Thanks for this video. I was debating on replacing my transmission oil pump for a light duty passenger car. I have some light scoring on the outside housing channel because of some small burs on the outside of the ring gear. I took some 800 grit and wet sanded it with oil. The scoring and some of the burs are still there but I think I will be good. I know now whats important to check.
You are welcome! Scoring is extremely common on transmissions because of the abrasives off of the clutches. For manuals with a lubricant pump they experience the same kind of damage but from syncros and gear wear. Transmissions gears are generally tighter at .002-.004 clearance on the tooth-tooth and the width clearance is about the same.
Any idea if the gear set being out of spec would produce intermittent oil pressure? Sometimes I have pressure on start up, sometimes it takes about 30 seconds.
I'd like to ensure that the gerotor-type oil pump of my new Harley is within spec by having it inspected as there have been quality control issues. Could I take it to a good engine & machine shop for that? Should it have a minimum number of running hours on it first to allow abnormal wear patterns to appear? Thanks for your advice!
You could, alot of these techniques are feel techniques so what you get will vary based on how much you have used feeler gauges. The gears should not abnormally wear or change appreciable after you run them. So brand new or after the fact should give you the same result. The manufacturer should be able to provide the specification. In most applications between .002 and .006 on the tip to tip, Body between .002-.006, and width clearance from .002-.001 are typical.
@@thetruechaos , thanks a lot Travis. That gives me something to go on and if I don't feel confident with the feeler gauges, I'll seek somebody with experience to inspect it.
@@99zman Scratches come in a couple of different flavors. There are lap marks which are where very small pieces of debris that make something you can see but cannot feel, and then there are large debris marks which actually gouge the surface. If the gouge is from one side to the other, you will lose some pressure from it. More often the issue is just wear, unseen uniform wear can build up on the oil pump housings and cause excessive clearance. Its recommended to replace the housing if it has more then 50k miles on it.
Factory specification for width clearance is between 25µ-100µ depending on the vehicle. This inspection process is now depreciated for us, but is still an excellent guide for people who are interested in verifying your gerotor assemblies.
Awesome explanation video 👌
Some interesting info on a subject that's hard to research... thanks!
Thanks for this video. I was debating on replacing my transmission oil pump for a light duty passenger car. I have some light scoring on the outside housing channel because of some small burs on the outside of the ring gear. I took some 800 grit and wet sanded it with oil. The scoring and some of the burs are still there but I think I will be good. I know now whats important to check.
You are welcome! Scoring is extremely common on transmissions because of the abrasives off of the clutches. For manuals with a lubricant pump they experience the same kind of damage but from syncros and gear wear. Transmissions gears are generally tighter at .002-.004 clearance on the tooth-tooth and the width clearance is about the same.
Good thanks
What about the spring and plunger??
Any idea if the gear set being out of spec would produce intermittent oil pressure? Sometimes I have pressure on start up, sometimes it takes about 30 seconds.
Hello,Is there any performance difference between gerotor pump and crescent type internal gear pumps?And which one is more effective?
Thank you...
Do the dots on the gears have to line up on the oil pump
I'd like to ensure that the gerotor-type oil pump of my new Harley is within spec by having it inspected as there have been quality control issues. Could I take it to a good engine & machine shop for that? Should it have a minimum number of running hours on it first to allow abnormal wear patterns to appear? Thanks for your advice!
You could, alot of these techniques are feel techniques so what you get will vary based on how much you have used feeler gauges. The gears should not abnormally wear or change appreciable after you run them. So brand new or after the fact should give you the same result. The manufacturer should be able to provide the specification. In most applications between .002 and .006 on the tip to tip, Body between .002-.006, and width clearance from .002-.001 are typical.
@@thetruechaos , thanks a lot Travis. That gives me something to go on and if I don't feel confident with the feeler gauges, I'll seek somebody with experience to inspect it.
what about scratches in housing
Good question?
@@99zman Scratches come in a couple of different flavors. There are lap marks which are where very small pieces of debris that make something you can see but cannot feel, and then there are large debris marks which actually gouge the surface. If the gouge is from one side to the other, you will lose some pressure from it.
More often the issue is just wear, unseen uniform wear can build up on the oil pump housings and cause excessive clearance. Its recommended to replace the housing if it has more then 50k miles on it.
Roughly 50 microns of clearance for oil film. Is this guy measuring in inches? WTF
Factory specification for width clearance is between 25µ-100µ depending on the vehicle. This inspection process is now depreciated for us, but is still an excellent guide for people who are interested in verifying your gerotor assemblies.
Yeah,,, its more like squezing grapes then pumping oil,,,"oil pump",,,,,, oil sqeezer😛