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Discussion Starter #1
Hello all, I have a lovely '73 Oliver 1365 4 cylinder diesel that slowly developed a knock which eventually became a bit of a misfire when cold. I measured the temp on the exhaust manifold and was rather confident I hand singled out the culprit, pulled the injector and it was caked in carbon.
At that point I decided to pull all four injectors; turns out they're all caked in carbon. Is this normal for a tractor of it's age or do I have another issue? When I say caked in carbon I mean more than a film, it's built up pretty good and a bit flakey.
I looked at the air intake and see no issues there though I've not taken apart the intake manifold area.

Thanks kindly!

Dave
 

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Discussion Starter #2
I should mention the injectors have been taken into a shop for cleaning and calibration. Just hate to put them back in if there might be another issue.
 
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