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  1. #1
    Rear Admiral JasonJ's Avatar
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    Default Torque specs for Mercuiser 470

    Yeah I know "needs a service manual", but it isn't my boat, and the owner doesn't want to drop the green, so here is where I am at:I am putting new piston rings and bearings in a Mercuiser 470 Serial 5293750 (1979). What I am hoping to get is:Connecting rod bolt torqueHead bolt torqueRing gap (standard ring size)Intake bolt torqueOil Pan bolt torqueRocker cover bolt torqueMain Bearing bolt torque (I took caps off to check main bearings, they were fine)Exhaust elbow bolt torqueAny help is appreciated (Thank God I have manuals for my stuff)...

  2. #2
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    Default Re: Torque specs for Mercuiser 470

    Dont do this engine without a Factory Manual!! You do the heads you need the tools. Too many things to screw up on this engine.

  3. #3
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    Default Re: Torque specs for Mercuiser 470

    Connecting rod bolt torque - 40 flbsHead bolt torque - 130 flbsRing gap (standard ring size)Intake bolt torque - 35 flbsOil Pan bolt torque - 150 ilbsRocker cover bolt torque - 90 ilbs Main Bearing bolt torque (I took caps off to check main bearings, they were fine) - 55 flbsExhaust elbow bolt torque - 25 flbs

  4. #4
    Rear Admiral JasonJ's Avatar
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    Default Re: Torque specs for Mercuiser 470

    Trent, I am not doing anything to the head. Realistically the whole thing should get a proper rebuild, but the owner doesn't want to put too much green into it, its not my call. I am just replacing the offending parts (#2 cylinder w/broken rings and #3 and #4 bad rod bearings). Everything else is fine.Thanx for the info Jolly, do you not have the ring gap spec?

  5. #5
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    Default Re: Torque specs for Mercuiser 470

    Ok just so you know........Ring gap: Top .010-.020 2nd .010-.020Oil Ring= .010-.025

  6. #6
    Rear Admiral JasonJ's Avatar
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    Default Re: Torque specs for Mercuiser 470

    Thanx Trent...

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