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sama 
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Joined: July-28-2010
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 Topic: overheating
Posted: July-28-2010 at 7:21pm |
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my 1994 sport Nautique has a ford 351 pro boss that over heats at very slow speeds. I have replaced the impeller and there are no air leaks. the water filter canister has been replaced and it keeps temperature at speeds exceeding 2200 RPMs. Please help
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8122pbrainard
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Joined: September-14-2006
Location: Northfield Il.
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Posted: July-28-2010 at 7:45pm |
Originally posted by sama
I have replaced the impeller and there are no air leaks. |
Are you sure? Fill us in on why you feel this way. A low speed high temp problem is usually always a sucking air issue. Shaft seal on the RWP?? hose connections???
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sama
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Posted: July-28-2010 at 8:12pm |
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everything is sealed, I know it should be a sucking problem. I have been told to check the intake grate on the bottom of the boat
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8122pbrainard
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Posted: July-28-2010 at 9:35pm |
Originally posted by sama
everything is sealed, I know it should be a sucking problem. I have been told to check the intake grate on the bottom of the boat |
Yes, it is a sucking problem but you still haven't mentioned how you are determining that you do not have a issue between the RWP on the through hull.
And.... what about the RWP seal? What's up with the through hull? If someone is leading you in that direction, I feel it's the wrong one. It takes quite allot to plug one up!!
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LaurelLakeSkier
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Location: Wisconsin
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Posted: July-28-2010 at 10:01pm |
Originally posted by sama
the water filter canister has been replaced and it keeps temperature at speeds exceeding 2200 RPMs. |
Another area you should look at is the O-ring gasket that seals the water filter. If it is kinked or not seated (or missing), it could be the source of your leak.
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The world is full of youth—what we need is a fountain of smart!
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kapla
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Posted: July-29-2010 at 4:03pm |
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is it possible the RWP pump was assembled reversed after the impeller change?
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behindpropeller
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Joined: July-31-2006
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Posted: July-29-2010 at 4:06pm |
Originally posted by kapla
is it possible the RWP pump was assembled reversed after the impeller change?
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Thats not it.
I suggest taking a piece of 1" hose and hook it to the rwp on one side and put the bucket on the opposite side with a hose running into the bucket. Let it SUCK from the bucket! Let your boat idle and monitor the gauge.
If the boat stays cool your problem is before your RWP. If the boat heats up it is after your RWP or your rwp.
TIm
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MACS81SN
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Posted: July-29-2010 at 10:26pm |
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I just pulled a wad of seaweed out of my transmission cooler which had blocked off about half the tubes. Somehow the seaweed got past the water strainer. Ran too hot at idle but only a bit warmer than normal at speed. Exhaust manifolds were way too hot all the time.
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Mark
81 CC SN - 351W (+0.040, GT40P - ported, Edlebrock Perf.)
68 CC Mustang - 289
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blink
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Posted: July-29-2010 at 11:02pm |
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maybe check to see if your pick up hose is collapsing, what is your temp gauge reading at idle and did you change your thermostat
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BTW looks like I lost my 82-2001 to sanity
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Hawktique
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Posted: July-29-2010 at 11:25pm |
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Not to beat a horse, but thermostat would be a good check. Then the hose troubleshooting technique tracing back to find a bad spot is a great idea. I had the same problem, the crack in the hose was on the bottom inbord side of the tranny cooler. Fixed it right up, of course after already trying the impeller, RWP seals, and thermostat.
PS: I thought my hoses looked fine too.
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"A Veteran is someone who at one point in his life, wrote a blank check made payable to: 'The United States of America,' for an amount of 'up to, and including his life." Semper Fi
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behindpropeller
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Posted: July-30-2010 at 8:38am |
Originally posted by blink
maybe check to see if your pick up hose is collapsing, what is your temp gauge reading at idle and did you change your thermostat |
Think that through.... Don't you think it would collapse if it were at higher rpms pulling more suction.
Unless you start with an educated plan to rule out one part or another you are just a parts changer.
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blink
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Posted: July-30-2010 at 5:02pm |
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Just trying to help a fellow nautique owner out. Didn't imply he start overhauling the engine,or like you said throw parts at it. But sooner or later he will have to. or (be a parts changer).
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BTW looks like I lost my 82-2001 to sanity
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8122pbrainard
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Posted: July-30-2010 at 5:08pm |
Originally posted by behindpropeller
Originally posted by blink
maybe check to see if your pick up hose is collapsing, what is your temp gauge reading at idle and did you change your thermostat |
Think that through.... Don't you think it would collapse if it were at higher rpms pulling more suction.
Unless you start with an educated plan to rule out one part or another you are just a parts changer. |
Tim and John,
IF the suction side hose is wire reinforced, (should be) it will not collapse. The rubber impeller type pump doesn't produce that much Suction "head". They are considered to be a "semi" positive displacement pump.
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