Print Page - Stock R5 case crack advise sought

Title: Stock R5 case crack advise sought
Post by: Greaser Greg on February 04, 2020, 10:00:39 PM

Is this thing garbage? Run, repair, or replace?

Title: Re: Stock R5 case crack advise sought
Post by: rodneya on February 04, 2020, 10:39:51 PM

Looks like a casting flaw

Title: Re: Stock R5 case crack advise sought
Post by: Barrie on February 05, 2020, 12:26:29 AM

Yep , I agree with that also.

Title: Re: Stock R5 case crack advise sought
Post by: Striker1423 on February 05, 2020, 07:13:21 AM

The only way you'll know for sure is to pressure test the motor and spray it down to see if it leaks there. Cracks in engine cases happen and any good local welder can take care of it if it indeed is a crack. But it could just be a casting flaw too.

Title: Re: Stock R5 case crack advise sought
Post by: Greaser Greg on February 05, 2020, 09:51:28 AM

Great info,thanks all! There is nothing similar visible on the other side, so I don't think it will leak. Was more worried about a catastrophic failure.
So when the case cools the material shrinks more in that area to create a void? Or impurities in the casting material fall out eventually, leaving the space? Inquiring minds....

Title: Re: Stock R5 case crack advise sought
Post by: Plasticman on February 05, 2020, 10:07:25 AM

All my RD400 cases have "cracks" like that in various places.

Rob

Title: Re: Stock R5 case crack advise sought
Post by: Greaser Greg on February 05, 2020, 09:30:53 PM

:metal: :righteous:

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The 2-Stroke Garage => Turning Wrenches => Topic started by: Greaser Greg on February 04, 2020, 10:00:39 PM