water in my oil update

[vipzach]

First thankyou for everyone's suggestions about getting the moisture out of my Mercruiser 3.0. I finally got out it out by changing the oil 6 times. I am now ready to hook up to water and really see if the block is cracked or not. When I try to start the motor, it starts and dies after a few seconds, I noticed exhaust puffing out of the exhaust manifold each time it would die. So I started the motor and covered the hole with my finger and it will stay running. It is threaded hole. The dealership I usually buy parts from said that there should probly be a plug in it, but could not find a picture of it to confirm. I am wondering if anybody knows anything about this. This is a 91 VIP Vision with a 3.0 Mercruiser and Alpha One drive. Thankyou

 

[DHPMARINE]

Re: water in my oil update

Well,if you can plug this hole with your finger,just where is it ? Picture available ?<br /><br />Sounds like it maybe in the intake manifold ?<br /><br />DHP

 

[vipzach]

Re: water in my oil update

I am sure it is the exhaust manifold. It is in the center of the manifold on the side.

 

[Silvertip]

Re: water in my oil update

Perhaps this hole is the water jacket drain that has a plug missing and since the manifold is cracked, allows water in the engine???? Picture sure would be nice.

 

[tommays]

Re: water in my oil update

vip<br /><br />on the 3.0 the intake and exaust are a 1 piece unit and it can be hard to tell were one starts and the other ends<br /><br />from your post it sounds like its part of the intake and allowing a vacume leak<br /><br />tommays

 

[vipzach]

Re: water in my oil update

The previous owner had the exhaust replaced because the old one had a crack, that is why there was moisture inside the motor (I was told) I thought maybe the place that did the work had maybe forgotten something. I will try to get a picture tonight though

 

[Don S]

Re: water in my oil update

Is the plug in either one of these pictures?<br /><br />Picture 1<br />

<br /><br />Picture 2<br />

 

[vipzach]

Re: water in my oil update

No, those picture look like they are towards the motor, this hole is on the opposite side of that. It takes no effort to cover the hole, don't have reach under or around anything. If I am not wrong, picture 2 looks like manifold though.

 

[yoced]

Re: water in my oil update

I am guessing Sierra 5 bolt manifold, and the threaded hole is leading into the intake of the manifold, which is why it doesn't run so well until you put your finger on it.<br /><br />They were not supposed to drill that hole through, but seem to have on an entire production run. Weirder yet is that the boss is there to mimick the really early manifolds whose throttle linkage came in along the outboard side of the manifold like that - entirely unnecessary.<br /><br />If I am correct you can just put a bolt (5/16-18) with a bit of sealer on it in the hole and have a good life. Either that or you can find something you want hung there and make a bracket to fit (you will find the sister hole a bit to the rear, under the riser).

 

[vipzach]

Re: water in my oil update

Thankyou for everyone's advice and help, I forgot my camera this morning...so no picture yet. I will buy a bolt and see what happens this weekend.

 

[trog100]

Re: water in my oil update

course the engine stopping with finger off the hole fits nicley with hole in intake manifold.. however it dont fit very well with exhaust gas puffing out of it... he he he<br /><br />either way bung it up and see what happens..<br /><br />trog100

 

[KaGee]

Re: water in my oil update

Kinda like the Dutch boy and the dike!

 

[Flukinicehole]

Re: water in my oil update

Trog,Exhaust gasses will come out of intake when engine quits.This is very normal as combustion just occured in a cylinder and has backed the engine up to open the intake valve.Havent you ever seen smoke come out of the carb. when an engine quits? I agree with the vaccume leak.

 

[vipzach]

Re: water in my oil update

Thankyou "yoced", that was the bolt size it needed. I put a new fuel filter in the boat and now it runs. The problem is that it idles from 900 RPM up 1400 RPM, going up and down. I can run the RPM's upto about 2500 for a few seconds and the boat dies. Really sounds like a fuel problem. My manuel shows the fuel filter as a catridge looking filter with the spring on top, the filter I took out and new one look more like spongey rock with the spring on bottom. Did I put it in wrong . <br />Second question: My outdrive sounds like it has a vibration in the lower half. Could the water pump be ruined from running it a few minutes without water, and if so could that also make the noise?<br />Thankyou

 

[rodbolt]

Re: water in my oil update

flukin<br /> exhast gasses never come out of the intake unless something is very very wrong. the smoke you see is the over rich fuel mix and/or fuel peculating out of the bowl. if the carb is rich the fuel puddles in the itake at low speeds. when ya shut it off the fuel boils and that is the "smoke" you see. usually indicates a high float setting or a leaking needle but not always. some engine/intake designs are more prone to low speed puddling than others.<br />vipzach. there are normally 2 filters on that motor. one in a bowl on the pump and another in the carb fitting. one is a stone looking rig (pump)and the other a cartridge screen type (carb). 60 seconds of dry run will obliterate your pump and both pump housings. if you ran it 2 or 3 min without water buy the upper and lower base kit. comes with the base,impeller upper housing and all gaskets and orings. also buy a factory service manual. now the fun begins

 

[vipzach]

Re: water in my oil update

I did not realize the intake and exhaust manifold were together, the manuel I just bought is Solec and it shows the filter in the pump as a cartidge type not the stone. I pulled the line off the carb and didn't see another filter or a place for one. If it is running rich or lean the may explain the running poorly at idle and possibly why it dies after a few seconds when I try to run up the RPM's. I will check on a rebuild kit for the carb and a base that you suggested. Could that be the rattling I noise I hear from the outdrive?

 

[Flukinicehole]

Re: water in my oil update

Rodbolt I agree if you shut the engine off(with ignition switch) it should not puffback.If the engine dies on its own with ignition still on you will see a puffback. This is very common and does not mean something is very wrong.Something is wrong yes but not very wrong.

 

[trog100]

Re: water in my oil update

yes once the engine has stopped whispy smoke can come back up the intake manifold and out the carb or even a hole in the intake manifold if there is one.. <br /><br />but it isnt strickly speaking exhaust gases.. and it certainly cant or should not do this while the engine is running..<br /><br />so yes smoke can come out the carb in certain circumstances.. but not exhaust gases..<br /><br />thow thinking about it more if the engine didnt stop properly say kinda dieseled and praps even tried to run backwards all sorts of weird things might happen.. he he.. whether this would fit in the wrong or the very wrong category is kinda open to debate..<br /><br />i must admit by first comment was along the lines of what can happen with the engine running not after it has actually stopped..<br /><br />mind u if there is a hole that big in an inlet manifold so as smoke can puff out of it when the engine stops.. the engine should not run at all except praps on full choke and high-ish revs..<br /><br />trog100