I have a 115hp 4-stroke EFI Merc ourboard that stays in Baja. Last trip down we did the annual maintenance: engine oil/filter, lower end gear oil,
lube points, fuel filter both in-line and the smaller one in the motor. I did not replace the impeller as I do that every three years or 300 hours
which for me is about the same and next year will be three for the current impeller.
On our last day we hooked up the hose to the engine to flush it, turned it on to idle for 10 minutes and in two or three minutes the over-heat alarm
came on. I let it cool, turned it on and the same thing - this time I noticed no water coming out the pee-hole.
Once back NOB I go to the dealer and he says my impeller is bad and in fact, it should be changed every year and I quote, "because of where the boat
is stored".
Fine, so I buy an impeller kit but later on my buddy wonders why everything worked fine for 4 days, including that very morning, but as soon as we
pull it out, no water? We're thinking that maybe under power the impeller is still able to pump some water but at idle no? Is this possible? Do you
guys change your impellers each year?
They also told me to plug the hole with tape when I'm away to keep bugs from setting up home in the pee-hole. That's probably a good idea.
I always thought only some of the water came out the pee-hole so the driver could see that water was being pumped, the rest flowed out the lower end.
Am I wrong about this?
By the way, I was able to get the shop manual for this engine on eBay in disc format for $8. Not the owner's, the shop.
every other year is what i've been told. the parts are fairly cheap and would be easily do-able on a warm BOLA morning after you unpack. might as well
do the water pump too!
but then again, i'm just getting started on this private boat thing....
Ok, I should of spent more time reading the shop manual before posting. I found a water diagram and a little of the water is shunted to the Tell-Tale
(not the pee-hole). It looks like a pretty small tube so could easily get plugged.
By the way, I got the impeller kit with the gaskets, o-rings, etc but not the housing.
Hola,,,If Your "manual" is a seloc,chilton or a haynes..UMMM !! thats good fire starter !!! LOL get the real mccoy...if its a honda, the BOOK will be printed by honda...if its a yamaha,its printed by
yamaha..Very big difference !! and I strongly reccomend new impeller yearly..cheap !!I'm trying to diagnose your post..the diapham would be the poppet
valve ???..K & T...out for the afternoon !!!
I found this great video so between the few I've done in the past and the Merc shop manual it's a simple enough procedure. I will need to run this
thru Google translater though....
santiago:
i just had my impeller replaced by a shop. because the impeller was set from either heat or non use the water wasn't pumped properly and it messed up
the housing which had to be replaced. shop guy recommended changing the impeller each year or 100 hours. the housing comes with an impeller kit.
if there is any impeller residue on the housing it will mess up the new impeller.
Hola, as a 52 yr old mec/tch I can tell you that there is lot a varibles on impeller design,wear and tear factor and The Biggest, lack of use !! No
way on every 100 hrs..thats a joke!! the main reson a impeller needs to be changed yearly is that when not in use they get a "SET" and will be fine
on a garden hose but asking it to work out on the bay is a whole different storey..the blades have to snap in a offset circle and when they lose there
flexible service they just dont pump correctly..and at higher speeds the vanes must also flex to allow the water to pass the vanes for high volmes of
water to pass as the boat moves through the water..sorta by passing the impeller if you will ...and if you want to change it yourself,,first have a
real boat mec walk you through it as there is a LOT of tricks and things to look for!! I have watched a lot of vids on you tube and and read Iboats
and its ALL BS..there is this one yahoo who even puts grease (A no/no) in the waterpump housing..so dont put off getting your impeller serviced!! no.
1 reason for blown pwr heads/overheating!! K&T
HOLA,,THATS FUNNY !! HEY,,I got a good drill..need some teeth work done ?? my point? do you
want to f/up up a $ 9k motor after watching a yahoo who thinks he has a clue.. K &
T
I use a light coating of silicone grease on my impeller housing and change the impeller about every three hundred hours. No failures yet. What am I
doing "wrong" by using grease? Especially if it's an outboard, with no sea strainer.
I avoid the Sierra impellers and the Sherwood impellers. I use Johnson Pump impellers. They are neoprene.
Volvo diesel, not an outboard.
We have temp gauges, so the #1 cause of blown power heads is inattentive skippers.
JOHNSON and volvo(which is johnson) impellers come with Glycerine ( had to run to car& get tube to spell right) and when in the bush might use
dish soap !! but oil.grease.screws with the rubber from the first minute of contact !!I myself as a young lad made the same false asumtions..live and
hopefully learn !! you are taking the time to at least learn boats...most folks assume !!K&T
LET ME GUESS.......KAD 42 OR KAD 46 SERIES WITH SMALL TURBO AND SWICTHING COMPRESSER ??? K & T PS..SILICONE IS NOT PETRO/GREASE..AND IF YOUR RAW WATER PUMP IS HIGH UP PORT SIDE I HAVE A LITTLE STORY TO SHARE
W/YA !! K&T OUT
No. Older 41A diesel. Turbo and aftercooler is all. 2300 trouble free hours, so far.
I have the sea strainer out right now as it began leaking SOMEWHERE. Either one of the tubes leading into the strainer or possibly from the impeller
housing (but not the faceplate).
Having trouble freeing the impeller housing from the water line below it. First time I've done anything but replace an impeller on this system.
Hoping it's not the seal at the back side of the impeller assembly as it's driven by (and lubricated by) the same mechanism as the injection pump. But
I see no signs of salt water intrusion into the crankcase oil.
Okay, I have had three different boats in Mexico and I do a change every two years. I do a lot more hours than you do but still the every other year
seems to work fine. You have a Merc but it was built by Yamaha so the motor is pretty much the same.
You probably had some break down in the impeller which still allows water to flow, so it was ok when you were out fishing, but when you were in
rinsing, the flow is restricted more. On the new Yamaha's with the hose connection, the factory does not want you idling the motor when connected
only to the hose, you really need to use Mickey Mouse Ears for that.
HOLA,Craftman sells a handy tool called a cotter pin removel tool that makes hose removel alot easyer !! its more or less a 90 angle pin that you
start under the hose end and run it around to break the hose free !! best little tool in my box!! ..I/O'S and inboards have a lot of hoses...volvo's
ROCK SOLID !!! K & T PS just saw pescadors post and yes the pwr head is
a yamy and I always recomend flushing with the muff's..K & T
Hola,, NOT the same..but close..if your haveing the hose stuck to the pump the tool that I use can be pushed in between the hose and the pump "barb"
and you run it around as much rooms allow to break the "seal>>>>> I guess in a pinch you could take a 90 allen wrench a grind the 90
at the tip to work.. the craftsman tool is cheap and I myself could not do a inboard without it..I know because I have had to help folks out at the
ramp on few times I did not have my tool bag with me... funny thing most folks assume that you can loosen the hose clamp and it will just come
apart..NOT !! K & T
Hola,as always Im confused???? is the pump or the strainer thats leaking?? or all of the above..sometimes I have gone to real auto parts store and
used the blue light stuff to find a leak and the last time it was on a volva KAD 42 sweet diesel engine..did ya catch that?? LOL K&T
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get the real mccoy...if its a honda, the BOOK will be printed by honda...if its a yamaha,its printed by
yamaha..Very big difference !! and I strongly reccomend new impeller yearly..cheap !!I'm trying to diagnose your post..the diapham would be the poppet
valve ???..K & T...out for the afternoon !!!
