Oil pump O ring leaking

[mal fitz]

Oil pump o ring leaking, just done an oil change…., do I need to drain oil to remove pump and replace O ring?

mal

[marshman]

No need to drain the oil, but you may have to remove the exhaust down pipe to allow you to fully remove the pump. Watch for the hex pump drive dropping out when you remove the pump - some stay in others are loose. Also some say they have trouble priming the pump after refitting, I have never had this problem I just make sure the pump is "wet" with oil.

BEFORE you remove the pump just make sure that the oil is leaking from where you think it is. There are several places above the pump - transfer housing is a favourite - that can make it look as if the pump is the guilty party. It could also just be the "o" ring on the pump PRV (relief valve) which is very easy to change.

Roger

[mal fitz]

No need to drain the oil, but you may have to remove the exhaust down pipe to allow you to fully remove the pump. Watch for the hex pump drive dropping out when you remove the pump - some stay in others are loose. Also some say they have trouble priming the pump after refitting, I have never had this problem I just make sure the pump is "wet" with oil.

BEFORE you remove the pump just make sure that the oil is leaking from where you think it is. There are several places above the pump - transfer housing is a favourite - that can make it look as if the pump is the guilty party. It could also just be the "o" ring on the pump PRV (relief valve) which is very easy to change.

Roger

Thanks

[Roy_S]

No need to drain the oil, but you may have to remove the exhaust down pipe to allow you to fully remove the pump. Watch for the hex pump drive dropping out when you remove the pump - some stay in others are loose. Also some say they have trouble priming the pump after refitting, I have never had this problem I just make sure the pump is "wet" with oil.

BEFORE you remove the pump just make sure that the oil is leaking from where you think it is. There are several places above the pump - transfer housing is a favourite - that can make it look as if the pump is the guilty party. It could also just be the "o" ring on the pump PRV (relief valve) which is very easy to change.

Roger

I'd second that advice.
Mine was dripping oil onto the exhaust, could smell this when starting the car, I was all ready to replace the oil seals when Paul at stag Classics said check the rocker box seal first as he didn't think the pump was the culprit. My car was in with them at the time for a steering rack and rear brake hoses, and I'd asked him to check the oil pump leak.
Sure enough, screws at rear of rocker box were not tight, and no oil leak since. I now check every now & then by running a finger round edge of rocker box, at some point I'll probably replace the gasket but for now all good.

[sujitroy]

There is a lot of discussion about the oil pumps dripping and the current new O Rings don't seal. some folks use metric size O Rings which are slightly bigger. I have to redo mine.

[singapore stag]

I had an oil leak, thought it was the pump. It was the rear of the right hand rocker/ cam cover gasket. You will be surprised the amount of oil that can be found on the floor. It took me a few days cleaning and checking as to where the leak was. New gasket was fitted not long ago, so I tighten the bolts near the rear end which were a bit loose then smeared a bit of tiger seal with my finger near the leak.
No more oil leak. The same for the Inlet manifold... a bit if coolant found in the V after a run, new gaskets a few months back fitted with tiger seal.

Took carb off and found a couple of bolts loose, nipped up and no more leak.