Cylinder mating surface gouges! Is this concerning?!?

[makaveli07]

Hey everyone i got my cylinders back from having them bored one size over i noticed one new gouge on the mating surfaces (probably due to shipping). Is this gouge concerning ? I also noticed a couple minor gouges as well.

I was thinking to just file the new big gouge on the edge near the bolt and put some loctite 518 under the gasket anyway as i reassemble.

Im doing this rebuild and im super ocd and made sure every single thing is replaced with either oem or oem+ parts if oem wasn’t available!

How concerning is this?

Any help is much appreciated!!

Thank you!!

 

[DanSquires]

I wouldn't concern myself with those

 

[mikidymac]

As Dan said. nothing to worry about and very common.

Make sure you check squish per the manual to choose the correct gasket and pressure test the engine when you are done.

BTW: 518 is not to be used on gaskets, it is a flange sealant for hard surface to hard surface.

 

[etemplet]

Don't file anything uless there is a raised surface and do that lightly. Using a stone is the best way. None of those marks are bothersome. The low area has to be 80% or more way across the surface. I don't use anything on head, cylinder, or exhaust gaskets. Good Luck.

 

[makaveli07]

As Dan said. nothing to worry about and very common.

Make sure you check squish per the manual to choose the correct gasket and pressure test the engine when you are done.

BTW: 518 is not to be used on gaskets, it is a flange sealant for hard surface to hard surface.

Thank you! Out of curiosity would you happen to know where i can get block off plates to pressure test this 787 engine ? I know Racer doesn't make them anymore unfortunately; so i have been kind of stuck. I noticed someone on the forum mention that they used Dorman 02606 1 7/8 inch for the exhaust manifold and 02603 1 1/2 inch x 2 for the intake manifold to pressure test the 657x engine but i dont know if those would work on a 787. Would you know by any chance?

 

[makaveli07]

Don't file anything uless there is a raised surface and do that lightly. Using a stone is the best way. None of those marks are bothersome. The low area has to be 80% or more way across the surface. I don't use anything on head, cylinder, or exhaust gaskets. Good Luck.

Yeah only the one by the bolt has a slight raised surface I'm going to lightly file it down and making sure not to touch any of the surrounding edges!

 

[etemplet]

It is difficult to flie those surfaces and keep them flat. Gaskets can handle those imperfections quite easily. I've had some errosion around the cylinder base sealing areas and have used JB weld to repair those. I like to have good contact area. I use the good JB Weld tuff not the quick set. You should be fine. Use assembly lube when putting the engine together and pack the wrist pin bearings with grease before install.

 

[mikidymac]

I am not sure of anyone that makes blockoff plates anymore. You can get some neoprene rubber and just make your own clamping them with the headpipe and carbs.

 

[makaveli07]

I am not sure of anyone that makes blockoff plates anymore. You can get some neoprene rubber and just make your own clamping them with the headpipe and carbs.

Thats a great idea!!! Thats what i will do thanks!!!