470. Oil coming from valve breather tube

[jabfd]

Re: 470. Oil coming from valve breather tube

I also hope it was just one of those strange one-time things
If it is water getting in the oil, there is one other way but I was hoping you wouldn't ask
It's unlikely in your case, more likely if this was a winterization problem, and that is a cracked block

Another way to tell if it is water is to keep a close watch on your coolant level. You have a closed system, so any water getting into the oil would lower the coolant level.

Is it possible it can be my exhaust manifold

 

[Another retired guy]

Re: 470. Oil coming from valve breather tube

Is it possible it can be my exhaust manifold

I don't see how. Before going any further with this, try what the previous poster suggested. Pump out a small amount of oil into a glass. If it looks like oil then you do not have a water leak. If it looks milky, then you do have a water leak.

 

[stonyloam]

Re: 470. Oil coming from valve breather tube

It's unlikely in your case, more likely if this was a winterization problem, and that is a cracked block

Not likely, since the block is filled with antifreeze. Everyone seems to be assuming there is coolant in the oil. If there was the oil in the CRANKCASE would be milky. Is it? If it is not then there is no water in the oil.

 

[wrestling coach]

Re: 470. Oil coming from valve breather tube

Is it possible it can be my exhaust manifold

Answer this question for us. Is your crankcase oil milky? Look at your dip stick and let us know. This will help eliminate a couple areas of concern.

Dennis


Dennis

 

[jabfd]

Re: 470. Oil coming from valve breather tube

Answer this question for us. Is your crankcase oil milky? Look at your dip stick and let us know. This will help eliminate a couple areas of concern.

Dennis


Dennis

I am sorry it took so long to get back but the oil seems a little cloudy not really milk shake not sure if its just in the begining stages or if its some thing else . i hoped it was fuel pump leaking in to the oil but i dont smell gas in the oil .
iam going away for work the next couple of days so i wont be near the the boat . let me know what you guys think

 

[wrestling coach]

Re: 470. Oil coming from valve breather tube

I am sorry it took so long to get back but the oil seems a little cloudy not really milk shake not sure if its just in the begining stages or if its some thing else . i hoped it was fuel pump leaking in to the oil but i dont smell gas in the oil .
iam going away for work the next couple of days so i wont be near the the boat . let me know what you guys think

OK. With this in mind it's time for a couple tests. Compression and Leak down. Borrow the tools from Autozone. This will tell you the state of your head gasket. Thirdly inspect the weep hole @ the 7 O'clock position lower edge on your timing chain cover for ANTIFREEZE. Be sure it is clear by carefully running a straightened paper clip up into the hole. Should be NO antifreeze. This will indicate the state of your cam seals. Get back to us when you can with the results or further questions.

Dennis

 

[jabfd]

Re: 470. Oil coming from valve breather tube

I am sorry it took so long to get back but the oil seems a little cloudy not really milk shake not sure if its just in the begining stages or if its some thing else . i hoped it was fuel pump leaking in to the oil but i dont smell gas in the oil .
iam going away for work the next couple of days so i wont be near the the boat . let me know what you guys think

Ok I looked at the oil on the dip stick it does not look milky but i have a white film in the valve cover. Could this be just Condensation ? The oil I used when I changed the oil was a 1 gal container that was open and stored in the boat for some time. could it be that aim getting all the condensation out of the oil . Also it looks like the valve cover is leaking oil now at the end by cyl. 4 The last time i took the boat out the oil level was at the second L of full so it was a little over filled . After a 30 min run got back to the dock and there was oil on the valve cover . It came from the breather tube . Now before I started the boat today the oil level was at the u in full still a little over filled but I think last time the oil that came out the breather tube lowered the level . So why is the oil coming out the breather tube ? Thanks for all your help thanks

 

[jabfd]

Re: 470. Oil coming from valve breather tube

The compression test came back 150 155 155 145

 

[stonyloam]

Re: 470. Oil coming from valve breather tube

If the oil in the crankcase looks good, and from your description it is. Then you do not have water or coolant in the oil. Since it sounds like you need a new valve cover gasket anyway, so drain the oil that is in there, remove the cover and wipe it down, and fill with fresh oil (40W or 25-w40) and you should be good to go.

 

[jabfd]

Re: 470. Oil coming from valve breather tube

ok can i use a ford 460 valve cover gasket or do i buy a mercruiser one . and last time i used 25w40 and mercruiser filter
but i read here that a chevy v8 filter should fit so stp s5 . let me know if thats ok

 

[stonyloam]

Re: 470. Oil coming from valve breather tube

Here is a list of filters that will work: http://forums.iboats.com/mercruiser...uiser-470-oil-filter-part-numbers-314199.html Not absolutely sure about the gasket, but it seems like it should.

 

[jabfd]

Re: 470. Oil coming from valve breather tube

Does any one know if the 460 valve cover gasket will fit the 470 mercruiser