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I asked about the noise in 3 of them because obviously I'm still searching for the problem. I didn't realize it was against the "rules". I was merely looking for more avenues to pursue.

Noisy NHC 250 Anybody else got a noisy NHC250 at idle? Mine sounds as one guy put it, like theres someone in there with a hammer beating on a coconut. Just a noisy banging sound. Oil sample was good so I'm not overly concerned but I'd like to know if it's just a normal noise for them.

85 M923 A1 NHC 250 water filter Anybody installed a water/chemical treatment filter on a NHC 250 cummins. If so at what point do you tap into the cooling system?? Anybody else have a noisy 250 at idle? like a fuel knock that clears right up raising the rpm. no miss,runs great. How about a...

I did run the compressor up till cut out and thats not it. I took if for a ride and it runs fine. No smoke, no miss, good oil pressure. The hammer on a coconut is a good description. Thanks for the replies. I hate to pass it up for the price. Its got super singles and bows/tarp, no rust. Who...

923 A1 Cummins 250 knock looking to buy an '84 923 A1 with a non turbo 250 cummins. 3400 miles and 1000 hours on it. appears to be in great shape. my only concern because I'm not that familiar with the engine. It is very noisy at idle, like a knock. The owner says its a fuel knock. It doesn't...

new here in Arizona, thanks in advance, just bought an 87 m923. supposedly remanned in maine depot in 2011. two questions, how do i tell if the engine was either rebuilt or replaced? guy told me the engine should have a reman tag on it with info that i cant find, its a natural 250 cummins. no...