D15 149 Gas No Oil Pressure
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=163118
Printed Date: 04 Nov 2025 at 9:32pm
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Topic: D15 149 Gas No Oil Pressure
Posted By: Dan73
Subject: D15 149 Gas No Oil Pressure
Date Posted: 26 Jul 2019 at 6:29am
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A while back my D15 seized the engine. The rear main bearing was a mess and #2 and #3 journals on the crank shaft where deeply scored and where already turn the max 5 years ago when I rebuilt this motor. I looked like the crank shaft had gotten hot from lack of oil flow but the oil pressure gauge was stuck so I don't know what the pressure was. There was good coolant flow in the motor.
New parts crank shaft 4 sleeves and pistons Reliance over bore kit oil pump rebuild kit electronic ignition (engine always had a skip under heavy load) alternator (converted tractor to 12 volt negative ground to solve charging headaches.) Bearing and gaskets of course oil pressure gauge tempiture gauge voltage gauge
Resembled the motor and while adjusting the valves found there was no oil flow. Never thought to check the pressure. Shut down the engine but it was too late I damage the #1 piston seized the wrist pin and damaged the bearing. Everything else looks ok in the engine. I checked all the oil passages with air pressure and they are clear. Check the oil pump and can find nothing wrong with it. Checked the cam shaft and the drive pin for the oil pump is not damaged. But the oil pump never picked up any oil the oil filter housing was dry. I am totally stumped as to why my oil pump which looks perfectly fine with a new rebuild kit isn't pumping oil.
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Replies:
Posted By: MACK
Date Posted: 26 Jul 2019 at 6:38am
| Is the ball and spring in place in front of camshaft? MACK |
Posted By: Dan73
Date Posted: 26 Jul 2019 at 9:20am
| Yes the pump kit came with a replacement ball and spring. The ball was put to the pump side so the oil pressure will compress the spring same as the old one was installed. |
Posted By: Stan IL&TN
Date Posted: 26 Jul 2019 at 9:37am
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Did you prime the pump with oil? ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
Posted By: Dan73
Date Posted: 26 Jul 2019 at 9:50am
| No but how do you prime the pump when there is a check ball on the output side? The oil won't flow from the oil filter back to the pump. I couldn't see how it prime it unless you just fill the pump and counter bore before installing it and hope it doesn't flow back into the oil pan. |
Posted By: Stan IL&TN
Date Posted: 26 Jul 2019 at 11:33am
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Well scratch that Dan. I didn't realize the check ball was between the pump and the filter. ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
Posted By: MACK
Date Posted: 26 Jul 2019 at 9:11pm
| The ball that I'm talking about is in the front of camshaft with spring against front cover. MACK |
Posted By: john(MI)
Date Posted: 26 Jul 2019 at 9:22pm
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On my D14 149 engine, I took the oil filter off to ensure good oil flow. It just comes out of the tube and runs right back down into the output. No squirting to worry about and an easy check. ------------- D14, D17, 5020, 612H, CASE 446 |
Posted By: Dan73
Date Posted: 27 Jul 2019 at 4:51am
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Mack yes that ball is in the front of the cam shaft. It has 2 springs and two other parts that make up the assembly behind that plate. I double checked the assembly against the parts diagram and the service manual because it flew apart when I removes the cover and wanted to make sure I found all the bits. John thanks for the information on leaving the filter off I will definitely try that. But the pump never picked up any oil because the filter and the filter housing where both dry when I removed the filter to see what was wrong. |
Posted By: Dick L
Date Posted: 27 Jul 2019 at 6:13am
| It is a vane pump that is (NOT) self priming. The easiest way to prime the pump is to remove the oil filter and fill the stand pipe with motor oil. When I would rebuild this type of engine I would put a gas line hose over the stand pipe long enough to hold over the rocker arms, start the engine and watch the oil come out over the rocker arms. Remove the hose, screw the filter back on and start it back up to check the gage. No mess and I could see the oil flow with my eyes. |
Posted By: Boss Man
Date Posted: 28 Jul 2019 at 9:25am
| I all ways fill the pump housing with STP oil treatment. Nice and think so it stays in there and blends with the oil when running. |
Posted By: Dan73
Date Posted: 28 Jul 2019 at 5:36pm
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Thanks guys. My mechanic Gary came by today and we where able to prime the pump and get it to pump oil installed in the motor. I am still waiting for some parts before I can reassemble the motor but with the head off and both the cam and crank installed we where able to prime the pump and turn the motor over by hand getting it to pump oil out of a buck over the pickup line. Oh for the record Gary pointed out my mistake the check ball is not on the output of the pump it is an over pressure release which lets oil flow directly into the cam shaft through the drive of the pump. The main output of the pump doesn't have any check ball between it and the filter. Now all I need is the replacement parts to fix my last mistake and I should have my D15 back out in the fields haying. |
Posted By: Dick L
Date Posted: 28 Jul 2019 at 5:54pm
| I would prime the pump again just before the next start up. |
Posted By: Dan73
Date Posted: 29 Jul 2019 at 1:00pm
Thanks that is my plan. I was just really happy to see it pumping yesterday. |
Dick L wrote:Posted By: Tracy Martin TN
Date Posted: 29 Jul 2019 at 1:10pm
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I would check the pin in the end of camshaft that drives oil pump. Tracy ------------- No greater gift than healthy grandkids! |