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    Rusted Hole broke thru housing on I/O - Is it a water jacket?

    Mercruiser Pre-Alpha approx 1976..<br /><br />On the back of the upper housing just below the cap, a rust hole popped thru today.<br /><br />Saw rust mark from when the water dribbled down about an inch out of the hole.<br /><br />I'm trying to remember if this location is a water jacket inside...
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    Can't find post about something dropping inside I/O after plug removal.

    This is a Cobra I/O 351 Ford application:<br /><br />After searching the I/O forum I can't find the post about something dropping inside the outdrive when a certain plug was removed?<br /><br />I'm trying to remember if that post pertained to an OMC Cobra or Mercruiser outdrive?<br /><br />Does...
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    Gimbal Bearing vs Coupler Noise - Test Procedure

    1976 24 Searay 351 Mercruiser 233 hp<br /><br />I'm wondering which is the best way to determine what's causing a slight howling/scraping type noise - I swear - I'm begining to hear comming from the backside of my 351? when idling the engine.<br /><br />I'm thinking, remove the belt first to...
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    Older Tilt Trim Pump mixMatched with newer style cylinders. Slow moving

    Mercruiser 1986 gimbal with newer style Tilt/Trim cylinders is being pumped by a 1976 older style trim pump.<br /><br />Can that cause the outdrive to move up and down real slooooooow?<br /><br />No lines are crossed. Switches work fine. Pump is pumping to beat the band. Sounds like it's working...
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    How many more RPM's should I expect to see?

    1976 24' Searay 240 Fly Bridge Sedan<br />351 V8<br /><br />Switching my mercruiser over from 1.32r to 1.5<br />Can anyone tell me how many RPM's I should increase after changing my gears over?<br /><br />Boat won't go over 4200rpm with the 1.32ratio<br />Got a 12P prop<br /><br />Talked to a...
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    Want to SWAP? I need a 1.5r - I have a 1.32r ready to rock.

    I am looking to swap my 1976 Mercruiser 1.32 ratio outdrive for a 1.50 - Drive Gear 20 teeth, Driven Gear 22 teeth.<br /><br />If anyone would like to swap out, with no money exchange please contact me.<br /><br />My current drive = Drive Gear: 20 teeth, Driven Gear: 17 teeth.<br /><br />Mine...
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    What's my gear ratio?...if...

    24 foot Searay 240 Fly Bridge<br />Mercruiser 233hp Ford 351W<br />Pre-Alpha 1976 (roughly)<br /><br />My upper unit vertical gear has 20 teeth.<br />My upper unit horizontal gear has 16 teeth.<br /><br />Anyone know what gear ratio I have in this thing?<br />Is this a 1.32r? <br /><br />I've...
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    Water drips from shift cable on to intake manifold?

    Application: 350 GM 260 HP Mercruiser 1986 Wellcraft 23 foot.<br /><br />Can't find the post that explained the cause of an occasional drip of water from the shift cable right on top of the engine?<br /><br />Anone know what is causing this?<br /><br />- Change the cable?<br />- Change the...
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    Noise canceling material for engine covers?

    What's a good safe product to use to cover the underside of my engine covers.<br /><br />My engine is loud as heck at 3 grand rpm. which is my happy speed.<br /><br />Right now I've got 2 covers constructed of marine plywood with no insulation under them.<br /><br />any ideas?
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    Mercruiser 351W bangs going in to gear..

    This is a Pre-Alpha 1 drive mounted to a 351W in a 24' Searay.<br /><br />Always goes into gear and the noise has not increased at all over the summer but I have to say, the bang when it goes into gear sure is louder than I'd like to hear it shift.<br /><br />Anyway to quiet this thing down?<br...
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    350 GM Bongo Drum engine noise - Problem solved.

    Removed starboard side valve cover and found 2 rockers off...<br /><br />1 push tube broken, and one was just laying off to the side..<br /><br />2 valves were stuck shut..<br /><br />We freed up one, and are soaking the other hoping to save this engine in the wind up.<br /><br />Take care and...
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    350 GM has a bongo drum player inside at 1900rpm ?

    1986 Wellcraft 23 Foot<br />Engine: GM 350 CUBE 260hp <br />Drive: MERCRUISER ALPHA 1<br /><br />Engine idles nice and quiet all day long, but bring it up just a bit say 1900 to 2100 and an erratic internal knocking sound starts.<br /><br />It's not a steady knock like a rist pin or bad rod...
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    Boat Leans LEFT after planing off? WHY is that?

    Boat is a 21 Seapro WA 305 I/O with a bent skeg.<br /><br />This boat leans left like a Mo Jumper... <br /><br />It does not PULL LEFT -- it only leans to the left like crazy.<br /><br />There are no trim tabs on this boat...<br /><br />however,<br />Yes, it does have a stabilizer fin on the...
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    305 I/O Backfire above 4200 RPM - Problem SOLVED!

    The cause of my 305 I/O to backfire at high rpms was dirty water infested carb.<br /><br />Cleaned carb out, and problem went away.<br /><br />Boat runs super at WOT now.<br /><br />Thanks for those who put their 2 cents in on my request.<br /><br />PB
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    Are Outdrive Washers/Coolers - worth the venture?

    I've read that outdrive washers/coolers help to keep the outdrives from cooling down to quickly thus extending the life of the outdrive.<br /><br />Anyone have any info/results on using one of these tubing type outdrive washers/coolers?<br /><br />Thanks,<br />CaptainHook
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    1995 305 Backfire above 4200 RPM - HELP

    Unit: Seapro 305 190HP Mercruiser I/O 2BBL Carb<br />Hours on Engine: 544<br />Ignition is: Thunderbolt<br /><br />Runs fine up to 4000 to 4200 but go over that rpm and engine begins sounding off mulitple popping sounds thru the carb.... eventually ending up with an occasional loud backfire.<br...
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