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Start by breaking the system in 1/2. Test at the 7 pin plug to determine if it is a truck or trailer problem.

Just run the over head and check not the hard! Loose means nothing unless you’re on the valve set marks! That space is there to make the engine brake function! 220 is bolt tourque that said as Joey mentioned top end with studs ! Esi Engine 53 quart pan!

Those head bolts are torqued to 205 lbft. A 3/4" breaker bar with a 3/4" socket should do it. 220 lbft is the highest i would go, when going back together, but 205-210 is plenty. Do you have the torque pattern, and it is 3 rounds tol done..

What is bad ? Compression, water pump, both..?

Sorry man, I don’t have a clue about anything that New

That truck is on Craigslist here too. Looks like an Osterlund hood on a Diamond Reo from the brief Diamond Reo period. It looks pretty good in the pictures and seems even the interior is in good shape. It's not very far from me and even closer to Joe C. Cool old truck.

yeah real fair price for something that doesnt need anything,,,,i havent seen one in years

it looks dynomite

Just got off the phone with my mechanic and he said he ran all the compression tests, etc. Checked out the water pump and he said its extremely bad. The cause of the issue. Going to go check it out and get some pictures. Hopefully this is it.

If my memory is correct, which is doubtful I reckon the head bolts are 220 pound so thats pretty tight, yeah a breaker bar and pipe as Geoff suggests is probably needed Paul

There's another thread were the chassis is getting done, Vlad rivets the chassis back together and all All very impressive stuff I'll let Vlad tell the story as it's his story, or do a bit of a search and you'll find it all Paul

That’s just weird. I completely missed the entire deal. Thanks for that Paul. Yes I got my answer. That was a hell of a lot of work nice and detail though so hats off to you.vlad

Here you go Bob Paul

3/4" breaker bar and cheater pipe are my go-to for stuff like that. Cheap to replace if something lets go. I have a torque multiplier for going back together.

12V92 Detroit would be even sweeter!

Drop in a N-14 or a Big Cam 4 444 and that would make a sweet heavy haul rig, even on walking beam.

Welcome back Larry. .....Hippy

It has started. Will take time, not sure how fast it will happen. I have legs made up to get it off the floor and I can drop the pan. Local guy has std pan that he will trade for my ESI pan(that won't fit my chassis). Found a couple loose exhaust rockers(like more then 1/8" lash)hope that isn't a cam failure! Didn't make any bad noises while running and had 70# oil pressure. Will investigate that further. My 3/4" IR won't break the head bolts loose, but was using adapter for 1/2" socket. Need to buy a good 3/4" socket and see if that improves the performance. Should have some updates next week?

That orange B is my second best B. The marron one from Bisom is my first.

That was very interesting thanks for that. This planet will never see world peace and as far as a civilized society, good luck with that,although you can’t tell some people that.

Saw on Marketplace. Thought it was worth passing along since it looks unused. Sucker looks like they bought it and never used it for anything. Hood says Giant on it. I thought the Giant name was used when Osterlund took over assembly of them which was considerably later than 1971. in 71 they would have still been a division of White Motors. But I'm not up on my Diamond Reo history. Anyway its a really good looking truck and would make someone a nice collector piece who doesn't want to do a full blown restoration. Diamond Reo - Commercial Trucks - Hazleton, Pennsylvania | Facebook Marketplace | Facebook

https://www.breitbart.com/europe/2025/07/09/chinese-citizens-arrested-accused-of-stealing-plans-to-ukrainian-designed-cruise-missile/

I wonder what its original vocation was? 1st thought was "turnpike doubles" but not with that wheel-base. Daycab cabover with V8 must have done something that required that? Day cab cabovers don't shorten things very much from a single bunk sleeper, and having the sleeper is nice. So back to the 1st question.

wow,,,looks excellent thanks for that,,,