787 case halves

[Black67tb]

Need some advice please. After putting this engine together, l have pressure checked rotory valve chamber, and the cooling system. There were no leaks. Then i pressure checked the upper and lower engine chambers together. There is a small leak from the rotory valve cover. I removed the cover. The case halves have a small step that l feel with my finger nail where they join together. Has anyone seen this before? There is no leak between the case halves. Can i just put some Threebond on the rotory valve cover oring? Or is there something seriously wrong?

 

[Black67tb]

Need some advice please. After putting this engine together, l have pressure checked rotory valve chamber, and the cooling system. There were no leaks. Then i pressure checked the upper and lower engine chambers together. There is a small leak from the rotory valve cover. I removed the cover. The case halves have a small step that l feel with my finger nail where they join together. Has anyone seen this before? There is no leak between the case halves. Can i just put some Threebond on the rotory valve cover oring?View attachment 58157View attachment 58156

 

[etemplet]

Same thing happened to me once. On assembly you gotta bump the cases around a tad, get the ends and rotary valve area evened up. I'd use Gasket Eliminator (the red stuff) on that surface but 3 bond will work. Good Luck !!

 

[Black67tb]

so do l have to take the cases apart and start all over ? And can l live with that step?

 

[etemplet]

I depends on how big a step you are talking about? Do the rotary valve clearance test and check the clearance top and bottom. This will tell you the offset. I'd says less than .005" is OK. I never checked mine, I just put it together and rode it. LOL I wasn't taking anything back apart.

People might not agree but if you are gonna leave the step, I take some of the edge off with emery paper and smooth it a bit. Good Luck !!

 

[Poormanracing]

No step in cases that will chew up the rotary valve.un fortunately you have to start over