No oil pressure
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Cruiser
Joined: May 2008
Posts: 117
Likes: 6
No oil pressure
My 1997 EVO lost oil pressure. Shut it down fast so hopefully no major damage to engine.
Pulled the oil pump and found a piece of metal had jammed the gears on the back side of the pump and sheared the key on the drive gear.
Pulled the gear cover and can not see any damage to gears, cam or lifters.
The piece of metal is about the size of a small paper clip and a 1/4 of an inch long.
The motor was running fine and not making any more noise then a normal EVO.
Any suggestion on how to track down where it came from?
Pulled the oil pump and found a piece of metal had jammed the gears on the back side of the pump and sheared the key on the drive gear.
Pulled the gear cover and can not see any damage to gears, cam or lifters.
The piece of metal is about the size of a small paper clip and a 1/4 of an inch long.
The motor was running fine and not making any more noise then a normal EVO.
Any suggestion on how to track down where it came from?
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,198
Likes: 3,087
From: NW AR
I think I would pull the timing chest open and look in there. Look particularly at the inner cam bearing. If that is all OK, then take the rocker boxes off and inspect.
What's inside the oil filter? Cut it open and see.
What's inside the oil filter? Cut it open and see.
I would inspect the cam bearing, may be a roller found it's way out. It was suggested by a member here to put a strong magnet on the cam before pulling...this may keep the rollers in the camchest area, you do not want them falling to the crank side, ask me how I know.
Seasoned HDF Member
Joined: Jan 2011
Posts: 157,459
Likes: 57,016
From: Michigan 15 Minutes East Of Hell
Yep ... I'd look there too.
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Thread Starter
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Cruiser
Joined: May 2008
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Had time today to check things out more.
Found adjustable push rods had been installed by the previous owner so made it easy to take apart.
Inner cam bearing looks good. Have not measured it but does not seem to be much, if any play in the crankshaft bearing. The cam is in good shape as are all the gear teeth.
Found the rollers on two of the lifter had about .010 of play. But even with that much play I don't see how the piece I found could have passed between the roller and the side of the lifter body (sorry no way to post a picture of the piece).
I had just changed the oil and filter. Upon draining the oil did not see a metal particles in it. Will be taking off the oil filter and mount and flush all the lines. Will cut open the filter and see if there is anything inside.
I am wondering if the metal is a piece of trash left over from when the previous owner had the solid push rods removed and put in the adjustable ones.
Found adjustable push rods had been installed by the previous owner so made it easy to take apart.
Inner cam bearing looks good. Have not measured it but does not seem to be much, if any play in the crankshaft bearing. The cam is in good shape as are all the gear teeth.
Found the rollers on two of the lifter had about .010 of play. But even with that much play I don't see how the piece I found could have passed between the roller and the side of the lifter body (sorry no way to post a picture of the piece).
I had just changed the oil and filter. Upon draining the oil did not see a metal particles in it. Will be taking off the oil filter and mount and flush all the lines. Will cut open the filter and see if there is anything inside.
I am wondering if the metal is a piece of trash left over from when the previous owner had the solid push rods removed and put in the adjustable ones.
