Removing the oil pump

[jddevel]

According to the Blower book the oil pump is removed from the block by using a "suitable pulller" on the drive gear shaft.Having made a gap between the pump face and the block I attached a puller between the gap and the spindle. However all that has happened is the drive shaft has moved into the sump and jammed against the camshaft. What have I done wrong please. Also although not mentioned or shown in schematics I assume there is a key in the slot in the drive gear/shaft.

[Steve Simmons]

I haven't run into that but maybe try removing the idler gear shaft. The thread is 8 x 1mm. Thread a bolt in and pull the shaft out. Then you can twist the pump which should make removal easier. I seem to recall that some gears were integral with the shaft while others are keyed.

[bloodysalmon]

I'm assuming youre both are removing a pump with the engine out? If not, may I pose the question on how best to remove a oil-pump with the engine in situ? Limited space to remove the 8 long bolts due to close proximity to n/s chassis rail

[jddevel]

I`ve shown a picture of the situation as is. As can be seen the pump is on it`s way out_ That was actually achieved in the normal way. Bolts out and gently (its cast so beware) tapping with a hammer whilst pulling. Having got that far and it refusing to budge further thought that by removing the clip on top of the drive shaft I could press the shaft into the block thus allowing the drive gear to come off. No jammed against the camshaft. So as this was going to be a total strip down got everything out icluding the camshaft and am left with a pump still in the same position. I`ve stopped for today and have not pressed the drive shaft again as I can`t guarantee that it will clear the lip of the block piston barrel. I will try Steves` suggestion of pulling out the idler shaft but am becoming convinced that there is a key in the drive shaft and that is causing my problem. I`m also concerned that to much pressure on pressing out the drive shaft into the block may damage the groove for the retaining clip. If the key any suggestions??

[Tom Lange, MGT Repair]

When I remove an oil pump, I use an M8x1.0 in the driven gear stud, and pull it out of the block with the help of a socket and washers. Removing that stud allows the pump to rotate 360, and then it just pulls straight out. NEVER use a puller!

The only key holds the drive gear and shaft together, and you must increasingly support the height of the gear as you tap out the shaft. If you just try to tap out the shaft without supporting the gear, the key digs into the housing bushing, and you will not get it out that way.

I think that is what has happened. Since they are both bevel gears, the pump drive gear cannot jam with the camshaft gear.

Tom Lange
MGT Repair

[Kenmgtc]

I think Tom is right. You would have to remove the Idler shaft as recommended above so you can spin the whole locked assembly out. Normally it just 8 bolts and they slide right out unless someone has used rtv on the paper gasket.

[SteveW]

From the description of the problem it sounds to me as though the drive shaft of the oil pump has seized in the block. Maybe a good soak with WD40 followed by gentle tapping is the solution.

[jddevel]

Thanks all. It's out. Turned out that the two oilways into the drive shaft tube were virtually solid with carbon which had also formed in the recess in the middle of the shaft causing it to jam. Took ages to free off.