Oil Pump Upgrade......
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,007
Likes: 7,541
From: Poolville
Oil Pump Upgrade......
A couple of weeks ago I was out for a ride with friends (11) any ways we pull into a gas station and oil is spewing out from behind the primary. With in 15 seconds it left a puddle the size of a grapefruit... So I shut it off and checked the oil tank... No reading on dipstick but can see oil in tank. So I whipped everything down bought a quart of oil started it up and it stopped... Weird I thought, so when I got it back to the shop I started to tear into it... The sprocket shaft seal was leaking. No damage to anything, crank seemed tight in the bearing as well... I didn't have any unusual motor vibrations either. So I removed the timing inspection plug and while is was turning the motor over by hand and a socket on the crank I noticed an excessive amount of oil being picked up by the crank wheels. The drilled balance holes on the wheels were full with oil.. So the only thing I could think would cause this was the pump was not scavenging or the check ball was stuck.
So I took the pump off to inspect and clean found nothing out of the ordinary... With the case full of oil there must be something going on so I decided to order a new S&S HVHP pump..
I thought that this would be an easy swap out. Man was I wrong. I never did have to mess with an oil pump before. So in the process of replacement I have learned that the only way to do it right is that I need to disassemble the entire cam chest to make sure that the pump shaft will not bind after aligning it...
So that's where I'm at for now. I'm pretty confident that it all started with a sumping issue... Time will tell...
So I took the pump off to inspect and clean found nothing out of the ordinary... With the case full of oil there must be something going on so I decided to order a new S&S HVHP pump..
I thought that this would be an easy swap out. Man was I wrong. I never did have to mess with an oil pump before. So in the process of replacement I have learned that the only way to do it right is that I need to disassemble the entire cam chest to make sure that the pump shaft will not bind after aligning it...
So that's where I'm at for now. I'm pretty confident that it all started with a sumping issue... Time will tell...
Last edited by 98hotrodfatboy; Nov 7, 2017 at 09:05 AM.
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,448
From: la la land jerzey
a seal divides the pump in and out - have seen that happen - the last one was a knucklehead with an alloy pump not the correct iron oil pump , the last install was incorrect as they influenced the drive shaft to one side of the pump and caused excessive alignment issues with the shaft / pump body and seal
it also hurt the oil pumps bushing in the block on the one I had
hold the old pump in your hand No gears just the shaft in the correct location and wiggle it back and forth as you look at the seal - now look at the seal and the amount of travel the shaft has 1/4 inch is fine more then that - is the issue its transferring the oil from the return gears back into the feed gears not going to the oil tank, and that will empty the oil tank and fill the engine
the one I had recently blew the oil tank empty in a hurry
it also hurt the oil pumps bushing in the block on the one I had
hold the old pump in your hand No gears just the shaft in the correct location and wiggle it back and forth as you look at the seal - now look at the seal and the amount of travel the shaft has 1/4 inch is fine more then that - is the issue its transferring the oil from the return gears back into the feed gears not going to the oil tank, and that will empty the oil tank and fill the engine
the one I had recently blew the oil tank empty in a hurry
Last edited by johnjzjz; Nov 7, 2017 at 06:30 PM.
Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,007
Likes: 7,541
From: Poolville
a seal divides the pump in and out - have seen that happen - the last one was a knucklehead with an alloy pump not the correct iron oil pump , the last install was incorrect as they influenced the drive shaft to one side of the pump and caused excessive alignment issues with the shaft / pump body and seal
it also hurt the oil pumps bushing in the block on the one I had
hold the old pump in your hand No gears just the shaft in the correct location and wiggle it back and forth as you look at the seal - now look at the seal and the amount of travel the shaft has 1/4 inch is fine more then that - is the issue its transferring the oil from the return gears back into the feed gears not going to the oil tank, and that will empty the oil tank and fill the engine
the one I had recently blew the oil tank empty in a hurry
it also hurt the oil pumps bushing in the block on the one I had
hold the old pump in your hand No gears just the shaft in the correct location and wiggle it back and forth as you look at the seal - now look at the seal and the amount of travel the shaft has 1/4 inch is fine more then that - is the issue its transferring the oil from the return gears back into the feed gears not going to the oil tank, and that will empty the oil tank and fill the engine
the one I had recently blew the oil tank empty in a hurry
Tourer
Joined: Apr 2017
Posts: 303
Likes: 87
From: New Galilee, Pa
The s&s hvhp pump is a nice product, and yes a pain in the *** to change. Especially if you have sausage fingers like me. Mine helped cool down and lubricate really well.
Keep you eyes open hotrod. They push so much harder that any little imperfection in your gaskets will show up. My rocker box top bolts are still weeping just a little bit. I had to go through especially the rockers and torque to make allowable on all gasket mating areas to get little weepers dried up.
Keep you eyes open hotrod. They push so much harder that any little imperfection in your gaskets will show up. My rocker box top bolts are still weeping just a little bit. I had to go through especially the rockers and torque to make allowable on all gasket mating areas to get little weepers dried up.
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Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,007
Likes: 7,541
From: Poolville
The s&s hvhp pump is a nice product, and yes a pain in the *** to change. Especially if you have sausage fingers like me. Mine helped cool down and lubricate really well.
Keep you eyes open hotrod. They push so much harder that any little imperfection in your gaskets will show up. My rocker box top bolts are still weeping just a little bit. I had to go through especially the rockers and torque to make allowable on all gasket mating areas to get little weepers dried up.
Keep you eyes open hotrod. They push so much harder that any little imperfection in your gaskets will show up. My rocker box top bolts are still weeping just a little bit. I had to go through especially the rockers and torque to make allowable on all gasket mating areas to get little weepers dried up.
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Club Member
Joined: Aug 2008
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From: Lafayette, Louisiana
S&S HVHP
that means high volume high pressure.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,007
Likes: 7,541
From: Poolville
Prot, I know what they advertise but I have heard through the grapevine (HD Forums) that because of the way the oiling system and ports are designed on our Harley's that pressure increases are not to be expected. At the pump yes but not throughout the motor... So we'll see.....