United were up against former boss John Sheridan at Boundary Park on Saturday afternon.
And Paul Simpson's third game in charge brought an unchanged starting eleven for a third consecutive game, with the bench also untroubled on this occasion.
Both teams started brightly, with crosses cut out by attentive defending, but a whipped delivery from Piergianni was just a whisker in front of Hope as he threw himself at it.
The Latics won an early corner when Hart floated a high one that dipped towards the bar. Howard made sure it went behind, and United then had three crosses from Adams to contend with in quick succession, with each one being blocked or dealt with.
Jordan Gibson almost found the perfect through ball with nine minutes on the clock as he curled it round Hart for Patrick to chase. The forward got there just a moment too late.
There were loud appeals for a penalty moments later when Devitt controlled a clipped pass from Dennis at a tight angle. His touch would have set him free, and it appeared to be a hand that stopped it, but the referee showed no interest.
Good work from Armer took him beyond Clarke and a volleyed delivery found Patrick in space. He misjudged his 10-yard header and it looped high.
It was played at a frantic pace and a clearance from Simeu was touched on by Gibson as he spun away from Clarke in the packed midfield area. There was room to run into and the wide man rode another challenge before trying his luck from 20-yards. It had power but it was easy for Rogers to take.
Carlisle crafted another good move in what was a good spell for the visitors when Dennis was gifted possession. Gibson and Devitt got involved, and a floated pass put Riley into the box. He miscued his volley and Piergianni was able to clean up.
Simeu had a pass picked off when he tried to spread it to Gibson, an Oldham flooded forward. It came to nothing as Feeney got his head to the resulting corner.
The hosts were awarded a penalty on 25 minutes when roars for a handball from Simeu accompanied a free kick delivery from Adams. The whistle blew but Howard was superb as he went the right way to stop the Keillor-Dunn spot kick with his legs. Bahamboula was first to the rebound but he punted it wide, much to the delight of the travelling fans behind the nets.
Howard was in action again when Hart drilled the ball past Riley. Keillor-Dunn struck it, and the stopper palmed it down before picking it up. Hope was booked as he arrived late with a high boot.
United went close just before the break when Patrick took the ball from Dennis. Gibson asked for it, and he had Riley in support. A deep cross from the right back eventually sat up for Devitt, but he was under pressure and his rasper crashed into the side netting.
Bahamboula sent a close-range header high over the bar when he got on the end of an Adams cross, and Piergianni put one onto the roof of the net when the same player flighted a corner his way.
The Latics took the lead with the last kick of the half in the third minute of added time, when a cross from the left caused all kinds of problems. Mellish sent it onto his own post, and Missilou caught the spinning loose ball all wrong when he dragged an effort across the face of the target. It didn't matter as Hallam Hope buried it from just three-yards out.
United were back on level terms just three minutes after the restart when Gibson stole possession in midfield. Dennis wasted no time in sliding it onwards, and Omari Patrick showed his confidence and composure when he strode forward before slotting it home to make it four goals in his last five outings.
There was defending to do as Adams and Hart peppered the box, but Hope flashed a header wide and the Cumbrians were able to settle back into their shape.
Armer worked hard to keep a positive situation alive, as did Mellish, and they kept the hosts pinned back as they got support from every player in a black shirt. Devitt bided his time before pulling into space and he was disappointed when he clipped a curler into the stands.
Oldham had a spell of their own where they had plenty up front but Simeu and Mellish were on hand to make timely interventions. Adams stayed out wide and Keillor-Dunn got on the end of an outswinger, but it lacked control and Howard watched on in comfort.
The away side should have turned the game on its head on 75 minutes when a surge from Riley opened things up. Gibson delivered on the run and Patrick arrived late to head it. The fans were ready to celebrate but he couldn't quite find his bearings and it whisked over the target.
There was a difficult dipper from Adams for Howard to get fingers to late in the day, and he did just enough to make sure that Hope wasn't able to apply any kind of touch.
Patrick did the battling to keep two at arm's length on the edge of the area on 80 minutes and he cut it back for Devine to meet. The shot was low but straight at Rogers.
There was a scramble from a Guy corner when Sho-Silva nodded it down and back into the six-yard area, but the stopper pounced as the ball rolled through legs.
United thought they'd won it in the final minute when Clarke gave it away to Devine. He used Patrick who fed it onwards to Gibson. Two touches later he crunched a volley just wide.
Guy then tried his luck from 18-yards and Rogers was relieved when it went past the post after it had skipped off the surface and hit him on the chest.
The Cumbrians kept going and they got the ultimate and much-deserved reward when Feeney found the top corner with a pinpoint header from a fantastic Guy free kick which hit the bar then the post before going in.
Oldham Athletic - Hope (45+3)
Carlisle United - Patrick (48), Feeney (90+3)
Oldham Athletic - Bahamboula (27), Missilou (27), Hope (36), Adams (36)
Carlisle United - Mellish (27), Simeu (27), Feeney (90)
Oldham Athletic - Rogers, Clarke, Hart, McGahey, Piergianni (c), Adams (Stobbs 87), Whelan (Hunt 80), Hope, Keillor-Dunn, Bahamboula (Obadeyi 69), Missilou. Subs - Leutwiler (gk), Hopcutt, Couto, Vaughan.
Carlisle United - Howard, Riley, Simeu, Feeney, Mellish, Armer, Gibson, Guy (c), Devitt (Devine 72), Patrick, Dennis (Sho-Silva 72). Subs - Norman (gk), Alessandra, Whelan, Roberts, Omotoye.
Referee - Sam Allison
Assistant Referee 1 - Ivan Stankovic
Assistant Referee 2 - Anthony Moore
Fourth Official - Tom Reeves
Observer - Michael Naylor
Attendance - 7,327 (1,294)