser 3.7...". That is the correct gasket with the sealing beads running the full length, and $78.48, ouch!
    The second blue gasket is an automotive version for the Ford 460, not acceptable for the Mercruiser engine.
    -Donny
     
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  14. Nov 20, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    So now I got 4 incorrect Gaskets, damn!
    Maybe I can stack them all, and 1 will seal,lol.

    Ant buying another, at least not until I try these?
    I'll be the pig. Going to try the last one I got first.
    Pulling this head is an easy job if it fails.

    Head due back from mach shop Wednesday.
    Got my lifters yesterday, 302 Ford.
    Got my chain, BBC non tru roller.
    Local speed shop , had them in stock.
    Tonight hopefully, cam install, and speedy sleeve repair.
     
  15. Nov 20, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Donny, when these gaskets fail, what and where do they leak?
    External oil, or water?
    Or is it internal?
    The bead placement on the nib gasket looks to prevent external leaks?
     
  16. Nov 20, 2018
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    An old Jeep guy once said: " Do it once, do it right the first time."
    I don't know who that was.....
     
  17. Nov 20, 2018
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
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    Put all four up on eBay to pay for the right one.
     
  18. Nov 20, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Oil pump and pickup installed.
    I ascribed the block before oil pump removal.
    Supposed to have a line up tool, I used scribe marks and I installed distributor for alignment.
    Used locktite on pickup coupling and tube to block nuts.
    Packed pump with grease when blueprinting.
    Keyway in crank lines up with cam for chain install.
    Chain didn't fit sprocket, using old one, it has a tensioner.
    15427325150121414590095.jpg
     
  19. Nov 20, 2018
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    The main leak is coolant gets into the oil. You're going to do what you want, but don't say you weren't warned!
    -Donny
     
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  20. Nov 20, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Yes I'm warned. Gotta try it though.

    Cam repair sleeve, first one installed.
    Had cam turned down from .871 to .862, so I could use the next smaller size than recommended by boat forums.
    Eaiser than i had read about.
    Let sleve warm on wood stove 20 min , applied Perfect Seal to shaft where sleeve sets,
    Drove on with light taps of hammer.
    These generic ones were bout 32$(pr) shipped, vs 20-30$ ea ,for brand name.
    After sealer sets I'll cut,and, rip shoulder of sleeve off, as per instructions.
    15427450572921796814671.jpg
     
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