replacing the water pump gear. i read this these two threads. i sent one email to they guy referenced in the thread but its been nearly three years since the thread.
Hi,these gears are made out of plastic for a good reason,if the water pump suffers any catastrophic failure,or there is a problem elsewhere internally...the plastic gear is designed to be the first thing that gets destroyed,there by saving damage to the other components made from steel! So if you have one made from another material..& there is a problem..the damage to other moving parts could be rather significant !
By the way if your tachometer stops working,STOP immediately, & find out why!as the tachometer shares the same gear set up as the water pump!!
Regards,
GT750Battleship.
thanks for the info. from what i had read they were made out of plastic for noise control. good to know. i will get ahold of one for sure. this forum is freaking awesome. helpful and real info not just a bunch of guys stroking their egos.
aslsmm wrote:thanks for the info. from what i had read they were made out of plastic for noise control. good to know. i will get ahold of one for sure. this forum is freaking awesome. helpful and real info not just a bunch of guys stroking their egos.
You might like to have a look at the "Kettle Clinic" forum,great info & friendly bunch of guys from all over the World!
Cheers,
GT750Battleship.
I have the full gear repair instructions on a PDF file. Anyone interested will have to PM me their email address. After the repair, the gear is better than new and can no longer crack.
I was born with nothing and still have most of it left.
I got hold of some spring clips that fit the gears collar perfectly and give a counter acting tension to reduce the splitting issue. Naturally it helps putting them on when the gear is new.
Why would you do a patch job on something this important unless you have no other choice ? The gears really are not that expensive, and they are not hard to get if you want one. Suzuki still makes them - if they didn't still make them, it would be a different story.
Ian
If at first you don't succeed, just get a bigger hammer !
I agree Ian, simply buy a new gear and fit the spring clip to address the splitting issue and thats it. UNLESS you have no choice and its a temporary repair its worth fitting new gears once you have the cover off and see the splits. You will be buying extra gaskets for the cover anyways so its not sensible to bypass buying the gear.
Suzsmokeyallan wrote:...simply buy a new gear and fit the spring clip to address the splitting issue and thats it.
Actually I doubt this is true as I don't thinks its a stress or fatigue crack, but rather due to thermal cycling and expansion/contraction of the metal boss inside the nylon gear. Once the crack propagates to the outside edge its is game over regardless of whether you have a spring clip on it or not.
That's just my opinion, and it can join the other opinions already expressed - as yet we have no definitive proof whether a clip would make any real difference or not, but of course I for one don't plan to still be checking it in 40 years time to see who is right !
Ian
If at first you don't succeed, just get a bigger hammer !
The metal boss is an interference fit on the gear that as you said the heat and cooling cycles cause the gear to split from the stress being applied to the inner walls of the hole from the metal boss.
The clip I fit is of a very high tension thats trying to compress the gear boss from the outside to counteract the pressure from the metal boss.
So even if it splits the gear, the cracks cant open up to the extent of a gear with no clip fitted. I will be interesting to see how a gear holds up after ten years with a clip fitted to it.
Suzsmokeyallan wrote:The clip I fit is of a very high tension thats trying to compress the gear boss from the outside to counteract the pressure from the metal boss. So even if it splits the gear, the cracks cant open up to the extent of a gear with no clip fitted.
Well - clutch and valve springs both weaken over time due to heat and use - given its a metal clip and metal boss you'd expect similar rates of thermal expansion, indicating movement and eventual cracking can be expected - but time will tell the tale eh ? Enough on this - on to other things !
Ian
If at first you don't succeed, just get a bigger hammer !
i jjust ordered the new gear and installed it. already used my gasket too. on the next gt750 i get i will try a clamp thingy your talking about, then 10 yrs from now i will post here again on this very thread and the loser will have to buy the winner a beer. deal?
Again I have the complete fool proof forever fix for the gear. It's on a PDF posted by Lane Pipkin. I can't seem to post it here, but if you PM me your email address, I would gladly forward it to you.
I don't have a web site. Anyone know how I can post up a link to the file on my home computer?
I was born with nothing and still have most of it left.
Hi,these gears are made out of plastic for a good reason,if the water pump suffers any catastrophic failure,or there is a problem elsewhere internally...the plastic gear is designed to be the first thing that gets destroyed,there by saving damage to the other components made from steel! So if you have one made from another material..& there is a problem..the damage to other moving parts could be rather significant !
The gears really are not that expensive, and they are not hard to get if you want one. Suzuki still makes them - if they didn't still make them, it would be a different story. 
then 10 yrs from now i will post here again on this very thread and the loser will have to buy the winner a beer. deal?