Merc 470, new waterpump/cam seals...few more questions.

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

I am almost positive I did the impeller right, heck I could be wrong, maybe after I try to figure out everything inside the boat figured out ill pull the lower end off, wont hurt.

Now do you think the heat exchanger could be clogged? I took the front cap off never the back one and sprayed the hose inside of that...

What hoses should I check for something being clogged inside?


solar7647-you're helping me out a bunch thanks!

Remove the hose from the right side of the voltage regulator, point it into the bilge, start engine with muffs on, if you dont get water the problem is in the drive, you should get a lot of water if its running right.

If you get water, follow the hose on the other side of the regulator to the point that it connects to the exchanger, pull it start the motor with muff on, if you get water, put it back on and pull the hose that is in your post labled #1 from the exchanger, start motor with muffs on. If you dont get water the issues is the exchanger.

do it in that order, to properly trouble shoot the issue you start at the begining of the system and work your way till the end until you find an issue.

Let us know what you find.

 

[Newbie@boats]

Re: Merc 470, new waterpump/cam seals...few more questions.

ahhh, any chance you would have pictures of where this stuff is?

If not ill try to take my laptop out to the boat and follow what you said, ill try to do that tomorrow.

Thanks ill keep you upated asap!

 

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

ahhh, any chance you would have pictures of where this stuff is?

If not ill try to take my laptop out to the boat and follow what you said, ill try to do that tomorrow.

Thanks ill keep you upated asap!

I was in the process of making it for you!

Hear you go

You dont have power stearing so you dont have a cooler, your is just the hose.

The flow path

ONCE YOU GET THIS FIXED PUT ANTIFREEZE IN THE COOLANT SYSTEM!!!! GET 50/50 FROM YOUR LOCAL AUTO STORE OR WALMART OR GET CONSINTRAT AND MAKE YOUR OWN.. dONT USE WATER!

 

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

Oh and by the way, you can use the link in my signiture labled 3.7L rebuild: the thread as a referance for your engine.

They are the same basic engine. The differance is mine is 180Hp, has a 4bbl carb, bigger intake, oil cooler, power stearing and power stearing cooler. The Block, head, cooling system, and the rest are the same as yours.

 

[jerryjerry05]

Re: Merc 470, new waterpump/cam seals...few more questions.

If you changed the impeller and it was put in right and it still overheats slowly. Then the next step would be the riser.It looks like it's original. Undo the boot and see what condition it's in.Do a flow test and see how much water flows.Then replace it.J

 

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

If you changed the impeller and it was put in right and it still overheats slowly. Then the next step would be the riser.It looks like it's original. Undo the boot and see what condition it's in.Do a flow test and see how much water flows.Then replace it.J

I fail to see how this could be the issue could you explain your thoughts?

He has established that there is no water leaving thruogh his exhuast, that would sugest in my mind the issue is eather a clog or he isnt getting any water in the system at all via the drive impeller.

Thus the reason I suggested he check to make sure he is getting water flow from the sea water pump from begining to end, and when he reaches the spot that water flow stops he would find his issue.

The only issue I could think of that would put the riser at fault is if the inlet that the water return hose connects to is clogged and it is the end of the system so why check it first. The seawater only goes into the riser so that it can exit via the exhaust.

 

[Bt Doctur]

Re: Merc 470, new waterpump/cam seals...few more questions.

Remove the outdrive, stick a water hose in the small hole and run the motor.
If normal temp is achieved then the trouble is in the outdrive.
If not, trouble is in the engine.
Untill you do this simple test , were just guessing you know how to do the repairs properly.
You MUST ISOLATE THE TROUBLE.

 

[Newbie@boats]

Re: Merc 470, new waterpump/cam seals...few more questions.

I am going to try to do what he told me to do tomorrow after work, then go from there...

I am searching for engines on ebay, think I found a pretty good deal, 1200$ for one, looks like it has about 50 hours on it, extremly clean, worth it?

 

[Eric 3.7LX Alpha 1]

Re: Merc 470, new waterpump/cam seals...few more questions.

Why its going to overheat just like this one. You've gotten some good advice here. It's up to you to do the leg work and locate the blockage. Your motor is not cooling off because it is not getting water from the muffs. Could be sand could be?? disconnect the hose before the voltage regulator WITH THE WATER ON TO THE MUFFS and see if you are getting water out of the hose. If not problem lower. IF so problem further down line.

 

[Newbie@boats]

Re: Merc 470, new waterpump/cam seals...few more questions.

Yes, I am going to disconnect to line next to the voltage reg, now..when I am checking this boat running or not?

So I will take that line off, have the hose turned ON and motor RUNNING?

Then if water comes out of that hose what should I try to do next?

 

[Bt Doctur]

Re: Merc 470, new waterpump/cam seals...few more questions.

If a good flow comes out at say 1000rpm, then you need to check the heat exchanger or riser for the restriction or blockage.
No flow: water connecting hose, water pocket cover, impeller

 

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

Yes, I am going to disconnect to line next to the voltage reg, now..when I am checking this boat running or not?

So I will take that line off, have the hose turned ON and motor RUNNING?

Then if water comes out of that hose what should I try to do next?

yes boat running, if you get water follow what i said the that same post. I even took the time to make you a diagram of the system....use it!

Follow the water lines, checking for the location that you stop getting water, that will tell you what the issue is.

I am pretty confidant you wont get any water from the first hose though. That means the issue is in the drive.

Report back to us and let us know whats up.

 

[Newbie@boats]

Re: Merc 470, new waterpump/cam seals...few more questions.

Yes, I will do that this afternoon, hopefully its just an impeller problem.

We'll see.

 

[msargius]

Re: Merc 470, new waterpump/cam seals...few more questions.

I had water in my engine... so when I took out the exhaust manifold and the riser apart, there where iron rusted flaks everywhere ... which blocked the water coming out...then I took off the 4" to 3" rubber boot that is hooked up between the riser and the exhaust elbow.... and looked down on the the exhaust elbow... the flakes, and the shutter where all in there doing more blocking .... had to clean all of that out, change manifold and riser...

You might have a similar problem... disconnect sea water hose out from your exchanger and run water though it if water is coming out no problem.... then it is time to do what I did.

By the way ... if the sea water is not coming out...time to check your oil. If your engine got water in it (milky oil) .. If the manifold is all rusted big chance that the water could be going to the engine instead of coming out....

 

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

Yes, I will do that this afternoon, hopefully its just an impeller problem.

We'll see.

I got my fingers crossed for you! It seems the PO didn't really take good care of things and that can be a very big head ache!

That heat exchanger can cost alot!

I will be back on around 6 tonight to check out what you found!

 

[Newbie@boats]

Re: Merc 470, new waterpump/cam seals...few more questions.

Hopefully I will start working on it around 6, im praying its something in the outdrive.

if the impeller is good then what should I go to?

Exchanger/riser?

Are they possbile to clean and reinstall them?

 

[billy4hp]

Re: Merc 470, new waterpump/cam seals...few more questions.

Hopefully I will start working on it around 6, im praying its something in the outdrive.

if the impeller is good then what should I go to?

Exchanger/riser?

Are they possbile to clean and reinstall them?

Make sure the water tube (top side of waterpump housing) was properly aligned into the housing and the grommet wasn't folded over blocking the flow...

If it's not that, re-read and re-read Solar's posts... He basically spelled out for you how to troubleshoot the cooling system (both sides) from there including a water flow drawing...

 

[nrob84]

Re: Merc 470, new waterpump/cam seals...few more questions.

listen newbie!!!! GO BACK AND READ SOLAR'S POST!!! i know everybody is trying to help. BUT DONT GET AHEAD OF YOURSELF!!!!! KEEP IT SIMPLE, FOLLOW THE HOSES, THEN WHEN YOU GET TO ONE THAT HAS NO WATER COMING OUT THEN YOU KNOW WHERE TO LOOK!!!!!! DONT GO BY WHAT PROBLEMS PEOPLE KEEP SAYING COULD COST YOU BIG MONEY!!! IT COULD BE A PEICE OF RUBBER, SAND, BARNICLE, WHO KNOWS..... ive been an automotive tech for 10 years, i also restore them and own a boat that i have done ALOT of work on. if there is one thing i have learned in my life its NEVER GET AHEAD OF YOURSELF, you will end up spending a TON of money on parts that didnt need to be replaced. if it isnt broke, dont fix it. sorry to "YELL" but alot of time peolpe chime in with storys of what has happened to them, and it does help ALOT but always remember just because it happened to him does not mean it happened to you...... good luck man.

 

[solar7647]

Re: Merc 470, new waterpump/cam seals...few more questions.

Hopefully I will start working on it around 6, im praying its something in the outdrive.

if the impeller is good then what should I go to?

Exchanger/riser?

Are they possbile to clean and reinstall them?

Not to be a broken record hear, but you need to follow the instructions that experianced people give you. The point of this forum is to help and pass information. We cant help you if you cant follow the instructions and report back to your findings.

We are not there so we only know what you tell us. If you keep skipping around the issue and just keep asking random questions, the experianced people that can help you wont, every time they see a post with your name they will pass it by. Now I have seen that you have already had that effect on the most experianced people on this forum with you previous post.

You have the attension of several people that are giving good proper advise, who also relizes your on the young side and we are being as patiant as possible because we all remember when we where in your shoes. Fallow, listen and learn!

Now with that said, you have to understand one thing, the cooling system of your motor is a lot differant from the normal cooling systems boat engines have.

A normal boat engine brings in sea water via the drive and cirulates that water through the engine to cool it, it then disposes of the water through the exhuast manifold and riser/exhuast elbow.

Your engine has what is called a freash water coolant system or closed cooling system. The coolant liquied is 100% contained with in the engine. The water pump in your drive brings in sea water ONLY to go through the heat exchanger, so that the heat from the coolant can be transfered to the sea water. The system then disposes of the hot sea water through the very end of the exhaust elbow where it is then spit back out of the boat via the exhaust system.

Now if your manifold or riser/exhuast elbow where the issue you would be loosing coolant. That isnt happening so we can rule those componets out.

Your issue of over heating is being caused because the sea water system isnt feeding water into the exchanger thus preventing the coolant from shedding its heat to anything, so it just keeps getting hotter.

So we need to figure out why the water flow from the sea pump isnt getting through the hole system. Look back at the post that I made with the photos. Follow the hose for the sea water system. Comen sence tells us that if you pull the first hose, muffs on, motor running and you dont get water or the water flow is really weak the pump in the drive is prob the issue, if you get water the pump is good so you have to follow the system untill you find the issue that is causing the water flow to stop.

Now you do the leg work, keep you head on and take the advice and you will learn alot and get that boat on the water!

If you cant do that, then I cant help you!

 

[Newbie@boats]

Re: Merc 470, new waterpump/cam seals...few more questions.

I am done with this boat.

I did everything I was told and followed the steps and the pictures and I just got over heating still.

I am going to look at a Bayliner tomorrow.

Thanks for everyones help and advice!