John A Cole Posted August 20, 2009 Share Posted August 20, 2009 I have a Mills 075 Indian with a crack on the front cranckase, behind the prop driver. Hasnt effected the brass bearing or the running, but the crack looks unsightly. Whats the best way to deal with the crack and also to avoid any further damage? Could I file the cranckcase down over the crack and rebuild with metal filler, reshape, and paint with exhaust manifold paint or smoothrite etc? Thoughts?....... Quote Link to comment Share on other sites More sharing options...
Doug Ireland Posted August 20, 2009 Share Posted August 20, 2009 Hi John, Try Dev-con (I'm not sure of the spelling) as long as the crack is clean it should work a treat. Quote Link to comment Share on other sites More sharing options...
John A Cole Posted August 21, 2009 Author Share Posted August 21, 2009 Thats what I was thinking, one of the metal based epoxy fillers. Its just a crack so intended to open it up with a needle file, over fill and file back to profile. Quote Link to comment Share on other sites More sharing options...
Doug Ireland Posted August 21, 2009 Share Posted August 21, 2009 Can't see a problem with that John, Dev-con is amazing stuff and can be machined, drilled and tapped when it sets hard. Quote Link to comment Share on other sites More sharing options...
Klippy Posted August 21, 2009 Share Posted August 21, 2009 Your biggest is going to be getting the oil out of the crack. If there's a boat builder close by they might have an expert aluminium welder. They'll often do the repair out of interest, or a 6 pack. I've seen them weld .5mm sheet together! Amazing! Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted August 29, 2009 Share Posted August 29, 2009 Hi . Have thought about replacing the c/case ? I know this ounds obvious but I bet there arehundreds of Indian mils out there with broken bits and good c/cases . If you cant get one that way have you thought about using Technoweld ? It melts at a much lower temp than the ali and brass bearing and you only need a small blow lamp. Basic set costs around a tenner ( or it used to) . Hope you get it sorted. Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted August 29, 2009 Share Posted August 29, 2009 When working on an oil rig a few years back a merchant seaman told me they used Devcon for filling cracks in cylinder liners on BIG diesels .It wasn't available to the general public then (only used by the navys ,but if it's the same stuff ,I reckon it will be OK .But is it ? Quote Link to comment Share on other sites More sharing options...
Allan Jordan Posted September 1, 2009 Share Posted September 1, 2009 Hi John, You can carry out a repair with " DEVCON" I have used it in the past and it's OK. You could even mix a small quantity of alloy filings into it as well. Is this any help ? Quote Link to comment Share on other sites More sharing options...
Terry Whiting Posted September 5, 2009 Share Posted September 5, 2009 Hi John, There is a product called "JB Weld" an American two mix apoxy. It comes in two different packs, 5 minute and 24 hour. Once cured It can be machined, just as stated on the package. It was produce for exactly that type of repair. For your repair use the 24 hour. Quote Link to comment Share on other sites More sharing options...
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