49 ar

[bmiller36]

I have a 49 AR that has sat in my shop for about 4 years, was working on the sheet metal. Yesterday I decided to get it started, it hadnt run in probably 6 years but after cleaning the carb and mag it started fine and i drove it out of the shop and into the shed. Thats when I noticed it didnt have any oil pressure it had already run for about three minutes I shut it off and installed a new gauge restarted and still no pressure. Could the pump key be sheared? Never had this happen before any help will be apprecated Thanks Bob

 

[Charlie M]

Sorry for sounding crazy but you do have oil in it- right? It would be like me to drain it a while back and forget it didn't have any later.

 

[Patsdeere]

I'm assuming a JD, which is what I'm basing my suggestion on. Sometimes they lose prime if they have been empty for a while. You can either overfill it some and see if it takes or put a bit of grease in the pump. My guess is a worn pump so can't pickup the oil as easily as a rebuilt one.

 

[wore out]

(quoted from post at 11:11:04 06/26/22) I'm assuming a JD, which is what I'm basing my suggestion on. Sometimes they lose prime if they have been empty for a while. You can either overfill it some and see if it takes or put a bit of grease in the pump. My guess is a worn pump so can't pickup the oil as easily as a rebuilt one.

Wouldn't the pump already be completely submerged in oil?

I would sure check for a broken coupling BEFORE starting it again!

 

[Patsdeere]

Yes, but if the pump is written it can
sometimes have an issue with priming.

 

[Richard G.]

Pump coupling is broken.
It is right under the governor.
Take the crankcase cover off and you will see it is missing.
It is just a small square tube on the shaft going down to the pump.
Don't run it anymore til you check it out.

 

[old]

I agree had that happen on my 1935 JD B years ago

 

[Patsdeere]

But wouldn't that have been the case when he brought it in to the shop? Just sitting for 6 years doesn't make things break.

 

[old]

Gear type pump and if it sat a long time good chance condensation got in it so the water sat in the gears instead of oil and they rusted tight so the pump coupler broke

 

[Richard G.]

Sitting 6 years and sludge settled down in the bottom where the pump sits puts a strain on it when first cranking.
It is easy to check and would be the first thing I would check.
I had an AR that did just that.

 

[bmiller36]

yes the pump coupling is broken. I have a good number of two cylinders and have never had this happen! So my next foolish newbie question is how to go about fixing it. I really appreciate your help, Bob

 

[Richard G.]

Agree.

 

[old]

On my B I had to take loose the pipe going to the pump and then drop the pump out the bottom and then put on a new coupler.

 

[fixerupper]

What Patsdeere is referring to is for the very early models with the oil pump up behind the flywheel. My 35 A made April 5 of 35 has the pump behind the flywheel, Old's B has the pump in the belly so the change must have been sometime in 1935.