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to replace exhaust manifold seal/gasket - remove engine or head ???

P

pantybuncher

New member
engine: honda BF9.9A

problem: i can see that water is leaking inside the engine housing between the exhaust manifold and the engine housing. this is causing a water pressure loss and not allowing water to make it up to the head, and overheating.

to replace the gasket, should i pull the engine out, or take the head off to get access to replace the seal ??? i can't see any other option, since the exhaust manifold is trapped between the head and the engine housing.


the seal i'm referring to is in the attached pic, item #18. correct me if i'm wrong, but i'm assuming that this is the path that water is coming up from the water supply tube through this opening, and on up to the head.


(also the link to a parts fiche pic here: http://www.outboardpartsnation.com/...999/OIL_PUMP/BF15AX-JPN-SA/2418ZV40ZV48E0500B )


thx guys

Andy
Santa Cruz Harbor
(Kent)Ranger 26
 

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    honda_exhaust_manifold.jpg
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racerone said:
Sorry, your assumtion is wrong.-----This area is where cooling water leaves the engine.
Click to expand...

ok, it still shouldn't be leaking there, and i have to replace that seal, right ? so is the easiest way to replace that seal by removing the head or the engine ?

i could be wrong, so where would you suppose the water up tube supply connect to the engine, up under/into the block itself ?

either i'm not seeing the design properly, or the design seems a little odd(i would have expected the cool water to hit the head first and then exit past the exhaust).

the water route looks this way to me:

impeller-->water up tube-->a port under the engine enclosure that looks like it connects directly upwards to that pipe passage that is alongside(part of) the exhaust manifold as in the pic.


i'd appreciate anyone straightening out my misunderstanding on this.

thx
 
Last edited:
The cooling water enters under the block.---------It exits from the block and is injected into the exhaust stream thru the pipe that you are seeing.
 
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