2007 Challenger ,High RPM little movement

[tlcn1]

Hi , I was out today in my 2007 Challenger 180 and everything was going great , Stopped for a second and then when I went to take off I hit the throttle and had plenty of RPM but the boat was barely moving .I limped it back to the dock and didn't notice anything in or around the intake. Normaaly it gets clogged by Hydrilla but not this time. I am concerned . Does anyone have any ideas?????

Tony

 

[kustomkarl]

Tony, did you give the Jet pump a real good look at it. I have seen people have a soda bottle stuck in it that couldn't be seen until it was on the trailer and you had to craw under it to see it. Look there first, and if you think it might be a wear ring here is the specs for it. It will look by the naked eye like bigger than 1/16" Clarence.

Wear Ring clearance for ALL 4-tec 0.035 mm or ( .014in)

Wear Ring clearance for your seadoo 1.0 mm or (.040in) Measure the clearance at the center of the impeller blades, with a 12” long guage. Measure the clearance from the venturi side of the jet pump.

I hope it is just somethin overlooked in the Jet Pump.
Keep us posted on what you find, and we'll help you get it going again.

Karl

 

[tlcn1]

Thanks Karl ,I will take a more indepth look at it tomorrow afternoon and keep you posted. Will I have to remove anything to see if thats the problem ??

Tony

 

[kustomkarl]

From under the seadoo Tony, you should be able to see up into the grate and from the rear use a flash light to get a good look into the nozzle. Look for any deep gouges and scrapes besides large clarence around the impeller blades too. The Jet Pump relies on pressure from the water getting thrusted out the nozzle to produce thrust...like blowing in to a garden hose by mouth or a straw...the straw has more thrust based on volume of air you blow through it to the size of the diameter of hose or tube. The pressure being blown through it doesn't change the diameter did.

Keep us posted.

Karl

 

[tlcn1]

Good news ,I found 2 nice size chunks of wood stuck in the impeller . I had to remove the protective grate on the intake to get to them. I removed them put the grate back on and took it out for a ride. I was able to do around 44 mph which is the norm with 4 people on board. It looks like the wood left a slight grove but with no ill effects on performance. Big sigh of relief!!!:hurray::hurray:

Thanks

Tony

 

[sjacob]

Same problem

I am having the same problem..this is second time. I found a chunk of driftwood before but this time nothing. I accelerate and the RPM goes high but the boat does not go past 13-14 mph. I don't see any damage to the impeller, could I have damaged the internal gear. I am a newbie as well and I am finding it very difficult to trouble shoot from owners manual..it is not detailed.

 

[timmyboy76]

might have damaged the wear ring...check for clearance between the outside edge of impellor blade and wear ring, 1mm gap or less....

 

[vilord]

sjacob, there aren't any gears that could be damaged, the pump is directly attached to the engine.

The only thing it can be if the engine is getting full throttle is either something is in the pump (wood, bottle, fish, etc) or the impeller isn't close enough to the wear ring anymore.

Basically what Karl was saying in his analogy is this:

Drinking straw = impeller, garden hose=jet pump.

If you put a drinking straw into a garden hose and blow on it, the air will come right back around the edges of the straw instead of going through the hose. You have to fill in the gaps around the straw (in the pump this is the wear ring).

 

[sjacob]

More info

Thanks all,
I took it into the shop this morning, they said it could be the wear rings or the pump, I will know more later. What should I expect to pay for this? I have a 5 year parts and labor warranty but it seems as though this is not going to be covered by it.