alpha one no or very very little water exiting through prop or exhaust relief ports.

[Bondo]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

the problem is boat over heats when on plane or under throttle with a load. cools right back down when idling or putting along at 1000 or so rpm.

what i have noticed so far=

very very little if any water exiting the relief ports or through prop exhaust passage.

replaced the impeller in the out drive. the old impeller had 1 fin left on it. the rest were missing. i found a few small peices in the thermostat housing " there was no thermostat in the housing" pulled hose off the thermostat housing water comes rushing out. pulled the supple line of coming from the lower unit through the transom at the thermostat housing flows lots of water.

removed the manifolds, risers, and elbows - the gaskets from the manifold to the riser had 2 ports and a very small pin hole on the other passages, as apposed to being open.

removed some scale and sand and rust debris from the manifolds and risors, also the same from the block drains on either side of the lower block, poked around with a wire and it poored out with the water in the block.


i am getting water to the thermostat housing.
i do not know if i am getting water flow through the block
i do not know if i am getting water flow through the intake manifold.
i am not getting water flow out the exaust/overboard.
i am getting water flow to the exhaust manifolds.

i am planning on doing some inspecting tomorrow all day. what should i be looking for maybe the water circulating pump on the engine?

my plan is to inspect every hose, and item in the cooling system starting with the water supply on the in side of the transom.

Ayuh,.... Have ya put a T-stat into the T-stat housin',..??

It won't flow right, without it...

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

Ayuh,.... Have ya put a T-stat into the T-stat housin',..??

It won't flow right, without it...

would having no thermostat cause there to be no flow out of the exhaust?
im assuming with no thermostat the water would take the path of least resistance, and make its way over board? correct me if i am wrong.

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

Also check for sand and scale in the lower portions of the block..

when i winterized the motor i removed the 2 drains on the bottom of the block, nothing came out. i then took a piece of wire and poked it into the holes, the water began flowing out along with what appeared to be sand and sediment.

does this indicate anything? like that the block could be clogged up? i stated earlier that i only found a few small pieces of the lower units water impeller, and that all but one was missing, im thinking that maybe the remaining peices might be blocking the system.

another thing im thinking is that this old style 78-82 cooling system that i have on L033402 engine might not be installed correctly? the gaskets between the risers and manifolds had 2 open passages and 2 with a small relief hole, as aposse to being wide open.... what is the correct way to set this up.

does any one know what manual my engine uses, so that i can start running tests and fix this problem.

 

[Bondo]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

would having no thermostat cause there to be no flow out of the exhaust?
im assuming with no thermostat the water would take the path of least resistance, and make its way over board? correct me if i am wrong.

Ayuh,... The water is pumped in from the outdrive, 'n it exits out through the exhaust, T-stat, or not...
But,...
Without the t-stat in place, the motor will see hot spots, because of bad water flows...
The t-stat directs the water through the t-stat housin'... in the Right directions...

Have you LOOKED for a P/S Cooler under the motor,..??
Does it Have P/Steerin',..??

Yer coolin' system needs the riser gaskets ya got,.... Those holes are supposed to be restricted...

another thing im thinking is that this old style 78-82 cooling system that i have on L033402 engine might not be installed correctly?

Post up some Pictures of this beast, 'n maybe We can figure out what sorta Frankinmotor ya got...

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

Ayuh,... The water is pumped in from the outdrive, 'n it exits out through the exhaust, T-stat, or not...
But,...
Without the t-stat in place, the motor will see hot spots, because of bad water flows...
The t-stat directs the water through the t-stat housin'... in the Right directions...

Have you LOOKED for a P/S Cooler under the motor,..??
Does it Have P/Steerin',..??

Yer coolin' system needs the riser gaskets ya got,.... Those holes are supposed to be restricted...

Post up some Pictures of this beast, 'n maybe We can figure out what sorta Frankinmotor ya got...

i took of the thermostat housing and all of the cooling hoses. i didnt find any peices of the impeller, but under the thermostat housing i found what appears to be flaky peices of soft crumbly rust........ any ideas? should i take of the circulator pump and fluch the block and head out some how?

thanks for the help guys i really appreciate you taking time out of youre day to look at this and give me some advise.
JAmes

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

the circulating pump mounted on the front of the engine has nothing to do with dumping the cooling water out the exhaust, that is all accomplished with the sea water pump in your drive

tough to get a good idea as to how your cooling system is set-up with every hose and the manifolds removed, not to mention how small the picture is


you say you have good flow from the drive up to the t-stat housing??

you have good flow from the top of the y-pipe out the transom idle relief ports??

if so, then you issue is somehwere after the t-stat housing and before the top of the y-pipe, NOT including the engine - i.e. the hoses to your manifolds/risers or the manifolds/risers themselves

i would be suspect of material built up inside the manifolds/risers, pressure testing them does you no good - a blocked manifold will hold pressure

you need to check how well water flows through them

i have the old log style manifolds, so i am going to replace them now that they are off. when i tested them with gas after the pressure test the water filled from on end and out the other, could they still be clogged enough to cause overheat? my guess is that by judging by the amount of scale under the thermostat housing that the water may not be going through the head/block, an might be taking the easiest rout to the exhaust? i don't really know what else to check. houses are clear, water flows to the thermostat housing, steering cooler is clear, just lots of crud in the engine, intake. any ideas? how can i flush the block/ manifolds out with the engine in its current state, ie with out running it.

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

the exhaust manifolds/risers need a constant supply of cooling water flowing through them, this is provided by the seawater pump in the drive

even if the engine block was completely plugged and no water was flowing through it, the manifold/risers would still be getting water through them and exiting out the y-pipe - understand?

how can i flush the block/ manifolds out with the engine in its current state, ie with out running it.

pull the large circulating pump hose off the t-stat housing (top), with both engine block drain plugs/petcocks OPEN, pour liquid (water, antifreeze, etc..) down the hose and look for liquid exiting the block drains

again, even if the block, heads, and intake manifold were completely blocked there still should be water flow through the exhaust

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

the exhaust manifolds/risers need a constant supply of cooling water flowing through them, this is provided by the seawater pump in the drive

even if the engine block was completely plugged and no water was flowing through it, the manifold/risers would still be getting water through them and exiting out the y-pipe - understand?





pull the large circulating pump hose off the t-stat housing (top), with both engine block drain plugs/petcocks OPEN, pour liquid (water, antifreeze, etc..) down the hose and look for liquid exiting the block drains

again, even if the block, heads, and intake manifold were completely blocked there still should be water flow through the exhaust

thank you sence the thermostat housing is off, can i just poor water/coolant into the hole that the thermostat housing bolts to?

thank you for explaining that the water will go out the exhaust regardless of blockages in the engine. so basically that leaves me to believe that i have an obstruction in the y pipe or the manifolds. i am replacing the manifolds so that would leave the y pipe..... am i correct in that assumption? that those are the only 2 things that will stop water flow over board? i will bring my bore sight home form work tomorrow and look around the y pipe..... i did pour coolant down the tops and it all came out the bottom......

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

Osco (4 inch) MerCruiser 350 5.7 Center Riser Exhaust Manifold Kit (1980s-2002) - MercExhaust.com


i am planning on purchasing this kit, will it work on my engine 0L033402 = serial number.

thanks again guys. the putting around at 1100 rpm to avoid overheat has to stop before this season starts...

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

you need a different t-stat housing to use those manifolds

yours now has extra outputs for the risers - the center rise manifolds do not use separate hoses for the risers

yes, you can pour a.f down the intake port to see if it flows out the block drains

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

you need a different t-stat housing to use those manifolds

yours now has extra outputs for the risers - the center rise manifolds do not use separate hoses for the risers

yes, you can pour a.f down the intake port to see if it flows out the block drains

thanks, ill flush the block as you have described. also, can i just close the 2 additional ports on the thermostat housing and use it with the new manifolds?

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

can i just close the 2 additional ports on the thermostat housing and use it with the new manifolds?

i dont know, there may not be enough flow to provide sufficient cooling for those manifolds with the old style t-stat housing

your best bet is to either order log style manifolds and risers or update completly to the new style - hoses, housings, etc...

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

i dont know, there may not be enough flow to provide sufficient cooling for those manifolds with the old style t-stat housing

your best bet is to either order log style manifolds and risers or update completly to the new style - hoses, housings, etc...

do you know of a good place to get the correct thermostat housing and some hoses with out brakeing the bank. i agree and would like to do this the right way

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

probably here on iboats for price, otherwise...

your local merc dealer, they will be able to order the correct OEM parts for you, or...

ebay, but who knows the condition of the used parts there

 

[QC]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

Better look at your pics:

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

judging from the bigger pics there you may have some issues other than cooling you might need to take care of

is the alternator marine rated??

electric fuel pump?? wired to oil pressure switch??

other issues not shown in the pics??

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

judging from the bigger pics there you may have some issues other than cooling you might need to take care of

is the alternator marine rated??

electric fuel pump?? wired to oil pressure switch??

other issues not shown in the pics??

alternator is marine rated. 16 years old, but marine rated and working well.

fuel pump is electric. as far as its wiring, or any of the wiring on the engine...... its a mystery. this is how i purchased the boat.

while i have the manifolds off and there is so much extra room i am also planning on re wiring it correctly, which is why i would like to find the correct manual for this "engine 0L033402" if you can see anything that should be wired differently or better yet how i can view the correct manuel for this engine i would greatly appreciate it.

thanks again guys for taking youre time to help me with this.
QC : thanks for enlarging those pictures for me so that people can see what im working with.

 

[dubs283]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

as far as getting a manual there are others here who can get you a link to download one, i do not have any of that info myself

start a new thread requesting a manual for your engine and drive, someone will post a link for you

you wont find any info in that manual about electric fuel pumps though, mercruiser didnt use them on the engine you have - and they need to be wired a certain way for safety reasons

keep in mind as you run into different issues with your boat you must start a new thread for each item, bunching everything into one thread gets confusing and difficult to read through for people helping and others looking for information

 

[Bass2mouth]

Re: alpha one no or very very little water exiting through prop or exhaust relief po

as far as getting a manual there are others here who can get you a link to download one, i do not have any of that info myself

start a new thread requesting a manual for your engine and drive, someone will post a link for you

you wont find any info in that manual about electric fuel pumps though, mercruiser didnt use them on the engine you have - and they need to be wired a certain way for safety reasons

keep in mind as you run into different issues with your boat you must start a new thread for each item, bunching everything into one thread gets confusing and difficult to read through for people helping and others looking for information

thank you, i will post a new thread requesting the manual.
do you know what fuel pump the 0L033402 engine uses?