AR oil pump?

[GregoryU]

I've got a '49 AR (unstyled) that's seemed to have developed a good amount of oil leaks underneath around the oil pump area. I'd like to replace the oil pump gaskets. I've drained the engine oil and got a new filter and rubber ring for the filter cover and have the 2 lower gaskets for the oil pump caps ordered. I've dropped the lower cap which lets down the 2 oil pump gears and the shaft before I ran out of time yesterday. What will drop when I take the larger, upper body off?

 

[matthies]

Hope you have the top end opened up and the oil lines disconnected from the pump. Since you have the shaft out the coupler will fall unless stuck to the upper shaft, but not likely.

 

[GregoryU]

LOL! Nope...the shaft came down some but is not dropping free. So far I've just got the smaller cap off. So, how screwed am I??

 

[matthies]

You are fine, just go to the top crankcase cover and remove to look inside to access the oil lines. But I would put the drain plug back in and put a quart of old fuel in there to loosen the sludge inside with a brush or maybe puddy knife then drain again until clean, then once clean remove the lines and drop the pump.

 

[Mark-Ia]

Usually just the gasket on the round cover is blown out.

 

[GregoryU]

Yeah, I've tightened all the bolts and still had enough drips I had a nice little puddle. Nothing when I parked on the concrete last fall to pull the rear axles and put in new seals/bearings. Now that I've started it this spring and drove it around it's really leaking. Figured on putting in both gaskets. Maybe I'll just try a new gasket on the bottom cap (4 bolt) and see if that will do it.

 

[a49deere]

Yeah, I've tightened all the bolts and still had enough drips I had a nice little puddle. Nothing when I parked on the concrete last fall to pull the rear axles and put in new seals/bearings. Now that I've started it this spring and drove it around it's really leaking. Figured on putting in both gaskets. Maybe I'll just try a new gasket on the bottom cap (4 bolt) and see if that will do it.

Two problems I can see here! One, if the pump drive gear dropped down you now have to get square drive coupling lined up with pump shaft, hopefully it didn't fall into crankcase. 2nd, the gasket on the bottom of oil pump is designed for a close clearance for gears to build pressure. Installing more gaskets than designed may cause a low oil pressure issue. Jm2Cents!

 

[GregoryU]

Well, I haven't heard, seen, or felt anything drop yet so maybe I'm alright. Second, I'm not installing MORE gaskets, I'm just trying to install a new one to stop the leaking. Obviously I don't know what I'm doing but like Dad always said ''You can't learn any younger!". And, I doubt there's nothing here that can't be fixed...just a bit harder than replacing a couple of gaskets like I thought.

 

[matthies]

Best now to just push up the long shaft and gear, by itself and see if it engages the upper shaft and gets tight. This ensures that the coupler is still on the shaft/gear and is engaged to the upper shaft. If the shaft goes all the way in and you can spin the gear, then you are removing the top crankcase cover and start fishing for the coupler.