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AR Oil Presure

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Randy Simmon

06-17-2003 18:16:24




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I have just finished restoring a 1939 unstyled AR. I overhauled the engine, new rings, ground the valves and had new seats put in the head. I started the engine for the first time last night and after awhile the tappets started making a loud noise. I pulled the tappet cover off and found that no oil was getting to the tappets. I had good oil presure while I had it running. The oil gauge read at between M and H. There is no oil line coming from the head like the newer models had. There is a line coming from the govenor housing and I'm asking if that is the oil line or is it a breathing line. And if that isn't a oil line then how does it get it's oil to lube the tappets. Also, while it was running it started to vibrate and it made the fenders rattle. I'm wondering if maybe the main bearing might be bad on the crank. Can anyone help me with these problems. The serial number is 256322. Thanks, Randy Simmon

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Rudy in TX

06-17-2003 19:35:09




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 Re: AR Oil Presure in reply to Randy Simmon, 06-17-2003 18:16:24  
Randy, I noticed the same thing on the oil getting to the tappets on my 1940 AR. I just finished overhauling it and the first time I started it I noticed I wasn't getting any oil to the tappets until I increased the engine speed to fast idle. You might want to check the oil trough inside the valve cover and make sure its clean and oil will come out of the small holes in it. My AR vibrates slightly at slow idle but it quits as I speed the engine up. I think some vibration will probably be normal at slow idle.

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Clooney

06-17-2003 18:43:08




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 Re: AR Oil Presure in reply to Randy Simmon, 06-17-2003 18:16:24  
Randy, those rocker arms don't get much oil. The oil they do get runs down that pipe from the governor. For the oil to get into that pipe the engine must be run at a fairly high RPM & the governor gears must toss the oil around & into the well that feeds that pipe. If you just idled it when it was running not much if any oil will get into that oil pipe. ~Now if you ran it at fast idle for a while & there still isn't oil in that pipe you might have a blockage in the governor oil feed hole [that is the one that directs the oil onto the governor gears]...
~On the vibration, that depends on the engine RPM & how bad the vibration. If it's real bad you could have the flywheel or clutch driver installed incorrectly. [are the matching marks lined up on both the flywheel & clutch driver?]..If the vibration isn't too bad it could be normal, some do vibrate a little. Does the vibration change with the clutch engaged or disengaged? Does the vibration get worse as the RPM is increased?

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