Oil check valve
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2nd Gear
Joined: Nov 2019
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From: Philly area
Oil check valve
So I just installed Andrews 57H cams in my 2015 fatboy lo. Ran it for about a minute the shut off to check the oil and a blast of air hit me. I read that the check valve us causing that. Can some1 point me to where it is?
thanks
Chris
thanks
Chris
Stellar HDF Member
Joined: Nov 2004
Posts: 3,156
Likes: 41
From: So Cal
Its located in the cam support plate
https://www.hdforums.com/forum/oil-a...ve-repair.html
https://ertproducts.com/wet-sumping
https://www.hdforums.com/forum/oil-a...ve-repair.html
https://ertproducts.com/wet-sumping
Last edited by XARAN; Jan 22, 2020 at 12:46 PM.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,158
Likes: 11,249
From: San Diego, CA
Its located in the cam support plate
https://www.hdforums.com/forum/oil-a...ve-repair.html
https://ertproducts.com/wet-sumping
https://www.hdforums.com/forum/oil-a...ve-repair.html
https://ertproducts.com/wet-sumping
I know your second link is an oil pump for a shovel head, EVO engine, not a Twin Cam... and I believe your first one is about a shovel/EVO also...
The Twin Cam has a pressure relief valve in the cam plate, but no check valve that I am aware of....... Certainly no ***** to seat, the pressure relief valve is a cylindrical style plunger... Obviously if it was missing the spring/plunger or they somehow were damaged it could cause problems... but most problems with the pressure relief valve are related to low oil pressure (by-pass opens too early)...
As I understand it, in a Twin Cam:
Oil leaks back into the sump when engine is off (some call dry sumping), due to scavenge gerotors out of tolerence, damaged scavenge gerotors, or a scored oil pump body.
They wet sump (fill the sump while running) due to a pinched or missing o-ring on the oil pump to case...
The build up of pressure in the oil tank is due to excessive blow-by by worn/unseated piston rings or the umbrella valves in the rocker arm stands are worn or backwards...
I'm always willing to learn, what am I missing.....?
Last edited by hattitude; Jan 22, 2020 at 04:52 PM.
Stellar HDF Member
Joined: Nov 2004
Posts: 3,156
Likes: 41
From: So Cal
OP has a Twin Cam...
I know your second link is an oil pump for a shovel head, EVO engine, not a Twin Cam... and I believe your first one is about a shovel/EVO also...
The Twin Cam has a pressure relief valve in the cam plate, but no check valve that I am aware of....... Certainly no ***** to seat, the pressure relief valve is a cylindrical style plunger... Obviously if it was missing the spring/plunger or they somehow were damaged it could cause problems... but most problems with the pressure relief valve are related to low oil pressure (by-pass opens too early)...
As I understand it, in a Twin Cam:
Oil leaks back into the sump when engine is off (some call dry sumping), due to scavenge gerotors out of tolerence, damaged scavenge gerotors, or a scored oil pump body.
They wet sump (fill the sump while running) due to a pinched or missing o-ring on the oil pump to case...
The build up of pressure in the oil tank is due to excessive blow-by by worn/unseated piston rings or the umbrella valves in the rocker arm stands are worn or backwards...
I'm always willing to learn, what am I missing.....?
I know your second link is an oil pump for a shovel head, EVO engine, not a Twin Cam... and I believe your first one is about a shovel/EVO also...
The Twin Cam has a pressure relief valve in the cam plate, but no check valve that I am aware of....... Certainly no ***** to seat, the pressure relief valve is a cylindrical style plunger... Obviously if it was missing the spring/plunger or they somehow were damaged it could cause problems... but most problems with the pressure relief valve are related to low oil pressure (by-pass opens too early)...
As I understand it, in a Twin Cam:
Oil leaks back into the sump when engine is off (some call dry sumping), due to scavenge gerotors out of tolerence, damaged scavenge gerotors, or a scored oil pump body.
They wet sump (fill the sump while running) due to a pinched or missing o-ring on the oil pump to case...
The build up of pressure in the oil tank is due to excessive blow-by by worn/unseated piston rings or the umbrella valves in the rocker arm stands are worn or backwards...
I'm always willing to learn, what am I missing.....?
You are right on your info, When i upgraded to the SE Hyd kit it and the OE plate have the plunger pressure relief
Thanks for catching it.
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