787 Resto Concerns upon disassembly (pictures) need HELP!!

[makaveli07]

Hey everyone,

Let me start off by saying this is my first time rebuilding an engine, and I'm a perfectionist. Upon disassembling this 787. I have a few concerns outlined below:

1. I noticed the flywheel weight is gouged in 2 spots as seen in the pics, should i be concerned ? do i need a new flywheel ?

2. To remove the PTO i read online to use a pipe wrench rather than the impeller tool to avoid stripping the splines... i removed the grease fitting and used a pipe wrench but it left gouges in the metal as seen in the pics.. should i be concerned ? do i need a new pto?

3. One of the cylinder has a gouge where the rave valve sits(as seen in pics) no idea what caused this but the engine was rebuilt prior to me disassembling it and the person who has done it .. did a terrible job. should i be concerned ? or just smooth it out new gasket and all fine?

4. The head has cracks in 2 places as seen in the pictures, do i need a new head or what should i do?

Any assistance is really appreciated !!

Thank you.

 

[mikidymac]

Flywheel should be fine, PTO is fine.
Head shell is cracked from freezing so you better double check the actual head and cylinders for cracks. The shell is fine as long as it doesn’t leak water.

The RAVE gouge can be filled with JB weld and sanded flush.

 

[makaveli07]

Flywheel should be fine, PTO is fine.
Head shell is cracked from freezing so you better double check the actual head and cylinders for cracks. The shell is fine as long as it doesn’t leak water.

The RAVE gouge can be filled with JB weld and sanded flush.

Thank you! For the head shell would welding that spot be an issue? Im thinking to take it to a welder to have it welded.

 

[mikidymac]

If it isn't' cracked through you can just use something like JB weld as it is not really structural.

 

[makaveli07]

So i got my crankcase in the mail (ordered from ebay, and its chipped which is concerning me, should i be concerned about this chip?

 

[mikidymac]

Should be fine but you should pull that rotary gear and rebuild it.

 

[makaveli07]

Should be fine but you should pull that rotary gear and rebuild it.

On it. Already had the oem rebuild kit for the rotary gear ordered from OSD.

 

[makaveli07]

Took my cylinders to get them Vapour blasted before i get them bored. They cam out amazing... although the guy who was vapour blasting them didn't blast them to bare metal he said the cylinders seem to be ceramic coated for heat dissipation. Are 787 cylinders ceramic coated from factory or did someone do this at some point? or is this just primer lol. I asked if I should paint over it he said he wouldn't recommend it since its there for heat dissipation.

 

[mikidymac]

They are not ceramic coated and especially not for heat dissipation since it’s water cooled.

Honestly that looks like the factory white paint and he didn’t blast off anything but dirt.

Factory finish is just zinc primer and white paint.

 

[makaveli07]

Its not the white paint for sure as they were painted black, so he definitely did blast off the black paint but it grayish so i assume its the primer. really sucks i paid good money for the blasting and i did not want to go sand blasting route as its more harsh. I don't see any rust or anything it does seem he blasted off all the condensation etc.. Should i take them to get sand blasted when they comes back from boring or should i just scuff them and paint ?

 

[fatblockabody]

If that's the primer why can't you just paint over that? The adhesion is great and looks like a good surface to paint.

 

[makaveli07]

If that's the primer why can't you just paint over that? The adhesion is great and looks like a good surface to paint.

It feels very smooth to the touch which makes me think paint wont stick very well to it, but im not sure

 

[fatblockabody]

The shine is gone, that should be all you need with good engine paint. Surface almost looks etched in the pictures?

 

[makaveli07]

The shine is gone, that should be all you need with good engine paint. Surface almost looks etched in the pictures?

Its actually smooth to the touch and i would actually call it a semi gloss type of shine. Hard to explain.

 

[etemplet]

Wash it down good with solvent, let it dry thoroughly and paint it. Heat dissipation mah azz. It's paint. Get R Done.

 

[makaveli07]

Wash it down good with solvent, let it dry thoroughly and paint it. Heat dissipation mah azz. It's paint. Get R Done.

Its a pretty smooth surface, no need to scuff ? I was thinking scuff it with 400 grit then paint. Or is there no need to scuff it?

 

[1of500]

Next time with motor assembled try bead blasting. Be sure to block off all mating surfaces.

 

[etemplet]

Its a pretty smooth surface, no need to scuff ? I was thinking scuff it with 400 grit then paint. Or is there no need to scuff it?

It was blasted correct? All you need to do is get the dust and dirt from the surface and Sometimes I use Bulldog Adhesion promoter then the paint. 400 grit is for sanding cars I use 120 LOL I just want to get under the corrosion. Paint is for protection unless you're putting the ski in a boat show. You've done better than most already. Better than me for sure. Good Luck !!