New Midshaft, shimming pump - SOLVED

A

Almost_nick

Location
Clovis, NM
Hey guys,

So I installed my new Midshaft housing with new bearings and seals all packed well with marine grease. Put the engine back in, lined it up and got the ski back together. Started the ski (on the trailer connected to the hose), no major vibrations and engine runs good, but when I went to feel the Midshaft after running it for 5ish min the center portion of the Midshaft and the actual short shaft were hot to the touch. Not sure if this is supposed to happen, or its warming up because the ski is not in the water, can anyone shed some of their ski wisdom on me?

If its not supposed to get hot maybe the engine is not lined up properly, could that cause this?

Thanks

Nick
 
A

Almost_nick

Location
Clovis, NM
Quinc said:
Did you line up the pump/drive shaft?
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Quinc,

Hopefully im tracking your question correctly. I never took the driveshaft out, I just replaced the Midshaft housing, I didn't think I needed to lineup the driveshaft if I am just replacing the Midshaft... Am I wrong on this?

Nick
 
A

Almost_nick

Location
Clovis, NM
Thanks for the responses guys.

jetskidude1113 said:
New seals friction to the shaft creates heat. does get pretty warm.
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Jet Ski Dude, I hope this is the case, I was thinking maybe its because its a all new Midshaft and it just needs to wear in a little.

Proformance1 said:
Did you re-shim motor so that its aligned and the coupler is not doing the hearing up? How long did you run on hose?
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Proformance1, I reshimmed the engine as straight as I could. I ran the ski for 5ish min, I did rev it a few times to make sure it was all secure after install.


Nick
 
Proformance1

Proformance1

Liquid Insanity
Location
New York Crew
Agreed, and besides the 5 min if you used commodity midshaft and seals and not one they fit funky and will definitely heat up.. Water test and recheck before discussing more.
 
Yami-Rider

Yami-Rider

TigerCraft FV-PRO
Location
Texoma
Misaligned or bent driveshaft will cause the midshaft to overheat.

.035" runout caused mine to run to hot to touch after riding in the lake for a few min. A new unbent driveshaft fixed that issue.
 
Last edited:
A

Almost_nick

Location
Clovis, NM
Hey Guys,

Thanks for all your responses, I think I have it figured out now. Being the first time replacing my mid shaft housing and hearing your feedback, there is one thing I did not do. When replacing my mid shaft, I did not think about how the driveshaft lined up with the hole in the firewall/hull. Remembering back, I can clearly remember the driveshaft not being centered with the hole, it was definitely low, almost touching the firewall, being my first time I didn't think anything of it. After doing some research based on your feedback I definitely need to shim my pump so that driveshaft is centered. I am willing to bet this is the culprit. The driveshaft is probably putting pressure on the mid shaft and housing by not being aligned.

I will pull the mid shaft and align the pump and will report back. I will also check to make sure the driveshaft is not bent.

Thanks for the help everyone!

Nick
 
Big Kahuna

Big Kahuna

Administrator
Location
Tuscaloosa, AL
do you have to pull up on the housing to get the bolts to line up? The shaft being in the center is not as important as the Driveshaft, Midshaft and Motor all being aligned correctly.
 
A

Almost_nick

Location
Clovis, NM
Big Kahuna said:
do you have to pull up on the housing to get the bolts to line up? The shaft being in the center is not as important as the Driveshaft, Midshaft and Motor all being aligned correctly.
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Yep, I definitely remember having to pull up on the mid shaft to get the bolts to line up. Also, I just took a look at my pump and there are zero shims on the bolts, I am the second owner of the ski so.. not sure if the first owner didn't know what he was doing but it seems unlikely that zero shims are required on the pump. I can also see that the pump was removed at one time do to the silicone job on the bottom.

If anyone has any tips/tricks that they want to share, I am open for all suggestions.
 
A

Almost_nick

Location
Clovis, NM
Hey guys, finally got the time to rework the ski using your inputs.

I got the Cold Fusion alignment tool and pump shims. I installed the alignment tool, and saw that the driveshaft needed to come up because it was sitting low. I loosened the 4 bolts on the pump, and started to install the shims only on the rear 2 bolts, constantly rechecking the alignment after snugging up all 4 bolts.

Here is the problem. I have now gotten all the shims installed, none left (4 mm per side) and have seen almost zero progress on the shaft moving towards center. Its starting to get ridiculous with the shims, and seems like it shouldn't need this many. At this point it looks like im going to need at least 6mm of shims installed on each of the rear 2 bolts. Am I doing something wrong here?

Also, the driveshaft doesn't seem bent, took a careful look spinning it and using a plumb almost touching the shaft, zero wobble was seen, the gap between the tip of the plumb and the shaft remained constant throughout the rotation.

Need your recommendations!

-Nick
 
Sanoman

Sanoman

AbouttoKrash
Location
NE Tenn
Have you tried leaving the front two bolts snug (not tight) and then tried shimming it? You can buy more shims from JM,but can use some washers (of different thicknesses) to at least get an idea of how much more it will take to align.
 
A

Almost_nick

Location
Clovis, NM
Sanoman said:
Have you tried leaving the front two bolts snug (not tight) and then tried shimming it? You can buy more shims from JM,but can use some washers (of different thicknesses) to at least get an idea of how much more it will take to align.
Click to expand...

Ill give it a shot, when I first tried that I could hardly place any shims since I had to put a lot of pressure downward on the back up the pump to give enough space to place a shim, felt like it was almost bad for the pump or the mounting points for the pump. I'll give it another shot today, will report back.
 
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