This is a puzzler...ok Pro's question for you.(UPDATE)

[Gary H NC]

I noticed my last time out this season i am getting exhaust stains on the upper part of the mid section.
Its mostly in the front area closest to the transom bracket.
It comes out from under the small plastic shroud.I removed the shroud and can not see where it could be coming from.
The motor runs fine.
Inside the engine cover and the lower pan is clean..

I have a complete powerhead gasket set if i can find the cause..
Winter is wrenching time..

Any ideas guys?

Johnson 175 Crossflow...81 model

 

[Benny1963]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

gary as you know im not a pro but powerhead base gasket may leak there
i had a lower exhaust cover leaking on mine but the stains were on the pan
pull the pan cover run it and see if ya got a leak at powerhead base gasket
i thought you were selling it man i would buy it in a heart beat for 3500
glad to see ya on here im sure hadly or ezeke will chime in
best to you and your family

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Thanks Benny! Good to see ya man!

I think i'm going to keep her now...

Here is a pic of the stains,

 

[tashasdaddy]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

that's one for Dhadley.

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

I'm kind of dreading to know the answer...lol!
Never had to pull a powerhead..

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Bump^^^^

 

[Benny1963]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

hey gary if it comes to that ,its not bad at all .you can pull it dressed that way ya dont have to retune it ,three bolts on each side two studs that have nuts front and rear ,pulling the powerhead on mine was the easiest thing that i did on my rebuild ,used engine hoist and three finger puller on flywheel
if it turns out to be your gasket ,you will be able to pick up your powerhead
clean surfaces put back on its not near as bad as it looks ,mine was saltwater and i had to rebuild .broke one bolt on side had to helicoil
dont try to reuse the old mounting bolts they will break ,i learned the hard way,good luck maybe mr hadley will bet on this for ya ,you may want to
pm him he is a really nice guy .
later gary if ya change your mind on the sale call me first ,that boats
beautifull for the money you were trying to get ,
you cant buy anything that nice ,run it till it falls apart from the looks of the boat, that will be a very long time ,i ran my motor i built last weekend
had to change control cables ,broke shift cable went and got one
changed it put boat in water went to give it some gas and broke throttle cable ,lol thats boats for ya work on them one year use three weekends
talk to ya

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.DHadley or Ezeke?

Re: This is a puzzler...ok Pro's question for you.DHadley or Ezeke?

Lol! Thanks Benny, Sucks about your cables.. I hope your rebuilt run good!

If i got to drop the lower and lift the powerhead that won't be too bad.
I will get a new rubber seal for the upper exhaust tube while i'm at it.
It will give me a chance to put a good paint job on the lower anyway.
The impeller only has maybe 15 hours on it.

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

One more bump....surely someone has had this problem.

looking at the BRP exploded view it looks like it could be a couple different gaskets..

 

[Joe Reeves]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

The powerhead base gasket has failed and is allowing the exhaust to flow into the upper motor mount area.

Cure...... remove the powerhead and install a new gasket. Be sure to check the sealing surfaces of the powerhead and the adapter plate for corrosion/irregularities and if such should exist, build those areas up with "Gray Marine Tex" to avoid a repeat of the problem.

Note: Before putting a wrench to that powerhead, disconnect one terminal of the battery to avoid electrical problems.

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Thanks so much Joe! The diagrams are a little confusing,powerhead base gasket then the couple adapter to exhaust tube gaskets and so on...

Did this harm anything running it like this?

Thanks!

 

[Joe Reeves]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Probably didn't harm anything BUT pay attention to the sealing surfaces as I mentioned above.

The powerhead base gasket is actually called something else, however it is the one that the powerhead sits directly upon.

The coupler gasket (probably the adapter plate gasket) pertains to the gasket that exists between the adapter plate and the long exhaust housing. The powerhead sits upon the adapter plate, the adapter plate sits upon the exhaust housing. Hopefully you will not need to remove the adapter plate as that does get somewhat involved...... but if it comes to that, the fellows here can guide you thru that also.

If after removing the powerhead, you find the upper motor mount area loaded with the exhaust residue, you can pretty well figure that the powerhead gasket area is the problem area.

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Thankyou Mr Reeves!

I think that base gasket was included in my powerhead gasket set..I assume the shift rod must be unhooked?
I need to go check if i have the gasket.

i'll get the lower pulled this weekend so i can start on the top.
Much reading to do in my OMC service manual..

Can 2 strong guys lift the powerhead off or do i need a hoist?

Looked on the BRP site..looks like its called adapter to powerhead gasket.

 

[tashasdaddy]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Gary use a hoist, on that big powerhead. atleast the tree limb you used before.

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Gary use a hoist, on that big powerhead. atleast the tree limb you used before.

Thanks TD,Yea all i need is my back to go out again.
I may ask my neighbor if we can do it in his garage.He has a wood stove and a hoist...

 

[Benny1963]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

gary use a hoist you will have to use three finger puller on the bolt holes around flywheel unhook your fuel line unplug red plug .disconnect battery cables ,there are three long bolts on each side of powerhead,two nut on front and back of powerhead ,drop your lower first, you should be able to
pull powerhead whole as ezeke said make sure your surfaces are clean .
and trust me when i tell ya dont reuse powerhead mounting bolts ,
unless money is and issue ,lol,you can torque the three on the sides
but the nut on front and back have to be done by hand.my bolts looked great , but when i went to torque them i broke one and had to have helicoiled ,meaning i had to pull powrerhead ,take as little as possible off pull it whole hang clean gasket surfaces and check for pitting and drop it back on
with fresh powerhead to adapter gasket pn 0323214 i used a little permatex 300 lightly on mateing surfaces ran them in with a little antiseize,they have lock washers .i forget where i got my mounting bolt kit but if ya cant find i will call my boat guy he got them for me 21$ for set ,if i had done it the first time they would have paid for them selves .because i had to take powerhead back off and have bolt removed and helicoiled 20$ lol
any way gary if you need some info pm me , if i wouldnt have to hads built mine the job probaly would have taken two hours , the good thing is pull it whole you dont have to retune anything ,you may have benn running a little rich with that gasket blown,because of exhaust in cowling,
as far as mine gos it running great i built motor and carbs ,and took it to really old evin guy and he timed it in tank and link and sinked .
it now runs 53 gps at 5500 with 21p evin stainless prop
my next step is smart tab sxs
see ya later call me or pm if ya need help ill pm ya my home number

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

Thanks Benny,Really appreciate the info on the bolts.I will check with my local dealer.
If they want an arm and a leg i will pm you.21 bucks would be well worth it plus i could send you something for mailing them to me..

This will give me a good project to do in a couple weeks.

Still trying to figure out what to do with that 55hp i have.It has one cylinder scored.Not bad but it will need a piston and honed out.
Was going to part it out on Ebay if i ever get around to it.
If you know anyone that needs any parts it has a good lower and ss prop.
Electronics are good on it too...

 

[Benny1963]

Re: This is a puzzler...ok Pro's question for you.

Re: This is a puzzler...ok Pro's question for you.

no prob gary what year is that 55
you dont have to send me anything for help man were a gang on here man
lol. probaly going to iraq for 90 days but will have lap top may send ya guys some video looks like my contract has went thru may come your way to train up for a few days at bws shoot um up spot ,any way it gos will stay in touch

 

[Gary H NC]

Re: This is a puzzler...ok Pro's question for you.(UPDATE)

Good luck over there Benny!

I got the powerhead off!

Joe Reeves was correct! The base gasket was blown between the two exhaust ports and a water passage. So it was blowing exhaust and water from under the powerhead.
I thought it was sounding louder than usual.

The GLM gasket kit has the wrong base gasket!
They did not cut out the 2 holes for the rear studs that are in the powerhead!
They did have 2 of those in the kit...why??

Anywho...got to order the correct gasket...

Another question,do all the bolts need replaced or just the 6 long ones?
Almost 7 bucks a piece!

Benny,if you can hook me up with the mounting bolt kit that would be great!
Sent ya a PM!

 

[ezeke]

Re: This is a puzzler...ok Pro's question for you.(UPDATE)

The full list price on those long bolts is supposed to be $3.61? Part number 908931.