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Joined: Dec 2010
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Backyard Mechanic
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OP
Backyard Mechanic
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Hi
Anyone ever have a gear type oil pump make noise off and on at an idle? 1933-36
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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I never heard of it and if the pump is clamped tight to the block I can't thing of any other thing concerned with the pummp. Could be in the pump to distributor shaft connection.
Gene Schneider
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Nov 2001
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Former ChatMaster ChatMaster - 5,000
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Former ChatMaster ChatMaster - 5,000
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The pump might be low on oil.  I'd tend to go with the other thoughts... Is the thrust washer in place? If not, then the shaft might be pulsating up and down with small changes in RPM.
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Joined: Dec 2010
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Backyard Mechanic
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OP
Backyard Mechanic
Joined: Dec 2010
Posts: 409 |
It has the washer in place under the distributor.
I have lifted the distributor when running and no change. This is a new engine all new bearing earthing is new and tight. I have about 2K miles on it so far runs superb. I have heard from day one, a rubbing or slight knock sound and have listened with a broom handle at least 10 time all over the engine. It is coming from the nut that holds the oil pump to the block and the sound travels along the cam to the timing gear or at least that's the loudest part of the engine that I hear it (the nut that holds the pump). I have dropped the pan 4 times. The last time I dropped the pan I took each rod cap off removed one shim and torqued the rod and tried to see if I had end play. On two rod I replaced the .0025" shim with .001" shim on one (1) side to tighten the rods. Anyway I am convinced it's not a rod. I also took out the distributor and turned the pump over with a drill motor (used an extra distributor without the gear) and I heard the noise so I'm pretty sure its the pump. It is a NOS GM gear type pump. I'm not worried about the noise but it always seams to make more noise when I end up at a car show! Embarrassing to say the least.
I forgot to say that about 1200 rpm it completely goes away.
Last edited by ab_buff; 11/11/14 10:11 PM.
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Joined: Dec 2010
Posts: 409
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Dec 2010
Posts: 409 |
I never heard of it and if the pump is clamped tight to the block I can't thing of any other thing concerned with the pummp. Could be in the pump to distributor shaft connection. Today I tried backing off on the set screw that holds the pump in place just a little (up to a 1/4 turn) while the engine was running and it went away for a few minutes and the came back???
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Joined: Aug 2006
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ChatMaster - 1,500
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ChatMaster - 1,500
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Hi Dale, Only 2 things come to mind. The pump could be defective causing gear noise or, and I doubt this, but if you replaced the fiber timing gear with a metal one the noise could transfer along the cam to the area you are hearing it. I think metal gears are noisy and that is why they used the fiber one. Just a couple thoughts and probably wrong! 
Ed
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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33-36 didn't have aluminum gears.
Gene Schneider
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Joined: Aug 2006
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ChatMaster - 1,500
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Were any available after market?
Ed
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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No.
Chevrolet only installed the aluminum gear in big trucks from about 1950 and up. It just happens to fit a 1937 and up 216.
For a regular stock passenger car with a well oiled timing gear - it will last for 100,000 miles or more.
By that time the 3 main bearing engine was dropping off fast.
Gene Schneider
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Joined: Aug 2006
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ChatMaster - 1,500
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ChatMaster - 1,500
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OK, thanks Gene. I thought maybe some aftermarket company came out with one. I have never used anything but stock type fiber gears in my cars but have read that some do use the aluminum gears.
Ed
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Joined: Nov 2001
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Former ChatMaster ChatMaster - 5,000
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Former ChatMaster ChatMaster - 5,000
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Dale, It sounds like you've narrowed down the problem -- I also took out the distributor and turned the pump over with a drill motor (used an extra distributor without the gear) and I heard the noise so I'm pretty sure its the pump. It is a NOS GM gear type pump. Next step is to just replace the oil pump. Or take it out and bench-test it until you're convinced of what the problem is and try to fix it.
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Joined: Dec 2010
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Backyard Mechanic
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OP
Backyard Mechanic
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I was trying to avoid that but that may be what I have to do.
I have decent oil pressure, about 12-15 psi at 50 mph and 5-7 psi at an idle hot.
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