rickter xfs pump bolt threads

[shank]

my 2014 rickter xfs has four holes obviously for the pump to be bolted into the hull. the two to the front of the ski (pump shoe end) will not lock tight they spin.

they are 10mm threaded bolts. The thread inside the hull appears to be metal inserts. i can see the thread visually worn looking in the thread holes on the two in question. The other two are fine.

I have heli coils for 10mm. But i have to drill to 10.5mm and tap to get a heli coil in there for a 10mm thread. i cannot get the heli coil to fit in without drilling as i tried to screw it into the 10mm thread but it didnt work. This sometimes works with heli coils that are smaller like 5-6mm it worked for me in the past.

Now i am worried if i drill to heli coil. i will drill out the metal 10mm thread inserts that are in the hull already and make a mess of the hole.

I have 8mm heli coils but they to small for the 10mm hole. So i cant drop it to 8mm thread as is.

So my question is. Can i drill for heli coil with 10.5mm drill bit and thread it to insert 10mm heli coils ?

OR if i cant i cant is there a better way to fix ?

i can only think of possible filling the hole with JB weld then drilling and tapping it for 8mm bolts that will be smaller then the 10mm metal insert.

???????????????????????????

 

[Harbor]

I had a 6x1.0 ride plate bolt anchors thread pull so I tapped to 1/4 20 SAE

You might think about this option, drill & tap fir a 7/16 SAE bolt, it’s .437 and the 10mm is .393

I think your inserts are blind holes so you’d need a blind hole tap or thru drill the insert a little

 

[te4250]

Yeah either 7/16 like harbor said or helicoil to 3/8, tap drill is 10mm for a 3/8 helicoil tap so ur just barely cleaning the major diameter then rethreading

 

[shank]

Update. I drilled and tapped for a heli coil in the holes which are now fixed. There was enough metal to upsize the drill to fit the helli. It did split around the metal thread of the hull a bit at the top of the thread inserver which could potentially cause some water leak into the hull. So i put a bunch of sikaflex in when bolting in the pump this should seal it up while the pump is in there. It just means if i remove the pump for any reason i gotta clean and sika again. Thought about using epoxy but i thought sika the easier option.

My drive shaft is the most centred I have been able to get it now, most likely because i can torque the front bolts of the pump.