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PostPosted: Fri Dec 29, 2017 6:03 pm 
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Help me understand too?

You acid clean before you go to the machine shop? Then when it comes back, is it ready for the Hard Block? Or does it need some other process to clean up the surface rust that they come back with. At least all of the ones I have picked up have surface rust.

Rick

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PostPosted: Fri Dec 29, 2017 7:50 pm 
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Acid removes the rust, after you get the grease/oil off...

Lou

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PostPosted: Fri Jan 11, 2019 2:34 pm 
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Car Model*: 1981 dodge colt 144.396mph record
Howdy,
I'm going to be rebuilding a slant6 at some point, and was reading up on various procedures,, this one caught my eye.. DD says something about needing to have the deck resurfaced after either acid dipping or the molasses treatment..
My question is... what about the machined surfaces of the bearings or any other machined surfaces? if you gotta do the deck surface why not those surfaces too? or was it that those were expected to be done and just not mentioned? thanks..

and... should I have started a new topic on this? instead of asking a question on / in an old topic? I was not sure what to do.. I'm sorry if I did it incorrectly, lemme know..

thanks.. drive carefully


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PostPosted: Fri Jan 11, 2019 4:54 pm 
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Turbo EFI

Joined: Wed Sep 17, 2008 6:48 pm
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Location: Indianapolis
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I am thinking that the folks that wrote in this specific post are acid cleaning the water jackets to get maximum adhesion
when using a water jacket filler, necessary to stiffen the crankcase when pushing the limits on cylinder compression.

If you are doing a normal slant six rebuild, and if the water jackets are so corroded that they need acid cleaned, I would find a different
crankcase.

So yes, a new post listing your plans and expectations for the car-motor-rebuild would allow a better response.


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PostPosted: Sat Jan 12, 2019 1:29 am 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
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Location: So California
Car Model*: 64 Plymouth Valiant
The bearings are lined with bearing shells.

The deck is an actual sealing surface.

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PostPosted: Sat Jan 12, 2019 5:38 am 
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Car Model*: 1981 dodge colt 144.396mph record
I’m asking this question because I have not seen or touched the effects of acid cleaning a cast iron block, I’ve only seen the pics posted of a dirty then cleaned 4 cylinder block on this site. Probably, when I actually do the cleaning procedure the results will show me that it makes sense to just machine the deck and not the other machined surfaces. However, from a purely theoretical point, if the deck surface is damaged to the point that it does not seal, why do main bearing >supports< of the bearing shells not need machining also? I’m not trying to break anybodies chops, I think the answer to this question is important, if only to me.
Thanks drive careful


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PostPosted: Sat Jan 12, 2019 10:45 am 
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Turbo EFI

Joined: Wed Sep 17, 2008 6:48 pm
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Location: Indianapolis
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the top of the block, just like the bottom of the head and like the manifold faces are important sealing surfaces.

if the surface finish is too rough ( pits - gouges) the gasket will not have the ability to fill in and seal those defects.


As stated the bearing seats have bearing inserts on top of them, they do not make a 'seal' of any kind.


You should also know that it is standard maching shop procedure to Hot Tank the block and head prior to any machine work.


Typically the hot tank cleaning process will get the parts clean down to the metal..


Check out how well your chosen machine shop can clean your parts then see if any additional treatment is necessary.


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