GT-40 milky oil

[richard]

2 days before when go a ride the boat can't start,found some (6 peice spark plug) wet and no spark , change it and finally can start like normal,
We don't use the boat that day bcause too late , Yesterday, before go a ride,
I change engine oil, I suck out milky oil,(light brown color),engine still can run,a friend told me 90 percent caused by a leaking manifold and riser, short time ago his X-STAR experience the same isuue , I remove the riser it's get rust and some hole near seal by the rust metal, the engine had runing high temp 180F some time,and accidently one time up to 240F (few minutes), I open the valve cover,the milky oil can find there, I cut the raw water to the riser and suck all the milky oil change new oil, run the engine with hose pipe some period and change oil again to clean the milky oils ,after 6 litre,it becomes not so sticky but still milky, I thik change a pair new manifold and riser first, any fans had experience on his? my boat is running on sea,hour under 500 HR,manifold and riser had change at 350 HR.

[M3Fan]

Ok, oil doesn't go near exhaust manifolds so exhaust manifolds/risers have nothing to do with milky oil. It's either a head gasket or cracked block most likely. Take it to a qualified repair center and pull out that wallet.

[Labatt911]

I had a problem recently with my GT-40 engine where I could get it to run but once put in gear it would foul out. After the entire engine was taken apart to check the head gaskets, block, and exhaust manifold. Turns out the problem was that the water getting into the engine was coming from the fuel tank. The engine was sucking the water instead of gas. Might be worth checking before breaking the entire engine down.

[richard]

Thanks for the advices, my first thinking also fuel tank has water and sucked into engine, when I sucked few litre milky cream like oil, I consider more sreious proprblem,Head gasket burn,or manifold/riser leak,autually there are different reason makes this, Labatt911 experience over judge,so did over job money,the experience of Labatt911 turns me to look at fuel tank water again, my issue happen a little different than normal, the last day I use the boat till the fuel remain less than any time I use,may be this cause suck the water from fuel tank? I will clear the milky oil and test to water one time, unfortunatly,I could't find qualified repair centre within thousands kilometer.
The list I make to order for this service:
1) 1 set sparkplug
2) oil filter x2
3) valve cover gasket x2
4) head gasket
5) riser x2
6) manifold x2
7) riser/manifold gasket(include screws) 1 set
because I order far away and may need over 1 week ,so I don't want miss any necessary parts,
any thing else need?

[Dr.John]

Labatt911, splain that one!

[richard]

Thank you Mr. DR.John

[Labatt911]

I tried ? ? ? ? ? ? ?

[clayk]

what he is saying is that the reason for his not running was the water in the gas tank, not the milky oil. the reason for milky oil is water in the oil, probably from a leaking intake gasket , a blown head gasket , cracked head, cracked block, or a cracked timing cover. hopefully it is a leaking intake gasket .

[M3Fan]

Richard-
Skidim.com sells an entire gasket kit for the whole top half of the engine. That will cover all the bases.

[Mikeski]

1. blown head gasket
2. cracked intake water bypass above cam journal or leaky gasket
3. cracked block

Do a simple pressure test on each cylinder see if one is running low, if one is then you likely have a blown head gasket. Most likely you will need to pull the intake and heads to fix your troubles. As m3fan suggests get the top half kit from ski dim.

[Sbt3]

I would really lean toward the head gasket, especially after your comment that the boat over heated to 240. Once they get hot the head gasket is usually going to go. It might not happen right away, but sooner or later that is probably leak.

[richard]

Thanks for the helps advises,
after cheking the FCC out put normal, I cheack the sparkplugs, most no spark, that is the reason why engine can't fire, after change 6 no spark sparkplug, the engine can run finally,and sounds normal, and I taste salty on the sparkplug, (I use in sea), so it's raw water leaking, further problem I found is milky oil, there must some leaking,or water in fuel tank , I check the FCC bottom nut,I remove and check the liquid,it's gasoline, so probably not caused by water from fuel,secondly,I check rise and manifold, inside are serious rust,,I order riser and manifold from DIM,I need few days or one week to get, I'll post the result.

[richard]

I forgot to say,I did check four clinder pressure,1 sohows 60psi,others are 100-130psi

[91nautique]

Richard,
Check your pm.s

[richard]

91nautique:
sorry, what is pm.s