flaxterra

this started off with me trying to trace down a cooling problem. the boat is a 95 bayliner with a 3.0l mercruiser alpha outdrive. i had the boat on the lift with the foot in the water up to the water ports. started the boat, just like i always do and waited for water to come out, to ensure the motor is sucking water. well it didnt, so i shut down the motor before getting hot, trouble shot and trouble shot. i was able to hook the water hose to the foot and the motor would cool and shoot water out. so i thought must have been a seawater pump problem, never been changed. never had a reason to i guess. so i pulled the boat out of the water a brought it to my house. changed the pump. just about to start her up then decieded to change oil first. pulled the plug and out comes water/oil mix. uh oh. drained it all out, hoping for the best, put new oil in, pulled spark plugs to check for moisture. nothing. hoping maybe just condensation build up. anyways, started it up. i had the foot in a large tub to make sure it was sucking water up. well it didnt really seem to, not all the ports were covered with water, the tub was too small. pump water through with hose and everything is fine. shut the boat down and checked the oil and found a slight water/oil mix. i guess my question is: could this be a manifold/riser problem?? pretty sure its not the head gasket. seemed to run good and still dont see moisture on plugs. i just cant seem to understand why it wont suck up water?? would a manifold cause this?? i'm a auto tech so i have a little knowledge, well what relates to cars. any info??

Telum Pisces

Time for a lower unit rebuild with new seals and waterpump. Real easy thing to do. Give Tuna Man a PM. He could probably walk you through the entire process step by step. Hope you don't mind that I put you up to the task Ron.:moon

flaxterra

now im really confused cause i just changed the water pump, along with the seals that came with the kit, and how would water get in the engine oil?? not that i dont believe you, im just trying to understand.

sosmarine

I don't see resealing the lower unit unless there is water getting in the lube.

When you changed the pump, did you just change the imp or did change the gaskets and wear plates too?

I would first stick it back in the water and run it. Watch the temp. If the temp does get to high then let run for a while. Then check oil again. The milky look you have now could just be residue from the first time. If the oil turns real milky again I would say it is either cracked block, head or blown head gasket. It could just be between a oil and water passage and not a cylinder. I had one do basically the same a few years ago on a 3.0 Sea Ray. Not that the boat matters.

Telum Pisces

There is a water pump kit and a Lower unit seal kit also. But if you changed both, I would lean more too what SOS said. You can go to this website for a drawing of your lower unit with part numbers etc...

http://www.mercruiserparts.com/Show_...RD+ROTATION%29

<TABLE cellPadding=1 border=1><TBODY><TR><TD align=right bgColor=#ffffff>-</TD><TD align=left bgColor=#ffffff>817275Q4</TD><TD align=left bgColor=#ffffff>WATER PUMP REBUILD KIT</TD><TD align=left bgColor=#ffffff>817275A4</TD><TD align=left bgColor=#ffffff></TD><TD align=right bgColor=#ffffff>$143.90</TD><TD align=right bgColor=#00ccff>$124.48</TD><TD align=right bgColor=#ffffff>1</TD><TD><INPUT style="FONT-SIZE: 10px" size=4 name=817275Q4x44></TD></TR><TR><TD align=right bgColor=#ffffff>-</TD><TD align=left bgColor=#ffffff>26-816575A3</TD><TD align=left bgColor=#ffffff>SEAL KIT</TD><TD align=left bgColor=#ffffff></TD><TD align=left bgColor=#ffffff></TD><TD align=right bgColor=#ffffff>$76.80</TD><TD align=right bgColor=#00ccff>$70.28</TD><TD align=right bgColor=#ffffff>1</TD></TR></TBODY></TABLE>

flaxterra

i changed just the waterpump kit. thanks for all the great info. will do some more checking tomorrow. compression test and a larger tub to actually see if it is sucking water.

sniper

engine oil and sea water mixed?? If the boat has always been where the manifold is higher than the water level. I would susspect head gasket. If the boat was alowed to submerg a little I would suspect water through the manifold. Listen to SOS tho he should know.

__________________

Tuna Man

Now you ask....You know damn well I don't mind.

The Maintenance Shoppe

Its a 95' motor with original risers 13 years old...HMMMMMM...

__________________

The Maintenance Shoppe
Full service boat, pwc, and trailer repair
4048 Creighton Rd Pensacola, FL.
850-221-6789
www.themaintenanceshoppe.com

Tuna Man

No damn HMMMMMM about it. exhaust/risers good for 5-6 years maximum..for me anyway.

"waited for water to come out" do you have through transom exhaust or through prop exhaust?

First things first...Where was the water (milky oil) in the foot or the engine. Everyone seems to be reading foot, I'm reading in the oil pan.

13 year old exhaust/risers...Trash them, and I'm not kidding in the least. I have NIGHTMARE pictures of what can/will happen to the engine with a bad exhaust/riser. I wouldn't so much as crank a engine with exhaust/risers that old PERIOD. You see my pictures I'd bet you won't either. Maybe with cups only but NO way with a load on the engine.

<U>http://bpi.ebasicpower.com/c/MER9/Ex...r%20Mercruiser</U>

No way for water to enter the oil pan from the exhaust manifold, it can and will get into the cylinders. There are no water ports in the exhaust manifold that go/flow into the head. I'm thinking either 1) Cracked head..2) Blown head gasket..3) Bad intake gasket..4) Cracked block and or the cylinder wall. Eliminate the head gasket first by doing a compression check.

If you installed the impeller backwards it won't pump as it should. I'm thinking that even if backwards the vanes should flop in the correct direction, but as I have never installed them backward I can't swear that they will or won't.

There are other reasons why the foot will not pump to the engine driven pump...too many to type..PM me your phone number and I can call you. Be more than happy to help you along the way.

One more thing...when you do get it fixed ...never go from WOT to a dead stop if you can help it. Believe it or not COLD water can back feed up to the exhaust manifolds...HOT manifold and COLD water is a:nonono:nonono