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  #11  
Old February 25th, 2019, 12:39 PM
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Default "Babbitt"

Thanks for sharing that term; I had not heard it before. I did a little reading up on Babbitt and Chevy engines, and I found this forum thread:

https://www.chevytalk.org/fusionbb/s...hp?tid/277213/

They talk about a 235 inline 6, but after 1953 it seems most engines were changed from a splash oil design to a high pressure oil design, so they aren't manufactured using Babbitt alloy after that...I think.

The engine in my M715 is (by casting number) a 1973-74 Chevy 4.1 L (250 c.i.) inline engine. I think that means it's passed the dates of the Babbitt alloy used in the manufacture.

I am going to rebuild the engine at some point in the next couple of years. Right now, I need to make it safe to drive, stop the leaks, and abate the rust.

Plan my work, then work my plan.
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Last edited by plumas.placer.miner; February 25th, 2019 at 05:20 PM.
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  #12  
Old March 25th, 2019, 05:57 AM
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Default I got side-tracked...

The rust abatement got me thinking about sand blasting. I found a great deal on this compressor (I love Craigslist when it works as advertised), so over spring break I installed this beast outside my shop, and the manifold inside my shop. The 1 phase, 5HP motor and adapter brackets will be here in a couple of days.


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  #13  
Old March 26th, 2019, 05:55 AM
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Default

Great truck.
The 250 is a fantastic engine. If I remember right the rear main seal is a 2 piece you can replace without removing the crankshaft from the engine. And the valve cover is prone to leakage after they've been worked on... By that I mean they get bent out of shape easy when they're pulled and won't seal correctly after that. Usually if somebody used a wire wheel to clean the mating surface, that'll deform the metal just enough that it'll leak.
All tins are like that but the old Chevys seemed to be a little thinner metal to me. You might be able to find a new one if that's the case with yours.

And if it's like every other truck on here it'll need new wheel cylinders and rubber lines for sure. and if it's the original master cylinder, the old seal on it will start leaking when you start driving it regularly.
The E350 wheel cylinder conversion and a dual reservoir master cylinder conversion are pretty cheap and easy.

Beautiful plumbing job on your air lines!
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