Motor service , water pump , yes / no

[grex]

I have a 2 YO 70hp s Yamaha which is due for 100 hour service.
In discussions with the dealer he suggested the water pump should be replaced. Cost t$ 250.00

In checking the hand book there is no mention of the W.P. on the 100 hr service.
It dose appear on the 200 hr but inspection only (whatever that means)

Guys , ,what do you think , necessary or just a good idea on the day by the dealer

For reference , the boat is used in salt water once or twice a month. Thoroughly flushed
with fresh after each trip & never cranked over or run when not in the water / flusher.
The tell tail is as strong today as when first purchased

Also , dose any one know if the impeller is normal rubber , neoprene or some other
type of compound. Is the wall of the housing lined with a stainless steel sleeve
or just plain machined die cast

Tks
Geoff

[toymod]

I would do it for peace of mind, is that just the impeller for 250 fitted as thats a rip off i recon, but if you feel confident about it leave it its all upto you in the end

[finga64]

Gidday fellas,
For the $250 that would be a complete water pump you would think, as an impellor is usually under $100 (guys correct me if I'm wrong as I go to a guy i trust and just give him the money).

At 100hrs I'd doubt if the pump housing would need changing unless you like dredging sandbanks a lot.

After 2 years I'd change the impellor (then you have a good spare just in case it stuffs up on a public holiday or at 5.00pm on a Saturday) and just have a gander at the housing.

[Angla]

grex,
Sounds a bit early for me unless he has explained a reason for early failure
Is he a Yammie dealer or could you seek advice from a Yammie dealer?

Angla

[ahoj]

Replacing a impellor for yamaha motor parts 33$ and if the casing is OK (stainless steel) you can replace it yourself in about 45 min perhaps your old one after 2 years is a normal time to replace the rubber impellor---- they move about @ 4000rpm 240.000 rph add 2 years say one month of boating I say no more... replacement would give you a peace of mind -- I would replace mine

Ahoj

[grex]

Tks for the feedback

Regarding the cost, , a figure of $350.00 was mentioned
for the 100 hr service &pump. Perhaps I misunderstood the split

An interesting comparision , E Tech say first service at 300 hrs.
For the normal boater this would be 4 - 6 years.
Have Evinrude found the secret of longevity for W.P. :o
Regards
Geoff

[Roo]

i think the etec service is 3yrs or 300hrs. whichever comes first.
not sure but sounds familiar. most manuf. have service intervals at either hours or months whichever comes first.

roo.

[QldKev]

I've already kicked up enough stir for the week 8-) 8-); but one of my water pumps it 6 years old. The way I look at it, if its pumping a good stream of water leave it alone. If you do lots of sand digging maybe you would have to replace it more often. Just ensure you meet any manufacturers warrenty.

[MulletMan]

Irrespective of the age of the motor, a lot depends if you have been doing a lot of "dredging" in the shallows of sand and mud etc. If so there is an excellent chance the impellor is badly scored and likewise the housing. I shout myself a new impellor every 100 hour and insist on S/S housings. Make sure the dealer shows you the old one (if you can trust him!)

[finga64]

Sorry QLDKev, but any number of vanes can drop off due to old age.
One vane dropping off not much of a worry. 2 vanes dropping off, still no worries then all of a sudden you have 1 or 2 vanes left. BIG worry.
Change the impellor at least..
old impellors=big troubles
The cost of an impellor= less then $100.
Motor rebuild=big troubles=$ lots and lots
You do the sums ;)

I don't leave the spark plugs in til they stop sparking. Do you??
Same principle

[Leo_N.]

Way to understate it Finga.

I would be shocked if you needed a new housing after such a small time, but the water moving through that pump is the lifeblood of your engine. I get my impellor changed every service. It is just a piece of rubber and never seems to have any damage when I see the old one, but that is preventative maintenance - making sure nothing goes wrong.

For a reference i got my old Yammie 50hp serviced for $250-300.

[toymod]

unless you can presure test it the water coming out of your tell tail is a guide, what if it isnt flowing 100% only 60% how hot is your motor running at......might be alright for another 6years might go tomorow its all up to you how much you want to gamble me.....Saftey first if your worried about a few bucks you might want to consider another hoby where the outcomes are not life threatening........


Cheers


Dave

[Mantaray]

so why do some people go to all the trouble of only doing half the job? some go to all the trouble of pulling the whole shebang down then generally only replacing half the problem thinking they are saving a few $$'s

[rogue2527]

mate i doubt the water pump needs doing. at best you would think the impella ruber is a bit week but not the whole pump. but then a gain i am not an engineer. check with another mechanic.

[Oldyella]

My 0.2c..

The impellers often don't slowly wear out. The become delaminated from the brass bush on the keyway. So they can fail immediatley without warning and will distribute pieces of rubber through the cooling system blocking passages and leaving you stranded. The bits of rubber are hard to flush out. The general view from the big international forums is to replace bi-annually no matter how many hrs and NEVER run dry.
I once had one in for 4 years with no failure, but did have an auxiliary motor just in case.
I won the game of russian roulette, but you gotta ask yourself. "Do you feel lucky"
8-)