Sounds like the old engine was running good besides the crack so to me Now would be a good time to completely tear down and fix the cracked bare block. Rinse it out real good so you know the shavings are out. Leisurely put it back together it and put it in a truck that doesn’t have to work hard anymore. Just like @woreout said. I don’t like to see good things go to waste and I don’t like to see things scrapped that can be reasonably fixed and repurposed in other ways.
4MG Rebuild
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Oxbow, Feb 19, 2024.
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My ole g30 1 ton service boxtruck has a a piece of cardboard for a wintertime thermostat .
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Well, all except for the liners the block is stripped.
The crank looks to be in decent shape, a couple of the journals have a light scratch that you can just feel with a fingernail.
Five out of six rod cap bearings had a similar bad spot. I'm curious as to what caused this.
The thrust washers look good to my untrained eye.
I need to look at the cam closer, but nothing looked bad to me. The cam bearings in the block had some uneven wear in a couple of them. I'll dig into that later.
We developed a fairly safe system for flipping the block over - at least no one lost any fingers!
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This engine really doesn't look like they had a ton of miles on it since rebuild. We are planning to put the new head from the other one on this one. I need to inspect the cam yet, and the cam bearings. I'll get some better photos and get everyone's opinion.
More to come!
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