Mercruiser 5.7 white smoke Grey oil

[ajtk2000]

I have a 97 Stingray 659ZP with 5.7L Mercruiser EFI. I put it in the water yesterday and it had no power. When I would open up the throttle it would bog down and start to smoke. It would idle fine and the engine sounds normal. I also noticed some foam on the water behind me.

When I pulled the boat out of the water there was grey milky oil coming out of my bilge hole. I removed the engine cover and the grey milky oil was all over the engine compartment.

This stuff is thick as grey paint. any ideas?

 

[dgopetactical]

Re: Mercruiser 5.7 white smoke Grey oil

I have a 97 Stingray 659ZP with 5.7L Mercruiser EFI. I put it in the water yesterday and it had no power. When I would open up the throttle it would bog down and start to smoke. It would idle fine and the engine sounds normal. I also noticed some foam on the water behind me.

When I pulled the boat out of the water there was grey milky oil coming out of my bilge hole. I removed the engine cover and the grey milky oil was all over the engine compartment.

This stuff is think as grey paint. any ideas?

Sounds to me like you have a internal crack in your block /head and or a major riser/manifold failure that allowed your crankcase to fill up with water and overflow into your builge (grey oil) The white smoke indacates water ingestion into your cumbustion chamber ..Sorry to say this does not sound good for you at all. No matter what failed You need to get that gunk "water/oil "out of your engine right now to try to save as many parts as you can incase of a rebuild. Im sure somebody will chime in with a proper way to do this. Hopefully you were in fresh water. If you were in salt I feel even worse for you. Either way do something today tomorrow is too late. So in ending "today" it does not matter what caused the problem you have to get that crap out of you engine and preserve your internal parts. Worry about what caused it after that. I hope everything works out good for you keep us posted.
Denny

 

[dgopetactical]

Re: Mercruiser 5.7 white smoke Grey oil

by doing some quick searches related to your issue. I would drain my oil NOW and "pickle" my engine with deisle fuel (fill the crank case up) and pull the spark plugs and put some oil in there. The cause of your issues could be what i said in the above post and from what Im reading you can throw a possible bad head gasket in the mix also.
Denny

 

[JustJason]

Re: Mercruiser 5.7 white smoke Grey oil

if you got cracks in the block under your manifolds then your motor is junk.

Did you self winterize?

 

[gadget73]

Re: Mercruiser 5.7 white smoke Grey oil

Pull the dipstick and check the oil level. If its full to the top, you can pretty well bet on a cracked block. If thats the case, its time for a new motor.

 

[ajtk2000]

Re: Mercruiser 5.7 white smoke Grey oil

I took it to the local shop to get looked at. Sounds like its going to need rebuilt. I'll call them tomorrow morning and see if they can tell me what happened.

I have it winterized at the shop, but I may have taken it out too early this year. We had a few cold nights after I ran it.

If it was a freezing problem, would it have ran fine a few times before broke?

 

[ajtk2000]

Re: Mercruiser 5.7 white smoke Grey oil

Update - Block was cracked on both sides. Shop said it was most likely due to freeze damage.

Reman'd motor and $5400 later I'll be on the water today. But hey, I was due for new plugs & an oil change anyway.

I will winterize BEFORE winter this year.

Thanks.