Need help 94 Mercruiser 305

[Bry21317]

Re: Need help 94 Mercruiser 305

What kind of exhaust do you have? Straight thru hull or like a captains call which have diverters to route to the prop?

Straight thru hull no switch. The previous owner had the Y pipe capped off, so it is not longer used at all. Just two hoses that go from the Exhaust risers straight thru the hull.

Given the mechanics record, would check the water pump tube and o-rings. Also check the supply hose thru the outdrive is not crimped. I'd also check your drive oil for water. The quad ring is common to be forgotten by inexperienced and non-manual followers. It is a small o-ring that needs to be replaced when you seperate the upper and lower to do pump replacement.

I agree. If I had known I would have this much trouble, I never would have taken it to a mechanic, or him. I have done water pumps in outboards for 10+ years now, just not in an alpha 1 gen 2 yet. Now I will do it myself for sure. Where is this Oring? I am looking in the manual and service manual, that Don S used to post the links to the .pdf files. I downloaded them to my computer and have ready through just about all of them, for my engine and drive.

I think you would have a genII drive: http://www.boatfix.com/merc/Servmanl/14/14cover.pdf

I will take a look at this, I do have a Gen 2 Alpha 1 drive.

I have read through the manuals also, and think the problem has to do with the Water tube sleeve, coupling, impeller housing, or the orings around the bottom fo the coupling. Unless the housing is cracked.

Thanks for all your input. I am pretty much telling the mechanic what the problem is, thats sad.

Bryan

 

[Bry21317]

Re: Need help 94 Mercruiser 305

The link above gives me a .pdf file with only two pages in it, no documentation, just a front page and a second page that is has a part number on it, stating Mercruiser #14 Sterndrive units.

 

[bomar76]

Re: Need help 94 Mercruiser 305

Hover over the text below "Number 14"....
click...
you are there
Everything in a red box on that and following pages are links

 

[wca_tim]

Re: Need help 94 Mercruiser 305

Sorry for off topic post... Just noticed where you're at when reading the post... which lake is almost full? Jordan or falls?

 

[Bry21317]

Re: Need help 94 Mercruiser 305

Jordan is over full and falls is about 2 feet from full. I was on Falls and it was higher than it was all last summer.

Jordan I think is up 2-3 feet above its current full pool.

Bryan

 

[Bry21317]

Re: Need help 94 Mercruiser 305

Ok,
I have read through most of the 14 bulletin above, but do not see any part that covers the water pump. I see how to take the entire unit apart and all the gears, seals, everything, but I can't find anything to do with the water pump in there.

Am I missing it?

Bryan

 

[John_S]

Re: Need help 94 Mercruiser 305

Should be in 3B or at least it is in my hard copy manual.

 

[Bry21317]

Re: Need help 94 Mercruiser 305

I missed it.

It is in 3b. I am going to print it today, so that I can keep this information handy. Much easier to read in Hard Copy then on the computer.

I also think that if the mechanic does not have the problem fixed on the boat by Thursday, I will go pick it up and do it myself. Now I have all the information that I need to do it all. Even if he does fix it, I think that I might take it back apart and double check everything that he has done in the lower with the water pump, to make sure it is all done by the manual, as I think he is just doing it his way. I do not like that and do not do it that way myself. I go by the manual, step by step exactly what it says. You know it is right then.

Bryan

 

[John_S]

Re: Need help 94 Mercruiser 305

Yea, you will chew up a tree or two printing that. My HC is the actual printed manual and wasn't sure if it was the exact version of the online one. You should order the engine manual. It is not online. I think you need #17, but it will go by your serial number.

 

[JustJason]

Re: Need help 94 Mercruiser 305

First off running an engine without a thermostat is a no no....
But... if your still overheating with no thermostat...
I'd most definitely be looking at my head gaskets...
do a leakdown test and see what you find.

 

[bruceb58]

Re: Need help 94 Mercruiser 305

First off running an engine without a thermostat is a no no....
But... if your still overheating with no thermostat...
I'd most definitely be looking at my head gaskets...
do a leakdown test and see what you find.

This is a raw water cooled engine so I would not think that a head gasket would be causing an overheat condition.

Get an IR gun and measure the temp of the exhaust risers. This can at least show that you have a good flow of water. At the same time you can read the temp of the engine to verify that yout temp guage is reading what you think it is reading.

 

[John_S]

Re: Need help 94 Mercruiser 305

No water was coming out the exhaust, on a thru hull only exhaust.

 

[Bry21317]

Re: Need help 94 Mercruiser 305

Imported John,
Thanks. I have downloaded the #17 manual to my computer and this is what I read through on Sunday and found the missing Spacer. So I have that, thanks and you are correct it is the number 17 for my engine. That is a great manual, by the way.

I also have the clymers, but that sucks. Its ok for some tips and all but not for actual "Real Work" to fix something. Also I have noticed the diagrams are missing parts in the Clymers manual over the Merc Manual.

The problem is down in the Water Pump, this I know for sure now. If the mechanic has not found it, by Tomorrow, then I might go and get the boat from him, and take it apart myself. I know that I can fix it and figure it out, I am good at doing this.

I am very picky also, so even if he fixes it, I am sure that I will go behind him and put new parts in there anyways or double check to make sure there are new parts.

Bryan

 

[Bry21317]

Re: Need help 94 Mercruiser 305

Well the mechanic called me last night and said that there was something wrong with the gasket, and it was leaking. This was located on the Waterpump. So this is now fixed and I will be picking it up today or tomorrow and see what it does.

From what it sounds like, It should no longer over heat.

So maybe I can get to take it for another test run, not sure about this weekend yet, but I might try to.

I have some upholestry work being done, so I might be putting this all back in this weekend as it is supposed to be done by Friday. Keep your fingers crossed, but it sounds like it is now good to go.

Imported John, Thanks for all your HELP! I will be doing all the work on this boat myself, from now on. I trust myself, but not many others when doing work for me. As I am very meticulous, and make sure that I do everything by the manual and what is stated, so when I have a problem as this, that seems to me a shortcut was taken, does not sit well with me.

Bryan

 

[JustJason]

Re: Need help 94 Mercruiser 305

10 bucks says it will still over heat...
Any takers?

 

[John_S]

Re: Need help 94 Mercruiser 305

Jason,

No takers. I don't like the explaination. I would retest on muffs before wasting time splashing the boat. But, maybe that was already done and witnessed, but not posted.

 

[Bry21317]

Re: Need help 94 Mercruiser 305

Imported John,
I am going to go and try to get the Boat tonight, if not it will be tomorrow night when I pick it up.

Once I get the boat, I plan on running the crap out of it on muffs, to make sure. I never will take the boat to the lake without first testing and retesting to make sure it is running right.

I will let you guys know what I find. I am going to try to get it tonight, but will have the kids with me, so it may or may not happen yet.

If it still does overheat, I have a full water pump kit with the SS housing and everything showing up today. So I will have all the parts to fix it myself, if nothing else.

Bryan

 

[bruceb58]

Re: Need help 94 Mercruiser 305

10 bucks says it will still over heat...
Any takers?

Why...you still think it is a head gasket? If so, please explain how a head gasket leak would cause an overheat condition on a raw water cooled boat.

 

[JustJason]

Re: Need help 94 Mercruiser 305

Why...you still think it is a head gasket?

Could be... could be alot of things... althought.. there's not many thing that will cause an overheat with the thermostat out.
the post is titled 94 Merc 305. However, the owner has apparently replaced factory parts for "hi performance" yet non factory parts...... and now he has a problem.... wonder why.
This is yet another example of why i don't touch what i call "frankenmotors".

Logic would say... it ran cool before the new parts, and now its running hot. So why is this guy tearing into his waterpump? Logic would say the waterpump was plenty fine on the factory parts. Also... this guy says that whatever his mechanic does he's going to tear down and double check.... what's the point in that???
Hope he's not paying this guy.
This is what you get for playing around with motors that you know nothing about.
This is where i'm at right now......
1. Incompatable parts
2. compatable parts installed incorrectly
3. Incorrect plumbing
4. bad head gasket
5. bad circulating pump

But the boats not in front of me.... so who knows.
I'd be curious if clear hose was put inline from the water input hose... bet it hasn't been yet.
Even raw water cooling... the pressure from the pump is probably in the area of 20+ psi..... If a head gasket was bad and pumping air into the cooling jackets.... its going to pump way more than 20psi of air into the block. And air up the block... it doesn't matter if it's fresh water cooled or closed cooling... the effect is the same. It's just going to take a bit longer to show up on a fwc engine.
Overheating with a thermostat is one thing... overheating with no thermostat is a different animal.
This guy should.... in order....
1. because this is now a frankenmotor... he should grab a notebook and pencil and start drawing out a cooling system diagram for the motor.
2. replace water inlet hose with clear test hose.
3. pressure test the block
4. leakdown the cylinders
the answer is somewhere in there

 

[John_S]

Re: Need help 94 Mercruiser 305

Jason,

I'd hardly call an intake maifold/4brl carb change a frankenmotor. If he used a cast-iron intake, it would be essentially the same as a 5.0LX.

I believe most of the issues have been caused by his mechanic. While he might have been better off starting with questions here, and doing the work himself, he seems to have bitten the bullet and going to dig-in and solve/fix it. For me, everything that the mechanic has done is highly suspect. Given the carb issues, that he has to get back to, might have a gasket leak and possible egr passage leak.

I feel the head gasket is unlikely, like Bruce, but know better to say it couldn't be it. I feel that the wot performance that was achieved would be hard to do with a blown head gasket. Doing a seasonal compression check (and if bad-leakdown) would be good practice/maintenance routine.

Lets see where he is after the testing on the muffs.