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Old 08-21-2017, 04:26 PM
fr3d fr3d is offline
TT Newbie
Join Date: Aug 2015
Boat: mastercraft x46 2014 6.2l
Location: europe
Posts: 9
Mastercraft X46 rear ballast crack


my starboard rear ballast developed a leak
the leak is coming from the original welding at the top rear side of the hard tank.
It is frustrating because you can see it but still very difficult to access for welding. I manage to do a first repair but unfortunately, it still leaks (I used a dremel small gas torch with a modified tip and after checking the temperature was about right or about 300 deg Celsuis)

since then I ordered an electric welding iron made for plastic welding, so i will try again to weld

1/did anyone experience the same issue? how was it sorted?

2/can I remove the hard ballast tank from a X46 without separating the hull

3/what about cutting the tank to pieces and replacing it with a soft bag?

thank you for your help


Last edited by fr3d; 08-21-2017 at 05:43 PM.
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Old 08-21-2017, 05:53 PM
Blakey13 Blakey13 is offline
TT Regular
Join Date: Jul 2014
Boat: 2014 x46 7.4
Location: Canada
Posts: 94
My X46 Tanks Did The Same Thing Are Covered Under Warranty For The Time Being I Used 3m 5200 Fast Cure For The Rest Of Summer Dealer Will Replace Early Spring Must Split Hull
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Old 08-21-2017, 07:25 PM
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lashburn1 lashburn1 is offline
MC Addict
Join Date: Aug 2013
Boat: 2015 X20 SS
Location: Oceanside California
Posts: 5,088
Its a RAZOR cut most likely. from carpet fitting at factory

2015 X20 SS GEN2 6.0
2016 G21 Coastal
2014 X46 GEN2 7.4
2014 X30 GEN2 5.7
2006 VRS200 SS 5.7
2013 X30 GEN2 6.2
2013 Yamaha 242LS
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Old 08-21-2017, 09:03 PM
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moosehead moosehead is offline
MC Maniac
Join Date: May 2015
Boat: '15 X10 6.0L, '15 X30 6.2L
Location: Mountain West
Posts: 2,748
Buddy with '14 X46 had his replaced under warranty, had to split hull like Blakey above. Norcal MC did his, but others may be sent to MC HQ if stateside. Not sure of your options in Europe?
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Old 08-22-2017, 08:18 AM
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MattsCraft MattsCraft is online now
MC Devotee
Join Date: May 2008
Boat: 2013 X25 - 6.2 Ilmor Baby
Location: Cincinnati, OH
Posts: 1,808
You can try to plastic weld it, however this is really hard with the tank in the boat. The tank is HDPE, so make sure you get the correct welding rods. I purchased a welder from harbor freight & the HDPE rods from Grainger.

I was not 100% successful with the weld as I still had pin whole leaks. Also, I never found anything to really bond well to HDPE, 3M 5200, Flex Seal, etc, it all sticks initially, covered the pin holes, but just peals right off if you rub it. I was not happy with the fix for the long run & was able to get the starboard side tank out via the coffin & replaced it.
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ballast, cracked, leak, x46

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