Looks like you're on the right track for getting it sorted out. If you decide to replace the radiator, Champion makes a nice aluminum radiator that fits the TD rig. There are some threads here on the site about it.
Once you have it sorted out, it's my understanding we should run fleet diesel...
Agree with others to check your glow plugs resistance. It's not hard, and they are relatively easy to reach. Make sure the connections are solid, they can lose their spring and not fasten to the top of the glow plugs well.
While it does sound like a glow plug issue, you didn't mention your fuel...
Even at max tuning, a stock OM606 looks to be well below the Horsepower of a 6.5TD, based on WikiPedia details.
An OM606 might fit, with enough jamming and adapters, but it might be a very slow ride.
Subtitle: Improving Performance & Economy" Volume 1
Published by the Diesel Page dot com
In good condition, small stain on the front cover.
Costs about $30 on the site plus S&H, I'm asking $20 delivered. Note that the site sells it as Volume 1 and 2 combined, this book is just volume 1.
I made half doors a few years ago using frames from doors in that condition. I wasn't able to sell them much, so I'm not particularly interested, sorry, but someone might be for that use or another.
Tip: They are reasonable to ship ($$) if you strip them and they can lie good and flat and...
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