f150 extremely High oil pressure

[fgrzanov]

Blowing oil filter seal after rebuilt. oil pressure 200 psi. crank bearing clearance is perfect. all passages clean and spotless. This is driving me crazy
Pressure regulator plunger is fine,nice and smooth.
i dont know what to do , Please help anyone

 

[boscoe]

Was the oil pump replaced as part of the rebuild?

What is a pressure regulator plunger? Does not show up in the Yamaha parts catalog or service manual.

Any idea as to what F150 model we are talking about?

 

[fgrzanov]

only replaced all oil seals in the oil pump. Not much to mess up here. 2007 F150txr . plunger is inside the oil pressure regulator. Its just spring operated plunger , part num

RELIEF VALVE ASSY​

63P-13490-00-00​

 

[boscoe]

Did the balancer ever fail and send shards of material into the block?

 

[boscoe]

Has the relief valve been replaced?

 

[boscoe]

Have you tried removing the oil pressure sensor and cranking the motor to see how much oil is flowing out? Sensor is after the main gallery which might be clogged.

 

[boscoe]

Bearings installed correctly I presume.

 

[boscoe]

Lot of work but have you tried to remove the cylinder head to crank the motor while seeing what happens with the oil pressure?

 

[boscoe]

Oil filter bracket is free and clear?

 

[boscoe]

Splattergunning you with thoughts based on my perusal of some Yamaha documents.

 

[fgrzanov]

I put the mechanical gauge in place of the oil pressure sending unit, needle pined to 200psi when started the engine .
tried the another PRV ,same thing. Bearings are good, double checked

 

[fgrzanov]

All passages are clean , spotless . use compressed are as well. no obstruction. Dont see how a bad oil pump can create 200psi

 

[fgrzanov]

Splattergunning you with thoughts based on my perusal of some Yamaha documents.

all good points , keep them coming

 

[fgrzanov]

Lot of work but have you tried to remove the cylinder head to crank the motor while seeing what happens with the oil pressure?

the head is off right now

 

[boscoe]

Are you seeing oil spray out from the ports in the block that feed the cylinder head? I would be guessing so.

If the head is removed and you are still getting that much oil pressure my guess is that it would have to be something on the crank shaft side.

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