raw water pump impellers i

[billnpat]

How often do these get changed??? and what's the main purpose of them??
my guess is to keep the raw water going through the engine to prevent over heating??:huh:

 

[carterchapman]

What - did w!ngless hijack your login?

 

[billnpat]

what - did w!ngless hijack your login?

Gee! Thanks:smt021

 

[tbirdvet]

This pump brings in sea water to cool engine and exhaust system. The engine also has a water pump that actually circulates the water through the engine. May need changing every 200-300 hours depending on running conditions (sand in water, temperatures, etc.)

 

[billnpat]

This pump brings in sea water to cool engine and exhaust system. The engine also has a water pump that actually circulates the water through the engine. May need changing every 200-300 hours depending on running conditions (sand in water, temperatures, etc.)

Thanks John

 

[techmitch]

Bill, the main purpose of the raw water pump is to bring raw/sea water into the boat in order to cool various components. Although the engine is the most important there are several other things that are conductive heat producers and require cooling also. In your particular boat the first things that come to mind are; fuel coolers, manifolds, risers, elbows, p/s cooler and so on. Hope this helps...

Sorry for the hammer............."What - did w!ngless hijack your login?"

 

[skolbe]

Depending on your environment should be replaced every 2 to 3 years.

 

[billnpat]

Thanks fella's I'm still learning and appreciate the help......:thumbsup:

 

[skolbe]

I personally think the impellers being changed is more important than the oil change debates. Keeping the engines cool is critical. Of course fresh clean oil matters as well, but overheating can cause some expensive damage.

 

[Four Suns]

I personally think the impellers being changed is more important than the oil change debates. Keeping the engines cool is critical. Of course fresh clean oil matters as well, but overheating can cause some expensive damage.

I agree 100%. It's amazing that everyone worries about what "Super Purple Synth Goop Non-Stick" stuff in the engine yet the #1 reason engines fail in the marine environment is due to the cooling systems not being maintained.

 

[gerryb]

Impellers are a PRIMARY element of a marine engine set-up and need to be serviced/changed accordingly. Never take them for granted and change them before they NEED to be changed...

(You never thought to ask on any of your prior 2,884 posts...? I guess someone with that much interaction on this site would be expected to know about something as basic as impellers...just saying..:smt001)

 

[jrock1062]

Bill I also boat on the Great South Bay and change my impeller every year as part of my yearly service. If you have Bravo drives it is an easy change if you have Alpha drives then the boat needs to be out of the water

 

[rondds]

I believe the maintenance requirement is every 3 seasons or 150 hours. Definitely on the list of "really important stuff to do regularly," along with oil changes, trans fluid changes (or drive lube), and riser/elbow gaskets.

 

[billnpat]

Impellers are a PRIMARY element of a marine engine set-up and need to be serviced/changed accordingly. Never take them for granted and change them before they NEED to be changed...

(You never thought to ask on any of your prior 2,884 posts...? I guess someone with that much interaction on this site would be expected to know about something as basic as impellers...just saying..)

Your right about that.....i should know....

 

[Scott W.]

I let mine go one season too long last year and it cost me. It went up while we were on a trip a long way from home. I wound up with an over 11 hour tow job and several thousand in repairs. (Thank god for tow insurance or it would have been a few thousand more.) Then I lost the use of the boat for several weeks last July. It is amazing how quick things go bad without cooling water flowing in the engine.

Scott W.

 

[rcknecht]

I changed both impeller last year. Unfortunately the previous owners changed the port impeller after it failed, and I peices of impeller in my heat exchanges... My port engine overheated again last week... I looked for the easy to find problems, and now I plan to bilge dive and pull out the port Raw water pump... My flow is not what it should be and have a new pump ready to go. Bottom line, don't wait until your impellers fail, replace them ever 3 to 4 years...

 

[Presentation]

.....You never thought to ask on any of your prior 2,884 posts...? I guess someone with that much interaction on this site would be expected to know about something as basic as impellers...just saying..

Let’s get these questions out of the way in one string.


What’s that screeching sound that comes from the port lounge?

 

[Alex F]

IMO and as far I was advised by mechanics 3-4 yrs is way too long for impellers replacement period. It's best to change them every spring (yes, in spring so the vanes to sit collapsed in the same position all winter long), but if you know that your engines never sucked anything like silt, sand or worst, then you should be ok to go for the second season. On the 3rd season your risk of failure encreases. Thus, if you understand that cooling is just as important or even more important than oils, then you understant that it's not not wise to take that risk. BTW, you guys change oils every year, so if impellers just as important........you get the picture.

Just my .02c.

 

[carterchapman]

(You never thought to ask on any of your prior 2,884 posts...? I guess someone with that much interaction on this site would be expected to know about something as basic as impellers...just saying..:smt001)

That where I was coming from Bill - I thought you were hacked - sorry for the "false accusation"!.

 

[Presentation]

I agree with Alex F.

The most difficult do-it-yourself impeller change is the first one. The hardest part is getting it into your mind that yes, you can get your body flat on the bottom of your bilge laying side to side.

I have a 280 Sundancer with twin 5.0’s and I’m 6’2” and WAS 253 lbs (now 221) and if I did it you can do it.

Having this done for you is about $350 per engine. A little less at some places, a bit more at others.

For those of us with Bravo drives, the impeller kit 862232A 2 costs $33/each @ JMS online.

The most exotic tool you will need is a deep 9/16” socket.

The job will take about 3-4 hours the first time you do it. The worse part is learning how to fit your body down there. The next time it will take 2 hours. It will take under 2 hours after that. If you get good at it by doing it every year you may get yourself down to 1 hour but that means you are good, fast, and limber.