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Old 05-04-2005, 10:55 AM
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Default Blown head gasket???

I took my boat to the shop yesterday for some repairs. The main thing I have been
having a problem with is I am getting water in the cowl, when I tilt the motor
up I have water pour out of the engine cowl. It is not a lot(maybe a pint or so) and I
can also see on one side of the engine the plugs are rusty from water. I treat the engine
with corrosion block on a routine basis and the motor runs fine and does not overheat.
However this thing has been bugging me.

Anyway when I explained this to the mechanic he mentioned a couple of things and he did
say there was an outside chance it could be a bad or blown head gasket, which this
had crossed my mind also but the boat runs fine and does not overheat at all.

If it is the head gasket how major of a repair is this and what all has to be done
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Old 05-04-2005, 12:06 PM
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Default Re: Blown head gasket???

Head gaskets usually aren't that hard. I've done a couple although neither was on a newer motor. Remove the cylinder head cover and scrape out the old gasket. Make sure nothing gets into the cylinders. Check the manual for the motor and get the torque specs and check to see if they recommend some goop or similar adhesive. Install the new gasket and tighten the bolts down to specs. This is the short version, I'm sure someone has done one to this specific motor and could be of more assistance than I.
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Old 05-04-2005, 12:10 PM
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Default Re: Blown head gasket???

It's actually a simple repair on an outboard.The trick is finding an honest mechanic that's not going to try and rip you off.

Like the one that a member here said charged him $850 dollars to change a Yamaha fuel pump.

Juice summed it up in a nutshell. You need a torque wrench and the specks.



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Old 05-04-2005, 01:28 PM
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Default Re: Blown head gasket???

I have used this mechanic several times before and he is pretty honest and has
even done a few minor things for me at NC.

Just curious if this could be the problem also. The motor has no loss of power and
runs great.
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Old 05-04-2005, 01:46 PM
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Default Re: Blown head gasket???

Try running the motor with muffs or in a bucket with the cowl off. You should be able to see water come squirting out if motor is a 2 stroke.
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Old 05-04-2005, 11:24 PM
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Default Re: Blown head gasket???

try doing a compression test on the motor that will also help determine if the head gasket is bad also,
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Old 05-05-2005, 05:45 PM
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Default Re: Blown head gasket???

Not knowing your year engines, I have seen engines leak where the water jackets mate with the heads. As much as seeing the actual casting corroded through. Two options, replace the head and water jacket cover, or pull the area where corroded out. use Marine tex with wax paper and tighten down the water jacket cover, once dry pull it apart again and file so it mates flat with the water jacket cover. New gaskets and your done.
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Old 05-05-2005, 06:11 PM
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Default Re: Blown head gasket???

I had an old Merc that pumped water into the shroud...but with the newer engines it's hard to say....I don't see why they couldn't. Basic block design is still pretty much the same just the fuel and electrical systems have changed...

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Old 05-05-2005, 10:06 PM
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Default Re: Blown head gasket???

Compression yesy may not reveal blown gasket as a small gasket leak can cause a problem and with the dynamic nature of the comp test you may not see a big difference. Better to do a leakage test. Rotate piston up to block ports, then lock crankshaft. You need a compression tester type fitting to screw into cylinder. Then you hook up a regulated air hose to this. Apply pressure to cylinder30-50 psi and see if you have air leaking out. You can use the spray soap trick to look for small leaks. These are a BIG job on cars but actually very simple on 2 stroke outboards.

As mentioned - you must have a torque wrench tp properly tighten. Also proper surface preparation is critical.

Good Luck

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Old 05-06-2005, 11:35 AM
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Default Re: Blown head gasket???

My Yamahas have a plastic water line originating on top of the engine - under the cowl - and going to the dash mounted water pressure gauges. It has leaked in the past.

Before tearing apart the engine, try running it with the cowl off and try to see where the leak is coming from. Since there seems to not be a performance issue with your engine, you may find that it's something simple.

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