[boloranks]

hi guys, my friend just got a 25 or 26 foot 1988 imperial we took it out sat for a spin not even 5 minute in the drive the heating gage goes to the hottest point then we smell antifreeze. the motor cut off. this boat is fresh water cool we sit for a while for it to cool then restart and cruise back to the dock it over heat again even before we got back. please any advise will help. or what to change first before i call the mechanic.??

 

[lpv77]

possibility

Check the thermostat, maybe even replace it they are cheap enough. also find out if the manifolds are freshwater colled they maybe cooled by raw water. I would almost bet its the t-stat though. they stick closed causing the over heat condition the the prssure builds up causing the systemto purge where you would get you coolant smell from. Hope I helped. Vinny

 

[boloranks]

THANKS VINNY I TOOK OUT THE TUROMOSTAT AND RUN IT WITHOUT IT, IT RUN, AND ABOUT FOUR MINUITE I TOOK THE COVER OF THAT CONTAINER YOU PUT THE COOLANT TO AND IT START BOIL OVER REAL STEAMING IN ABOUT FOUR MIN. SHOULD IT DO THAT?? PLEASE KEEP THE INFO COMING GUYS

 

[seaslug44]

Does anyone think it could be a faulty water pump or a broken water pump impeller?

 

[lpv77]

ITs possible

I figured I would give him the easiest place to start.

 

[lpv77]

can be checked

Bolo,
you can check to see if the coolant is flowing aswell. remove the cap and run the eng. easier to check if t-stat is still out. watch the coolant in the canister and see if there is a level change with running or off. also see if you can notice the coolant physically flowing.

 

[boloranks]

I JUST NEED SOMEONE TO TELL ME THE HEAD IS NOT SHOT. LOL LOL ANY WAY GUYS I RUN IT WITHOUT THE THURMOSTAT I TOOK THE KORK OF THE INLET WHERE YOU PORE THE ANTI FREEZE AND IT WAS BOILING I MEANT RUNNING WITH SOME FORCE. SOMEONE TOLD ME MAYBE THE HEATEXCHANGE MIGHT BE CLOG WITH SEA WEED OR THE HOSES AH WHAT CAN I SAY KEEP THE INFO ROLLING GUYS. GOOD JOB TIGHT LINE. I HOPE I GET IT FIX BEFORE THE TOG SEASON START. TIGHT LINE

 

[621938]

if you think its the head

you can pull the spark plugs out of the jugs and inspect the plugs for water/coolant drops, this will tel you if the head or head gasket and what jug is effected

could be erroded water pump impeller or broken pump shaft, this you look for coolant moveing past(bubbles) the fill hole, remove cap...top off , start engine , warm up and observse thru fill hole for flow

no flow? either thermosat, or bad pump

the manifold stuff i dont know, i as outboard man

also be careful, you dont want to scald your face off, when these things are hot, hoses can burst melting your skin off with steam, or the thermosat is stuck it can unstick anytime your looking into the fill hole when the thermosat decided to open , your a cyclops

you should'nt play with it when it;s actually overheating, or within 2 hours till the core of the engine is cool enough, i am serious. you can get hurt real bad, if you dont know what your doing, stay away, not to make fun, but it sounds like your not experenced in cooling system troubleshooting, get a mechanic to do it

pressure test system, when under pressure look for actual physical leaks, i did not read in your posts if your finding coolant in the bilge or if the morot is burning it...where is the coolant going?

this will help diagnisis

1 look in bildge for lost coolant

2 i say pull plugs, and inspect for green droplets, water droplets, or if one or 2 plug is shiney clean, not matching the rest let us know the results

3 following the steps above, warm it up and look for flow, like others posted

4 pressure test

let us know above 4 and then you find the problem easy.

dino

 

[boloranks]

ONE LAST THING GUYS IF THE MOTOR IS IN NUTIAL IT REV VERY GOOD IF I PUT IT IN DRIVE ITS LIKE IT HAVE NO POWER. EVEN WHEN I PUSH THE STICK ALL THE WAY, NO POWER. PUT IT TO NUTIAL IT REV GOOD, WHAT YOU THINK CAUSE THAT??? THANKS.

 

[621938]

problem

bo0lo

did you fix the overheat problem?

pull the plugs? or anything else

its kinda tough to diagnoise with little information you give

does the prop turn? is it miss fireing or just no power, what does that mean.
i am still interested in the overheat before tackleing the power problem

it is possible you all burnt a hole in the piston or have a cracked head or block. need to answwer the 4 questions in my previous post. b-fore i can help you

how is she in reverse?

you all ever work on a engine of anykind before this?

dino

 

[615218]

boloranks, if the volvo outdrive is similiar to the mercruisers then the first place to check would be the raw water pump in the lower unit of the outdrive. You can check it by following where hose from outdrive comes into heat exchanger, disconnect and start engine for short period, about 10seconds, no more, and see if it is pumping raw water through heat exchanger. This is only a good test if boat is in water and not hooked up to earmuff on garden hose which would force water through any way. Good luck.

 

[boloranks]

OK GUYS BAD NEWS THE MECHANIC SAID IT IS THE MOTOR HEAD OR RINGS. I PULL IT OUT THE WATER TIME IS RUNNING OUT I WANT TO FISH,EVEN IF HE IS TAKING ME FOR A RIDE, JUST WANT TO FISH LOL LOL,THANKS ALL YOU GUYS FOR THE TROUBLE SHOOT,I REALY DO. BOLO GOD BLESS.

 

[Fishbust]

overheat...

Process of elimination. That is a very old motor.....and we can't tell you which of the many things that can cause this is causing your problem over the internet. You will have to narrow it down by eliminating one by one....

Remove output hose from water pump. Pumping water or not. If not, determine WHICH water pump is bad. Water pumps are always first on the list. Pull more hoses off one at a time to verify flow, flow to heat exchanger, flow from heat exchanger, flow to manifolds and risers.

No water in crankcase or if motor is never hard to spin over and if no steam around head gasket and if no billowing white smoke from exhaust and if all spark plugs look the same, then head gasket is likely GOOD. A motor with a bad head gasket that causes an overheat so quickly would have obvious signs.

Revving up great in neutral but no power in gear....based on the age of the engine....I would say you have an exhaust gas restriction, no place for it to go = manifolds/risers, the saltwater part of the cooling system. Take them off, they will be all clogged up, clean them out and re-install. If the situation improves, then it will be 'safe' to spring for the cost of new ones knowing it will fix your problem.

Hope this helps.

 

[621938]

k

rings would not overheat it, probally head cracked or blown gasket
, mechanic should know the difference, how good is this guy, this is basic

do a simple wet/dry compression test or pull the plugs and inspect like i says before

get the service manual and do the job in 6-10 hours with simple hand tools

dino

 

[boloranks]

THANKS AGAIN GUYS THIS EVENING I READ ALL YOU GUYS POST VERY CAREFULLY. I WILL TRY ALL WHAT YOU GUYS SAID, IAM NOT MUCH A MECHANIC BUT IAM A HANDY PERSON, LOL I WILL LET YOU GUYS KNOW HOW I MAKE OUT.

 

[boloranks]

ALMOST THERE

OK GUYS I AM BACK, FIRST I FOUND THE PROBLEM, THERE IS NO SEAWATER PUMPING FROM THE OUT DRIVE TO THE SEAWATER PUMP THE DRIVE IS A VOLVO PENTA I DONT KNOW THE MODEL NUMBER BUT I HAVE A LITTLE DESCRIPTION THIS IS IT THE REVERSE WAS NOT WORKING WHENEVER I PUT IT IN GEAR IT WOULD POP UP OUT THE WATER I JUST FOUND OUT THERE IS A PIN UNDRE THE BOTTOM THAT SHOULD HOOK THE DRIVE TO KEEPS IT IN PLACE OR IT WOULD JUST SWING OUT OF ANGLE, THIS IS THE I GOT ON DONT HAVE THEM TWO HIGOLIC THINGS TO KEEP IT IN PLACE. DONT KNOW IS I MAKE ANY SENSE JUST BEAR WITH ME GUYS. DOES THIS DRIVE HAVE IMPELLERS OR NOT??? OR WHAT PUMP THE WATER TO THE SEAWATER PUMP??? ANY INFO WILL HELP PLEASE.

 

[boloranks]

hi guys i am back. i think i found the problem,there is no seawater coming from the seawater hose that goes to the seawater pump.the drive is a volvo penta dont know the model number all i know is that it may be a 270 0r 240 it dont have them hydraulic trim it have that hook that lock on to the trim pin.does this system has impellers i dont know that what i want to know if no impeller, how does the seawater get to the water pump./?? i will be waiting for some repply. hopefuly tonight i want to do some work on it tommorrow. thanks and god bless. bolo

 

[621938]

here

i seen thais last post, i dont know the answer. it would make sense to have a pump in outdrive though as the water pump on the engine would not make suction to make itself primed,

would need a supply of water, could this be supplied by a primary pump in lower unit, if i was the designer i would put one down there....

this is my opinion anyway, i really dont know about these volvo penta outdrives

you should invest the 19 bucks in a service manual, the got em at all the marine stores

or call one of the marine stores tomorrow like i think freeport marine has volvo stuff ? 379-2610

or fred chall 868-0177 also in freeport

at least call and be nice on the phone and they answer that question and sell you an impeller

good luck

the water pump on my 97' gmc pick up is leaking last 3 days, gonna climb into the hood tomorrow in the morn and swap out a new one i got today, that is after i clean up all the branches that are clunking on my roof right now!

dino

 

[boloranks]

found gas in oil

guys i think i found gas in the oil what could cause that??

 

[621938]

fuel in the crankcase?

fuel in crankcase oil?

heavy odor of fuel in the oil or actual layer of gas floating on top of the oil is stuck carb float or other carb problem where its dumping so much fuel into the engine and the fuel/air mix is so rish, just washing down the cyulinder walls into crankcase, could cuase excess ring wear very quickly

take a good look at the carb. esp the foazt bowl. have it rebuilt

i had a vw bug one time that after 1000 miles there was 1 inch of gas floating top the oil!, was cracked fuel pump diaphram. rings werre shot after that, no oil control. go down the street like a skywriter. so check fuel pump also, gotta be come from sonewhere

sounds like you got a few problems to deal with with this boat. nothing cant be fixed though

dino