Milky Oil

[puckduck1]

I have a 1973 165 I6 with milky oil

Freeze plugs are intact
No water in the bilge
Spark plugs look normal - None have been fouled, steam cleaned or anything out of the ordinary.
Water is not pouring, squirting or spraying out from anywhere that I can see

Ran up and down the river for at least 30 minutes and only saw the oil rise about 1 MM on the dipstick.
Engine ran a little rough (previous owner used autolite plugs)
Water temp is 140 - 145
Oil Pressure a little too high for my taste


Question is Cracked Block, Blown Head Gasket or What?

 

[Sangster21]

Re: Milky Oil

I am not a mechanical guru, but I would think a cylinder compression test followed by a cylinder leak down test would be a good start to figure out where the problem lies.
Alan

 

[achris]

Re: Milky Oil

Where are you located? Did you winterize by draining the block AND manifold completely and leaving it empty, or did you refill with anti-freeze? Was this the first trip out after de-winterizing?

It doesn't take a big crack to allow enough water into a crankcase to emulsify the oil....

Chris....

 

[puckduck1]

Re: Milky Oil

Southern Michigan, the guy I got it from said he winterized (have receipt) and had it out in May (or so he says)

 

[achris]

Re: Milky Oil

Hmmmm... Are there consumer protection laws in Michigan?

 

[Don S]

Re: Milky Oil

Ran up and down the river for at least 30 minutes and only saw the oil rise about 1 MM on the dipstick.

Is that 1mm correct? Not sure how anyone is going to notice a single mm of oil rise on a dipstick.

Drain the cooling system, block the water hose to the exhaust manifold and pressure test the block.

 

[Bondo]

Re: Milky Oil

I have a 1973 165 I6 with milky oil

Freeze plugs are intact
No water in the bilge
Spark plugs look normal - None have been fouled, steam cleaned or anything out of the ordinary.
Water is not pouring, squirting or spraying out from anywhere that I can see

Ran up and down the river for at least 30 minutes and only saw the oil rise about 1 MM on the dipstick.
Engine ran a little rough (previous owner used autolite plugs)
Water temp is 140 - 145
Oil Pressure a little too high for my taste


Question is Cracked Block, Blown Head Gasket or What?

Ayuh,... Cracked block is My guess...

 

[achris]

Re: Milky Oil

Ayuh,... Cracked block is My guess...

Mine too... I don't care what the guy said, or even the receipts he can produce... Freezing temperature + water in the oil, almost always = cracked block....

Chris........

 

[puckduck1]

Re: Milky Oil

I agree with the cracked block theory, I put it out on the water today and the oil level went up drastically and it ran like poo. Luckily I have a machinist/engine guy in my neighborhood and he is going to help me out in the rebuild.

If I wouldn't have gotten such a geat deal on a very solid old SlickCraft, I would really be pissed.

 

[Don S]

Re: Milky Oil

I agree with the cracked block theory, I put it out on the water today and the oil level went up drastically and it ran like poo. Luckily I have a machinist/engine guy in my neighborhood and he is going to help me out in the rebuild.

Hmmmmmmm From your original post I thought you already did that.

Ran up and down the river for at least 30 minutes and only saw the oil rise about 1 MM on the dipstick.

 

[puckduck1]

Re: Milky Oil

I was leaning in that direction(cracked block), but the first time out, it really didn't run that bad and I was kinda of hoping it was something else. I guess I was in denial. Next up is to find a good block and start the rebuild process.

Yanking the motor is going to be tough isn't it?

 

[achris]

Re: Milky Oil

Yanking the motor is going to be tough isn't it?

Nope... It shouldn't take more than a couple of hours...