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Last night my friend's dreadnought was in close assault with my terminators. His MotF and a couple servitors moved into base contact with the dreadnought to make repair rolls. Couldn't figure out if this was allowed or not so I just let him do it , but also become confused because we didn't know if I could target him in the combat. (and I really wanted to )

Can a techmarine/MotF/warpsmith make repair attempts on a dreadnought engaged in an assault? If so, are they now part of the combat so can be targeted?

This sounds valid, but a bit quirky. There are specific actions disallowed in a combat (moving, shooting) but unless mentioned in each Codex, I don't think repair isn't among them.

As for combat, I don't have the rulebook to hand but I believe there's something about not being able to move into contact with models in combat unless piling in or charging. I may be thinking of just enemy models though.

The only thing that would prevent this would be your enemy models within 1" of the techmarine. As long as he could move to base without hitting that 1" mark, you can indeed repair.
They are NOT engageed in combat, as the techmarine etc does not have a model from HIS unit in base contact with an enemy model. So no, you cannot hit them

I only had two terminators so there was plenty of space for the techmarine.

interesting tactic. might be fun to make an ıronclad stormraven bomb wıth motf.