High compression readings

[Jarone]

howdy all

Was doing my valve adjustments and glow plugs today so while I had everything out i thought id buy a cheap compression test kit to hook up

following the service manual, the standard should be 427 psi for the QD32.
I was expecting low readings because i've been getting some oil out the dipstick but it showed about 600 on each cylinder

Could this just be a faulty gauge? It was brand new but cheap as they come

 

[doug696]

hey mate, i'm not sure about the compression but if you're getting oil out of your dipstic i would check the pcv on the tappet cover it's supposed to relieve that pressure
cheers doug

 

[jonney]

are you sure the compression is that high as in ;over 400 p.s.i. that sounds very high to me but maybe its right.

 

[Czechmate]

Wouldn't trust using cheap measurement tools on any equipment you value. they usually aren't calibrated.
Did it come with a certificate of calibration?
So many cheap imports are so far out of whack as to be useless.
Recently used a chinese tyre inflator with gauge that was 6-10 psi out, new straight out the box.

 

[Jarone]

hey mate, i'm not sure about the compression but if you're getting oil out of your dipstic i would check the pcv on the tappet cover it's supposed to relieve that pressure
cheers doug

yeah i actually replaced it when i had the rocker cover off

 

[Jarone]

Wouldn't trust using cheap measurement tools on any equipment you value. they usually aren't calibrated.
Did it come with a certificate of calibration?
So many cheap imports are so far out of whack as to be useless.
Recently used a chinese tyre inflator with gauge that was 6-10 psi out, new straight out the box.

it was this one
http://www.supercheapauto.com.au/Product/ToolPro-Compression-Tester/392376

i will see if i can borrow one off someone and retest