Replacing A Yamaha Impellar

[Fish Assassin]

How hard can it be?

Stainless breaking... Bolt heads striping. Is this normal or is this just because it's been so long since it was changed.

I have stopped and taking 5. Not sure what to do at this point. Take it to Parker..... Take a hammer to it. Buy a new motor.

Do I cut the heads off drop the leg then try to remove the bolts?

What should I do?

 

[scott craven]

Sounds like one of my jobs....
give them a good spray with wd40 and try heating up the bolts with a propane torch
just don't strip them or you're hooped.

 

[Fish-Hunter]

Sounds like one of my jobs....
give them a good spray with wd40 and try heating up the bolts with a propane torch
just don't strip them or you're hooped.

X2

We do our Yamaha Kicker every year now just to be sure that the impeller is always a good one and also to keep those damned bolts working. Aluminum and Stainless do not get along and when they "fuse" together it is sometimes like they have been welded. Heat and thread penetrant worked for me the first time we did ours. I was almost the point of cutting, dropping the leg and then removing, but they did come out and now we change regular - it's worth it.
Good luck!

 

[Fish Assassin]

I got all but one out. It broke. After the leg was off I used a pipe wrench to remove it. But where do you get a replacement? Parker for $12 each thats $60 for 4. Ouch. Tried the fastener shop. They don't have them in stainless. But they do have them in reg. steel for about $1 each.

This is never ending... Do I get the tap set out and make new stainless bolts work? Or pay the $60 or just $15 as I guess I could reuse the other 3 at that price.

Why did I even start?

 

[spring time]

I had the same thing as you on my duck boat motor. ended up cutting along the bolt and nock it out with a hammer them taking to my local machine shop to get them to weld a stud in it works great. I have now put neverseize on it hope that works. quess every winter a guy should just back the bolts out a couple of turns then re torque them

 

[profisher]

Every spring I remove each bolt one at a time, lube it with marine grade never-seize and reinstall. I drop the leg and replace the impeller every 2nd season. I've done the same with most of the important bolts on the motor...engine mount bolts, water jacket bolts etc.

 

[Fish-Hunter]

I got all but one out. It broke. After the leg was off I used a pipe wrench to remove it. But where do you get a replacement? Parker for $12 each thats $60 for 4. Ouch. Tried the fastener shop. They don't have them in stainless. But they do have them in reg. steel for about $1 each.

This is never ending... Do I get the tap set out and make new stainless bolts work? Or pay the $60 or just $15 as I guess I could reuse the other 3 at that price.

Why did I even start?

Make sure that what ever you get is 316SS or better grade. The orriginals should be this or better.

If the 3 that did come out OK are in good shape. Not twisted at all on the shoulder or shank of the bolt, and the head of the bolts are good then keep them and replace only the one. Otherwise replace the buggered ones also. $12.00 each is steep (a bit of a gouge) but what do you do? Lube up before you go in to get them. (Did you say that you only wanted four bolts not the box??) Maybe someone knows of a better price that they have seen????

Definately give them a work out every year to keep them moving. I did not use any neverseize on them, just some oil, wasn't sure about the reaction of the aluminmum to the neverseize if any.

 

[Fish-Hunter]

Every spring I remove each bolt one at a time, lube it with marine grade never-seize and reinstall. I drop the leg and replace the impeller every 2nd season. I've done the same with most of the important bolts on the motor...engine mount bolts, water jacket bolts etc.

Profisher:
Are you using the Yamaha 9.9HO four stroke?

How does your impeller look after two years? Any cracking? How much rebound in the rubber fins?

Might look at trying to get two years also if that works.

 

[profisher]

FH, I should have elaborated a bit more. This is what I do every year on the 200 HP Yami. I do have the 9.9 HO but this is the first on I've ever kept more than 2 years. (because they are not made anymore and I'm not sold on the bored out 8hp) Up until now I've always sold them after the 2nd season (with 1 year warranty remaining) and bought new. On those engines I never even looked at the pumps and never had a pump go in any of them. Lots of hours to. The 9.9 I have now has 3 seasons on it. I will change the impeller this spring.

 

[Fish-Hunter]

FH, I should have elaborated a bit more. This is what I do every year on the 200 HP Yami. I do have the 9.9 HO but this is the first on I've ever kept more than 2 years. (because they are not made anymore and I'm not sold on the bored out 8hp) Up until now I've always sold them after the 2nd season (with 1 year warranty remaining) and bought new. On those engines I never even looked at the pumps and never had a pump go in any of them. Lots of hours to. The 9.9 I have now has 3 seasons on it. I will change the impeller this spring.

Thanks, might try to get two years out of the impeller this time around. Just have to keep an eye on the telltale to make sure that it is working right.
Haven't heard anyone that likes the bored out 8.0 after using the older 9.9 HO. Bet you wish now you had kept a couple of the older ones around, would be worth a few bucks today. I know I will baby the one I have and keep it going for as long as possible and hope that they go back to the old style before I have to replace it.

It would be interesting to see the impeller when it comes out after three years on it, just to see what shape it is in.

 

[profisher]

I'll let you know. I find the T-stats are more prone to grief than the water pumps. I've had a couple t-stats seize partially open over the years. Fuel pumps are also another weak part. (even with one of the coolers I designed bolted on the pump)

 

[Fishing Guide]

Cheers All,

My mechanic is a Yamaha trained factory mechanic and he ensures I change my impellers every 2 years on both my 150 and my 8 HT Yamaha. As he says...cheap insurance. I can do those jobs myself and, when done regularly, the bolts and fasteners seem to come apart just fine.

 

[AlK]

Just did the pump on my T8. Very simple and straight forward.

 

[Island Fish Lifter]

FA- if you need a hand or what ever, Ill be here all weekend. I have everything you'll need to do your job. Let me know asap so I dont book up.

 

[Island Fish Lifter]

Thanks, might try to get two years out of the impeller this time around. Just have to keep an eye on the telltale to make sure that it is working right.
Haven't heard anyone that likes the bored out 8.0 after using the older 9.9 HO. Bet you wish now you had kept a couple of the older ones around, would be worth a few bucks today. I know I will baby the one I have and keep it going for as long as possible and hope that they go back to the old style before I have to replace it.

It would be interesting to see the impeller when it comes out after three years on it, just to see what shape it is in.

Three years doesnt mean ****. What you need to know is how many hours are on it.

 

[Fish Assassin]

Thanks IFL, I called you to see if you were home I almost have it done just have to see about one metric fine threaded bolt on the leg. It may just have to be ordered from Yamaha.

This has been a pain in my arse.

 

[Island Fish Lifter]

I might have one, pretty sure I do, Is it 8 or 10 mm, and how long?

 

[Fish-Hunter]

Three years doesnt mean ****. What you need to know is how many hours are on it.

How many hours would you say these things should be good for? We are putting on anywhere from 120 to 180 hours per year.

The one we took out when we got the boat had absolutely no spring left in the impeller fins whatsoever, they were very hard and permanently bent to the shape of the cup that the impeller sits in. The rubber was also cracked. Now that thing could have been orriginal (most likely was). We were told to replace every year, but if it is realistic to get more than that, then why waste an impeller that has another year of use in it. I know from reading some of your posts from the past, it appears that you have a wee bit of experience with the motors etc,,, any of your experience and thoughts welcome.
Thanks in advance.
Jay.

 

[profisher]

My 9.9 gets used over 1000hrs a year and this one has 3 full years on it.

 

[dance a jig]

Check out http://www.youtube.com/watch?v=n68sb7w-3Hw&feature=related y Jamestone Distributors. I believe there are slight variations on Motor year and model, but this should be a good start. DAJ