Thread: Intermittent Thrust Issue
03-27-2013, 12:46 PM #1
- Join Date
- Sep 2011
Intermittent Thrust Issue
I have a Polaris Virage i, getting time to get it ready for the spring, and last season I only had time to get out a few times.
What was odd, was the engine was throttling up properly, but I was not getting the proper amount of thrust based on RPM. If I was under 3000RPM, I never noticed a problem.
The problem was above 3000, trying to get on plane.
If I revved the engine RPM's up and down a bunch of time in the water, eventually the pump thrust finally engaged, and then had no more issues for the rest of the day. But then the next day or week, the same issue occurred.
Since I trust all of your knowledge since helping me get passed my Check Engine light, I hoped that you had some ideas on where I could start my investigation to the issue.
03-27-2013, 01:56 PM #2
- Join Date
- Jul 2007
- near Toronto, Canada
Well, start with checking the driveline. Remove the jet pump and inspect the splines on both ends of the drive shaft, and inside the impeller and the engine coupler. Do NOT stick your finger inside the hole, metal splinters are painful. Splines should be square shouldered, not worn or rounded over.
Also check the rubber bonded drive coupler on the rear of the engine for any signs of the rubber bond failing.
While you have the jet pump removed check the impeller bearings for zero slop and no play, no gritty feeling or noise when turning. Also check the impeller blades for damage, stuck debris, etc. Same with the stator vanes.
My signature links include info showing how to remove the jet pump and inspect the impeller.
Keep track of the small rubber end bumpers that are located on each end of the drive shaft. Sometimes they stay in place on the drive shaft, sometimes they end up hiding down inside the impeller or drive coupler.
03-27-2013, 01:58 PM #3
Once I removed, re-installed, and resealed everything, never had the problem again......
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By leedanger in forum 2-Stroke PerformanceReplies: 2Last Post: 09-11-2012, 12:54 PM
By mi-skidoo in forum Sea Doo Open DiscussionReplies: 16Last Post: 08-29-2012, 05:44 PM
By SL1050 in forum Polaris How To & FAQsReplies: 2Last Post: 07-25-2009, 06:18 PM
By devil666 in forum Yamaha PWC Performance (2-stroke)Replies: 10Last Post: 02-18-2009, 09:00 AM
By RXPNJ in forum Sea Doo Open DiscussionReplies: 6Last Post: 06-24-2005, 10:38 AM