Oil Pressure Gauge pipe

[Pikey]

Ive treated my Pickup to a new Oil pressure gauge pipe.
The old pipe is made of various bits, the engine end is a old steel Mini pipe then it goes to an old flexi brake pipe hose (convient sized bore) and then its got a Series 2 Landrover Copper pipe to the gauge. Well while I was under the bonnet recently I noticed that the flexi brake hose is weeping a bit of oil, So I’ve just ordered a complete new Nylon pipe with new Brass fittings on either end.

My question is I think I should take the spark plugs out anyway and crank her over until I get pressure on the gauge, but should I bleed the air in the pipe, as in, should I disconnect the gauge, crank the engine over to let out any air that’s in the pipe until I get oil out of the end and then reconnect the gauge, otherwise I’m going to have air trapped and air compressing in the pipe work and I’ll get a false reading on the gauge?

Or should I just connect up the pipe work with it empty and just start the engine and let the engine naturally fill up the new pipe work, but where does the air go with the gauge on the end of the pipe?

Regards

Steve B

[alex_holden]

Don't bother bleeding it. I tried it once to see if it made any difference to the responsiveness of the gauge, and within a few runs it had collected several air pockets again. The trapped air doesn't cause a false reading because the pressure is transferred through it. At most it might have an effect on how fast the gauge responds to changes in pressure.

[mike.perry]

With that mixture of pipes it is a wonder that they did not come apart. Remember that the pipe has to contain 60psi+ which can make an awfull mess if it breaks. Don't bother about the air bubbles, my gauges have them, if you tried cranking them out then as soon as you stopped turning the engine the oil would drop down the pipe and you would have air in the top end.

[Pikey]

Thanks guys, I'll just swop it over and start her up then.

Dont get me wrong about the bit of flexi pipe, Ive got jubilee clips on it to stop it blowing off, its just starting to weep a bit around the joints, so Ive decided to change it now to be safe rather than sorry.

I hope to fit it tonight it should only take me about 5 minutes to fit

regards

[mike.perry]

Is that a long 5 mins or a short 5 mins?

[MarkyB]

5 minute jobs sometimes take several hours more than 10 minute jobs.

[bmcecosse]

Certainly no need to do any 'bleeding' - although watch your hands on the dizzy cap clamps..........