CaveVan Forum

VW T4 "Eurovans" => Inline 5cyl Petrol engine tech => Topic started by: Da Tow'd on May 18, 2015, 10:42:24 pm

Title: oil pressure
Post by: Da Tow'd on May 18, 2015, 10:42:24 pm

Hi Gang,
Anybody happen to know the "normal" oil pressure for the 5 cylinder engine at operating temperature?
thanks
Hank

Title: Re: oil pressure
Post by: Cole on May 19, 2015, 09:08:46 am

I'd kinda like to know this too.

I just got a 5 cyl van that has the oil light on but clearly had oil pressure. Might be nice to add a real gauge or ?

Title: Re: oil pressure
Post by: M.steward77 on May 19, 2015, 03:36:17 pm

Here is checking oil pressure on a 5cly 2.5ltr from the Bentley manual should give you a pretty good idea.

Title: Re: oil pressure
Post by: Da Tow'd on May 22, 2015, 10:52:21 am

Thanks for that Bentley write up
looks good for my engine
cheers
Hank

Title: Re: oil pressure
Post by: Cole on June 05, 2015, 11:03:41 am

Anyone have insight into a flickering/on oil pressure light.  The previous owner said its been that way for years. So clearly it has oils pressure.

Title: Re: oil pressure
Post by: greaseworks on July 11, 2015, 01:58:06 pm

The rule of thumb from the mechanic's school of wisdom is any time u have an oil warning light showing fault you must Dx the prob ASAP and the first Dx tool in this case is a good mechanical oil pressure gauge.

All VWs after some point in the late 80s have a "dynamic oil pressure monitoring sys". Basically this involves 2 oil pressure switches, one low (0.3-0.15 bar) and one "high" (1.15-1:08 bar) along with some circuitry monitoring RPMs. The principle is two fold and simple:
1) alert user when the eng has oil press below the press. of the low sensor; warning light is illuminated solid.

2) alert the user when the oil pressure at a pre set RPM (1800rpm for instance) dips below a pre determined level. Oil light flashes, and in some models an audible alarm is sounded.

This is a rough generalization from memory up through the A3 model yrs (99), and later models use a similar but more advanced system of alerting the driver.

So, that's how the system works. First step is to always check the oil pressure with a mechanical gauge
1) at idle and full operating temp FOT (87* C);
2) at FOT at idle, 1000rpm, 1500rpm, 2000rpm, etc.

Compare the results with the min OP found in the Bentley manuals.

Cold start oil pressures mean almost nothing so don't get lured into false good news by only checking that!

Ok VW mech school is jetzt geschlossen :-)

Justin


2000 EVW 5-spd TDI