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oil pressure gauge too high

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oil pressure gauge too high

Postby Taswiz » Mon Jul 15, 2019 6:05 pm

hi
I have a 4jg2 wizard. the oil pressure gauge shot through the roof within 50m of home. saw the gauge at about 9kg/cm by the time I stoped and turned it off the gauge had maxed, with the engine off it dropped slowly, on start it came to about 8 and sits there. used to always be between 3 and 6.
anyone know what happened? did my sender just die?
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Re: oil pressure gauge too high

Postby geeves » Mon Jul 15, 2019 6:14 pm

It is possible the oil bypass is blocked but even then thats high. My money is on the sender
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby Taswiz » Tue Jul 16, 2019 8:11 am

where do I find and how do I check the oil bypass
is it ok to drive with pressure at 8-9 as I need to get to work, or should I fix it first
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Re: oil pressure gauge too high

Postby geeves » Tue Jul 16, 2019 2:25 pm

Thats the million dollar question. If it is due to a blocked bypass or even filter then there is no oil getting to the rest of the engine. If it is that high and still getting round the engine it could blow the lines off the turbo and cause seals to leak. If its the sender no problem. If it was me I would temporarily fit an aftermarket guage where the sender is and see what it thinks. Senders normally fail to zero
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby Taswiz » Wed Jul 17, 2019 1:57 pm

so I changed oil and filter, helped a bit, now idles just below 6 but goes to 8-9 when I try to drive. still not game to go anywhere.
how do I check and/or clean or replace bypass valve?
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Re: oil pressure gauge too high

Postby geeves » Wed Jul 17, 2019 2:32 pm

what oil are you using?
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby Taswiz » Thu Jul 18, 2019 12:08 pm

15 40 Castrol gtx always used this
Last edited by Taswiz on Thu Jul 18, 2019 1:21 pm, edited 1 time in total.
Taswiz
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Re: oil pressure gauge too high

Postby Taswiz » Thu Jul 18, 2019 12:48 pm

is the 22mm bolt next to the filter the bypass valve? can I take it out or will that ruin everything?
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Re: oil pressure gauge too high

Postby geeves » Thu Jul 18, 2019 2:27 pm

dont know
What happens if you turn the key on but dont start the engine? If the guage goes up the fault is electrical
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby geeves » Thu Jul 18, 2019 2:29 pm

GTX was a good oil but unless its the diesel version its not suitable for this engine. Diesel creates much more rubbish in the oil so you need an oil designed to cope with it
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby Taswiz » Thu Jul 18, 2019 2:30 pm

the guage doesn't move until it is started
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Re: oil pressure gauge too high

Postby Taswiz » Thu Jul 18, 2019 2:36 pm

doing an image search of 4jg2 filter housing shows unit has 2 bolt heads one is 22mm the other 24mm (checked by fitting socket to them) either one of them is the valve I think
hopeing it could be as simple as removing and cleaning
not sure if I should do this or not
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Re: oil pressure gauge too high

Postby Taswiz » Thu Jul 18, 2019 2:38 pm

and yes its the gtx diesel
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Re: oil pressure gauge too high

Postby Taswiz » Sat Jul 20, 2019 2:26 pm

that didn't solve the problem.
must be a blockage or restriction after the gallery in oil circuit
will try engine flush
I really don't want to have to pull engine apart
I hope no one else ever has this problem :x
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Re: oil pressure gauge too high

Postby geeves » Sat Jul 20, 2019 3:09 pm

can you get another guage sender?
even a cheap mechanical guage from the auto parts store will prove the current guage
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby Taswiz » Sat Jul 20, 2019 4:47 pm

ok will try that too
I was ruling that out coz of the 'senders normally fail to zero' comment and what a sender does, seems it could only fail to zero.
I also don't think its a faulty gauge as the engine told me there was a problem (a kind of shuttering didn't want to run)
it idles fine and revs in park but with higher than normal pressure
just when it is in gear and moves it goes haywire
Taswiz
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Re: oil pressure gauge too high

Postby geeves » Sun Jul 21, 2019 5:30 am

Check the earth strap on the engine
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: oil pressure gauge too high

Postby Taswiz » Sun Jul 21, 2019 10:07 am

that's it problem solved

thanks a million geeves your a legend

don't know why or how but I just gave the earth wire terminal connector bit a shine up and everything back to normal
glad I didn't do a flush as I read it can create more probs
thanks again
Taswiz
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Re: oil pressure gauge too high

Postby geeves » Sun Jul 21, 2019 1:34 pm

Its one of those rare faults that never makes sense.
The clue was it being worse moving. You would think that that earth would stop the engine starting but there are several places it can get an indirect earth. I read a report years ago about failing auto transmissions where the insides were showing evidence of electrolysis. They couldnt be saved. The cause bad earth strap on the engine. Wizards are all auto from factory
Sanding your knuckles before starting work can help. That way you cant skin them
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