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GTX 155 4-Tec cavitation

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JoanEnric

JoanEnric

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Hi all!!

After testing and testing, it seems my GTX has cavitation. The fact is that last summer I had new impeller (ref: 267000675) and new wear ring (don't have ref number).

I'm stuck in 46-47 at 7300 more or less and 0-30 takes long to achieve. I have to check also fuel filter, but after searching, it seems that I have more clearance between impeller and the wear ring than it should be. How is that possible?

Is it possible that the dealer put a wrong wear ring? Impeller and ring have only 35 hours, both are in perfect conditions.

I'll appreciate any comment.

Thanks a lot.
Regards.

View attachment 39829
 
Last edited by a moderator:
Most dealers use OEM parts. So the odds of the ring being wrong are not likely. Possible, but not likely.

Check the gap to confirm it is smaller than the width of a dime. If, I'd put the original impeller in to retest the gap. This will tell you if it is a wear ring issue or impeller issue.

You may have a Carbon Seal leaking as well.
 
Hi Coastiejoe!

Thanks for your reply. The carbon seal is the original one, never changed. This summer I'm going to put a new one.

By the way, if I compare with others, in my case I can see a lot of light if I look through it, and the gap is homogeneous in all the circumference of the ring. The new impeller seems to be the correct one by the reference number.

Regards!
 
Anytime you change multiple parts and there is an issue, it can get challenging. That is why I will normally go back to a known item, such as the original impeller.

If I simply had to guess, I'd blame it on the ring. But it really is impossible to guess with accuracy.
 
Wear rings are pretty easy to change so if it is out of spec, I'd swap that for an aftermarket one (cheap alternative.) When removing the pump you can also look for seal issues. The previous owner of mine had the o-ring with the metal center drop down under the main seal when the pump was last installed. And of course the carbon seal is an easy item to look at while the while the pump is getting attention.
 
Coastiejoe said:
Anytime you change multiple parts and there is an issue, it can get challenging. That is why I will normally go back to a known item, such as the original impeller.

If I simply had to guess, I'd blame it on the ring. But it really is impossible to guess with accuracy.
Click to expand...

That was the original impeller, previous owner. I had to change it, max speed was 36... And the ring was also very bad. I think there's nothing to do with it :lol:

Next month I have to go to the dealer, the same that changed all the stuff last summer.

Regards

20160914_123311.jpg
 
bell99man said:
Wear rings are pretty easy to change so if it is out of spec, I'd swap that for an aftermarket one (cheap alternative.) When removing the pump you can also look for seal issues. The previous owner of mine had the o-ring with the metal center drop down under the main seal when the pump was last installed. And of course the carbon seal is an easy item to look at while the while the pump is getting attention.
Click to expand...

Hi!

Well, the carbon seal doesn't look too bad, but I'm going to change it. I'm thinking also to ask for a new ring, to compare with mine in order to see any difference.

Regards!
 
When you remove the carbon seal be sure to inspect it for any unusual wear that might indicate an engine alignment issue as well. Be sure to also replace the rubber bellows when you change your carbon ring as they loose tension with age and can definitely cause cavitation. You may also want to look into a new stainless steel ring if the wear surface does not look good.
 
Yep! Be sure I'll do it.

In 15 days I'll go on holidays and my dealer is waiting me. So I hope next month I'll have everything fixed out!

Regards!
 
devonte007 said:
When you remove the carbon seal be sure to inspect it for any unusual wear that might indicate an engine alignment issue as well. Be sure to also replace the rubber bellows when you change your carbon ring as they loose tension with age and can definitely cause cavitation. You may also want to look into a new stainless steel ring if the wear surface does not look good.
Click to expand...

Hi! Thanks for your reply. I'll check everything :)

Regards!
 
Hi all!!

Just returned form my holidays. Good news and bad news.

The good ones. After changing fuel filter and the angled bearing, my top speed is about 50. The fuel filter was really dirty, and the angled bearing was almost destroyed.

The bad ones. Well, the gap between the impeller and the wear ring was about 0.8
The dealer did a great job, and changed the impeller by a new one, everything in warranty, in order to check if there was a problem with the impeller.

But, with the new impeller, the gap is the same, 0.8

So, the problem is the impeller housing. They told me that this is a plastic part. And that is causing my cavitation problems.

The dealer has done a great job, searching for the problem. Now I have to decide if I change the impeller housing. At least, we found the problem.

Regards!
 
What year is your GTX and please share what part number is on that new pump? Glad they got it fixed.
 
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