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Bi-directional pistons??

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Robert (ID)
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Joined: 24 Aug 2004
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PostPosted: Tue Nov 12, 2019 7:09 pm    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote

Yes that's the right number for the rings! Parts Spring?? never heard of that one before..

I'll see if I can get pics of the pistons in the next few days.

Ive wondered about boring out the head bolt holes with the mill or magnetic drill. Id also have to bore out the rocker arm shaft and supports that could be tricky..


Kentucky, well I don't see us swapping blocks then..

Thanks again
 
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Destroked 450
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Joined: 31 Mar 2016
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Location: Harned, Ky.

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PostPosted: Tue Nov 12, 2019 7:23 pm    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote

CVPost-Robert (ID) wrote:
(quoted from post at 22:09:07 11/12/19)

Kentucky, well I don't see us swapping blocks then..


Darn it!
Guess I'm back to drilling on mine.
Good luck with yours.
If you in up going with a rebuild kit check out Ag Kits, they have reasonable prices with Reliance parts, good stuff.
Rebuilt a DT466 in a combine recently with Reliance parts, I was impressed with the quality.
This site also sales kits but I haven't used one yet.
Normally get my kits thru my local machine shop, they give me a good discount.
 
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Tramway Guy
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PostPosted: Tue Nov 12, 2019 7:51 pm    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote

The 6-71 (in fact ALL -71 series engines) were not opposed piston design. There were ports in the side of the block that were pressurized by the Blower; and there were exhaust valves in the head.

There were 2-cycle engines made like you mention, but they were usually very large engines like for Ships and perhaps locomotives; and also German Junkers aircraft Diesel engines of WW2.
 
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Robert (ID)
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PostPosted: Tue Nov 12, 2019 7:58 pm    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote

I have used kits from here on a customers 8n.. My last rebuild for myself was a 2000 3cyl gasser, I used a reliance kit for it... ive had good lock with both.. Ag Kits is the retail side of reliance.. ive been on the phone with both sides and they have great customer service.

Thanks again... ill keep posting as I proceed
 
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Destroked 450
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Location: Harned, Ky.

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PostPosted: Tue Nov 12, 2019 8:12 pm    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote


Not sure about today but locomotives used to run EMD "Electromotive Diesels" similar to ones used on river barges.
Large V configuration in 12, 16 and 20 cylinder, basically a really big 2 cycle Detroit Diesel with a 18" bore and 24" stroke.
I worked in the engine room a river barges when I was a younger man but I was to dumb to stay there and make a career out of it.
I'd be setting on a nice retirement check now if I had. :cry:
 
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Sean in PA
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PostPosted: Wed Nov 13, 2019 5:01 am    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote

Quote:
Yes that's the right number for the rings! Parts Spring?? never heard of that one before.


https://www.partspring.com/

They are similar to Messicks in that they are an authorized New Holland dealer and can get anything that you could get at your local New Holland dealer, plus shipping of course.
 
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MikeJM
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PostPosted: Wed Nov 13, 2019 7:12 am    Post subject: Re: Bi-directional pistons?? Reply to specific post Reply with quote

Drilling the head shouldn t be a problem. A neighbor installed a 304 short block in a 7700 with the 256 head, couldn t find a 256/268 at the time. He drilled the head out himself with no issues. The rocker hold downs and shaft shouldn t be an issue with a mill or a good drill press.
 
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