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Subject: No Oil Pressure

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Jim Rushford, CA    Posted 08-16-2019 at 22:30:33 [URL] [DELETE]        [Reply] [Email]  
  • No Oil Pressure
  • Near new 8N Motor in my 9N. Like less than 20 hours. Fully rebuilt at a shop. Has run fine, 30 lb oil pressure cold, drops down when warm. No noises. Suddenly no pressure. Changed the gauge, since it was old. Still no oil pressure. Pulled out the relief valve - - looks ok - - nothing weird. Turned it over (with coil off) with valve out, no oil comes out. Pump rebuild kit with overhaul. Full of beautiful, clean oil. Again, it has been fine until now. Any Suggestions? Hate to tear it apart without suspecting what I am looking for. Suggestions? Ideas? Oil Pick up?

    Jim Rushford    Posted 08-18-2019 at 12:13:13 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • Cleaned out the screen on the drain plug. It was full of slimy crud. Filled up with 5-30 oil to flush out any remaining contamination. Ran until good and warm. Normal oil pressure immediately on start up. Re-torqued the head per shop recommendation. Plan on draining and filling with 30 wt. and new filter next weekend after a good warm up. Hopefully it will be adequately flushed out. May have dodged a bullet here. Per shop, oil showed signs of some moisture contamination. This thing gets driven around the neighborhood occasionally. Otherwise I have just been starting up in the garage and running for a few minutes to charge the battery and circulate some oil. Per the shop likely not running long enough to burn off condensation in crankcase. Lesson learned.

    TheOldHokie    Posted 08-17-2019 at 06:41:47 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No Oil Pressure
  • Fully rebuilt by a shop and 20 hours or less of run time. How many calendar days is that and what is the warranty on the shop's work? My first inclination is this is the engine shop's problem not yours.

    That said, a sudden and total loss like that makes me suspect the pickup tube. There have been cases of fresh overhauls where the crank was rubbing on the tube and wore a hole in it but I would expect some noise from that.

    TOH

    Jim Rushford, CA    Posted 08-17-2019 at 08:54:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • Actually overhauled in 2015. Time flys. I am thinking the tube too. Can't imagine something happening with the gears with no noise.

    Bruce (VA)    Posted 08-17-2019 at 05:06:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • Did you measure the gears before you installed the pump? Some gears out there are too small.

    Did you check the pick up tube?

    Jim Rushford, CA    Posted 08-17-2019 at 08:50:03 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • Measured the gears. There are 2 sizes. Made sure I was replacing the old with new that matched. The shop put it together so, don't know what they did with the pick up tube but, it has worked well for a couple of years. No hard work; just towing a trailer for hay rides or running around the neighborhood.

    TheOldHokie    Posted 08-17-2019 at 09:55:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No Oil Pressure
  • Loss of oil pump prime after setting for extended periods is a chronic problem with these engines. My next step would be to prime the oil pump and see if it regains pressure. If it does wait and see how long that lasts. If not time to drop the pan and do some inspection.

    TOH

    Jim Rushford, CA    Posted 08-17-2019 at 10:23:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • Good suggestion. How do I prime the pump?

    TheOldHokie    Posted 08-17-2019 at 10:52:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No Oil Pressure
  • Remove the plug for the pressure relief and pour a couple ounces of oil into the hole. Replace plug and start engine. If you get pressure you are good to go until it happens again. If not shut it down and get out the wrenches.

    TOH

    Jim Rushford, CA    Posted 08-17-2019 at 10:50:49 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • Figured it out. Still no pressure. Guess the pan is coming off.

    Jim Rushford, CA    Posted 08-17-2019 at 11:23:51 [URL] [DELETE]        [Reply] [Email]  
  • Re: No Oil Pressure
  • So this gets more fun by the minute. drained the oil that I thought looked pristine on the dipstick and this slimey stuff comes out, kind of a dark gray. The filter on the drain plug is full of the stuff. The pick up tube reaches down into it and is fine but probably not able to draw oil through the screen. Maybe water in the oil. Headed to the shop now.

    TheOldHokie    Posted 08-17-2019 at 11:29:46 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No Oil Pressure
  • I think you are seeing the tip of the iceberg.

    TOH

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