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the check valve is in the oil pump, top side under a large flat blade screw cover. The lower of the two screw covers.
I said, lap, not tap. Some may do that, but i don't. It may not sump oil again unless it sits a long time.
I'd suggest investing in a service manual that covers the evo motor.
The check valve is in the oil pump, top side under a large flat blade screw cover. The lower of the two screw covers.
I said, LAP, not TAP. Some may do that, but I don't. It may not sump oil again unless it sits a long time.
I'd suggest investing in a service manual that covers the Evo motor.
Originally Posted by t150vej
Need photos otherwise you're only gonna get (good) suggestions on things to check that may, or may not apply. Example: check valve leakage is irrelevant if it has an oil pan rather than a tank that's above the pump level.
Without knowing some particulars, suggestions and ideas will confuse you and anyone else trying to help.
Sorry, and apologies to OhioHD. I had Road King on my brain (duh) but the photos do help. Good guess on the 90's Evo engine.
You don't have a check valve issue from what I'm reading. You have a feed / pressure problem. Could be the feed gears/drive key or could be the inner drive gear/pinion/key/shaft inside the cam chest.
Here's the sender yellow arrow. With the switch on and that wire grounded the oil light should be on. Wire off, no light.
With the engine running, wire disconnected, there should be no contact from that connection point to ground using an ohm meter.
If that checks out and the light is staying on or flickering when running, you'll need to start by draining the tank and remove the oil pump cover at the red arrow.
I'm mobile now can't do much via phone. Long shot but all considered, search online for proper oil line routing and verify they are correct. Worth a try before taking stuff apart.
You make a tool from an old pushrod with a 5/16 end and use it to lap the old by-pass seat with compound so that ball bearing seats and stops fluid bypass. Of course the pump has to come off to do it the right way.
Shovels and Evo's are notorious for the oil bypassing the check ball when they sit for a long time.
Ok thanks I'm gonna hunt down a manual and I'll keep updated .
You need a manual for the engine (year) otherwise it will not help on this. Scroll down on this page a bit and using the engine VIN, find the year of that engine before searching for a Factory Service Manual. https://www.lowbrowcustoms.com/blogs...-decoder-chart
The oil pump bolt pattern changed ever so slightly in '92, if it comes to that is why you need the year of the engine. Everything else is basically the same.
Oil line routing was a long shot but do need to verify the feed hose isn't restricted. Thing is, the return and tank vent connections are (supposed to be) well above the oil level even if it's over filled.
Here's a link to a long thread you can glance thru of a forum member with a similar issue, but with a stock bike. https://www.hdforums.com/forum/evo/1...ot-enough.html Scroll on down to posts in the 50's and you'll get closer to what you may be looking at on yours.
I doubt it's the anti sump check ball. I'd be more suspicious of that fancy cover on the pressure relief spring.. As Dan says add an oil pressure gauge.. Figure out what you got.
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