Fitting new impellor to Suzy DF140

[suzygs1000]

HI,

I have decided to do my own servicing, as my motor has just past the three year old mark, and anyway, Haines have not been too good at looking after my motor with warranty anyway.

It is a piece of cake to do an oil change with filters, and changethe low pressure fuel filter and gearbox oil.

Decided to replace the impellor, as the motor has about 150 hours on it.

The old impellor still looked brand new, but I replaced it anyway.

Trouble is, I put the new one in the wrong way round!!!!!

I started the motor, it made a few funny sounds, then settled down to idle, but was not pumping water unless I revved the engine.

I shut it down, then that night realised what I had done.

I pulled the leg off next morning, but couldn't see what way around the impellor was , as the housing came off and left the impellor on the shaft, with the arms straight out again.

I reinserted it the right way around, but it would not pump enough for the telltale at an idle.

I pulled it to bits again, and everything looked ok.

Put it back together again, but still not sufficiuent pressure for the telltale to work at idle. If I ran the motor at 2000 revs, it came out of the telltale ok, but stopped when I dropped it back to idle. Also, at 2000 rpm, it was not as strong a telltale as it used to be.

I did this whole operation twice more with the same result.

I ended up replacing the old impellor, when everything went back to normal.

Good strong jet from the telltale at idle.

The new impellor still appeared to be as new when I removed and replaced it three times.

Any clues as to what is going on?

Could I have buggered it from putting it in the wrong way round?

No comments about idiots or doing your own servicing, thankyou.

Dave.

[Blackened]

G'day

Are you sure you got the right impeller for your engine? Part numbers match up ok?

Dave

[frank100]

Mate,
I have replaced several impellers onmine. Like you I could'nt see much difference between the new & the 'old'.
The last time I changed one was'nt due to periodic servicing though.
Without boring you with the details (embarassing !) , the motor was run out of water for no more than 45 secs. After putting it back down & restarting the telltale was pretty poor. I did about 50K back to the ramp with no probs. back at home flushed (both with hose connection & in tank) no improvement. Replaced the impeller & had a good look at the old one, I could not relly tell there was any visual damage. I'm thinking the 'blades' had lost their"spring" affecting the pumping ability of the impeller.
Anyway another servicing issue can be the oil cooler, I have replaced mine a year ago or so. Next service I will see if it is corrodeing like the last one. Since the I have flushed for at least 10mins at the ramp & about every second trip I reverse flus (hose fitting), every flush ends wit a flush using MACS. I am told it works, I will believe when I see.
Frank

[suzygs1000]

Yes, Dave,

It was the correct genuine part.

Dave.

[cormorant]

Basic stuff first. Have you got a full parts diagram and check you had all teh required parts and second they were put in the correct order. Have you got the factory books for your motor - theyinclude pictures of correct place and type of any sealants etc required if any. Have had keys not engagae teh keyway as well and teh small piddle you are getting on teh muffs may be just that - tap pressure

Most pressure issues I have had ( different motors) are from the seal between the water pump and the tube to the motor. Hard to pick as there is no way of seeing it but if all else is Ok that is what i would check has alighned properly


Frank - really interested to see if the MACS makes any difference.

[1lastcast]

Dave im not sure if they even have a up or down side the only ones i have ever replaced on 40 hp engines looked the same on both sides does it look like it has a up side to it ? .
It might be an idea to take it back and try to exchange it for another then see if you still have the same pressure then .
If that does not work then take it to a suzuki dealer , hopefully you have a dealer up there that doesn`t bend you over the counter like the one here in brisbane does !
Good luck regards MONOSTRETCHO

[1lastcast]

double post !!!!!!!!!

[PADDLES]

was the motor warm? are you using muffs or a drum to run it at home? my 140 when i had it used to be similar when cold and run on muffs, once it was in the water it pumped fine. i put it down to a combo of krap water pressure and a closed thermostat when cold. once it warmed up it seemed to pump fine.

[frank100]

Suzygs1000,
I fogot to mention that you need to smear the drive shaft with grease B4 reattaching the leg.The shaft goes thru a bush(1/2 way up the leg I think) if you do'nt grease it it will squeak after a trip or 2. I think also from memory if you put the impeller upside down you wo'nt get the key in the keyway properly (if at all !)

Cormorant,
Have a friend who replaced the oil cooler at the same time as I did. Cyclones permitting (Cairns) he will be stripping his this w/end. Hopefully he will let me know if the MACS has had an effect (he did the same as me started using MACS after the oil cooler replacement) Will let you know.

[dreemon]

You said it made a few funny noises on the first startup then it went away,

it might have been a rubber bush ( or even silicone ) that runs along a divider of the pump and exaust and separates the two, On mine (yam 902st) I wasn't getting any water out of the " nostrels ?" at the rear, but it pumped water fair through the pisser,

I ran a bead of sika to seal the sections off and let it dry overnight, when I restarted it it had a little more pressure out the pisser and the nostrels were spitting really good, worth a try , and good luck

also if it did chew up the rubber or silicone it posibly could have blocked the water tube ? maybe not. . . . .

[cormorant]

is the pee hole and tube behind it clear? Can teh motor be fitted with a water pressure sensor for future reference and notice of possible wear or failure?

[suzygs1000]

Further update re the impellor.

These can't be put on upside down on the Suzy 140, as one end of the impellor has the key slot closed off. What I did was to put it in the housing with the blades bent the wrong way round.

I guess the noise was them being flipped back the right way.

I had it to bits three times, and made sure everything was spot on.

The impellor still looked brand new, and had not run for more than a couple of minutes, but nothing I did could get it to pump sufficient water at idle for the telltale to expel water.

I ended up refitting the old impellor, which had very little wear anyway, and was fitted exactly the same way as the new on, but the old one works perfectly.

Also, thanks Frank, I will be sure to keep an eye on the oil cooler.

??? who knows...thanks for the replies, Dave.

[frank100]

suzygs1000,
No worries, let me know if you need any info from the wksp manual. I am abit suprised that the new impeller did'nt perform, since if it was upside down with no key it would'nt spin & damage itself, although the engine may get a little too hot !
My mate still has not pulled the oil cooler so no news on that front.

Frank

[suzygs1000]

HI,
FRANK,

No, it wasn't upside down, and I did have the key in it, I just located it in the housing with the vanes bent the wrong way, so when it spun, they flipped back the right was, and didn't seem to damage the impellor.

thanks Dave

[frank100]

cormorant,
The mate finally pulled down the oil cooler. There are couple of small "salt" spots but otherwise very clean.The original lasted about 100Hrs & was badly pitted / corroded. This one which has been flushed with MACS after every trip has done 200 odd hrs.He did find a lump of wet salt in the cooler
I do'nt want too be an ad for these things BUT it seems to work. I will pull mine done in 3-4 months, meanwhile I will keep flushing with MACS even though I think it's bloody expensive.
Frank